Production method of polycrystalline ceramic body
    9.
    发明申请
    Production method of polycrystalline ceramic body 失效
    多晶陶瓷体的生产方法

    公开(公告)号:US20060091588A1

    公开(公告)日:2006-05-04

    申请号:US11258356

    申请日:2005-10-25

    IPC分类号: C04B33/32

    摘要: To provide a production method of a polycrystalline ceramic body with excellent density, a preparation step, a mixing step, a forming step and a heat-treating step are performed. In the preparation step, a coarse particle ceramic powder, and a fine particle powder having an average particle diameter of ⅓ or less of the average particle diameter of the coarse particle ceramic powder are prepared. In the mixing step, the coarse particle ceramic powder and the fine particle powder are mixed to produce a raw material mixture. In the forming step, the raw material mixture is formed to a shaped body. In the heat-treating step, the shaped body is heated and thereby sintered to produce a polycrystalline ceramic body. In the heat-treating step, a temperature elevating process and a first holding process are performed and at the same time, a second holding process and/or a cooling process are performed. In the temperature elevating process, heating is started to elevate the temperature and in the first holding process, the shaped body is held at a temperature T1° C. In the second holding process, the shaped body is held at a temperature T2° C. lower than the temperature T1° C. In the cooling process, the shaped body is cooled at a temperature dropping rate of 60° C./h or less from the temperature T1° C.

    摘要翻译: 为了提供具有优异密度的多晶陶瓷体的制造方法,进行制备步骤,混合步骤,成形步骤和热处理步骤。 在制备步骤中,制备粗颗粒陶瓷粉末和平均粒径为粗颗粒陶瓷粉末的平均粒径的1/3以下的细颗粒粉末。 在混合步骤中,将粗颗粒陶瓷粉末和细颗粒粉末混合以制备原料混合物。 在成形步骤中,将原料混合物形成为成形体。 在热处理工序中,加热成形体,由此烧结而制成多晶体。 在热处理步骤中,进行升温处理和第一保持处理,同时进行第二保持处理和/或冷却处理。 在升温过程中,加热开始升温,在第一保持过程中,成形体保持在T1℃的温度。在第二保持过程中,成形体保持在T2℃的温度。 低于温度T1℃。在冷却过程中,成形体从温度T1℃以60℃/小时以下的降温速度冷却。