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Abstract

A body coated with cubic boron nitride comprises: a base material; a first interlayer of nitride or boride with which at least one element of IVb group, IIIb group, Vb group, IVa group, Va group and VIa group of the periodic table, in accordance with the quality of the material of the base material is mixed, and the composition ratio of the at least one element is decreased towards the surface, the first interlayer being formed on the base material; and/or a second interlayer of nitride or boride with which at least one element of IVb group, IIIb group, Vb group, IVa group, Va group and VIa group of the periodic table, in accordance with the quality of the material of the base material is mixed at the total mixing amount 0.01 atomic % to 10 atomic %, and shows an absorption peak at the wave number of 950 cm.sup.-1 to 1150 cm.sup.-1 according to the infrared absorption spectrum, the second interlayer being formed on the first interlayer or the base material; and a cubic boron nitride film which shows the maximum absorption peak at the wave number of 950 cm .sup.- 1 to 1150 cm.sup.-1 according to the infrared absorption spectrum, the cubic boron nitride film being formed on the first interlayer or the second interlayer. Or a body coated with cubic boron nitride comprises: a base material; a first interlayer of nitride or boride which includes at least one element of IVb group, IIIb group, Vb group, IVa group, Va group and VIa group of the periodic table, in accordance with the quality of the material of the base material, the first interlayer being formed on the base material; a second interlayer of nitride or boride with which at least one element of IVb group, IIIb group, Vb group, IVa group, Va group and VIa group of the periodic table, in accordance with the quality of the material of said base material is mixed, and the composition ratio of the at least one element is decreased towards the surface, the second interlayer being formed on the first interlayer; a third interlayer of nitride or boride with which at least one element of IVb group, IIIb group, Vb group, IVa group, Va group and VIa group of the periodic table, in accordance with the quality of the material of the base material is mixed at the total mixing amount of 0.01 atomic % to 10 atomic %, and shows an absorption peak at the wave number of 950 cm.sup.-1 to 1150 cm.sup.-1 according to the infrared absorption spectrum, the third interlayer being formed on said second interlayer; and a cubic boron nitride film which shows the maximum absorption peak at the wave number of 950 cm.sup.-1 to 1150 cm.sup.-1 according to the infrared absorption spectrum, the cubic boron nitride film being formed on said third interlayer. And a method for manufacturing a body coated with cubic boron nitride comprises the steps: of preparing a base material in a vacuum chamber; of preparing elements of at least one of IVb group, IIIB group, Vb group, IVa group, Va group and VIa group of the periodic table, being able to form a compound with boron and nitrogen, or the compound of the at least one group; of introducing the elements or compound into the vacuum chamber under the control of the evaporation rate or supply rate of the elements or compound, and concurrently under the control of the evaporation rate of boron; and a forming an interlayer of nitride or boride having a predetermined chemical composition between the base material and a cubic boron nitride film.

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