Sintered compact for use in a tool and the method for producing

Details Sintered compact for use in a tool and the method for producing Sintered compact for use in a tool and the method for producing

1982-02-17

1983-06-21

Bell, Mark

Stock material or miscellaneous articles

Composite

Of inorganic material

428457, 501 98, 51309, 264 65, C04B 3558

Patent

active

043894658

ABSTRACT:
The invention relates to a sintered compact for use in an ultrahard tool having high resistance to heat and wear, outstanding thermal conductivity and thermal shock resistance property at elevated temperature, and suitable for high-speed cutting, and to a method for producing the same. A powder mixture comprising 20-80 volume % high pressure form boron nitride powder, the residual part consisting of Al.sub.2 O.sub.3 powder or a compound ceramic powder principally comprising Al.sub.2 O.sub.3 powder and also containing carbides, nitrides of IVb, Vb, VIb metals of the periodic table, mutual solid solution thereof or admixture thereof, is sintered as it stands or after pressing under a high pressure and a high temperature so that Al.sub.2 O.sub.3 of the compound ceramic constitutes a continuous phase in the structure of the sintered compact, and the half width of (116) in the X-ray diffraction of CuK.alpha. ray of Al.sub.2 O.sub.3 crystals in the structure constituting the continuous phase is within the range from 0.200 deg. to 0.600 deg., thereby enabling to obtain a sintered compact for use in a tool having the aforesaid high properties.

REFERENCES:
patent: 2888355 (1959-05-01), Taylor
patent: 3151994 (1964-10-01), Adlassing
patent: 3767371 (1973-10-01), Wentorf et al.
patent: 3850053 (1974-11-01), Bovenkerk
patent: 3852078 (1974-12-01), Wakatsuki et al.
patent: 3854967 (1974-12-01), Reinmuth
patent: 3944398 (1976-03-01), Bell
patent: 4007049 (1977-02-01), Rossi et al.
patent: 4186022 (1980-01-01), Ordanian et al.
patent: 4224380 (1980-09-01), Bovenkerk et al.

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