以性能较好的铁基结合剂为基体,加入表面未镀、镀Ni和纳米Al2O3/Ni复合镀层的金刚石,用热压烧结的方法得到铁基结合剂金刚石节块,测量了金刚石铁基结合剂节块的抗弯强度和耐磨性,采用SEM和EDS对复合镀层和金刚石表面的形貌和组分进行了表征.结果表明:在金刚石表面镀覆纳米Al2O3/Ni层后,复合镀层均匀致密,晶粒细小;在热压烧结中,复合镀层能阻止金刚石的石墨化,使金刚石和基体之间有强的化学结合,所以金刚石和铁基结合剂之间的界面结合紧密,结合剂对金刚石的把持力提高,节块的抗弯强度从468.9 MPa增加到563.8 MPa,磨耗比从349升高到700.
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