Preparation method of locally-reinforced high-toughness boron nitride-based ceramic side sealing plate for thin-strip continuous casting

Abstract

The invention discloses a preparation method of a locally-reinforced high-toughness boron nitride-based ceramic side sealing plate for thin-strip continuous casting, and relates to a preparation method of a side sealing plate. The invention aims to solve the problem that the overall service life of the side sealing plate is affected due to the fact that the side sealing plate for thin-strip continuous casting prepared from a homogeneous material in the prior art has the same overall performance and cannot meet the difference requirement of each area on the service performance. The locally-reinforced high-toughness boron nitride-based ceramic side sealing plate prepared by the invention has the characteristic of excellent comprehensive service performance, and the whole side sealing plate does not have a fracture phenomenon after high-temperature and low-temperature thermal shock at 600-1400 DEG C. The side sealing plate after thermal shock is sampled in each area for characterization, the thermal shock residual strength retention rate of an area C is 85% or above, and the average residual strength is greater than 120 MPa; and the friction and wear resistance of the zone B is relatively improved, the friction coefficient is 0.15-0.20, and the wear rate is lower than 0.03%.

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