METHOD OF PREPARING A MULTIMODAL CUBIC BORON NITRIDE POWDER
    7.
    发明公开
    METHOD OF PREPARING A MULTIMODAL CUBIC BORON NITRIDE POWDER 审中-公开
    制备多型立方氮化硼粉末的方法

    公开(公告)号:EP3221280A1

    公开(公告)日:2017-09-27

    申请号:EP15808489.7

    申请日:2015-11-18

    IPC分类号: C04B35/5831 C04B35/626

    摘要: Multi-step milling processes to prepare cBN composite powder forms a first powder mixture by adding a binder and a first cBN component, mills the first powder mixture for a first time period, combines a second cBN component with the milled first powder mixture to form a second powder mixture, and mills the second powder mixture for a second time period (less than the first time period) to form the cBN composite powder. A ratio of the D50 value of the second cBN component to the D50 value of the first cBN component is at least 3.0. Two-step milling with different milling times for the two cBN component fractions controls the amount of mill debris in the cBN composite powder mixture. Further processing of the cBN composite powder under HPHT conditions forms a cBN-based ceramic with an average value of a cBN particle free diameter of less than 2.0 microns.

    摘要翻译: 通过添加粘合剂和第一种cBN组分,在第一时间段内研磨第一种粉末混合物,将第二种cBN组分与研磨的第一种粉末混合物组合以形成 第二粉末混合物,并且将第二粉末混合物研磨第二时间段(小于第一时间段)以形成cBN复合粉末。 第二cBN组分的D50值与第一cBN组分的D50值之比至少为3.0。 对于两种cBN组分部分,用不同研磨时间的两步研磨控制了cBN复合粉末混合物中研磨碎片的量。 在HPHT条件下进一步处理cBN复合粉末形成cBN颗粒自由直径小于2.0微米的平均值的cBN基陶瓷。