微波烧结对粉末冶金铜材显微组织与性能的影响.pdfVIP

第12卷第6期 粉末冶金材料科学与工程 2007年12月 VOl_12 NO．6 Materials Science and Engineering of Powder Metallurgy Dec．2oo7 微波烧结对粉末冶金铜材显微组织与性能的影响 朱凤霞，易健宏，周承商，彭元东，李丽娅 (中南大学 粉末冶金国家重点实验室，长沙410083) 摘 要：用微波工艺烧结铜粉压坯，用排水法、布洛维硬度计、拉力试验机测量试样的相对致密度、硬度及拉伸 性能，结果表明：在30 rain内将微波烧结温度由室温升高到1 000℃再保温10 rain即可获得相对密度达92．68％的 烧结试样，其硬度和延伸率均高于相同温度下的常规烧结试样，但抗拉强度略有降低。还用扫描电镜和光学显微 镜观测、分析试样显微组织及断口形貌，结果显示：微波烧结试样的晶粒比常规烧结试样的细小且孔隙分布均匀。 关键词：微波烧结：粉末冶金：显微组织：性能 ． 中图分类号：TF 124 文献标识码：A 文章编号：1673—0224(2007)6—364—05 Influence of microwave sintering on microstructures and properties of copper powder metallurgy material ZHU Feng—xia，YI Jian-hong，ZHOU Cheng—shang，PENG Yuan—dong，LI Li—ya (State Key Laboratory ofPowder Metallurgy，Central South University,Changsha 410083，China) Abstract：Powder metallurgical copper compact sample was sintered by microwave technology,the relative density, apparent hardness and tensile strength of the samples were measured．The result indicates that through microwave processing．the temperature of the samples could reach as high as 1 000℃ in 30 rain．The sample could get a relative density of 92．68％ by holding for 1 0 min at 1 000℃．and the sample had a higher apparent hardness and elongation percentage value than those sintered by conventional fumace under the same sintering temperature，while had a slightly lower in tensile strength．The microstructure observations by both optical microscope and scanning electronic microscope (SEM)indicate that microwave sintered samples had a uniform and ultrafine porous distribution，and the average grain size was much finer than those sintered by conventional sintered ones． Key words：microwave sintering；powder metallurgy；microstructure；pro