烧结工艺对SiC/Cu–Al复合材料的力学性能及断裂行为的影响  

EFFECTS OF SINTERING PROCESS ON MECHANICAL PROPERTIES AND FRACTURE BEHAVIOR OF SiC/Cu-Al COMPOSITES

作　　者：王海龙[1] 张锐[2] 刘锁兵[2] 辛玲[2] 黎寿山[2] 许红亮[2] 卢红霞[1] 胡行[1] 

机构地区：[1]郑州大学教育部材料物理重点实验室 [2]郑州大学材料科学与工程学院,郑州450000

出　　处：《硅酸盐学报》2006年第11期1315-1320,共6页Journal of The Chinese Ceramic Society

基　　金：河南省杰出青年基金(512002200)资助项目。

摘　　要：以Cu包裹SiC颗粒为增强体,分别采用真空热压烧结和常压氩气气氛保护烧结方式制备含5%(体积分数)SiC颗粒的SiC/Cu–Al复合材料。研究了不同烧结温度对样品密度、Vickers硬度和弯曲强度的影响。采用X射线衍射、扫描电镜对样品的晶相组成和结构进行了测定。结果表明热压制品相对常压烧结制品的晶相组织均匀,晶粒细小。热压烧结可以大大提高SiC/Cu–Al复合材料的致密度,最高达到理论密度的99.9%。热压烧结的制品的硬度得到提高,550℃热压烧结的制品硬度最高可达到65MPa,575℃烧结时,其最大抗弯强度为190MPa,断裂机制主要是增强的颗粒断裂和基体撕裂。SiC/Cu-Al composites with 5% （volume fraction） SiC particles were prepared by hot-pressing and conventional pressureless sintering in argon atmosphere and using Cu particles coated with SiC （SiC/Cu） as reinforced matrix. The effects of temperature on the density, hardness, strength, and microstructure of the composites were investigated. The phase composition and microstructure of the composites were analyzed and characterized by X-ray diffraction and electron scanning microscopy. The results show that the structure of the composites prepared by hot-pressing is homogenous, and the grain size is smaller than that of composites prepared by conventional pressureless sintefing. The density of SiC/Cu-Al composites prepared by hot pressing can be improved and reach 99.9% of theoretical density. The Vickers hardness of the composites prepared by hot-pressing increases to 65 MPa at 550℃. The maximum strength of the composites prepared hot-pressing is 190 MPa at 575℃. The failure mechanisms are particle fracture and matrix dilaceration.

关 键 词：热压烧结 铝基复合材料 颗粒增强 断裂机制 

分 类 号：TB333[一般工业技术—材料科学与工程]