无机材料学报

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云母微晶玻璃/Y-TZP复相材料的制备和力学性能

梁开明; 程慷果; 段仁官; 万菊林   

  1. 清华大学材料科学与工程系; 北京100084
  • 收稿日期:1997-06-23 修回日期:1997-07-14 出版日期:1998-06-20 网络出版日期:1998-06-20

Preparation and Mechanical Properties of Mica Glass-Ceramic/Y-TZP Composites

LIANG Kai-Ming; CHENG Kang-Guo; DUAN Ren-Guan; WAN Ju-Lin   

  1. Department of Materials Science and Engineering; Tsinghua University Beijing 100084 China
  • Received:1997-06-23 Revised:1997-07-14 Published:1998-06-20 Online:1998-06-20

摘要: 本文用烧结法制备了云母微晶玻璃/-TZP复相材料,用X光衍射分析(XRD)法测定了材料断裂过程中氧化锆的相变体积分数,用拉曼微探针谱测定了相变区宽度,并对增韧机制进行了研究.结果表明:氧化锆的加入可以显著提高材料的力学性能.当加入40vol%ZrO2时,云母微晶玻璃的强度和断裂韧性分别可达446MPa和4.8MPam1/2氧化锆的相变分数随氧化锆含量的增加而减小,而相变区宽度随氧化锆含量的增加而增大;氧化锆主要通过应力诱导相交增韧机制来提高云母微晶玻璃的断裂韧性,但随着氧化锆含量的增加,裂纹在氧化锆颗粒附近的偏转会进一步提高材料的断裂韧性.

关键词: 氧化锆, 云母微晶玻璃, 相变增韧, 力学性能

Abstract: Mica glass-ceramic/Y-TZP composites were prepared and characterized. The transformation fraction of t-ZrO2 decreased with the content of Y-TZP, determined by X-ray
diffraction analysis (XRD). The transformation width increased with increasing the content of Y-TZP, confirmed by Raman micro-area probe method. The mechanical properties
of mica glass-ceramic were significantly improved with the incorporation of Y-TZP. The flexural strength and fracture toughness of the glass ceramic doped with 40vol% ZrO2
were as high as 446MPa and 4.8MPa·m1/2, respectively. The stress-induced t-m transformation of zirconia dominantly contributed to the improvement of the fracture
toughness; however, crack deflection also played an additive role in the improvement of the fracture toughness of the composites with a relatively higher content of Y-TZP.

Key words: zirconia, mica glass-ceramic, transformation toughening, mechanical properties

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