Periclase-silicon carbide composite materials and method for preparing same

A composite material, silicon carbide technology, applied in the field of refractory materials, can solve problems such as low strength, achieve high thermal conductivity, high melting point, and improve the effect of medium temperature strength

Inactive Publication Date: 2005-08-17
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
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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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Experimental program
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Embodiment Construction

[0009] A periclase-silicon carbide composite material and a preparation method thereof. According to the percentage by weight, 70-90% of fused magnesia particles and fine powder, 10-30% of silicon carbide particles and fine powder, and 3-5% of phenolic resin and silicon dioxide powder binder and additional 0.1-0.8% of hexamethylenetetramine is mixed as a curing agent. Among them: the weight percentage of silicon dioxide micropowder is 10-70% of the total binder; the particle size of fused magnesia is between 8-10mm, the particle size of fine powder is between 5-88um, and the The particle size is between 3-10mm, and the fine powder particle size is between 3-100um. The weight percentages of the granule and the fine powder are respectively: 35-70% for the granule and 30-65% for the fine powder.

[0010] Stir evenly after mixing, press and shape on a press, and bake at 200-300°C for 18-24 hours. The periclase-silicon carbide composite refractory material with normal temperatur...

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Abstract

The present invention relates to one kind of periclase-silicon carbide composite material and its preparation. The technological scheme includes mixing fused magnesia or sintered magnesia in 60-90 wt%, silicon carbide in 10-40 wt% binding agent in 3-8 wt%, hexamethine tetramine as curing agent in 0-1 wt% through stirring; pressing and forming the mixture; and stoving at 110-350 deg.c for 2-24 hr to prepare the composite material. The prepared composite 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 material greatly and the material has raised medium temperature strength, so that the material may be used as lining material for metallurgical furnace and container.

Description

1. Technical field [0001] The invention belongs to the technical field of refractory materials. In particular, it relates to a periclase-silicon carbide composite material and a preparation 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 oxidized by oxygen in the...

Claims

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Application Information

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