Silicon Carbide Seals

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Silicon Carbide Seals

Silicon carbide is the ideal sealing material. It has good corrosion resistance, higher mechanical intensity, excellent resisting wear ability and high temperature, good self-lubricity and making-group, low friction factor, good heat-conduction and so on. Therefore, silicon carbide seals also possess the property of excellent resistant-corrosion, high mechanical strength, high thermal conductivity and good self-lubrication. Silicon carbide seals are widely used in many different industries, including spacecraft, machinery, metallurgy, printing and dyeing, foodstuff, pharmaceutical, auto industry etc.

Why make from silicon carbide?
Silicon carbide is a more expensive seals material with the carbon, but it is often used in more demanding applications. For example, blistering is a critical concern with carbon bearing materials. Strangely, the reason why blistering sometimes occurs is not known for certain. The most popular explanation is that a certain amount of material becomes absorbed in the carbon substrate and expands because of frictional heat, thus creating a crater in the seals face. Blistering is most often found in applications involving heavy oils. In some cases, the use of silicon carbide as a mating surface will eliminate a blistering problem.

Silicon Carbide (SiC) physical property
Technical parameter	Unit	RBSiC	SSiC	Sic+C	Ssic+C	Qssic+C
Content of Sic	%	≥90	≥98	≥85	≥92	≥90
Free Si	%	≤10	≤1	≤12	/	/
Elastic Modulus	GPa	≥400	≥410	≥350	≥360	≥180
Temperature	°C	1300	1400	1300	1400	1400
Hardness	HS	110	115	≥105	≥110	≥100
Porosity Rate	%	<0.3	<0.2	<0.5	<0.5	<5
Density	g/cm3	3.00~3.05	>3.10	2.69-2.90	2.70-3.0	2.65
Compressive Strength	MPa	>2200	>2500	>1400	>1600	>800
Fractural Strength	MPa	>350	>380	>150	>160	>100
Coefficient of Heat Expansion	10-6/°C	4	4.2	3.50	3.00	2.50