超细钨铜合金粉末在金刚石工具中的应用研究

采用超细钨铜合金粉末和单质钨、铜粉末热压烧结成两组金刚石胎体块,利用硬度计,排水法,万能实验机,扫描电镜和锯切实验等测试分析手段分别分析测量了胎体的硬度、致密度、抗弯强度、断口形貌和锯切性能。实验结果表明:在高钨基胎体配方中添加超细钨铜合金粉末比添加单质钨、铜粉末可以显著提高胎体的硬度10 HRB左右,改善胎体合金使之均匀化,在本实验配方中,干切硬花岗岩时,高钨基胎体配方中添加超细钨铜合金粉末比添加单质钨、铜粉末切割平稳,形成胎体和金刚石有效的磨损匹配,可以显著提高工具的使用寿命30%左右。烧结温度范围内,添加合金粉的胎体抗弯强度均比添加单质钨、铜粉末低100 MPa左右,这主要是使用的超细钨铜粉末的氧含量较高所致。

Study on ultra-fine tungsten-copper alloy powder used in diamond tools

Two kinds of diamond segments with ultra-fine tungsten-copper alloy powder and with element tungsten and copper powder as additives into the matrix were sintered respectively. The performances of segments such as matrix hardness, density, bending strength, fracture shape and cutting performance were analyzed by hardness-meter, water-draining, universal testing machine and scanning electronic microscopy as well as cutting test. The resuhs indicated that, in comparison with element Cu and W powder, ultra-fine alloyed Cu-W powder additive in high W-based matrix led to increased matrix hardness by 10 HRB, improved homogeneity of matrix powders, stable operation when dry cutting hard granite, and prolonged lifespan by 30% owing to accordant wear of matrix and diamond grits. However, the bending strength of the matrix with additive of ultra -fine Cu-W alloyed powder was lower by about 100 MPa, this may be because of the higher oxygen content in the ultra-fine Cu-W powder.