Refractory Silicon Carbide Brick

Silicon nitride bonded silicon carbide brick is a high-grade refractory material with silicon carbide sand as the main raw material and silicon nitride as the binding phase. Since SiC and Si3N4 are covalent bond compounds, sintering is difficult, and they are usually prepared by reaction sintering in industrial production. Using SiC as aggregate, adding metal silicon powder, choosing reasonable particle grading, kneading system and forming process, the dried green body is fired in a special firing equipment in a nitrogen atmosphere. During the firing process, the generated Si3N4 (matrix binding

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Refractory Silicon Carbide Brick Details

Features

Silicon carbide brick not only has the characteristics of high density, high strength, good thermal shock stability, high load softening point, good thermal conductivity, high resistance value, etc., but also has excellent resistance to cryolite, aluminum fluoride, sodium fluoride and calcium fluoride, etc. Melt corrosion and oxidation resistance.

Applications

1. Building and sanitary ceramics industry. At present, in the firing of ceramic products, most of them use roller kilns to fire sanitary ceramics and wall and floor tiles, and the rollers of roller kilns are basically made of silicon nitride and silicon carbide.
2. Household ceramics industry
3. Electric porcelain and electronic ceramic industry
4. Aluminum smelting, copper, zinc and other industries
5. Steel-making and steel-rolling industry. The application of new technologies and processes for steel-making has put forward higher requirements for refractory materials used in ladles, and the lining of ladles has changed from the high-alumina bricks that dominated in the past to better corrosion resistance. The material silicon nitride bonded silicon carbide material
6. Ironmaking industry. In recent years, silicon nitride combined with silicon carbide bricks for blast furnaces has developed rapidly, and about 61% of blast furnaces abroad have adopted them, especially 68% of large blast furnaces with a hearth diameter of 12-15m.
7. Metal heat treatment industry, etc.

Physical And Chemical Indicators

Brand Properties		Ntri-SiC Brick	Oxide-SiC Brick 90	Oxide-SiC Brick 80	HA-SiC Brick
Bulk Density (g/cm3)		2.65	2.5	2.4	2.65
Apparent Porosity (%)		16	17	18	22
Cold Crushing Strength (MPa)		130	100	80	90
Refractoriness Under Load (℃) @0.2MPa		1700	1650	1550	1680
Thermal conductivity (W/m.k)		18	15	14	--
Chemical Analysis (%)	SiC	73-81	90	80	10
	Si3N4	16-25	--	--	--
	Fe2O3	0.3	0.8	1.0	65 Al2O3
Main Applications		Copper Furnace Alumina Furnace ceramic kiln shelf panels Incineration furnace

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