Chromium zirconium mullite refractory material and preparation method thereof

Abstract

The invention relates to a chromium zirconium mullite refractory material and a preparation method thereof. The chromium zirconium mullite refractory material takes fused mullite or sintered mullite as an aggregate and takes zirconite powder, corundum powder and chromium oxide green as product matrix parts. The raw materials of the refractory material comprise 65% of mullite, 10% of corundum powder, 15% of zirconite powder and 10% of chromium oxide green by weight. The sintered chromium zirconium mullite refractory product is mainly used in glass melting furnaces, glass fiber melting furnaces and steel and chemical kilns, and has the high temperature use characteristics of excellent thermal shock resistance, strong high temperature cracking and slag resistance, no stripping and the like.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a chromium-zirconium mullite refractory material and a preparation method thereof. Background technique [0002] Mullite (usually composed of 3Al 2 o 3 2SiO2 2 ) is the SiO 2 -Al 2 o 3 The only stable crystal in a two-phase system and one of the most common industrial ceramics. Because mullite has excellent high temperature strength, creep resistance, low thermal expansion coefficient, good dielectric properties, high transmittance in the mid-infrared region, good chemical stability and thermal stability, and can be maintained at elevated temperatures It has excellent mechanical properties and stability in oxidizing atmosphere, and it has important application prospects in electronics, optics and high temperature structures. [0003] Chromium-zirconium-mullite refractory products are a kind of refractory products developed mainly for problems that ...

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Problems solved by technology

[0005] At present, domestic glass furnace tongue bricks mainly use fused zirconia corundum bricks and fused rebonded corundum mullite bricks (1) Fused zirconia corundum bricks are due to their very dense structure and the presence of a large amount of zirconia and corundum in the bricks. , so that it has strong corrosion resistance, but when it is used on the tongue, the temperature fluctuation is relatively frequent and the crystal changes inside the brick (zirconia appears monoclinic tetragonal crystal transformation at about 1100-1200 ° C), the brick body is affected The impact of thermal stress causes it to burst and even fall off (some have already occurred in the kiln) seriously affecting the service life

(2) Compared with electric fused bricks, fused and recombined corundum mullite bricks are not as strong in corrosion resistance as fused bricks, but they have good thermal shock resistance and will not fall off. There are alkaline substances during use Erosion and spalling of bricks will affect the service life

[0007] In recent years, domestic glass manufacturers have begun to use a large amount of cheap petroleum coke powder and coal powder in the selection of fuel, but this fuel will produce a large amount of alum pentoxide, disulfur trioxide and other substances during combustion, which will cause damage to the brick body. Severe erosion, some kilns have to be shut down for maintenance after only 3 months

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