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OALib Journal期刊
ISSN: 2333-9721
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超细mo--30cu复合粉末的烧结行为
Keywords: 金属材料,mo--cu,超细粉末,烧结行为,力学性能,显微组织
Abstract:
？采用溶胶--喷雾干燥--煅烧--氢还原方法制备了晶粒尺寸为17--30nm的超细mo--30cu复合粉末,在制备过程中经历了一系列的相转变,？由喷雾干燥复合盐前驱体cu7.6o8(no3)+(nh4)2(mo4o13)+(nh4)6(mo7o24)(h2o)4+cu4mo5o17+cumoo4在450℃煅烧后转变为cumoo4+moo3复合氧化物,在300℃低温还原转变为moo2+cu2o+cu三相,再在700℃高温还原完全转变为mo+cu两相复合粉末.该粉末在1050--1200℃烧结时从亚稳态mo(cu)固溶体逐渐转变为mo和cu相,在1050℃烧结后得到致密度为99.7\%的细晶合金.合金的最大抗拉强度可达755mpa,最大延伸率可达15.8%.
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