They have the property of excellent resistant-corrosion,high mechanical strength,high thermal conductivity,good self-lubrication,used as seal faces,bearings and tubes in spacecraft,machinery,metallurgy,printing and dyeing,foodstuff,phamaceutical,auto industry and so on.When the sic faces are combined with graphite faces the friction is the smallest and they can be made into mechanical seals which are able to work in highest working requirements.
SiC physical property
Technical Parameter	Unit	SiC	SSiC
Hardness	HS	110	115
Porosity Rate	%	<0.3	<0.2
Density	g/cm3	3.00~3.05	>3.10
Compressive Strength	MPa	>2200	>2500
Fractural Strength	MPa	>350	>380
Coefficient of Heat Expansion	10-6/oC	4	4.2
Content of Sic	%	≥90	≥98
Free Si	%	≤10	≤1
Elastic Modulus	GPa	≥400	≥410
Temperature	oC	1300	1400