Large boron nitride abrasive particles

Details Large boron nitride abrasive particles Large boron nitride abrasive particles

1977-01-21

1980-11-04

Parrish, John A.

Plastic and nonmetallic article shaping or treating: processes

Applying explosive force to make article

423290, C04B 3558

Patent

active

042319803

ABSTRACT:
Hard boron nitride particles of wurtzite and zincblende crystal structure of larger than 50 microns particle size are formed by subjecting recrystallized pyrolytic boron nitride to dynamic shock treatment to create pressures and temperatures in which the stable form of boron nitride has a wurtzite or zincblende crystal structure.

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patent: 3851027 (1974-11-01), Balchan
patent: 3876751 (1975-04-01), Alexeevsky et al.
Physics Today, "Flash X-Ray Technique Studies Crystals during Shock Wave", pp. 17-18, Feb. 1973.
Johnson et al., "First X-Ray Diffraction Evidence for a Phase Transition during Shock-Wave Compression," Physical Review Letters, vol. 29, No. 30, Nov. 1972, pp. 1369-1372.
Bundy et al., "Direct Transformation of Hexagonal Boron Nitride to Denser Forms," J. Chem. Physics, vol. 38, No. 5, pp. 1144-1149, Mar. 1, 1963.
P. S. DeCarli, "Shock Wave Synthesis of Adamantine Boron Nitride Phases", Bull., Am. Phys. Soc. II, 12,1127 (1967).
Coleburn, N. L. & Forbes, J. W. "Irreversible Transformation of Hexagonal Boron Nitride by Shock Compression", J. Chem. Phys. 48,555 (1968).
Batsanov, S. S. et al., "The Effect of Explosion on a Substance-The Formation of Dense Forms on Boron Nitride" Magazine of Structural Chemistry, 9, 1968.
Dulin, I. N. et al., "Phase Transformation of Boron Nitride During Dynamic Compression", Fiz. Tverd. Tela, 11, 1252 (1969).

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