Typical Properties

Items Unit		Test condition	Machinable Ceramics			Engineering Ceramics
Materials			MACOR^®	SHAPAL^® Hi Msoft	Boron- nitride	Alumina 99.5%	Zirconia	Aluminum- nitride	Silicon- carbide
General Property	Specific Gravity g/cm³		2.5	2.88	2	3.9	6	3.3	3
	Porosity %		0	-	11	0	0	0.2	0
	Water Absorption %		0	-	-	0	0	0	0
Electrical Property	Volume Resistivity Ω・cm	RT	>10¹⁶	10¹⁴	>10¹⁵	10¹⁴	10¹⁰	10¹⁴	10^-2～10¹
	Dielectric Breakdown Voltage kV/mm	RT	40	50～60	53	10	-	15	-
	Dielectric Loss Tangent(×10^-3)	1MHz	7.1(8.5GHz)	1	0.2	0.2～0.3	-	0.14	-
	Dielectric Constant	1MHz	5.67(8.5GHz)	6.8	4.1	9.8	-	9.1	-
Thermal Property	Coefficient of Thermal Expansion (×10^-7) /℃	RT～300℃	93	-	-	77	90	43	43(900℃)
	Coefficient of Thermal Expansion (×10^-7) /℃	RT～700℃	120	-	30～40	-	-	-	-
	Coefficient of Thermal Conductivity W/m・K	RT	1.4	92	33～55	29	1.7	177	220
	Specific Heat kJ/kg・K	RT	0.8	-	0.8	0.8	0.5	0.7	0.7
	Maximum Allowable Working Temperature ℃	Oxidizing Atmosphere	1000	-	850	1600	-	1000	1350
	Maximum Allowable Working Temperature ℃	Inert Atmosphere	800	-	1600	-	-	1800	-
	Thermal shock resistance(△T) ℃	Water Quench Test	200	400	1500	200	-	250	-
Mechanical Property	Vickers Hardness GPa	RT	2.2	3.8	-	15.7	12.8	11	-
	Flexural Strength MPa	RT	>94	320	41～51	441	1177	381	290
	Flexural Strength MPa	1000℃	-	-	-	-	-	-	270(1200℃)
	Compressive Strength MPa	RT	345	-	62～69	2452	>2452	3580	-
	Young's Modulus GPa	RT	66.9	-	48～62	363	206	320	370
Main Ingredien			SiO₂ 46% MgO 17% Al₂O₃ 16%	Complex of AlN and BN	h-BN>94%			AlN≧94%	Sintered Reaction-bonded High Purity Silicon-carbide (SiC,Si)