Ni对MF/Al_2O_3复合材料力学性能的影响  

Effect of Ni on the Mechanical Properties of MF/Al_2O_3 Composites

作　　者：邢国红[1] 王志[1] 张雷[1] 丁寅森[1] 

机构地区：[1]济南大学材料科学与工程学院,山东济南250022

出　　处：《济南大学学报（自然科学版）》2010年第3期251-254,共4页Journal of University of Jinan(Science and Technology)

基　　金：山东省自然科学基金(Y2006F53);济南大学博士基金(B0514)

摘　　要：在不同烧结温度下,研究不同掺量Ni对莫来石纤维(MF)/Al2O3复合材料力学性能的影响规律,借助SEM和EDS等测试手段,分析Ni的掺入使MF/Al2O3复合材料力学性能改善的机理。结果表明,当Ni质量分数=12.5%,烧结温度为1 450℃时,Ni-MF/Al2O3复合材料抗弯强度为870.769 MPa,断裂韧性为9.51 MPa.m1/2,韦氏硬度达到11.59 GPa,相对密度为92.5%;Ni和莫来石纤维对复合材料的复合增韧效果,主要表现为金属塑性变形穿晶断裂和细化晶粒,纤维拔出、脱黏,烧结温度高时Al2O3晶粒细小,显微结构更为致密。The influence of doping amount of Ni on the mechanical properties of MF/Al2O3 composites has been studied at different sintering temperatures.The improvement of mechanical properties by doped Ni is analyzed by means of SEM and EDS.The results indicate that Ni-MF/Al2O3 composite has obtained the optimal mechanical properties when the doping amount of w（Ni） is 12.5% and sintering temperature is 1 450 ℃.Its flexural strength and fracture toughness are up to 870.769 MPa and 9.51 MPa·m1/2,respectively,Vickers hardness is 11.59 GPa,and relative density is 92.5%.The toughening effects of the composite are mainly attributed to metal plastic deformation,fine particle,and fiber extraction and stick out.The higher the sintering temperature is,the smaller the alumina grain size,and the more homogeneous the microstructure.

关 键 词：镍 MF/Al2O3复合材料 增韧 力学性能 

分 类 号：TB332[一般工业技术—材料科学与工程]