16-11-2017 дата публикации
Номер: US20170327701A1
A material and method are disclosed such that the material can be used to form functional metal pieces by producing an easily sintered layered body of dried metal paste. On a microstructural level, when dried, the metal paste creates a matrix of porous metal scaffold particles with infiltrant metal particles, which are positioned interstitially in the porous scaffold's interstitial voids. For this material to realize mechanical and processing benefits, the infiltrant particles are chosen such that they pack in the porous scaffold piece in a manner which does not significantly degrade the packing of the scaffold particles and so that they can also infiltrate the porous scaffold on heating. The method of using this paste provides a technique deposition/removal process. 1. A metal paste for use in the layerwise growth of metal structures , comprising:a vehicle comprising at least a solvent and a polymeric binder;metal scaffold particles comprising iron, the metal scaffold particles having a D50 particle size; andmetal infiltrant particles with a D50 particle sin of less than ⅕ of the D50 particle size of the metal scaffold particles, such that the metal infiltrant particles primarily position in interstitial spaces between the metal scaffold particles.2. The metal paste of claim 1 , wherein the metal scaffold particles comprise steel.3. The metal paste of claim 1 , wherein the metal scaffold particles comprise greater than 99.5 wt % iron and less than 0.5 wt % carbon.4. The metal paste of wherein the metal scaffold particles have a D50 particle size of between 1 μm and 8 μm and the metal infiltrant particles have a D50 between 50 nm and 1 μm.5. The metal paste of wherein the metal infiltrant particles comprise members selected from the group containing aluminum claim 1 , boron claim 1 , carbon claim 1 , chromium claim 1 , cobalt claim 1 , copper claim 1 , iron claim 1 , magnesium claim 1 , manganese claim 1 , molybdenum claim 1 , nickel claim 1 , phosphorus claim 1 , ...
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