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    Method of making a net shape sintered ceramic product
    81.
    发明公开
    Method of making a net shape sintered ceramic product 失效
    Verfahren zur Herstellung eines gesinterten keramischenFormkörpers。

    公开(公告)号：EP0186327A2

    公开(公告)日：1986-07-02

    申请号：EP85308661.9

    申请日：1985-11-28

    申请人： FORD MOTOR COMPANY LIMITED ,  FORD-WERKE AKTIENGESELLSCHAFT ,  FORD FRANCE SOCIETE ANONYME

    发明人： Beckwith, Elaine Cecilia ,  Ezis, Andre

    IPC分类号： C04B35/00 ,  C04B35/58

    CPC分类号： C04B35/63424 ,  C04B35/584 ,  C04B35/591 ,  C04B35/634

    摘要： A polymeric processing aid is disclosed for compaction of ceramic or ceramic-forming powders at ambient temperatures and at pressures in excess of 15,000 psi and at impact rates of 12-44 strokes/minute without altering the chemical/ physical properties of the resulting ceramic. The processing aid comprises a polymerized acrylate or mixed acrylate/ methacrylate monomer which has been polymerized; the polymer is selected to have a T of at least 50°C below room temperature, a molar cohesive energy of 7000-20,000 cal/ mole. a number average molecular weight of 4000-20,000, a surface tension less than 35 dyne/cm, and a viscous liquid physical form at room temperature.
    A method of using such processing aid is also disclosed. The method comprises mixing silicon powder with oxygen-carrying agents (Y 2 O 3 , Al 2 O 3 SiO 2 ) in the amount of 4-19% by weight of the mixture along with 2-3.5% by weight of the processing aid. The mixture is subjected to high speed cold-compaction at pressures in excess of 15,000 psi with an impact rate of 12-44 strokes/minute. The compacted and ejected cold-pressed body is heat treated to form a dense Si 3 N 4 object.

    摘要翻译： 公开了一种聚合物加工助剂，用于在环境温度和超过15,000psi的压力和12-44冲程/分钟的冲击速率下压实陶瓷或陶瓷成形粉末，而不改变所得陶瓷的化学/物理性能。 加工助剂包括已经聚合的聚合丙烯酸酯或混合的丙烯酸酯/甲基丙烯酸酯单体; 选择聚合物具有低于室温至少50℃的Tg，摩尔内聚能为7000-20,000cal / mole。 数均分子量为4000-20,000，表面张力小于35达因/厘米，室温下为粘性液体物理形式。 还公开了一种使用大量加工助剂的方法。 该方法包括将硅粉与混合物的重量比为4-19％的氧载体（Y 2 O 3，Al 2 O 3 SiO 2）和加入助剂的2-3.5重量％混合。 混合物在超过15,000psi的压力下以12-44冲程/分钟的冲击速率进行高速冷压实。 压实和喷射的冷压体被热处理以形成致密的Si 3 N 4物体。