Structural ceramic material

Zirconia/Silicon carbide/Steatite/Cordierite characteristic

Material advantages

Alumina Material Advantages:
Alumina ceramic is featured with the same crystal structure as sapphire and ruby after sintering process. This material is applied to widely diversified industrial field for its superb material characteristics such as high electrical insulation, high mechanical strength, high wear and chemical resistance.

Zirconia Material Advantages:
Excellent Strength and High Fracture Toughness:Zirconia is able to absorb the energy of impact that causes ceramic materials to shatter.
Surface Finish: Zirconia is a highly polishable material that can achieve a 2-4 microinch Ra.
Wear Resistant: Zirconia outperforms conventional components in demanding corrosive, abrasive, and erosive environments.

Silicon Carbide Material Advantages:
Silicon carbide maintains its high mechanical strength up to as high temperature as 1,400 degree. Typical application is part for mechanical seal ring and pump due to higher chemical corrosion resistance than other ceramics.

Alumina characteristic

Material Item		Alumina
Alumina content		92%	96%		97%	99%	995%
Color		white	white/red	brown	white	white	Ivory
Density	g/cm3	3.6	3.65	3.7	3.7	3.8	3.85
Water absorption	%	0	0	0	0	0	0
Vickers Hardness Load 5kg		900	1000	1100	1200	1500	1500
Flexural strength	MPa	340	350	350	360	360	370
Young’s Modulus of Elasticity	GPa	270	310	310	340	350	360
Coefficient of Linear thermal expansion(40-800)	10ˆ-6/℃	8.2	8.2	8.2	8.2	7.9	7.8
Thermal conductivity	w/(m·k)	15	22	23	24	27	30
Specific heat	KJ/(kg·k)	0.78	0.78	0.78	0.78	0.78	0.78
Dielectric strength	10ˆ6v/m	14	15	13	14	14	14
Dielectric constant	--	8.9	9.2	9.0	9.4	9.7	9.7
Main applications		Electric ceramic structural ceramic	Ceramic disc Weld ceramic Laser ceramic Electronic ceramic	Ceramic disc Sealing parts Pump plunger	Wear parts Structural ceramic	Precision ceramic Textile ceramic Ceramic crucible Laser ceramic

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Zirconia/Silicon carbide/steatite/cordierite characteristic:

Material Item		Zirconia	Silicon carbide	Steatite	Cordierite
Color		white/black	black	white/canary	white/yellow
Density	g/cm3	6.0	3.65	2.8	2.6
Water absorption	%	0	0	0	0
Vickers Hardness Load 5kg		1200	1300	-	-
Flexural strength	MPa	900	400	-	-
Young’s Modulus of Elasticity	GPa	200	400	-	-
Coefficient of Linear thermal expansion(40-800)	10-6/℃	11	4.4	8.0	1.5
Thermal conductivity	w/(m·k)	3	60	3	4
Specific heat	KJ/(kg·k)	0.46	0.67	0.73	0.73
Dielectric strength	10ˆ6v/m	-	-	18	19
Dielectric constant	--	-	-	6	4.8
Main applications		Precision ceramic Sealing parts Structral ceramic Crucible Pad printer ring	Sealing parts Nozzle	Electronic ceramic Lighting head light holder igniter	Welding ferrule Refractory

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