Pressureless sintering of ultra-high temperature ZrB2-SiC ceramics

被引：8

作者：

Cheng, Zhi-Qiang ^{[1
]}

Zhou, Chang-Ling ^{[2
,3
]}

Tian, Ting-Yan ^{[2
]}

Sun, Cheng-Gong ^{[2
]}

Shi, Zhi-Hong

Fan, Jie ^{[2
]}

机构：

[1] Wuhan Univ Technol, Sch Mat Sci & Engn, Wuhan 430070, Peoples R China

[2] Shandong Res & Design Inst Ind Ceram, Zibo 255031, Peoples R China

[3] Jinan Univ, Sch Mat Sci & Engn, Jinan 250022, Peoples R China

来源：

HIGH-PERFORMANCE CERAMICS V, PTS 1 AND 2 | 2008年 / 368-372卷

关键词：

ZrB2-SiCUHTCs; pressureless sintering; crystallization annealing; ablation resistance; MECHANICAL-PROPERTIES; MICROSTRUCTURE;

D O I：

10.4028/www.scientific.net/KEM.368-372.1746

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：

ZrB2-SiC ultra-high temperature ceramics (UHTCs) were pressureless sintered with Y2O3-Al2O3 as the sintering additives. The effects of sintering additive and crystallization annealing on the microstructure and properties of ZrB2-SiC UHTCs were investigated. Sintering was activated by producing liquid phase of Y2O3 and Al2O3. The relative density of sintered ZrB2-20wt%SiC ceramic could reach 96% when the content of sintering additive was 6% and the sintering temperature was 1750 degrees C and its bending strength, Vickers hardness, and fracture toughness were 412 Mpa, 13 GPa, and 6.0 MPa.ml(1/2), respectively. The crystallization annealing can result in YAG phase from grain boundary and enhance the high temperature properties of the UHTCs. The UHTCs have excellent ablation resistance at ultra-high temperatures, and a very low ablation rate of 0.0006 mm/s after ablation for 900s at 2800 degrees C.

引用

页码：1746 / +

页数：2

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