| 摘要 |
PURPOSE:To suppress the diffusion of boron into a base material and to produce a high hardness coating material having a long life by forming an intermediate layer consisting of group IVa elements, etc. of the periodic table on the surface of the base material and forming a boron nitride film on the surface of the intermediate layer. CONSTITUTION:The intermediate layer 2 is formed of the group VIa element (Ti, etc.), group Va element (Nb, etc.), group VIa element (Mo, etc.) of the periodic table or the carbides (MoC, etc.) or nitrides (TiN, etc.) on the surface of a tool material 1 consisting of a sintered hard alloy or tool steel. The boron nitride film 3 contg. cubic crystal boron nitride, cubic crystal SiBN or cubic crystal BCN is formed on the surface of the intermediate layer 2 to prepare the high hardness coating material 4. The diffusion of the boron which is the component of the boron nitride film 3 into the base material 1 is thus suppressed by the intermediate layer 2 and the generation of a brittle layer is prevented.
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