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通过球磨与低压烧结方法,制备了超细晶WC-10Co合金。采用X射线衍射、扫描电镜和断裂韧性测试,研究了LaB6掺杂对超细晶WC-10Co合金的组织与断裂韧性影响。结果表明,掺杂微量LaB6,能明显提高烧结体合金的致密度,减少合金中WC晶粒的异常长大及烧结过程中Co3W3C相的形成,合金的断裂韧性最终得以提高。1450℃烧结后,掺杂1%LaB6合金的断裂韧性从7.3 MPa.m1/2提高到12.3 MPa.m1/2。
Ultrafine grained WC-10Co alloy was prepared by ball milling and low pressure sintering. The effects of LaB6 doping on the microstructure and fracture toughness of ultrafine WC-10Co alloy were investigated by X-ray diffraction, scanning electron microscopy and fracture toughness test. The results show that the addition of a trace amount of LaB6 can significantly increase the density of the sintered alloy and reduce the abnormal growth of WC grains and the formation of Co3W3C during sintering. The fracture toughness of the alloy finally increases. After 1450 ℃ sintering, the fracture toughness of 1% LaB6 alloy increases from 7.3 MPa.m1 / 2 to 12.3 MPa.m1 / 2.