Aluminum chromium zirconia fire resistive material for producing abrasion-proof prefabricated component

Abstract

The invention relates to an aluminum-chromium-zirconium refractory material for preparing wear-resistant prefabricated parts. The raw materials for its preparation include the following raw materials in weight percentages: 55-75% of fused corundum with a particle size of 0.044-8 mm, and partially stabilized zirconia with a particle size of 0.21-0.044 mm. 5-20%, 0.030-0.040mm chromium oxide 3-8%, Al2O3≥70% pure calcium aluminate cement 3-10%, ρ-alumina micropowder 1-8%. The refractory material has strong thermal shock resistance, enhanced slag resistance, enhanced wear resistance and impact resistance, which greatly reduces the large-area structural spalling of the refractory material due to temperature changes, and has a small thermal expansion coefficient and low thermal conductivity. , Extended service life.

Description

technical field [0001] The invention relates to a refractory material, in particular to an aluminum-chromium-zirconium refractory material for preparing a wear-resistant preform. Background technique [0002] Wear-resistant prefabricated parts are mostly made of aluminum-chromium refractory materials, and aluminum-chromium refractory materials are mainly made of Al 2 o 3 and Cr 2 o 3 Composed of two components, these two substances can form an infinite solid solution after high temperature sintering, have good chemical stability, wear resistance and high softening temperature under load, can resist high temperature gas erosion, and have high hardness. It is resistant to high temperature oxidation, and has a good effect in neutral and acidic slag. Because aluminum-chromium refractories have many excellent properties, they have been widely used in metallurgy and industrial furnaces. However, the thermal shock resistance of aluminum-chromium refractory materials is poor, a...

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Problems solved by technology

However, the thermal shock resistance of aluminum-chromium refractories is poor, and it is easy to form cracks and peel off when used in environmental conditions with severe temperature changes (rapid cooling, rapid heating), resulting in a greatly shortened service life

These unfavorable factors limit the application range of aluminum-chrome refractories: they can only be used in places where the temperature does not change drastically, such as tapping platform bricks for heating furnaces

Chinese patent document CN1136164C discloses an aluminum-chromium refractory material, but its refractory strength, wear resistance and shock resistance and other indicators cannot meet the requirements for preparing wear-resistant prefabricated parts for hot furnaces.

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