Alumina-titanium calcium aluminate-silicon carbide multiphase refractory material and preparation method thereof

Abstract

The invention relates to an alumina-titanium calcium aluminate-silicon carbide multiphase refractory material and a preparation method thereof. According to a technical scheme in the invention, 40 to 45 wt% of special alumina particles, 20 to 30 wt% of fine special alumina powder, 10 to 20 wt% of titanium calcium aluminate particles, 4 to 9 wt% of silicon carbide particles, 4 to 9 wt% of fine silicon carbide powder, 1 to 2 wt% of elemental silicon, 2 to 5 wt% of fine powder of active alpha-Al2O3, 2 to 6 wt% of fine powder of white clay produced in Guangxi Province and 0.5 to 1.5 wt% of fine Y2O3 powder are used as raw materials, a binder accounting for 3 to 4 wt% of the raw materials is added, and mixing and milling are carried out so as to obtain a mixture; and then the mixture is subjected to ageing, mechanical pressing, demoulding, standing, drying, retention at 1400 to 1530 in an air atmosphere in a muffle furnace for 180 to 240 min, and cooling in the furnace successively so as to prepare the alumina-titanium calcium aluminate-silicon carbide multiphase refractory material. The preparation method provided by the invention is low in cost, simple in process and high in yield; and the prepared alumina-titanium calcium aluminate-silicon carbide multiphase refractory material has great volume density, great flexural and compression strength, low heat conduction coefficient and excellent thermal shock resistance.

Description

technical field [0001] The invention belongs to the technical field of alumina-silicon carbide composite refractory materials. Specifically relates to an alumina-calcium aluminate titanate-silicon carbide composite refractory material and a preparation method thereof. Background technique [0002] With the consumption of natural ore raw materials and the accumulation of a large amount of waste slag produced by various smelting industries, it is of great significance to replace super-grade bauxite with calcium aluminate titanate to prepare refractory materials. At present, various products such as high alumina bauxite bonded silicon carbide, mullite bonded silicon carbide and sialon bonded silicon carbide are mainly used in the transition zone of cement rotary kiln; such as "a mullite silicon carbide composite refractory material and Its preparation method" (CN201610637867.7) patented technology, using mullite, silicon carbide, bauxite and andalusite as raw materials to prep...

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Problems solved by technology

At present, various products such as high alumina bauxite bonded silicon carbide, mullite bonded silicon carbide and sialon bonded silicon carbide are mainly used in the transition zone of cement rotary kiln; such as "a mullite silicon carbide composite refractory material and Its preparation method" (CN201610637867.7) patented technology, using mullite, silicon carbide, bauxite and andalusite as raw materials to prepare mullite silicon carbide composite refractory materials, although the thermal conductivity of the material is reduced, it is beneficial to cement Energy saving and heat preservation of rotary kiln, but more lightweight mullite aggregates are introduced, which greatly increases the cost of materials, and the thermal shock resistance of materials is not good; and its preparation method" (CN201410444238.3) patented technology, by replacing the current shortage of special-grade or first-grade bauxite with three-grade high-alumina bauxite, although the production cost is reduced, the prepared phosphate combined with low-alumina silica The apparent porosity is too large and the strength is not high