高エネルギー密度電子ビーム溶射法の確立に関する研究

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The purpose of this research project is to develop a new surface modification method using high energy density electron beam and to apply it to a dense WC-Co coating which is difficult to achieve with conventional thermal spraying method.A heat source used was a 30kW electron beam welder and materials used were WC-12%Co powders with Ni-Cr self fusion alloy powder.A WC-Co coating of over 800 mum in thickness which dispersed densely and homogeneously in Ni-Cr matrix on mild steel substrate was obtained using the mixed powder setting method. The coating layrs were examined by X-ray diffraction, EPMA,Vickers hardness test, sliding abrasion test and corrosion test. It was found that this coating layrs have enough abrasion and corrosion characteristics. Furthermore, the formation mechanism of coating layr by high energy density electron beam was analyzed.A powder feeder which can function under vacuum condition and electron beam spraying method which can form a coating layr continuosly in vacuum was developed. A similar coating layr as the powder setting method was obtained under a continuous feeding condition in vacuum.