Ceramic Components

Custom ceramic components are available through Hi-Tech Seals. Hi-Tech Seals most popular ceramic materials are Zirconia compounds.

Zirconia ceramics benefits:

Excellent strength and high facture toughness
Surface finish from 2-4 microinch Ra
Thermal stability capable of tolerating thermal gradients better than many high temperature materials
Wear resistance in corrosive, abrasive and erosive environments

Applications:

Properties:

Property	Units	Test	Compound 1	Compound 2
Colour			Ivory	Grey
Density	gm/cc	ASTM-C20	6.05	6.07
Crystal Size	Microns	Thin-Section	1	1
Water Absorption	%	ASTM-373	0	0
Gas Permeability			0	0
Flexural Strength (MOR), 20^oC	--	--	1240 (180)	1720 (250)
Elastic Modulus, 20^oC	GPa (psi x 10⁶)	ASTM-F417	210 (30)	210 (30)
Poisson's Ratio, 20^oC	--	ASTM-C848	0.23	0.23
Compressive strength	MPa (psi x 10³)	ASTM-C773	2500 (363)	2500 (363)
Hardness	GPa (kg/mm²)	KNOOP 1000 gm	12.7 (1300)	12.7 (1300)
		Rockwell 45N	81	81
Tensile Strength, 25^oC	MPa (psi x 10³)	ACMA Test #4	--	--
Fracture Toughness K(lc)	MPa m^1/2	Notched Beam	13	13
Thermal Conductivity, 20^oC	Wm degrees K	ASTM-C408	2.2	2.2
Coefficient of Thermal Expansion, 25-1000^oC	1 x 10^-6/^oC	ASTM-C372	10.3	10.3
Specific heat, 100^oC	J/Kg*K	ASTM-E1269	400	400
Thermal Shock Resistance, (delta) Tc	^oC		350	350
Maximum Use Temperature	^oC	No-Load Cond.	1500	1500
Dielectric Strength	ac-kV/mm (acV/mil)	ASTM-D116	9.0 (228)	9.0 (228)
Dielectric Constant, 1MHz	25^oC	ASTM-D150	29	29
Dielectric Loss (tan delta) 1 MHz	25^oC	ASTM-D2520	0.001	0.001
Volume Resistivity 25^oC	ohm-cm	ASTM-D1829	>10¹³	>10¹³
500^oC	ohm-cm	ASTM-D1829	2 x 10⁴	2 x10⁴
1000^oC	ohm-cm	ASTM-D1829	>10³	<10³
Impingement			0.2	0.2
Rubbing			0.2	0.2

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