高铁基金刚石工具胎体烧结工艺及切割性能

Process and cutting performance of diamond tool with high Fe-content bond

通过调整高铁基胎体的成分,并测试分析烧结节块的力学性能和断口组织,研究并优化其成分设计和烧结工艺。结果表明:设计成分为Fe质量分数75%、扩散CuSn10质量分数15%、Cu+Ni质量分数10%的高铁基胎体综合性能较好,其烧结温度范围为910～940℃,硬度HRB 90以上,抗弯强度1 200 MPa以上,断口组织呈较明显的韧窝状。胎体在此条件下合金化程度较好,且较宽的工艺范围也适合工业化生产。用该高铁基胎体制备一种低成本激光焊接通用金刚石锯片LW350,并同市售相同规格的代表性同类锯片进行水泥混凝土切割对比试验,结果表明:采用该胎体制备的激光焊接通用锯片可显著降低成本;锯片的锋利度降低约15%,寿命提高约20%。

High Fe-content bond are designed and mechanical tests and fracture texture observation are done to their sintered segment for the purpose of evaluating their rationality of the component design and sintering process. Results show that the designed high Fe-content bond with component of (Fe)75(CuSn10)15(Cu-Ni)10 has a proper sintering temperature range of 910 to 940 ℃, hardness over HRB 90 and bending strength over 1200 MPa. Dimple tissue structure are apparently observed on the fractures which indicates that the bond has been well alloyed. At the same time, the wide process range means that it is adaptable for commercial fabrication. A low cost laser welding universal diamond saw blade LW350 is fabricated with this bond and comparisons are made to representative same kind of diamond saws on market by cutting tests taken on steel reinforced C45 concrete. The results show that self-fabricated diamond saw has lower sharpness at a level of about 15% decrease and longer life of about 20% exceeding while the cost is cut down apparently.