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无机材料学报

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纳米氧化钛陶瓷的烧结

高濂; 黄军华   

  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
  • 收稿日期:1996-09-28 修回日期:1996-11-20 出版日期:1997-12-20 网络出版日期:1997-12-20

Sintering of Nanocrystalline Titania

GAO Lian; HUANG Junhua   

  1. State Key Lab of High Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics; Chinese Academy of Sciences Shanghai 200050 China
  • Received:1996-09-28 Revised:1996-11-20 Published:1997-12-20 Online:1997-12-20

PDF (PC)

881

被引次数

21

摘要： 将醇盐水解制备的纳米氧化钛粉体（～13nm）在500～800℃下煅烧，用XRD研究氧化钛相变过程中粉体的热稳定性，发现在加入0．4wt％的金红石相作为晶种后；晶粒生长受到较好的控制，同时分别在30、57和200MPa下对纳米氧化钛样品进行热压烧结，用密度仪、压汞仪和SEM对烧结前后的样品进行表征后表明，700℃的热压烧结样品已开始致密化，200MPa、800℃热压烧结样品的相对密度为97．2％，此时3～15nm的小气孔仍难以消除，这些小气孔的存在是纳米氧化钛陶瓷在较高的压力下难以完全致密的主要原因．

关键词: 纳米氧化钛, 晶种, 热稳定性, 热压烧结

Abstract: anocrystalline titania powder was prepared by the hydrolysis of titanium butoxide. The grain sizes of the powder calcined at 500～800℃ were measured by XRD. It was
found that the thermal stability of nanosized titania powder was improved by adding 0.4wt% rutile. Meanwhile, the powder compacts (green density was 68.3%) were
sintered at 750℃ and 800℃ under 30MPa, 57MPa and 200MPa, respectively. The microstructural development was studied by Poresizer, Pycnometer and SEM. Because
of the high pressure which increases intrinsic driving force for the diffusional transport of the pores, the densification process of hot-pressed samples commences at 750℃.
After the samples were sintered at 200MPa/800℃, the relative density was about 97.2%. Furthermore, the interagglomerational pores with size of 3～15nm could be
found in the samples, even if high pressure was used. Probably it is the main reason that the nanosized titania could not be densified thoroughly at low temperature.

Key words: nano-titania, crystalline seed, thermal stability, hot-pressure sintering