(TiB+TiC)/TC4钛基复合材料电解加工基础试验研究

Experimental and Study on Electrochemical Machining of TC4 Titanium Alloy Matrix Composites Enhanced By TiB and TiC

针对钛基复合材料及其基体材料展开电解电化学特性研究,测量了TC4及(TiB+TiC)/TC4复合材料在NaNO 3溶液中的极化曲线和电流效率。研究发现,(TiB+TiC)/TC4复合材料相较于TC4分解电压更高,电流效率更低。选用合适的加工参数进行(TiB+TiC)/TC4复合材料的电解铣磨粗、精加工。结果表明:粗加工后平整性较差,有明显的接刀痕,反应面存在大量未脱落的晶须状增强相,表面粗糙度Ra为5.262μm。精加工后具有较好的平整性,可以观察到金属光泽与磨削的痕迹,表面粗糙度Ra减小至0.702μm。

The electrochemical characteristics of titanium matrix composites and their matrix materials were studied.The polarization curves and current efficiency of TC4 and(TiB+TiC)/TC4 composites in NaNO 3 solution were measured.The experimental results show that(TiB+TiC)/TC4 composites have higher decomposition voltage and lower current efficiency than TC4.Upon the implementation of electrochemical mill-grinding of(TiB+TiC)/TC4 composites and refined processing with appropriate machining parameters,the matrix composites has good flatness,observable metal luster and grinding traces with Ra being reduced to 0.702μm as compared with 5.262μm,which had poor flatness,obvious tool marks and enormous whisker like reinforcement due to rough machining.