Polycrystalline cubic boron nitride composite sheet and preparation method thereof: Fid-Bau Portal

Polycrystalline cubic boron nitride composite sheet and preparation method thereof

ZHANG FENG / LI YUNSHENG

The invention relates to a polycrystalline cubic boron nitride composite sheet and a preparation method thereof. The polycrystalline cubic boron nitride composite sheet comprises a hard alloy matrix layer and a polycrystalline cubic boron nitride layer laminated on the hard alloy matrix layer, based on the total weight of the polycrystalline cubic boron nitride layer preparation raw materials, the polycrystalline cubic boron nitride layer preparation raw materials comprise 55-70 wt% of cubic boron nitride micro powder and 30-45 wt% of ceramic binder micro powder, and the particle size of the ceramic binder micro powder is 50-180 nm. The ceramic binder in the polycrystalline cubic boron nitride composite sheet is a nano ceramic binder (the particle size is 50-180nm), the ceramic binder with the size has the characteristics of small size, high activity and the like, gaps in the material can be easily filled, the density of the composite material can be obviously increased, the bridging effect can be reduced or eliminated, and the service life of the composite material can be prolonged. The stress distribution in the material is more uniform, and the expansion of cracks can be inhibited, so that the toughness of the PCBN composite sheet is improved.

本申请涉及一种聚晶立方氮化硼复合片及其制备方法。所述聚晶立方氮化硼复合片包括硬质合金基体层和叠合于硬质合金基体层上的聚晶立方氮化硼层；以聚晶立方氮化硼层制备原料的总重量计，聚晶立方氮化硼层的制备原料包括55~70wt%的立方氮化硼微粉和30~45wt%的陶瓷粘结剂微粉，陶瓷粘结剂微粉的粒径为50~180nm。本申请所述聚晶立方氮化硼复合片中的陶瓷粘结剂为纳米陶瓷粘结剂（粒径为50~180nm），该尺寸的陶瓷粘结剂具有尺寸小及活性高等特点，很容易填补材料中的空隙，不仅可以显著增加复合材料的密度，减少或消除“桥接效应”，使材料中的应力分布更加均匀，而且会抑制裂纹的扩展，进而提高PCBN复合片的韧性。

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