Effects of adding Si3N4 whiskers to ZrB2-SiC ceramics on microstructure, mechanical properties and oxidation resistance

被引：2

作者：

Duan, Xianghan ^{[1
]}

Wei, Chuncheng ^{[1
]}

Geng, Xin ^{[1
,2
]}

Meng, Fantao ^{[1
]}

Zhou, Lijuan ^{[1
]}

Wang, Peng ^{[1
,2
,3
]}

Dong, Zhichao ^{[1
]}

Dong, Shuhua ^{[1
]}

机构：

[1] Shandong Univ Technol, Sch Mat Sci & Engn, Zibo 255049, Peoples R China

[2] Natl Univ Def Technol, Sci & Technol Adv Ceram Fibers & Composites Lab, Changsha 410073, Peoples R China

[3] Shandong Ind Ceram Res & Design Inst CO Ltd, Zibo 255000, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2024年 / 50卷 / 21期

基金：

中国国家自然科学基金;

关键词：

Si-3; N-4; whiskers; Grain refinement; Mechanical properties; Oxidation resistance; ZrB2-SiC; SILICON-NITRIDE CERAMICS; SINTERING BEHAVIOR; GRAIN-SIZE; COMPOSITE;

D O I：

10.1016/j.ceramint.2024.08.166

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-Si3N4w ceramics (ZSN(w)) were prepared via the hot-pressing sintering method. The bending strength and fracture toughness of ZSN(w) at room temperature reached to 520 +/- 24 MPa and 5.2 +/- 0.16 MPa m(1/2), respectively. The enhancement in mechanical properties is attributed to the grain refinement and attenuation of grain boundary induced by the homogeneous distribution of Si3N4 whiskers. The oxidation resistance of ZSN(w) were conducted at 1500 degrees C in an air atmosphere. Remarkably, after 10 h of oxidation, ZSN(w) remained excellent strength and toughness reaching at 589 +/- 26 MPa and 4.8 +/- 0.12 MPa m(1/2), respectively. This oxidation resistance of ZSN(w) was mainly attributed to the gain refinement induced by Si3N4 whiskers, which effectively reduced the voids within the ceramic matrix. Therefore, this process promoted the densification and homogenization of the SiO2 protective barriers, accompanied with hindering the inward permeation of oxygen and the outward release of oxides.

引用

页码：43153 / 43164

页数：12

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