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无机材料学报

• 研究论文 • 上一篇    下一篇

SiC-ZrO2(3Y)-Al2O3纳米复相陶瓷的力学性能和显微结构

高濂1; 王宏志1; 洪金生1; 宫本大树2; ＤＩＡＺＤＥＬＡＴＯＲＲＥＳｅｂａｓｔｉａｎ2   

  1. 1. 中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室, 上海 200050; 2. 日本大贩府立产业技术综合研究所, 大阪, 594-1157 日本
  • 收稿日期:1998-10-12 修回日期:1998-11-30 出版日期:1999-10-20 网络出版日期:1999-10-20

Mechanical Properties and Microstructure of SiC-ZrO2(3Y)-Al2O3 Nanocomposites

GAO Lian1; WANG Hong-Zhi1; HONG Jin-Sheng1; MIYAMOTO Hiroki2; DIAZ DE LA TORRE Sebastian2   

  1. 1.State Key Lab of High Performance Ceramics and Superfine Microstructure; Shanghai Institute ofCerumics; Chinese Academy of Sciences Shanghai 200050 China; 2. Technology Research Institute of Osaka Prefecture Osaka 594-1157 Japan
  • Received:1998-10-12 Revised:1998-11-30 Published:1999-10-20 Online:1999-10-20

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摘要： 本文介绍用非均相沉淀方法制备的纳米ＳｉＣ－ＺｒＯ２（３Ｙ）－Ａｌ２Ｏ３复合粉体经放电等离子超快速烧结得到晶肉型的纳米复相陶瓷；超快速烧结的升温速率为６００／ｍｉｎ；在烧结温度不保温，迅即在３ｍｉｎ内冷却至６００以下．力学性能研究结果表明，在１４５０超快速烧结得到的纳米复相陶瓷的抗弯强度高达１２００ＭＰａ，断裂韧性Ｋ１ｃ为５ＭＰａ·ｍ１／２ＴＥＭ像显示纳米ＳｉＣ颗粒大多分布在Ａｌ２Ｏ３母体晶粒内，也有一些纳米ＳｉＣ颗粒分布在ＺｒＯ２晶粒内．断裂表面的ＳＥＭ像表明，穿晶断裂是其主要的断裂模式，这是所制备的纳米复相陶瓷力学性能大幅提高的主要原因．

关键词: 纳米复相陶瓷, 放电等离子烧结, 力学性能, 显微结构

Abstract: Heterogeneous precipitation methods were used to produce 5wt% SiC-15wt% ZrO2(3Y)-Al2O3 nanocomposite powders.
The aqueous suspension’s pH controlled between 9 and 10, and the resulting gel calcined at 1000℃ are two key processes for preparing nanocomposite powders. 5wt% SiC-15 wt% ZrO2(3Y)-Al2O3
nanocomposites were superfast densified using spark plasma sintering (SPS) process by heating to a sintering temperature between 1350 to 1600℃
at a heating rate of 600℃/min, without holding time, and then fast cooling to 600℃ within 3 minutes. Bending strength of 5wt% SiC-15wt%
ZrO2(3Y)-Al2O3 nanocomposites sintered at 1450℃ reached a value as high as 1200MPa, while the fracture toughness of the sample
sintered at 1450℃ was above 5MPa·m1/2, which is significantly higher than that of SiC-Al2O3 nanocomposites and Al2O3 ceramics. Microstructure studies found that nano-SiC particles
were mainly located within Al2O3 grains and the fracture mode of the nanocomposites was mainly transgranular fracture. It is the main reason
why the intra-type nanocomposites show excellent mechanical properties, while in present research system, a part of contribution to high mechanical
properties is from ZrO2 phase transformation toughening.

Key words: SiC nanocomposites, spark plasma sintering, mechanical property

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