There is provided a ferromagnetic powder composition comprising soft magnetic iron based core particles (11), wherein the average size of the core particles (11) is in the range 20-1000 µm, as measured according to ISO 4497:2020, wherein the surface of the core particles (11) is at least partially coated with an at least partially covering first coating comprising at least one silicate of the general formula (M2O)a(SiO2)ß, wherein a is moles of M2O, ß is moles of SiO2, and the ß/a molar ratio is in the interval from 0.5 to 4.1, wherein the first coating (12a) is in direct contact with a surface of the core particles (11) of the ferromagnetic powder, and wherein the silicate is present in the amount of ferromagnetic powder composition comprises 0.02 to 1.0 wt% of at least one silicate calculated based on the total weight of the ferromagnetic powder composition. There is further provided a method for coating the soft-magnetic iron-based core particles and manufacturing of parts. Particularly suitable coatings were observed when M was potassium (K).
B22F 1/05 - Metallic powder characterised by the size or surface area of the particles
B22F 1/102 - Metallic powder coated with organic material
B22F 1/145 - Chemical treatment, e.g. passivation or decarburisation
B22F 1/16 - Metallic particles coated with a non-metal
C22C 33/02 - Making ferrous alloys by powder metallurgy
H01F 1/24 - Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated
H01F 1/26 - Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated by macromolecular organic substances
H01F 1/33 - Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metallic particles having oxide skin
H01F 3/08 - Cores, yokes or armatures made from powder
H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets
2.
NEW POWDER, METHOD FOR ADDITIVE MANUFACTURING OF COMPONENTS MADE FROM THE NEW POWDER AND ARTICLE MADE THEREFROM
The present invention provides an Al-based powder suitable for additive manufacture. In one embodiment the powder consists 3-5.5% by weight of Mn, 0.2-2% by weight of Zr, 0.1-1.4% by weight of Cr, 0-2% by weight of Mg, at most 0.7% of Fe and Si in total, at most 0.7% by weight of O as an inevitable impurity, and at most 0.5% other inevitable impurities, balanced with Al. The present invention also concerns an additive manufacturing method as well as an article produced by additive manufacture.
The present invention relates in one aspect to an iron-based alloy composition comprising: boron (B): 1. 6-2.4 wt. %; carbon (C): 2.2-3.0 wt.%; chromium (Cr): 3.5-5.0 wt.%; manganese (Mn): below 0.8 wt.%; molybdenum (Mo): 16.0-19.5 wt.%; nickel (Ni): 1.0-2.0 wt.%; silicon (Si): 0.2-2.0 wt.%; vanadium (V): 10.8-13.2 wt.%; and balanced with iron (Fe). In a further aspect the invention relates to an item comprising a substrate portion and a hardfacing coating bonded to the substrate portion, wherein the hardfacing coating is made by an overlay welding process using the iron-based alloy composition.
The present invention relates in one aspect to an iron-based alloy composition comprising: boron (B): 1.6-2.4 wt.%; carbon (C): 1.7-3.0 wt.%; molybdenum (Mo): 16.0-19.5 wt.%; nickel (Ni): 3.5-6.S wt.%; manganese (Mn): below 0.8 wt.%; silicon (Si): 0.2-3.0 wt.%; vanadium (V): 10.8-13.2 wt.%; and balanced with iron (Fe). In a further aspect the invention relates to an item comprising a substrate portion and a hardfacing coating bonded to the substrate portion, wherein the hardfacing coating is made by an overlay welding process using the iron-based alloy composition.
B23K 35/22 - Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
C22C 38/02 - Ferrous alloys, e.g. steel alloys containing silicon
C22C 38/08 - Ferrous alloys, e.g. steel alloys containing nickel
5.
IRON BASED ALLOY SUITABLE FOR PROVIDING A HARD AND CORROSION RESISTANT COATING ON A SUBSTRATE, ARTICLE HAVING A HARD AND CORROSION RESISTANT COATING, AND METHOD FOR ITS MANUFACTURE
An iron-based alloy that is able to provide a coating on a substrate, the coating having high hardness, corrosion resistance and bonding strength to the substrate. The iron-based alloy consists of (by weight) 16.00 -20.00 % Cr; 0.20 -2.00 % B; 0.20 -4.00 %Ni; 0.10 -0.35 % C; 0.10 -4.00 %Mo; optionally 1.50 % or less Si, 1.00 % or less Mn, 3.90 % or less Nb, 3.90 % or less V,3.90 % or less W and 3.90 % or less Ti; the balance being Fe and unavoidable impurities; with the proviso that the total amount of Mo, Nb, V, W and Ti is in the range of 0.1 -4.0 % by weight of the alloy. It further relates to an article comprising a substrate and coating formed thereon, the coating being formed from the alloy, and to a method for forming a coated article. The method preferably employs HVOF, HVAF, cold spraying, plasma spraying, laser cladding or plasma transferred arc cladding.
C22C 38/54 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
C23C 24/10 - Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
6.
IRON BASED ALLOY SUITABLE FOR PROVIDING A HARD AND WEAR RESISTANT COATING ON A SUBSTRATE, ARTICLE HAVING A HARD AND WEAR RESISTANT COATING, AND METHOD FOR ITS MANUFACTURE
An iron-based alloy consists of 3.0-7.0% by weight Cr; 1.3-3.0% by weight C; 0.2-2.0% by weight B; 2.0-10.0% by weight V; optionally 1.5% by weight or less Si; optionally 1.0% by weight or less Mn; optionally 2.0% by weight or less Mo; optionally 1.5% by weight or less Ni; the balance being Fe and unavoidable impurities. The iron-based alloy is able to provide a coating on a substrate. The coating has simultaneously high hardness and wear resistance. An article comprises a substrate and coating which being formed from the alloy. A method for forming a coated article preferably employs HVOF, laser cladding or plasma cladding.
Embodiments of the present invention may provide a new stainless steel powder suitable for manufacturing of duplex sintered stainless steels. Embodiments of the present invention may also relate to a method for producing the stainless steel powder, the duplex sintered stainless steel as well as methods for producing the duplex sintered stainless steel.
B22F 1/00 - Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
B22F 9/08 - Making metallic powder or suspensions thereof; Apparatus or devices specially adapted therefor using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
C22C 33/02 - Making ferrous alloys by powder metallurgy
C22C 38/02 - Ferrous alloys, e.g. steel alloys containing silicon
C22C 38/44 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
8.
FEEDSTOCK FOR AN ADDITIVE MANUFACTURING METHOD, ADDITIVE MANUFACTURING METHOD USING THE SAME, AND ARTICLE OBTAINED THEREFROM
The present invention relates to an improved feedstock for a 3D manufacturing process, in particular a Fused Filament Fabrication process. The feedstock comprises (P) sinterable particles made of a metal, metal alloy, glass, ceramic material, or a mixture thereof; and (B)a binder composition comprising (b1) 5 15 % by weight, relative to the total weight of the binder composition, of a polymeric compatibilizer, and (b2) 85 95 % by weight, relative to the total weight of the binder composition, of a polymeric binder component, the polymeric binder component being selected from the group consisting of (b2-1) a polymer mixture or polymer alloy, the mixture or alloy comprising at least a first and a second polymer, the Tg of the first polymer being -20 °C or lower and the Tg of the second polymer being 60 °C or higher; (b2-2)one, two or more block copolymers, comprising at least a first polymer block and second polymer block, the first polymer block having a Tg in the range of -20 °C or lower and the second polymer block having a Tg of 60 °C or higher; and25 (b2-3) mixtures of (b2-1) and (b2-2); wherein the amount of sinterable particles (P) is 40 Vol.-% or more of the composition.
B29C 64/153 - Processes of additive manufacturing using only solid materials using layers of powder being selectively joined, e.g. by selective laser sintering or melting
B33Y 70/10 - Composites of different types of material, e.g. mixtures of ceramics and polymers or mixtures of metals and biomaterials
A filtering medium for removing the content of contaminants in fluids, wherein said filtering medium includes an acid-washed iron-based powder, wherein the acid-washed iron-based powder is formed by washing an iron-based powder in HCl, wherein the BET surface area of the acid-washed iron-based powder is at least 1.2 m2/g, wherein the acid- washed iron-based powder has a Fe content of at least 90% by weight. And, a method for reducing the content of contaminants in fluids including the steps of: a) providing the filtering medium, b) bringing one or more contaminated fluid(s) in contact with the filtering medium to reduce the content of contaminants in said one or more fluid(s), c) optionally removing the filtering medium from the one or more fluid(s) with a reduced content of contaminants.
C02F 1/28 - Treatment of water, waste water, or sewage by sorption
B01J 20/02 - Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
B01J 20/28 - Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
B01J 20/30 - Processes for preparing, regenerating or reactivating
C02F 1/66 - Treatment of water, waste water, or sewage pH adjustment
A device for electrocoagulation to treat a process stream, such as water, wastewater, or industrial waste. Also, a method to treat a process stream, such as water or wastewater, or industrial waste, utilizing said device. An electrocoagulation device configured to treat a process stream, the device including a cathode; an anode, wherein the anode is porous and water permeable and made of a compacted powder comprising iron and having a porosity between 11 and 62% by volume; and a pressure system, wherein the pressure system is configured to flow the process stream through the anode, such that a pressure differential across the anode is at least 6.9 kPa (1 psi).
The invention relates to powder metallurgy, in particular production of tungsten monocarbide spherical powders, which is a major component of metalloceramic hard alloys used for manufacture of tools, drill bits, steel alloying, wear- resistant coating cladding at elements operating in intensive wear conditions. The method includes melting of the starting material, and melt atomization with forming of spherical powder. As starting material a tungsten monocarbide grit is used. Melting and atomization of the material is implemented by continuous filling of grit into a rotating crucible of a centrifugal atomization device under an inert atmosphere and melting it by a plasma arc. After that an annealing of the obtained powder is made at a temperature of 1200-1400°C during a time necessary for W2C breakup with subsequent cooling of the powder in a furnace. The invention is directed to production of tungsten monocarbide spherical powder with WC content of more than 70 %.
Disclosed is a new diffusion-bonded powder consisting of an iron powder having 1-5%, preferably 1.5-4% and most preferably 1.5-3.5% by weight of copper particles diffusion bonded to the surfaces of the iron powder particles. The new diffusion bonded powder is suitable for producing components having high sintered density and minimum variation in copper content.
The present invention concerns an iron-based powder composition comprising, in addition to an iron-based powder, a minor amount of a machinability enhancing additive, said additive comprising at least halloysite. The invention further concerns the use of the machinability enhancing additive and a method for producing an iron-based sintered component for easy machining.
The invention discloses a nickel based brazing filler metal in form of an alloy containing or consisting of between 20wt% and 35wt% chromium, between 7wt% and 15wt% iron and between 2.5wt% and 9wt% silicon, between 0wt% and 15wt% molybdenum, unavoidable impurities and the balance being nickel. The solidus temperature of the brazing filler shall be between 1140°C and 1240°C. The brazing filler metal is suitable for production of catalytic converters and heat exchangers. The invention also discloses a brazing method.
The present invention concerns an iron-based powder composition comprising at least an iron-based powder, and a minor amount of a machinability enhancing additive, said additive comprising at least one titanate compound. The invention further concerns the use of the machinability enhancing additive and a method for producing an iron-based sintered component for easy machining.
The present invention relates to a metal powder composition for making compacted parts, the metal powder composition comprising (i) sponge iron particles or sponge iron-based particles, and (ii) a lubricant comprising at least two different fatty acid amides.
The present invention relates to an electrochemical cell containing a sacrificial electrode suitable for electrocoagulation as well as an electrocoagulation process for removing various pollutants from water or wastewater by the use of the electrochemical cell. The present invention also concerns the sacrificial electrode per se. Several electrochemical cells according to the invention can be coupled to an electrochemical cell assembly. Certain aspects and embodiments of the invention are especially suitable for reduction of fluoride or fluoride in combination with heavy metals such as hexavalent chromium or arsenic.
There is provided a powder mixture consisting of an iron based powder A and an iron based powder B in a ratio from 90:10 to 50:50, wherein the powder A contains 1.5-2.3 wt% pre-alloyed Cr, 0-0.3 wt% pre-alloyed Mo, and inevitable impurities, the balance being Fe; and the powder B contains 2.4-3.6 wt% pre alloyed Cr, 0.30- 0.70 wt% pre-alloyed Mo and inevitable impurities, the balance being Fe; 0.4-0.9 wt% carbon; 0.1-1.2 wt% lubricant; solid lubricant in an amount of 0.1- 1.5 wt%; and inevitable impurities. There is also provided a method of manufacturing a sintered component and a sintered component manufactured using such methods. The powdered mixture may be used to manufacture components which exhibit high strength and high wear resistance, while possessing reasonable ductility.
There is provided a composite iron-based powder composition comprising core particles, wherein the core particles are a mixture of (a) iron alloy particles consisting essentially of 7% to 13% by weight silicon, 4% to 7% by weight aluminium, the balance being iron, and (b) atomized iron particles, wherein said core particles are coated with a first phosphorous containing layer, and wherein the atomized iron particles have a second layer comprising: (i) an alkaline silicate combined with a clay mineral containing a phyllosilicate, the combined silicon-oxygen tetrahedral layer and hydroxide octahedral layers thereof being electrical neutral, or (ii) a metal organic layer. There is also provided a method for producing a compacted and heat treated component using the composite iron-based powder composition described above.
H01F 1/24 - Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated
H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets
An iron-based powder composition for metal injection molding having an average particle size of 20-60µm, and having 99% of the particles less than 120 µm wherein the iron- based powder composition comprises by weight percent of the iron- based powder composition; Mo: 0.3-1.6 P: 0.1 - 0.6, Optionally max 3.0 Cu, Optionally max 0.6 Si, Optionally max 5 Cr, max 1.0 of unavoidable impurities, whereof carbon is less than 0.1, the balance being iron, and wherein the sum of Mo and 8*P content is within the range of 2-4.7.
The present invention concerns a composite iron-based powder suitable for soft magnetic applications such as inductor cores. The composite iron-based powder comprises core particles coated with a first phosphorous containing layer and a second layer containing an alkaline silicate combined with a clay mineral containing a phyllosilicate having combined silicon-oxygen tetrahedral and hydroxide octahedral layers that are electrically neutral. The present invention also concerns a method for producing a soft magnetic component and the component produced by the method.
B22F 3/16 - Both compacting and sintering in successive or repeated steps
H01F 1/24 - Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated
H01F 3/08 - Cores, yokes or armatures made from powder
H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets
The present invention concerns a filtering medium, a method for the production thereof, the use of said filtering medium and a method for reducing the content of multiple contaminants simultaneously in fluids by means of said filtering medium through a physical barrier, a chemical process or biological process, wherein said filtering medium consists of or comprises at least one of the following: a mixture (A) containing a major part of an iron-based powder and a minor part of a copper based powder, an iron-copper powder alloy (B), and an iron-based porous and permeable composite containing copper (C).
B01J 20/02 - Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
B01D 53/02 - Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases or aerosols by adsorption, e.g. preparative gas chromatography
B01J 20/30 - Processes for preparing, regenerating or reactivating
The present invention concerns a filtering medium, a method for the production thereof, the use of said filtering medium and a method for reducing the content of multiple contaminants simultaneously in fluids by means of said filtering medium through a physical barrier, a chemical process or biological process, wherein said filtering medium consists of or comprises at least one of the following: a mixture (A) containing a major part of an iron-based powder and a minor part of a copper based powder, an iron-copper powder alloy (B), and an iron-based porous and permeable composite containing copper (C).
B01D 39/06 - Inorganic material, e.g. asbestos fibres, glass beads or fibres
B01D 15/00 - Separating processes involving the treatment of liquids with solid sorbents; Apparatus therefor
B01D 24/12 - Downward filtration, the filtering material being supported by pervious surfaces
B01J 20/02 - Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
C02F 1/28 - Treatment of water, waste water, or sewage by sorption
C02F 1/50 - Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
A spherical tungsten carbide powder is characterized by that the material has a microhardness higher than 3600 kgf/mm2, and that the powder has an apparent density from 9.80 to 11.56 g/cm3. A method for the manufacture of a powder comprises the steps: a) providing a chamber comprising a rotatable crucible, b) adding material into said rotatable crucible, c) melting the material using a plasma arc discharge, d) rotating the crucible to atomize the molten material to form liquid droplets, with subsequent cooling of the droplets to obtain a powder, wherein the material added into said rotatable crucible is heated to a temperature above 40% of the melting temperature of the material before it enters the crucible. It is possible to reduce the current required for melting the stock. Heat losses are decreased, and the spherical powder obtained during atomization becomes more homogeneous in its composition and structure. The cost is reduced.
B01J 2/14 - Processes or devices for granulating materials, in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic in rotating dishes or pans
B22F 9/00 - Making metallic powder or suspensions thereof; Apparatus or devices specially adapted therefor
C22C 29/08 - Alloys based on carbides, oxides, borides, nitrides or silicides, e.g. cermets, or other metal compounds, e. g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds based on tungsten carbide
A spherical tungsten carbide powder is characterized by that the material has a microhardness higher than 3600 kgf/mm2, and that the powder has an apparent density from 9.80 to 11.56 g/cm3. A method for the manufacture of a powder comprises the steps: a) providing a chamber comprising a rotatable crucible, b) adding material into said rotatable crucible, c) melting the material using a plasma arc discharge, d) rotating the crucible to atomize the molten material to form liquid droplets, with subsequent cooling of the droplets to obtain a powder, wherein the material added into said rotatable crucible is heated to a temperature above 40% of the melting temperature of the material before it enters the crucible. It is possible to reduce the current required for melting the stock. Heat losses are decreased, and the spherical powder obtained during atomization becomes more homogeneous in its composition and structure. The cost is reduced.
B22F 9/10 - Making metallic powder or suspensions thereof; Apparatus or devices specially adapted therefor using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying using centrifugal force
This invention relates to a brazing filler metal with excellent wetting behaviour on stainless steel base material. The brazing filler metal produces a brazed joint with high strength and good corrosion resistance. The brazing filler metal is suitable for brazing stainless steel and other materials where corrosion resistance and high strength is required. Typical examples of applications are heat exchangers and catalytic converters. The iron-chromium based brazing filler metal powder according to the invention comprises: between 11 and 35wt% Chromium, between 0 and 30wt% Nickel, between 2 and 20wt% Copper, between 2 and 10wt% Silicon, between 4 and 10wt% Phosphorous, between 0- 10wt% Manganese, and at least 20 wt% iron and if Si is equal to or less than 6wt% then P should be above 8 wt% and if P is less or equal to 8wt% then Si should be above 6wt%.
B23K 35/22 - Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
B23K 35/02 - Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
B23K 35/30 - Selection of soldering or welding materials proper with the principal constituent melting at less than 1550°C
C22C 33/02 - Making ferrous alloys by powder metallurgy
C22C 38/20 - Ferrous alloys, e.g. steel alloys containing chromium with copper
C22C 38/34 - Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
C22C 38/38 - Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
C22C 38/42 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
C22C 38/58 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
27.
PERMEABLE POROUS IRON COMPOSITES COMPRISING IRON PARTICLES AND FUNCTIONAL INGREDIENTS AND THEIR USE IN THE TREATMENT OF CONTAMINATED FLUIDS
The present invention relates to a porous and permeable composite for treatment of contaminated fluids characterized in that said composite comprises a body of iron particles and 0.01-10% by weight of at least one functional ingredient distributed and locked in the pores and cavities of the iron body. The present invention also relates to methods of making a permeable porous composite for water treatment. The present invention also relates to use of a permeable porous composite according to any preceding claims for reducing the content of contaminants in a fluid, wherein said fluid is allowed to pass through the permeable composite.
B22F 9/04 - Making metallic powder or suspensions thereof; Apparatus or devices specially adapted therefor using physical processes starting from solid material, e.g. by crushing, grinding or milling
C02F 1/58 - Treatment of water, waste water, or sewage by removing specified dissolved compounds
The present invention concerns an iron-based powder composition comprising, in addition to an iron-based powder, a minor amount of a machinability improving additive, said additive comprising at least one silicate selected from the group consisting of bentonites and muscovite. The invention further concerns the use of the machinability improving additive and a method for producing an iron-based sintered part having improved machinability.
The present invention concerns an iron-based powder metallurgical composition comprising an iron or iron- based powder and a particulate composite lubricant, said composite lubricant comprising particles having a core comprising a solid organic lubricant having fine carbon particles adhered thereon. The invention further relates to the particulate composite lubricant and a method for producing the same.
B22C 1/00 - Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
C10M 177/00 - Special methods of preparation of lubricating compositions; Chemical modification by after-treatment of components or of the whole of a lubricating composition, not covered by other classes
C22C 33/02 - Making ferrous alloys by powder metallurgy
30.
POWDER METAL COMPOSITION COMPRISING SECONDARY AMIDES AS LUBRICANT AND/OR BINDER
The invention concerns a powder metal composition comprising an iron based powder and a lubricant and/or binder comprising at least one secondary amide of the general formula: R1-NH-CO-R2, wherein R1 and R2 are the same or different, straight or branched, saturated or unsaturated aliphatic hydrocarbon groups . The invention further concerns a method of making green bodies of the powder metal composition according to the invention, a method of producing a bonded iron-based powder composition, as well as the use of the at least one secondary amide as a lubricating and/or binding agent for iron based powders and the use as a die wall lubricant.
The invention concerns an improved segregation-resistant and dust-resistant metallurgical composition for making compacted parts, comprising at least about 80 percent by weight of an iron or iron-based powder; at least one alloying powder; and (c) about 0.05 to about 2 percent by weight of a binding/lubricating combination of polyethylene wax and ethylene bis- stearamide, the polyethylene wax having a weight average molecular weight below about 1000 and a melting point below that of ethylene bisstearamide, and being present in amount between 10 and 90% by weight of the binding/lubricating combination.
patents
