粉末熔渗制备C/C-ZrC-Cu复合材料的组织结构  

Microstructure of C/C-ZrC-Cu composite fabricated by reactive melt infiltration

作　　者：张仲灵[1] 易茂中[1] 周文艳[1] 吴皇 庞伟林 葛毅成[1] 冉丽萍[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金材料科学与工程》2016年第2期311-316,共6页Materials Science and Engineering of Powder Metallurgy

基　　金：国家重大工程相关基础研究项目(2012C20X)

摘　　要：以Cu-Zr混合粉末为熔渗剂,密度为1.4 g/cm3的多孔C/C复合材料为坯体,采用反应熔渗法制备C/C-ZrC-Cu复合材料,研究了复合材料的组织结构及物相组成,并对复合材料组织结构的形成机理进行了分析。结果表明:熔渗剂中Zr含量不同时,制备的复合材料均主要由C,ZrC和Cu相组成。随熔渗剂中Zr含量由50%增加到70%(质量分数),制备的复合材料中Cu含量逐渐降低,熔渗剂中Zr含量为60%时复合材料中ZrC含量最高(43.2%)。C/C复合坯体内的孔隙被反应生成的ZrC相及残余Cu相充分填充,炭纤维周围存在一层较致密的ZrC层,在远离炭纤维处,ZrC颗粒与Cu相呈混合分布状态。ZrC与C和Cu均有良好的界面结合状态,在ZrC颗粒长大和粗化过程中,形成了部分含内嵌Cu晶粒的较大ZrC颗粒。Using Cu-Zrpowder mixture as the infiltration agent and porous C/C composite（density：1.4 g/cm^3） as the preform, C/C-ZrC-Cu composites were fabricated by reactive melt infiltration. The microstructure and phase composition of the composites were characterized, and the formation mechanism of the microstructure was analyzed. The results show that the composites are mainly composed of C, ZrC and Cu phases despite of the variation of Zrcontent. With increasing Zrcontent in the infiltration agent from 50% to 70%, the quantity of Cu decreases. The highest content of ZrC（43.2%） is found in the composite when the content of Zris 60% in the infiltration agent. The pores in the C/C composite are fully filled with the produced ZrC and residual Cu. A dense layer of ZrC is observed around the carbon fiber. ZrC particles and Cu phases distribute homogenously in the areas away from the carbon fiber. ZrC shows good interfacial bonding with both C and Cu. In the processes of the growing and coarsening of ZrC particle, some large sized ZrC particles with Cu inclusions are formed.

关 键 词：C/C-ZrC-Cu复合材料 反应熔渗 组织 Cu-Zn混合粉末 

分 类 号：TB333[一般工业技术—材料科学与工程]