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    • 6. 发明公开
    • Production process for machinable ceramics
    • Verfahren zur Herstellung bearbeitbarer Keramiken。
    • EP0421391A1
    • 1991-04-10
    • EP90118987.8
    • 1990-10-04
    • MITSUI MINING COMPANY, LIMITED
    • Ooishi, TakashiMatsumoto, Akira
    • C04B33/13C04B33/32C04B35/18C03C14/00
    • C03C14/004C03C2214/04C04B33/13C04B33/32C04B35/195
    • Machinable ceramics with 30-60 vol.% of fine crystals of fluorophlogopite, a synthetic mica, evenly dispersed in a vitreous matrix is produced using as principal raw materials kaolin and activated clay, which are natural minerals, other than metal oxides themselves. According to the production process, a mixture of fine particulate raw materials is calcined under first heat treatment conditions in which a maximum temperature is in the range of 1,000-1,100°C. The raw materials include kaolin and activated clay as principal raw materials, Mg-­containing, K-containing and F-containing compounds as auxiliary raw materials and B₂O₃ as a sintering aid. The resulting calcined mass is ground into fine parti­cles, followed by the formation of a green body of a desired shape. The green body is then sintered into a fired body under second heat treatment conditions in which a maximum temperature is in the range of 1,100-­1,250°C.
    • 使用均匀分散在玻璃质基质中的30-60体积%的氟金云母精细晶体的合成云母作为主要原料高岭土和活性白土作为主要原料生产,这些天然矿物是金属氧化物本身以外的。 根据生产工艺,在最高温度为1000-1100℃的第一热处理条件下煅烧细颗粒原料的混合物。原料包括高岭土和活性粘土作为主要原料,Mg 作为辅助原料的含K和F的化合物和作为烧结助剂的B 2 O 3。 将所得的煅烧物料研磨成细颗粒,然后形成所需形状的生坯。 然后在第二热处理条件下将生坯烧结成烧制体,其中最高温度在1,100-1,250℃的范围内。