| 摘要 |
A body coated with cubic boron nitride is disclosed which includes a base material, a first interlayer formed on the base material, a second interlayer formed on the first interlayer, a third interlayer formed on the second interlayer, and a cubic boron nitride film formed on the third interlayer. Each of the first and second interlayers comprises nitride or boride mixed with an adding element chosen from the IVb, IIIb, Vb, IVa, Va and VIa groups of the periodic table. In one embodiment of the invention, the composition ratio of the adding element to the nitride or boride decreases towards the surface between the second interlayer and the third interlayer. The third interlayer also contains nitride or boride mixed with an adding element chosen from the IVb, IIIb, Vb, IVa, Va and VIa groups of the periodic table. In one embodiment of the invention, the total mixing amount of the adding element in the third interlayer is 0.01 atomic % to 10 atomic %, and shows an absorption peak at the wave number of 950 cm-1 to 1150 cm-1 according to infrared absorption spectrum.
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