Process for preparing cubic boron nitride
    7.
    发明授权
    Process for preparing cubic boron nitride 失效
    制备立方氮化硼的方法

    公开(公告)号:US4409193A

    公开(公告)日:1983-10-11

    申请号:US354354

    申请日:1982-03-03

    CPC分类号: C01B35/146 C04B35/5831

    摘要: A process for preparing cubic boron nitride comprises heating hexagonal boron nitride and magnesium boron nitride at a temperature of at least 1350.degree. C. under a pressure at which the cubic boron nitride is thermodynamically stable, whereby the cubic boron having high strength and high purity can readily be obtainable. Also disclosed is a process for the preparation of magnesium boron useful as a starting material for the above process. This process comprises mixing hexagonal boron nitride and magnesium nitride or metal magnesium in a molar ratio of hexagonal boron nitride/magnesium being at least 0.6, and heating the mixture thus obtained, at a temperature of from 950.degree. to 1250.degree. C. under atmospheric pressure in a non-oxidizing atmosphere, e.g. a nitrogen atmosphere.

    摘要翻译: 制备立方氮化硼的方法包括在立方氮化硼在热力学稳定的压力下,在至少1350℃的温度下加热六方氮化硼和氮化硼,由此具有高强度和高纯度的立方硼可以 很容易获得。 还公开了制备用作上述方法的起始原料的镁硼的方法。 该方法包括将六方氮化硼和六氟化硼/镁的摩尔比至少为0.6的氮化镁或金属镁混合,并在大气压下在950至1250℃的温度下加热所获得的混合物 在非氧化气氛中,例如 氮气氛围。