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以TC4钛合金为电极,氮气作为反应气和保护气,在45钢表面原位反应生成含TiN的沉积层。对电压、电容、频率、转速和比沉积时间5个沉积层厚度影响因子,各设4个工艺水平,进行正交试验,研究多项工艺参数同时变化时沉积层厚度的变化规律。结果表明:选用电容为120μF,输出电压145 V,比沉积时间3 min/cm2时可获得综合质量最优的沉积层。电火花反应沉积层与基体形成冶金结合,沉积层均匀致密,厚度约为30～40μm,主要由TiN、FeTi和Fe9.64Ti0.36组成。沉积层的弹性模量为183.614 GPa,而纳米硬度达14.039 GPa,是基体的4倍。结果表明:原位反应电火花沉积可有效改善材料的表面性能。
Using TC4 titanium alloy as electrode and nitrogen as reactant gas and shielding gas, in-situ reaction on the surface of 45 steel resulted in the deposition of TiN-containing deposit. The influencing factors of voltage, capacitance, frequency, rotation speed and specific deposition time on five sedimentary layers were investigated. Four different technological levels were set up. The orthogonal experiment was carried out to study the variation law of sedimentary layer thickness when multiple technological parameters changed simultaneously. The results show that the optimal quality of the deposited layer can be obtained when the capacitance is 120μF, the output voltage is 145 V and the deposition time is 3 min / cm2. The EDM deposited layer is metallurgically bonded with the substrate. The deposited layer is uniform and compact, with a thickness of about 30-40 μm. It is mainly composed of TiN, FeTi and Fe9.64Ti0.36. The elastic modulus of the sedimentary layer is 183.614 GPa, while the nano-hardness reaches 14.039 GPa, which is four times that of the matrix. The results show that in situ reactive EDM can effectively improve the surface properties of the material.