高级检索
无机材料学报

无机材料学报 >

2007 , Vol. 22 >Issue 3: 489 - 492

DOI: https://doi.org/10.3724/SP.J.1077.2007.00489

研究论文

凝胶浇注成型制备致密 SiC陶瓷材料

  • 张涛 ,
  • 张兆泉 ,
  • 张景贤 ,
  • 林庆玲 ,
  • 江东亮
展开

  • 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．中国科学院研究生院, 北京 100049

收稿日期: 2006-07-05

  修回日期: 2006-09-06

  网络出版日期: 2007-05-20

收起

Preparation of Dense SiC Ceramics by Aqueous Gelcasting

  • ZHANG Tao ,
  • ZHANG Zhao-Quan ,
  • ZHANG Jing-Xian ,
  • LIN Qing-Ling ,
  • JIANG Dong-Liang
Expand
  • 1. State Key Laboratory of High Performance Ceramics and
    Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of
    Sciences, Shanghai 200050, China; 2. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China

Received date: 2006-07-05

  Revised date: 2006-09-06

  Online published: 2007-05-20

Fold

摘要

采用一种凝胶浇注成型预配液作为陶瓷粉体的分散介质, 将亚微米级SiC粉体和烧结助剂Y2O 3、 Al2O3直接混合, 制得了固含量>50vol%的凝胶浇注浆料, 在100s -1 的剪切速率下, 浆料粘度<1Pa．s, 可以顺利实现凝胶浇注成型; 对得到的SiC素坯进行了无压烧结. 在2000℃保温1h(氩气氛)的烧结条件下, 烧结体相对密度为(98.1± 0.2)%, 抗折强度、硬度和韧性分别为(722 ±70)MPa、(20.18 ±0.75)GPa、(4.00 ±0.20)MPa ．m 1/2.

关键词： SiC; 凝胶浇注成型; 无压烧结

本文引用格式

张涛 , 张兆泉 , 张景贤 , 林庆玲 , 江东亮 . 凝胶浇注成型制备致密 SiC陶瓷材料[J]. 无机材料学报, 2007 , 22(3) : 489 -492 . DOI: 10.3724/SP.J.1077.2007.00489

Abstract

Concentrated SiC slurry with Y2O3 and Al2O3 as sintering assistants was prepared, by using the medium of gelcasting premix solution and pH adjusting reagent of TMAH (tetramethylammonium hydroxide). The measurements of Zeta potential, sedimentation and viscosity show that SiC, Y2O3 and Al2O3 can disperse well in premix solution at basic region. Rheological study clarifies that concentrated SiC gelcasting slurry has low viscosity and shear stress after adding 0.5wt% TMAH, which is suitable to cast into the mold. The green body formed by gelcasting was pressureless sintered at 2000℃ for 1h. SEM image of SiC ceramic indicates that the structure of SiC sintered body is homogeneous and no obvious defects existing. The relative density, flexural strength, hardness and toughness of SiC sintered body are (98.1± 0.2)%, (722±70)MPa, (20.18±0.75)GPa and (4.00±0.20)MPa ．m 1/2, respectively.

Key words： SiC; gelcasting; pressureless-sintering

参考文献

[1] Whalen T J. Ceram. Eng. Sci. Proc., 1986, 7 (9-10): 1135--1143.
[2] Young A C, Omatete O O, Janney M A, et al. J. Am. Ceram. Soc., 1991, 74 (3): 612--618.
[3] Omatete O O, Janney M A, Nunn S D. J. Eur. Ceram. Soc., 1997, 17 (2-3): 407--413.
[4] Zhou Longjie, Huang Yong, Xie Zhipeng. J. Eur. Ceram. Soc., 2000, 20: 85--90.
[5] Alliegro R A, Coffin L B, Tinklepaugh J R. J. Am. Ceram. Soc., 1956, 39 (11): 386--389.
[6] Kim D, Kim C H. J. Am. Ceram. Soc., 1990, 73 (5): 1431--1434.
[7] Prochazka S, Charles R J. Am. Ceram. Soc. Bull., 1973, 52 (12): 885--891.
[8] Omori M, Takei H. J. Am. Ceram. Soc., 1982, 65: C-92.
[9] Prochazka S. Ceramics for High Performance applications, 1974. 239--252.
[10] Coppola J A, Mcmurtry C H. Ceramics in the Service of Man, 1976.
[11] Williams R M, Juterbock B N, Shinozaki S S, et al. Am. Ceram. Soc. Bull., 1985, 64 (10): 1385--1389.
[12] 谭寿洪, 陈忠明, 江东亮. 硅酸盐学报, 1998, 26 (2): 191--197.
[13] She J H, Ueno K. Materials Research Bulletin, 1999, 34 (10-11): 1629--1636.
[14] 马景陶, 谢志鹏, 黄勇, 等. 硅酸盐学报, 2002, 30 (6): 716--720.
[15] Barton S D, Ollis W D. Comprehensive Organic Chemistry, 2. Oxford, New York: Pergamon Press, 1979. 958--1051.
Options
文章导航

/

〈 〉