Consolidation and Microstructures of Microwave Sintered W-25Cu Alloys with Fe Addition  

作　　者：罗述东 易健宏 

机构地区：[1]State Key Laboratory for Powder Metallurgy,Central South University

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2010年第3期437-443,共7页武汉理工大学学报（材料科学英文版）

基　　金：Funded by China Postdoctoral Science Foundation (No. 20060400882) ;Postdoctoral Science Foundation of Central South University

摘　　要：W-25Cu alloys were microwave sintered in a 2.45 GHz multimode applicator.The densification,microstructure and their dependence on sintering mode and Fe addition were investigated in detail.Owing to the volumetric heating intrinsic in microwave processing,a microstructure with larger W grain size in center regions was observed as against larger grain size in edge regions for conventional sintering.Microwave sintering demonstrates its intrinsic advantages such as rapid heating rate,densification enhancement and microstructural homogeneity;but it undesirably promotes W grain growth.Under microwave sintering,the role of Fe addition on compact consolidation is not so substantial as under conventional sintering.Moreover Fe degrades the microstructural quality,generating worse uniformity and coarser W grains.W-25Cu alloys were microwave sintered in a 2.45 GHz multimode applicator.The densification,microstructure and their dependence on sintering mode and Fe addition were investigated in detail.Owing to the volumetric heating intrinsic in microwave processing,a microstructure with larger W grain size in center regions was observed as against larger grain size in edge regions for conventional sintering.Microwave sintering demonstrates its intrinsic advantages such as rapid heating rate,densification enhancement and microstructural homogeneity;but it undesirably promotes W grain growth.Under microwave sintering,the role of Fe addition on compact consolidation is not so substantial as under conventional sintering.Moreover Fe degrades the microstructural quality,generating worse uniformity and coarser W grains.

关 键 词：W-Cu alloy microwave sintering CONSOLIDATION microstructure Fe addition 

分 类 号：TF124.5[冶金工程—粉末冶金]