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用粉末模压成型工艺和无压烧结方法制备了Ti-Al混合烧结工具电极,采用所制备的电极在煤油中对45钢表面进行脉冲放电沉积(Ti,Al)C陶瓷涂层。探讨了粉体配比对工具电极致密度和相组成以及对液相放电所制备的涂层组织与表面形貌的影响。结果表明,随着Al含量的提高,工具电极密度和相对密度先下降后升高,当Al含量为60%时,电极密度达到最小;XRD结果显示制备出涂层的物相主要为(Ti,Al)C,而制备出的涂层表面形貌明显不同,随着电极中Al元素的升高,熔滴状的熔池尺寸越来越大,宏观上越来越粗糙,截面涂层厚度约为20μm。
The Ti-Al hybrid sintering tool electrode was prepared by powder molding and pressureless sintering. The surface of 45 steel was pulse-deposited (Ti, Al) C ceramic coating with kerosene. The effects of powder proportion on the electrode density and phase composition of the tool and the microstructure and surface morphology of the coating prepared by liquid-phase discharge were investigated. The results showed that with the increase of Al content, the electrode density and the relative density first decreased and then increased. When the Al content was 60%, the electrode density reached the minimum. The XRD results showed that the phase of the coating was (Ti, Al) C, while the surface morphology of the prepared coating is obviously different. With the increase of Al element in the electrode, the size of droplet-shaped molten pool is more and more large and rough on the macroscopic surface. The thickness of the cross-section coating is about 20 μm.