HIGH-ENERGY GAS THERMAL SPRAYING METHOD

摘要

PURPOSE:To improve the adhesion strength between a first-layer thermal sprayed film and a base material by thermal-spraying a mixture of the high-m.p. and high-hardness material and a low-m.p. pure metal material at the time of forming the thermal sprayed film consisting of the high-m.p. material on the base material surface. CONSTITUTION:The surface of the base material 1 is shotblasted, and then high energy resulting from the explosion or combustion of a gas is utilized. For example, a mixture of the high-m.p. and high-hardness material 3 and a pure metal or the alloy 4 contg. a pure metal is thermal-sprayed by a discontinuous explosion thermal spraying method. The powder of the mixture contg. 75wt% Cr3C2, the material 3, and 25wt% Ni-Cr alloy 4, for example, is thermal- sprayed to form the first-layer thermal sprayed film 2a. The powder of the mixture consisting, for example, of 92% ZrO2 and 8% Y2O3 as the high-m.p. material is then thermal-sprayed by the same thermal spraying method to form a surface-layer thermal sprayed film 2b. By this method, the particles of the material 3 can be infiltrated into the surface of the base material 1, and a strong anchor effect can be exhibited.