CSB-2预合金粉质量分数和烧结温度对热压富铁基胎体力学性能的影响

热压富铁基金刚石钻头具有成本低、钻速高的优点，已在钻探中广泛应用。对比相同的热压富铁基胎体配方，通过测试试样的致密度、显微硬度、抗弯强度和抗冲击韧性，研究CSB-2预合金粉质量分数和烧结温度对金刚石钻头胎体力学性能的影响。试验结果表明:添加CSB-2预合金粉的胎体性能均比单质混粉胎体性能好。随CSB-2质量分数的增加，胎体的致密度、显微硬度、抗弯强度和抗冲击韧性分别最大提高了7.68%、27.99%、94.43%和312.82%；同时，胎体粉末预合金化有利于降低胎体的热压烧结温度；为获得良好的应用效果，CSB-2质量分数应大于30%，且最佳烧结温度为940~980℃。 

Effects of pre-alloyed CSB-2 powder addition and sintering temperature onphysical property of hot-pressed iron-rich diamond bit matrix

With the advantages of low cost and high drilling speed, the hot-pressed iron-rich based diamond bit has been deeply studied and applied in recent years. Compared to the same formula of the hot-pressed iron-rich matrix, the effect of the pre-alloyed CSB-2 addition and sintering temperature on the physical properties of diamond bit matrix were studied by compactness, microhardness, flexural strength and impact toughness tests. Results indicated that matrix performance of the added CSB-2 powder was better than that of the elemental mixed powders. With the increase of mass fraction of CSB-2, the compactness, microhardness, flexural strength and impact toughness of the matrix were increased by 7.68%, 27.99%, 94.43% and 312.82% respectively. At the same time, the pre-alloying of matrix formula could reduce the hot-pressing temperature. To obtain a good application performance, the optimum addition of CSB-2 should be higher than 30% and the preferred sintering temperature should range from 940℃ to 980℃.