LCAS微晶玻璃的SiC_w·ZrO_2增韧研究  

STUDY ON WHISKER REINFORCEMENT AND ZIRCONIA TOUGHENING OF LCAS GLASS-CERAMICS

作　　者：涂国辉[1] 孙孝华[1] 王开志 刘良先[1] 曹显良[1] 

机构地区：[1]中南工业大学材料科学与工程系,长沙410083

出　　处：《粉末冶金材料科学与工程》1998年第4期240-245,共6页Materials Science and Engineering of Powder Metallurgy

摘　　要：研究了尾矿微晶玻璃LCAS(Li_2O-CaO-Al_2O_3-SiO_2)的增韧补强,讨论了不同含量的SiC_w和ZrO_2对材料力学性能的影响,并利用XRD和SEM手段对材料的相组成和微观结构进行了分析。结果表明:SiC_w和ZrO_2的复合增韧效果比其单一增韧效果更显著;通过控制LCAS微晶玻璃的热膨胀系数、SiC_w和ZrO_2的含量以及ZrO_2的稳定剂含量和其粒径。可获得协同增韧效果。The toughening mechanism of LCAS-SiC_w-ZrO_2 composites were investigated. The effects of volume fraction of SiC_w and ZrO_2 on mechanical properties of composites were discussed. The crystalline phases and micro structure of LCAS-SiC_w-ZrO_2 composites were analysed by means of XRD and SEM. The results show that the combined toughness increment resulting from the use of SiC_w and ZrO_2 is greater than the sum of individual toughness increments achieved solely with either toughening agent. By controlling the thermal-expansion coefficients of LCAS glass-eeramics, the content of SiC_w and ZrO_2 and the stability of ZrO_2, the synergistin toughening effects can be obtaimed. When the content of SiC_w was 30 vol% and the content of ZrO_2 college of Resource, Enviromment and Civil Engineering, CSUT, Changsha was 15 vol%, the fracture toughness and the flexure strength of the composite can be increased from 1.7 MPa·m^(1/2) and 86.5 MPa to 6.4 MPa·m^(1/2) and 331.7 MPa.

关 键 词：LCAS微晶玻璃 相变增韧 复合增韧 复合材料 

分 类 号：TQ171[化学工程—玻璃工业]