MODIFICATION OF PARTICLE CONTACT REGION IN A PERMEABLE COPPER BASE ALLOY BY VARIATION OF PROCESSING VARIABLES

摘要

Porous materials with a defined amount of porosity were produced by HIPing various fractions of spherical particles. The densification was carried out with or without the presence of a liquid phase depending on the selected processing variables. The materials obtained exhibited varying particle contact geometry and chemistry corresponding to the dominant acting sintering mechanisms. Therefore the mechanical properties of the materials are quite different in spite of the same porosity. It was possible to combine strength and ductility with open porosity in an advantageous manner by controlling the processing variables. The material produced is well suited for applications where high thermal conductivity, permeability and good mechanical properties at elevated temperatures are required.