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Silicon Carbide Refractories

Silicon carbide refractories are a kind of refractory material made of SiC as the main raw material. The silicon carbide content is from 72% to 99%. Generally, black silicon carbide (SiC content above 96%) is used as the raw material, and the binder (or no binder) is added, and then it is prepared by batching, mixing, molding, and firing.

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Introduction of Silicon Carbide Refractories

Silicon carbide refractories are mainly divided into several types of clay bonding, Si3N4 bonding, Sialon bonding, β-SiC bonding, Si2ON2 bonding, and recrystallization. It is stable to acidic slag and has good wear resistance, corrosion resistance, high-temperature strength, good thermal shock stability, high thermal conductivity, and low thermal expansion coefficient. They are high-performance refractory materials.

The silicon carbide brick is made of black SiC raw material. The main crystal phase is SiC. The silicon carbide brick is formed by matching the binding agent, mixing, molding, and firing process. The moth hardness of silicon carbide brick is 9.

The silicon carbide castables do not weaken on heating and display superior operational properties: the compressive strength is 40–80 MPa at a sintering temperature of 400°C and 50–85 MPa at 1300°C, the strain onset temperature under a load of 0.2 MPa is 1700–1510°C; thermal stability (1300°C — water) is better than 45 heating/cooling cycles (1300°C — water); no change in linear and volume dimensions was observed on heating. The newly-developed castables can find application in various sectors of industry, in particular, as the refractory material for the lining of Whiting furnaces and porcelain kilns.

Properties of Silicon Carbide Refractories

1. The more SiC content, the better the alkali resistance

2. Silicon carbide in silicon carbide castables is especially advantageous at high temperatures (1100 ℃).

3. Produce partial gaps around the SiC particles to improve the thermal shock resistance and strength of the refractory castable.

4. The important chemical properties of silicon carbide are oxidation resistance, corrosion resistance, and the first reaction. When heated to 1000 ° C, the surface of SiC is oxidized and a SiC 2 film is formed. This film hinders the diffusion of oxygen, delays the oxidation rate, protects the silicon carbide covered by the film, and improves the service life of the silicon carbide material.

5. Because the substrate is SIC, silicon carbide is wear-resistant, and silicon carbide has high hardness.

6. Silicon carbide is widely used in abrasives, heating elements, structural ceramics, and refractory materials due to its high hardness, electrical conductivity, high-temperature resistance, and high strength.

Characteristics of Silicon Carbide Refractories

Corrosion resistance

Good wear resistance

High thermal conductivity

High-temperature strength

Good thermal shock resistance

Low thermal expansion coefficient

Strong corrosion resistance

Good anti-oxidation resistance

Application of Silicon Carbide Refractories

Our silicon carbide refractories are widely used as the lining of large aluminum electrolytic cells. The products can also be employed to enlarge the tank capacity, enhance the thermal conductivity, allow rapid cooling, and boost the tank production capacity at the same time. Alumina and cryolite of eutectic content on the surface can protect the tank lining work layer, and prolong the tank's service life, therefore, silicon nitride-bonded silicon carbide bricks are a welcomed product in the aluminum industry.

Package of Silicon Carbide Refractories

For Refractory Castables

1. In 1MT Big Bag

2. 25KG PP Big Bag In 1MT Big Bag

3. Customized packing as required

For Refractory Bricks

1. Wooden pallet wrapped with plastic film and bundled belts.

2. Customized packing as required

Physical Parameters

Silicon Carbide Refractories
Items	Unit		SiO2 Bonded Silicon Carbide Bricks	Azoxty-corn pounds Bonded Silicon Carbide Bricks	Mullite Bonded Silicon Carbide Bricks
Chemical Composition	SiC	%	≤18	≤18	≥10
	SiO₂	%	≤8	~	~
	Fe₂O₃	%	≤1	≤0.6	≤1
	Al₂O₃	%	≥90	≥80	≥85
Apparent Porosity	%		~	~	≥10
Bulk Density	g/cm3		≥2.56	≥2.60	≥2.56
Cold Crushing Strength	Mpa		≥80	≥100	≥70
Refractoriness under Load	℃		≥1600	≥1620	≥1550
Thermal Shock Stability （Time/850）	℃		≥40	≥40	≥35
Thermal Conductivity	w/m*k		≥8	~	~
Normal Temperature Bending Strength	Mpa		≥25	≥30	≥25
High Temperature Bending Strength1250℃*1h	Mpa		≥20	≥25	≥20
Maximum Service Temperature	℃		1400	1500	1400

Material		Silicon Carbide Refractory Castables
Max working temp.(℃)		1550	1650	1790
Bulk density after drying at 110℃, g/cm3		3	3	2.95
Chemical analysis, %	Al2O3≤	21	9	6
Chemical analysis, %	SiC+C≥	56	78	88
Cold bending strength (Mpa)	110℃*24H	12	12	18
Cold bending strength (Mpa)	1100℃*3H	15	15	20
Cold crushing strength(Mpa)	110℃*24H	80	90	120
Cold crushing strength(Mpa)	1100℃*3H	100	120	135
Linear change after heating, %	1000℃*3H	-0.2	-0.1	-0.2~0.2
Linear change after heating, %	1400℃*3H	-0.1	-0.1	-0.2~0.2
Thermal conductivity, kcal/mh, ℃		8	11	12
Water Addition		7-8%	6-7%	6-7%
Construction method		Vibration	Vibration	Vibration
Application		Garbage incinerator	Nonferrous Metal Furnaces, Cement kilns & other Industrial Furnaces	Nonferrous Metal Furnaces, Cement kilns & other Industrial Furnaces