天津有色金属研究所研制成功一种新型钻头。该钻头以铜—镍—锡系合金为粘结剂,以金刚石为切削刃。这种粘结剂较铜—镍—锰系合金粘结剂熔点降低50℃,有利于钻头烧结成形,从而保证了钻头的整体耐磨性,其硬度不小于80HRC,抗拉强度σ_b≥294MPa。在相同地质条件下,较美国王牌钻头J38提高钻进深度24％,单只钻头的钻井深度平均达到55.7m。 Tianjin Nonferrous Metal Research Institute successfully developed a new type of drill. The drill uses a copper-nickel-tin alloy as a binder and a diamond as a cutting edge. The binder is 50 ℃ lower than the melting point of the copper-nickel-manganese alloy binder, which is favorable for the sintering of the bit, thereby ensuring the overall wear resistance of the bit. The hardness is not less than 80 HRC and the tensile strength σ_b is more than or equal to 294 MPa. Under the same geological conditions, drilling depth was increased by 24% compared with that of the United States ace J38. The drilling depth of a single drill reached an average of 55.7m.