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The density of the consolidated material, the minimal spatial resolution as well as the surface roughness of the resulting components are complex functions of the material and process parameters.So far, the interplay between these parameters is only partially understood.the interplay between capillary effects, wetting conditions and the local stochastic powder configuration.In addition, the model takes into account the influence of the surface topology of the previous consolidated layer on the subsequent powder layer.It is very widely used in industry for tools of many types and globally ~50,000t/yr is made by PM.Other products include sintered filters, porous oil-impregnated bearings, electrical contacts and diamond tools.The formed continuous porosity is attributed to the segregation and migration of alumina particles to the spacing between the deposited successive powder layers followed by their selective melting forming oxide films that acts as a barrier to the complete solidification.Powder metallurgy (PM) is a term covering a wide range of ways in which materials or components are made from metal powders.

melting powder consolidating-8

This material is resistant to thermal shocks associated with the laser treatment. However, the window of acceptable process parameters seems to be very narrow.

The reason is a very high viscosity of fused silica, even at elevated temperatures, because powder consolidation is controlled by viscous flow.

Experimental results are analyzed with the developed mathematical model considering powder consolidation by merging softened particles.

Optional secondary processing such as coining or heat treatment often follows to obtain special properties or enhanced precision.

During powder based additive manufacturing processes, a component is realized layer upon layer by the selective melting of powder layers with a laser or an electron beam.




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