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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

放电等离子快速烧结SiC晶须增强Si3N4BN层状复合材料

李翠伟; 黄勇; 汪长安; 汤珂; 李淑琴   

  1. 清华大学材料科学与工程系新型陶瓷与精细工艺国家重点实验室 北京 100084
  • 收稿日期:2001-09-24 修回日期:2001-11-30 出版日期:2002-11-20 网络出版日期:2002-11-20

Fabrication of SiC Whisker Reinforced Laminated Si3N4 /BN Ceramics by Spark Plasma Sintering

LI Cui-Wei; HUANG Yong; WANG Chang-An; TANG Ke; LI Shu-Qin   

  1. State key Lab of New Ceramics and Fine Processing; Department of Materials Science and Engineering; Tsinghua University; Beijing 100084; China
  • Received:2001-09-24 Revised:2001-11-30 Published:2002-11-20 Online:2002-11-20

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摘要： 采用放电等离子烧结技术(SPS)快速烧结了SiC晶须增强的Si3N4/BN层状复合材料.利用SPS技术,在烧结温度为1650℃、保温15min的条件下,材料的密度可达3.18g/cm3,抗弯强度高达600MPa,断裂功达到3500J/m2.研究表明:特殊的层状结构、SiC晶须的拔出与折断是材料断裂功提高的主要原因.X射线衍射及扫描电子显微镜研究表明:α-Si3N4已经在短短的烧结过程中全部转变成长柱状的β-Si3N4,并且长柱状的β-Si3N4和SiC晶须具有明显的织构.

关键词: 放电等离子烧结, 层状复合材料, Si3N4

Abstract: SiC whisker reinforced laminated Si3N4/BN ceramics with additives Y2O3, Al2O3 and MgO were prepared by spark plasma sintering(SPS) in 13min of heating
to 1650℃ and 15min dwell time. The density of the samples densified by SPS was 3.18g/cm3. Bending strength reached 600 MPa, and the work of fracture
reached 3500 J/m2. The arrangement of hard Si3N4 layer and soft BN layer, the pull-out and broken of SiC whisker were the main reason for improving toughness
of this ceramic. XRD and SEM indicated SiC whisker, long rod like β-Si3N4 and platelet like hex-BN were the main phase and SiC whisker, long rod like β-Si3N4 had strong preferred orientation.

Key words: SPS, laminated ceramics, Si3N4

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