Coating processes – Particles – flakes – or granules coated or encapsulated – Inorganic base
Patent
1979-01-25
1980-09-02
Lesmes, George F.
Coating processes
Particles, flakes, or granules coated or encapsulated
Inorganic base
106 43, 106 56, 264 81, 427249, 427369, 4273761, B05D 724
Patent
active
042206774
ABSTRACT:
The proposed polycrystalline superhard material comprises sintered particles of cubic boron nitride coated over the whole surface thereof with a layer of a crystalline compound of the chemical formula B.sub.x N.sub.y C.sub.z, where x, y and z can assume any value from 0 to 1, said compound binding together the particles of the cubic boron nitride.
According to the present invention the proposed material is produced in the following way: particles of cubic boron nitride are placed in a flow of a gas containing carbon for a carbon layer 1-100 A thick to be built up on the whole surface of said particles. Then the particles of cubic boron nitride with the carbon layer built up over the whole surface of the particles are subjected to sintering at a temperature and under a pressure corresponding to the region of thermodynamic stability of cubic boron nitride.
The herein-proposed material is highly uniform and features mechanical properties superior to those of the known cubic boron nitride materials. Thus, for example, under the identical conditions of cutting, durability of cutters made from the proposed material is 2-5 times higher than that of the cutters made from the known material based on cubic boron nitride.
REFERENCES:
patent: 3351690 (1967-11-01), Stover
patent: 3852078 (1974-12-01), Wakatsuki et al.
Samsonov et al., "Boron Carbonitride as a High-Temperature Electrically Ilating Refractory Material", in Chemical Abstracts, vol. 78, 127866c (1978), p. 228.
Andreeva et al., "Electrically Insulating Materials for Linings and Holders of High-Pressure Chambers", in Chemical Abstracts, vol. 84, 160911y, (1974), p. 514.
Bakul Valentin N.
Deryagin Boris V.
Fedoseev Dmitry V.
Gerasimenko Valentin K.
Nikitin Jury I.
Adams Bruce L.
Burns Robert E.
Institut Sverkhtverdykh Materialov Akademii Nauk Ukrainskoi SSR
Lesmes George F.
Lobato Emmanuel J.
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