放電表面処理によるW皮膜に関する研究

概要

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A tungsten (W) layer whose thickness was tens of micrometers or more was formed by electrical discharge coating using a W electrode which was made from the semi-sintered powder of pure W. The thickness of the W layer was 0.28 times the electrode wear length which was set up as the coating conditions. The density of the W layer was about 12.3×103kg/m3. Many solidified materials whose size was about 10 to 20 micrometers and many voids were observed in the W layer. The Vickers hardness test using the load of 9.8N showed that the hardness of the W layer was 281HV1. The diagonal length of the indentation of the test was several times as large as the solidified material in the W layer. The hardness of the W layer was lower than that of pure W metal.After electron beam irradiating, the densification of the W layer was observed. The thickness of the W layer was contracted from 0.58mm to 0.37mm and the hardness of the layer was improved to 1788HV1.