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Amorphous periclase-silicon carbide composite fireproof materials and method for preparing same

A refractory material and production method technology, applied in the field of amorphous periclase-silicon carbide refractory material and its production, can solve the problems of low strength, achieve high thermal conductivity, improve oxidation resistance, and improve the effect of medium temperature strength

Inactive Publication Date: 2005-08-17
WUHAN UNIV OF SCI & TECH
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Problems solved by technology

In addition, the medium temperature (e.g., 1000 °C) strength of resin-bonded MgO-C materials is low due to the carbonization of the resin

Method used

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Embodiment Construction

[0007] A production method of amorphous periclase-silicon carbide composite refractory material, which uses fused magnesia, silicon carbide and silicon oxide micropowder as raw materials; mixes 65-90% fused magnesia particles and fine powder by weight percentage , 10-35% of silicon carbide particles and fine powder, plus 4-7% of silicon oxide powder mixed evenly. Among them, the particle size of fused magnesia is between 8-10mm, the particle size of fine powder is between 88-5um, the particle size of silicon carbide is 3-10mm, and the particle size of fine powder is between 100-3um. The mixed weight percentages of fused magnesia, silicon carbide particles and fine powder are 40-60% for particles and 40-60% for fine powder.

[0008] Add 4-6% of water and 0.2-0.8% of water reducer during construction and forming. After stirring evenly, adopt vibration pouring method to form. The formed product is baked at a temperature of 110-180° C. for 20-24 hours to obtain a product with a n...

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Abstract

The present invention relates to one kind of amorphous periclase-SiC refractory material and it production process. The technological scheme includes mixing fused magnesia or sintered magnesia in 50-90 wt%, silicon carbide in 10-50 wt% and fine silica powder in 3-8 wt%; adding water in 4-8 wt% and water reducing agent in 0.1-3 wt% during construction; and forming through stirring, vibration depositing, and roasting at 100-300 deg.c for 2-24 hr. The produced amorphous composite refractory material has high smelting point, high heat conductivity, and especially self-protecting oxidation characteristic, which is that the oxidized SiC forms one layer of protecting silica film to protect the inside from being further oxidized. The present invention substitutes SiC for graphite to raise the antioxidant performance of the material greatly and using fine silica powder as binding agent makes the material possess raised medium temperature strength.

Description

1. Technical field [0001] The invention belongs to the technical field of unshaped refractory materials. In particular, it relates to an amorphous periclase-silicon carbide refractory material and a production method thereof. 2. Background technology [0002] Oxide-non-oxide composite materials are an important direction for the development of refractory materials. MgO-C refractory material has become an important refractory material used in the iron and steel industry. It is made of magnesia and graphite with resin as a binder. Since graphite is not wetted by slag and has high thermal conductivity, carbon composite refractories have good slag resistance and thermal shock stability. However, carbon composite refractories have a weakness that is difficult to overcome, that is, poor oxidation resistance (edited by Zhang Wenjie, Li Nan. Carbon composite refractory materials. Science Press.). The bonded carbon formed by the carbonization of graphite and binder is easily oxidi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/04C04B35/584C04B35/622C04B35/66
Inventor 李楠
Owner WUHAN UNIV OF SCI & TECH
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