Sintering and Gas Desorption Characteristics of Copper Ultrafine Powders

Publisher Website
Google Scholar
Abstract
The sintering and gas desorption characteristics in vacuum were examined for ultrafine powders of Oxidized Cu (subjected to slow oxidation treatment) and Fresh Cu (not subjected to slow oxidation treatment). The shrinkage of the compacts was observed at temperatures from 400 to 500 K, and it was considered to be the result of the rearrangement of ultrafine powders accompanied by the extreme desorption of H2O and CO2 gases. The specific surface areas of Oxidized powders increase and take a maximum value at approximately 420 K, which was also the temperature in the gas desorption process where the decomposition of hydroxide-like compounds take place. The expansion of compacts was observed for Oxidized powders at temperatures from 473 to 673 K, while the densification occurs for Fresh ultrafine powders at temperatures above 573 K. These different features are explained by the presence of different amounts of Cu2O in the powders. The increase of Cu2O during heating in vacuum is considered to originate from adsorbed gases and the decomposition of hydroxide-like compounds.

This publication has 12 references indexed in Scilit: