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采用超窄脉宽脉冲电流、扫描电子显微镜和X射线衍射仪等现代分析手段和工具,以纳米稀土La2O3为电铸液添加剂,研究了脉冲电参数对电铸层微观结构及力学性能的影响。试验结果表明:由于纳米稀土La2O3的独特吸附作用,脉冲条件下获得的电铸层晶粒细小,组织均匀,其力学性能明显优于普通直流电铸层的力学性能;在ton为100μs、toff为500μs、电流密度为3A/dm2时,铸层显微硬度和耐磨性比普通电铸层有显著提高。
The effects of pulse electrical parameters on the microstructure and mechanical properties of the electroformed layers were investigated by using modern analytical tools and tools such as ultra-narrow pulse current, scanning electron microscopy and X-ray diffraction, and using La2O3 as the additive. The experimental results show that the mechanical properties of the electroformed layer are better than that of the normal DC electroformed layer due to the unique adsorption of nano-rare earth La2O3. The electroforming layer obtained under pulsed condition has fine grain size and uniform microstructure. At ton of 100μs and toff of 500μs , The current density of 3A / dm2, the cast microhardness and wear resistance than ordinary electroformed layer has significantly improved.