Porous silicon nitride ceramic guide roller and preparation method thereof

Abstract

The invention discloses a porous silicon nitride ceramic guide roller and a preparation method thereof. The porous silicon nitride ceramic guide roller comprises a first roller body and a second roller body; the second roller body is matched with the first roller body; the first roller body is a metal cylinder; and the second roller body is a porous silicon nitride ceramic cylinder. In the porous silicon nitride ceramic guide roller, the porous silicon nitride ceramic cylinder coats the machined metal cylinder, and is matched with the machined metal cylinder through high-temperature compound glue; a porous silicon nitride ceramic material has such excellent performances as light mass, high-temperature resistance, strain resistance, damage resistance and thermal shock resistance; and heat is isolated and dissipated through porous silicon nitride ceramic compounded on the surface of the guide roller, so that the heat concentration is prevented.

Description

technical field [0001] The invention belongs to the technical field of guide rollers, in particular to a porous silicon nitride ceramic guide roller and a preparation method thereof. Background technique [0002] Porous ceramic material refers to a ceramic material that is fired at high temperature and has interlinked or closed pores in the body. As a new type of functional ceramics, porous ceramics have been widely used in the fields of chemical industry, energy, environmental protection, metallurgy, electronics and biology, as filtration, separation, gas distribution, sound absorption, catalyst carrier and bioceramics. [0003] During the wire rolling process, the steel billet passes through the guide device at a relatively high temperature (900-1250°C) and at a high speed (above 50m / s). Cooling water with a certain pressure is sprayed on the surface. Therefore, at a relatively high temperature, the guide device not only has to bear the shock of rapid cooling and heat, b...

AI Technical Summary

Problems solved by technology

Therefore, at a higher temperature, the guide device must not only bear the shock of rapid cooling and heat, but also bear the impact load imposed by sliding friction and wear and the entrance of the billet. The working conditions are very harsh. When the heat dissipation of the guide roller is not smooth, It is easy to cause loss or even failure of the guide roller

[0004] At present, most of the guide rollers are made of heat-resistant steel and other metal materials. Due to the low hardness and wear resistance of metals at high temperatures, and poor chemical stability at high temperatures, high-temperature wear failures and steel-bonding failures will occur during the use of guide rollers. , strain failure, thermal fatigue and thermal crack failure and other failure forms

In addition, due to the high density of the metal, the heavy guide roller will generate a lot of stress on the bearing installed inside it during high-speed rotating motion, which may easily cause the failure of the bearing