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

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.