99.7% Alumina Ceramic Properties

99.7% Alumina Ceramic Properties
Item	Unité
Physical Properties
Color		Ivory
Densité	g/cm³	3.92
Alumina Content	%	99.5
Gas permeability		0
Water Absorption		0
Mechanical Properties
MONS’ Hardness	Grade	9
Rockwell Hardness	HRA	85
Vickers Hardness (Hv50)	Gpa(Kg/mm²)	17（1600）
Flexural Strength(20°C)	MPa	360
Compressive Strength(20°C)	MPa	2000
Modulus of Elasticity (20°C）	GPa	300
Poisson’s Ratio (20°C)		0.22-0.25
Fracture Toughness(20°C)	MPam1/2	4
Thermal Properties
Thermal Conductivity(20°C-400°C)	W（m.K）	29
Coefficient de dilatation thermique	10-6/°C	8
Résistance aux chocs thermiques	△T°C	230
Maximum Use Temperature	°C	1700
Electronic Properties
Rigidité diélectrique	kV/mm	＞10
Constante diélectrique	Er	9.5
Dielectric Loss Angle(1MHz)		0.0002-0.0003
Volume Resistivity(20°C）	Ω.cm	＞1014

Composition	Unité
Al2O3	%	99.74
Na2O	ppm	250
CaO	ppm	550
MgO	ppm	770
SiO2	ppm	865
Fe2O3	ppm	150