烧结温度对B_4C-AlSi共晶合金显微组织结构与抗压强度的影响  

Effect of Sintering Temperature on Microstructure and Compressive Strength of B4C-AlSi Eutectic Alloy

作　　者：刘锦云[1] 邹从沛[2] 查五生[1] 刘改华[1] 兰军[1] 冯权和[1] 

机构地区：[1]西华大学材料科学与工程学院,成都610039 [2]中国核动力研究设计院,成都610041

出　　处：《核动力工程》2008年第2期58-60,104,共4页Nuclear Power Engineering

摘　　要：用粉末冶金法制备了基于Al-Si共晶合金的B4C中子吸收材料芯块,研究了烧结温度对烧结坯的显微组织结构、抗压强度和塑性的影响规律及机理。结果表明,烧结温度显著影响烧结坯的性能,以550、555、560℃和565℃烧结,烧结坯分别呈现出欠烧结、最佳烧结、过烧结及熔融等不同状态。550℃烧结时,颗粒之间未发生明显的冶金结合;高于560℃烧结,芯块材料发生过烧结或熔融;555℃为最佳烧结温度,在此温度下,芯块材料发生局部熔化,颗粒彼此结合,成为较为致密的连续体,烧结坯具有良好的塑性。The block neutron absorber of B4C based on A1-Si eutectic alloy has been prepared by powder-metallurgy method. The effects of sinter temperature on microstructure, compressive strength, and ductility of sintered billets have been investigated. It has been shown that the sintering temperature decides sensi- tively the compressive strength and ductility of sintered billets. Sintered under 550, 555, 560, and 565 ℃, the billet shows different states, such as sub-sintered, best-sintered, over-sintered, and molten. Sintered under 550 ℃, the powder have not been metallurgically combined with each other. Beyond 560 ℃, the billets are molten. The 555 ℃ is the best sintering temperature, under which the powder have been partly melted and the metallurgical combination has been occurred, then the billets have a better ductility.

关 键 词：中子吸收材料 铝硅共晶合金 烧结温度 显微结构 抗压强度 

分 类 号：TG164.2[金属学及工艺—热处理]