A pillar brick used for wear-resistant ceramics and a preparing method thereof

Abstract

A pillar brick used for wear-resistant ceramics and a preparing method thereof are disclosed and belong to the technical field of refractory materials. The pillar brick and the method are characterized in that that pillar brick is prepared from, by weight, 27-29 parts of alumina powder, 0.7-2.1 parts of silica fume, 5-6 parts of plate-shaped emery powder, 33-37 parts of white fused alumina particles having a size of 60 meshes, 5-6 parts of fused mullite having a size of 14-150 meshes, 2.5-3.5 parts of a binder, and 3.4-4.7 parts of a suspending agent. The preparing method includes mixing the white fused alumina, the fused mullite, the binder and water by stirring, adding the alumina powder, the silica fume, the plate-shaped emery powder and the suspending agent, mixing by stirring, sealing the mixed materials, fermenting for 20-30 h, performing compression moulding, drying and firing at a low temperature. Mainly through component matching and particle size matching, the pillar brick after being fired forms a special surface crystal phase, and a low apparent porosity and high compressive strength can be maintained in long-term repeated heating and cooling.

Description

technical field [0001] A pillar brick for wear-resistant ceramics and a preparation method thereof belong to the technical field of refractory materials. Background technique [0002] The pillars are mainly used for high-temperature firing of wear-resistant ceramic balls or lining bricks, supporting the shed board on the kiln car of the tunnel kiln. The number of layers can be increased according to the demand, and the space in the kiln can be fully utilized to save energy and increase production. The main components of the current pillars are silicon nitride and silicon carbide, but when the current pillars are used at high temperatures, a glass phase will be generated and a large number of bubbles will be generated. These bubbles will bond to the product and generate a lot of waste products. [0003] The main reasons for the increase in the product rejection rate caused by the current pillars are as follows. [0004] Silicon carbide materials have a very thin, dense, and ...

AI Technical Summary

Problems solved by technology

This layer of film will generate air bubbles with the increase of use time. Due to the continuous temperature rise and fall during use, the amount of air bubbles will continue to increase. When the product is loaded on the kiln car and contacts the pillars, the air bubbles will adhere to the surface of the product and even penetrate into the surface of the product. Inside the product, resulting in a 10% to 30% increase in product scrap rate

[0005] Secondly, the existing pillars are formed by pressing during the production process, and the structure density of the upper and lower parts of the product is not uniform. Nitrogen gas needs to be added to sinter during the firing process. It is difficult to ensure the uniformity of the product under the condition of the same nitriding rate.

Cause a large number of defects in the product and reduce the fracture toughness of the product

[0006] Finally, it is difficult to remove the black bubbles after being bonded to the white product, requiring a lot of manual polishing. After a large area is abolished, it is difficult to reuse it, resulting in energy waste

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