Surface Chemistry of Metal Powders and Changes during the Sintering Process
Metal powders usually bear oxygen at the surface which should be removed to enable proper formation of sintering bridges.In the present work it is shown,using ferrous PM materials as an example,that oxygen may be removed from the surface of the base ferrous powder in the early stages of sintering by reduction with carbon and/or oxygen but,depending on the alloy system chosen,may also be transferred to particles of elements with higher oxygen affinity or may even react with alloy elements contained in the ferrous particle itself,in both cases more stable oxides being formed.This means that high sintering temperatures are required to ensure complete deoxidation.Thermoanalytical techniques combined with chemical analysis are shown to be excellent tools to study these phenomena
Ferrous powders Sintering Oxygen Reduction Thermal analysis
Danninger Herbert De Oro Calderon Raquel Gierl-Mayer Christian
Institut für Chemische Technologien und Analytik,Technische Universit(a)t Wien,A-1060 Wien/Vienna,Austria
国际会议
北京
英文
92-97
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）