Special micro-expansion corundum wear-resistant coating for waste heat air pipe

Abstract

The invention belongs to the technical field of wear-resistant coatings, and particularly relates to a special micro-expansion corundum wear-resistant coating for a waste heat air pipe. A wear-resistant aggregate is used, a composite expanding agent and a plastic sintering aid are newly added, and an arc-shaped scraping frame is used for compacting the wear-resistant coating, so that the effect that the wear-resistant coating can be stably attached to the hexsteel for a long time is achieved. Compared with the prior art, the invention has the following advantages that firstly, the wear-resistant aggregate containing corundum and silicon carbide provides enough wear resistance for the final lining layer, and the plastic sintering aid containing clay and boron gangue provides enough integrity for the final lining layer, so that the self-crushing time of the lining layer is prolonged; and secondly, kyanite and silica have the heated micro-expansion performance, actively expand and are clamped in the hexsteel, and the whole block is not prone to falling off.

Description

technical field [0001] The invention belongs to the technical field of wear-resistant coating materials, and in particular relates to a micro-expansion corundum-based wear-resistant coating specially used for waste heat air ducts. Background technique [0002] In many industries such as cement, metallurgy, electric power and petrochemical, most heat treatment and heat processing equipment require pipes with considerable heat resistance and wear resistance. The typical one is the waste heat air pipe, and its lining material includes tortoise shell Mesh and abrasion resistant coatings. [0003] But on the other hand, the existing ordinary wear-resistant coatings are prone to the following problems when forming the lining of the waste heat air duct: first, the air duct contains a large amount of particle dust, and the high-temperature dust-laden gas impacts and wears away for a long time coating, there will be serious wear and tear of the wear-resistant coating, and the proble...

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Problems solved by technology

[0003] But on the other hand, the existing ordinary wear-resistant coatings are prone to the following problems when forming the lining of the waste heat air duct: first, the air duct contains a large amount of particle dust, and the high-temperature dust-laden gas impacts and wears away for a long time coating, there will be serious wear and tear of the wear-resistant coating, and the problem that the service life is not up to standard; second, the existing ordinary wear-resistant coating shrinks at high temperature, so the combination of the wear-resistant coating and the tortoise shell net is not tight, and the wear-resistant coating will fall off the tortoise shell net in one piece

[0007] However, the castable in this invention patent has general stability in a high temperature environment. The main materials such as mullite, silicon carbide, and ferrochrome slag do not have the characteristics of thermal expansion, and the castable as a whole lacks proper thermal stability. The thermal expansion effect is the same as the existing ordinary castables, which shrink when heated, so when used on tortoise shell nets, there will be a problem of shrinkage and drop of castables in a relatively short period of time

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