Mo_15Cu复合材料的制备.pdfVIP

第 16 卷第 3 期 粉末冶金材料科学与工程 2011 年 6 月 Vol.16 No.3 Materials Science and Engineering of Powder Metallurgy Jun. 2011 Mo-15Cu 复合材料的制备 林俊峰，曹顺华，韩 超，王 博 ( 中南大学 粉末冶金国家重点实验室，长沙 410083) 摘 要：以 MoO3 为原料配置悬浮料浆，采用喷雾干燥－氢气还原工艺制备钼粉，并以 Mo 预烧坯为骨架，采用 熔渗法制备 Mo-15Cu 复合材料。借助 X 射线衍射和扫描电镜分别分析 Mo 粉物相组成和颗粒形貌；通过分析粉 末的压缩特性，确定预烧骨架密度变化、径向收缩率以及熔渗样理论密度变化；借助金相显微镜观察熔渗样金相 组织，借助热导仪和热膨胀分析仪测定合金的热性能。结果表明：所制备的钼粉纯度高、球形度高、压缩性好。 在压制压力720 MPa、预烧温度 1 250 ℃时，钼骨架中钼的体积分数为83.2%，Mo-15Cu 复合材料的致密度为99.6%， 热导率 153 W/(m⋅K) ，线膨胀系数为 7.0×10−6/K 。熔渗样中存在极少孔隙，钼颗粒细小，钼与铜两相分布均匀。 关键词：喷雾干燥−氢气还原法；钼粉压制性；骨架密度；Mo-15Cu ；复合材料 中图分类号：TB332 文献标识码：A 文章编号：1673-0224(2011)3-413-05 Fabrication of Mo-15Cu composite materials LIN Jun-feng, CAO Shun-hua, HAN Chao, WANG Bo (State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China) Abstract: Molybdenum powders were fabricated by MoO3 via spraying drying-hydrogen reduction method, and Mo-15Cu composite was prepared by infiltration method using Mo pre-sintered compact as skeleton, and then Mo-15Cu composite’s phase composition and particle morphology were examinated via X-ray diffraction (XRD) and scanning electron microscopy (SEM) respectively. Besides, Mo-15Cu alloys properties were studied through observing metallographic microstructure of infiltration sample, measuring the compactibility of molybdenum powders, relative density and radial dimension of Mo skeleton, and relative theoretical density of infiltration sample. The results show that as-prepared molybdenum powders have high p