Sintered polycrystalline composite materials based on boron...

Details Sintered polycrystalline composite materials based on boron... Sintered polycrystalline composite materials based on boron...

C - Chemistry, Metallurgy

04

B

261/1, 22/57

C04B 35/58 (2006.01) B22D 11/047 (2006.01) C04B 35/583 (2006.01)

Patent

CA 1240711

ABSTRACT OF THE INVENTION The invention is sintered polycrystalline composite materials based on boron nitride useful as brearings in the horizontal continuous casting of steel. These composite materials are produced by hot-pressing powder mixtures of hexagonal boron nitride and from 1 to 70% by weight of oxide(s), based on the total weight of the mixture, selected from the group consisting of zirconium oxide, magnesium oxide, aluminium oxide and silicon oxide, at temperatures in the range of from 1600 to 2000°C under a pressure of from 7 to 20 MPa. The preferred starting materials are boron nitride powders having an oxygen content of from 6 to 10% by weight and a specific surface area of from 5 to 30 m2/g (measured according to the BET method) and oxide powders, individually or in admixture, each having a purity > 97%.

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