发明授权
- 专利标题: Method for producing unsintered cristobalite particles
- 专利标题(中): 生产未烧结方石英颗粒的方法
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申请号: US814051申请日: 1991-12-26
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公开(公告)号: US5154905A公开(公告)日: 1992-10-13
- 发明人: Iwao Ohshima , Koichi Orii , Naotake Watanabe , Yasumasa Yamaguchi
- 申请人: Iwao Ohshima , Koichi Orii , Naotake Watanabe , Yasumasa Yamaguchi
- 申请人地址: JPX Tokyo
- 专利权人: Nitto Chemical Industry Co., Ltd.
- 当前专利权人: Nitto Chemical Industry Co., Ltd.
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX2-093063 19900410; JPX3-082877 19910325
- 主分类号: C01B33/12
- IPC分类号: C01B33/12 ; C01B33/18 ; C03B19/10 ; C04B14/06
摘要:
A method for producing a nonsintered cristobalite particles comprising heating amorphous silica particles at a temperature of 1400.degree. to 1700.degree. C. in the presence of cristobalite particles (hereinafter referred to as cristobalite particles for addition and mixing) of at least 5 parts by weight based on 100 parts by weight of said amorphous silica particles to convert said amorphous silica particles to cristobalite particles with their particle form kept unchanged. According to the present invention, dense cristobalite having a low alkali content can be obtained in the form of particles. Such cristobalite is used as a filler, a dispersing agent, etc., and also as a material for high-quality artificial quartz, ceramics, etc., and particularly as a material for transparent quartz glass because of its generating no bubbles at the time of melt-molding.
公开/授权文献
- US5936831A Thin film tantalum oxide capacitors and resulting product 公开/授权日:1999-08-10