Metallic Powder Mixtures

Abstract

The invention relates to blends of metal, alloy or composite powders having a maximum mean particle diameter D50 of 75, preferably a maximum of 25 μm, which are produced according to a process in which a base powder is first transformed into flake-like particles and these are then crushed in the presence of milling auxiliary agents, with further additives and also the use of these powder blends and moulded objects produced from them.

1 - 18 . (canceled) 
   
   
       19 . A metallic powder blend comprising
 a Component I, which comprises a metal, alloy and composite powder having a mean particle diameter D50 of no more than 75 μm, measured with a Microtrac® X100 particle size analyzer according to ASTM C 1070-01, obtainable by a process, wherein the particles of a base powder with a larger or smaller mean particle size are processed in a deformation step into flake-like particles, whose ratio of particle diameter to particle thickness is 110:1 to 10000:1 and these flake-like particles are subjected in a further process step to pulverization in the presence of a milling auxiliary agent,   optionally a Component II, which is a metal powder (MLV) for powder metallurgy applications and   optionally a Component II, which is a functional additive.   
   
   
       20 . A metallic powder blend comprising
 a Component I, which comprises a metal, alloy and composite powder, of which the contraction, measured with a dilatometer according to DIN 51045-1, up to the point at which the temperature of the first contraction maximum is reached, is at least 1.05 times the contraction of a metal, alloy or composite powder of the same chemical composition and the same mean particle diameter D50 produced by atomization, wherein the powder to be analyzed is compacted before measuring contraction to a pressed density of 50% of theoretical density,   optionally a Component II, which is a metal powder (MLV) for powder metallurgy applications and   optionally a Component III, which is a functional additive.   
   
   
       21 . The metallic powder blend according to  claim 19 , wherein Component I or II, independently of each other, are the same or different and have a composition of Formula (I)
   hA-iB-jC-kD  (I)   
     wherein,
 A stands for one or more of the elements Fe, Co or Ni, 
 B stands for one or more of the elements V, Nb, Ta, Cr, Mo, W, Mn, Re, Ti, Si, Ge, Be, Au, Ag, Ru, Rh, Pd, Os, Ir or Pt, 
 C stands for one or more of the elements Mg, Al, Sn, Cu, or Zn, and 
 D stands for one or more of the elements Zr, Hf, Mg, Ca, or rare earth metal, 
 and h, i, j and k give the proportions by weight, wherein 
 h, i, j and k, independently of each other, each mean 0 to 100 wt. % 
 provided that the total of h, i, j and k amounts to 100 wt. %. 
 
   
   
       22 . The metallic powder blend according to  claim 20 , wherein Component I or II, independently of each other, are the same or different and have a composition of Formula (I)
   hA-iB-jC-kD  (I)   
     wherein,
 A stands for one or more of the elements Fe, Co or Ni, 
 B stands for one or more of the elements V, Nb, Ta, Cr, Mo, W, Mn, Re, Ti, Si, Ge, Be, Au, Ag, Ru, Rh, Pd, Os, Ir or Pt, 
 C stands for one or more of the elements Mg, Al, Sn, Cu, or Zn, and 
 D stands for one or more of the elements Zr, Hf, Mg, Ca, or rare earth metal, 
 and h, i, j and k give the proportions by weight, wherein 
 h, i, j and k, independently of each other, each mean 0 to 100 wt. % 
 provided that the total of h, i, j and k amounts to 100 wt. %. 
 
   
   
       23 . The metallic powder blend according to  claim 21 , wherein
 B stands for one or more of the elements V, Cr, Mo, W or Ti,   C stands for one or more of the elements Mg or Al and   D stands for one or more of the elements Zr, Hf, Y or La.   
   
   
       24 . The metallic powder blend according to  claim 23 , wherein said composite powder having a mean particle diameter D 50 of no more than 25 μm,
 h stands for 50 to 80 wt. %   i stands for 15 to 40 wt. %   j stands for 0 to 15 wt. % and   k stands for 0 to 5 wt. %   provided that the total of h, i, j and k amounts to 100 wt. %.   
   
   
       25 . The metallic powder blend according to  claim 22 , wherein
 B stands for one or more of the elements V, Cr, Mo, W or Ti,   C stands for one or more of the elements Mg or Al and   D stands for one or more of the elements Zr, Hf, Y or La.   
   
   
       26 . The metallic powder blend according to  claim 25 , wherein
 h stands for 50 to 80 wt. %   i stands for 15 to 40 wt. %   j stands for 0 to 15 wt. %   k stands for 0 to 5 wt. %   provided that the total of h, i, j and k amounts to 100 wt. %.   
   
   
       27 . The metallic powder blend according to  claim 20 , wherein Component I and/or II is an alloy selected from the group consisting of Fe20Cr10Al0.3Y, Fe22Cr7V0.3Y, Ni117Mo15Cr6Fe5W1Co, FeCrVY, Ni20Cr16Cu2.5Ti1.5Al, Ni53Cr20Co18Ti2.5Al1.5Fe1.5 and Ni57Mo17Cr16FeWMn. 
   
   
       28 . The metallic powder blend according to  claim 20  which further comprises a processing auxiliary agent or a pressing auxiliary agent. 
   
   
       29 . The metallic powder blend according to  claim 19 , which is a blend of Components I and II. 
   
   
       30 . The metallic powder blend according to  claim 19 , which is a blend of Components I and III. 
   
   
       31 . The metallic powder blend according to  claim 19 , which is a blend of components I, II and III. 
   
   
       32 . The metallic powder blend according to  claim 20 , which is a blend of Components I and II. 
   
   
       33 . The metallic powder blend according to  claim 20 , which is a blend of Components I and III. 
   
   
       34 . The metallic powder blend according to  claim 20 , which is a blend of components I, II and III. 
   
   
       35 . The metallic powder blend according to  claim 20 , which contains as Component III a hard material, a slip agent or an intermetallic compound. 
   
   
       36 . The metallic powder blend according to  claim 20 , wherein Component III comprises carbides,
 borides,   nitrides,   oxides,   silicides,   hydrides,   diamonds, or   sulfides.   
   
   
       37 . The metallic powder blend according to  claim 20 , wherein Component III comprises
 carbides of the elements of groups 4, 5 and 6 of the periodic system,   borides of the elements of groups 4, 5 and 6 of the periodic system,   nitrides of the elements of groups 4, 5 and 6 of the periodic system,   oxides of the elements of groups 4, 5 and 6 of the periodic system,   oxides of aluminium and rare earth metals;   silicides of aluminium,   silicides of boron,   silicides of cobalt,   silicides of nickel,   silicides of iron,   silicides of manganese,   silicides of molybdenum,   silicides of tungsten,   silicides of zirconium,   hydrides of tantalum,   hydrides of niobium,   hydrides of titanium,   hydrides of magnesium,   hydrides of tungsten,   graphite,   oxides,   molybdenum sulfide,   zinc sulfide,   tin sulfide (SnS, SnS 2 ),   copper sulfide;   boron nitride,   titanium boride or   intermetallic compounds with particular magnetic or electrical properties on a rare earth-cobalt or rare earth-iron base.   
   
   
       38 . The metallic powder blend according to  claim 19 , wherein Component III comprises long-chain hydrocarbons, waxes, paraffins, plastics, fully-degradable hydrides, refractory metal oxides, organic or inorganic salts or mixtures thereof. 
   
   
       39 . The metallic powder blend according to  claim 20 , wherein Component III comprises low-molecular polyethylene or polypropylene, polyurethanes, polyacetal, polyacrylates, polystyrene, rhenium oxide, molybdenum oxide, titanium hydride, magnesium hydride or tantalum hydride. 
   
   
       40 . A process for the production of a molded object, which comprises subjecting a metallic powder blend according to  claim 20  to a powder-metallurgic molding process. 
   
   
       41 . The process according to  claim 40 , wherein the powder-metallurgic molding process is selected from the group consisting of pressing, sintering, slip casting, sheet casting, wet-spraying, powder rolling (both hot, cold or warm powder rolling), hot pressing, and hot isostatic pressing (HIP), sinter-HIP, sintering of powder charges, cold isostatic pressing (CIP), green processing, thermal spraying and deposition welding. 
   
   
       42 . A molded object obtainable by a process according to  claim 41 . 
   
   
       43 . A molded object containing the metallic powder blend according to  claim 20 .