LCAS SiC_w ZrO_2复合材料的力学性能及其微观结构  

MECHANICAL PROPERTIES AND MICROSTRUCTURE OF LCAS SiC w ZrO 2 COMPOSITE

作　　者：涂国辉[1] 孙孝华[1] 李章大[2] 周秋兰[2] 

机构地区：[1]中南工业大学材料科学与工程系,长沙410083 [2]中国地质科学院,北京100037

出　　处：《中南工业大学学报》1999年第5期515-518,共4页Journal of Central South University of Technology(Natural Science)

基　　金：国家有色金属工业局计划基金

摘　　要：研究了ＬＣＡＳＳｉＣｗＺｒＯ２ 复合材料的力学性能及其微观结构．力学性能分析表明：ＳｉＣｗ 增韧和ＺｒＯ２ 相变增韧的加和性不是简单地叠加，ＳｉＣｗ 增韧提高了ＺｒＯ２ 相变增韧效果．体积分数分别为５５ ％ ，３０％ ，１５％ 的ＬＣＡＳ，ＳｉＣｗ ，ＺｒＯ２ 复合材料的断裂韧性Ｋ１Ｃ和抗弯强度σｂ 达到６－４ ＭＰａ·ｍ１／２ 和３３１－７ ＭＰａ．透射电镜（ＴＥＭ） 图象表明：复合材料中ＺｒＯ２ 起了应力诱导相变增韧作用；ＬＣＡＳ／ＳｉＣｗ 界面较清晰，其宽度约１５ ｎｍ ；搭在ＬＣＡＳ／ＳｉＣｗ 界面两侧的杆状ＴｉＣThe mechanical properties and microstructure of SiC w reinforced and ZrO 2 toughened LCAS matrix composites were studied. The analysis of mechanical properties of composites shows that the combined toughness increment introduced by the use of SiC w and ZrO 2 is greater than the sum of the individual toughness increments. The prepared composite (volume fractions of LCAS, SiC w, ZrO 2 are 55%, 30%, 15% respectively) has high toughness (6.4 MPa·m 1/2 ) and fracture strength (331.7 MPa). The TEM analysis of the composites shows that there is ZrO 2 phase transformation toughening in the composites; the interfacial layer between SiC w and LCAS matrix is alout 15 nm thick; the TiC particles precipitating in the interfacial region has resulted in high interfacial bond strength.

关 键 词：微观结构 复合材料 力学性能 LCAS-SiCw-ZrO2 

分 类 号：TG148[一般工业技术—材料科学与工程] TB301[金属学及工艺—金属材料]