Effects of Sc2O3 sintering aid for the densification and mechanical properties of SiC-ZrB2 composites

被引：7

作者：

Muksin ^{[1
]}

Yoon, Dang-Hyok ^{[1
]}

Raju, Kati ^{[1
]}

机构：

[1] Yeungnam Univ, Sch Mat Sci & Engn, Gyongsan 38541, South Korea

来源：

CERAMICS INTERNATIONAL | 2016年 / 42卷 / 06期

关键词：

Mechanical properties; SiC; ZrB2; Microstructure; HIGH-TEMPERATURE CERAMICS; SILICON-CARBIDE CERAMICS; OXIDATION BEHAVIOR; MICROSTRUCTURE EVOLUTION; ZRB2-SIC COMPOSITE; ZIRCONIUM; STRENGTH; TOUGHNESS;

D O I：

10.1016/j.ceramint.2016.01.126

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

This study examined the effects of a Sc2O3 sintering aid on the density, microstructure and mechanical properties of SiC-5 vol% ZrB2 composites prepared by hot-pressing. Microstructural studies showed that the addition of Sc2O3 not only caused a decrease in the hot-pressing temperature from 1950 to 1750 degrees C by liquid phase sintering, but also resulted in the formation of crystalline Sc4Zr3O12 at the grain boundaries via a reaction with ZrO2 on the surface of the ZrB2 powder. The addition of Sc2O3 produced a fine-grained microstructure with a 43% (430 -> 615 MPa) and 20% (3.6 -> 4.3 MPa m(1/2)) increase in flexural strength and fracture toughness, respectively, compared to the SiC ZrB2 composite without Sc2O3. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

引用

页码：7300 / 7308

页数：9

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