Oxide Ceramics｜99.5% Alumina Ceramic

99.5% alumina powder is white powder or fine sand, with good fluidity and stable performance. It is difficult to dissolve in acid-base solution and has good sintering performance. After the material is isostatically pressed and dry pressed into various shapes and sintered, its color is still white. It is usually used as a raw material in high-alumina refractory materials, electromagnetic devices, and polishing and grinding products.

The density of 99.5% alumina ceramics is greater than that of 95% and 99% alumina ceramics. It has strong impact resistance and can greatly improve the grinding efficiency. The main molding methods of 99.5% alumina ceramic products are dry pressing, isostatic pressing, and injection molding. Products with different shapes, sizes, complex shapes and precision require different molding methods. High temperature sintered 99.5% alumina ceramic products can only be machined using a diamond grinding process. The 99.5% alumina ceramic material has extremely high hardness and wear resistance, strong corrosion resistance, high temperature corrosion resistance and biological inertness.

Material Properties of 99.5% Alumina Ceramic Al2O3

Parameter	Unit	Value
Bulk Density	g/cm3	3.6 ~ 3.8
Rockwell Hardness	HRA≥	82 ~86
Bending Strength	Mpa≥	300
Maximum Operating Temperature	℃	1700
Linear Expansion Coefficient	×10-6/℃	7.15-7.67
Dielectric Constant	εr(20℃,1MHz)	9.21
Dielectric Strength	KV/mm	23
Dielectric Loss	tanδ×10-4,1MHz	2.5
Volume Resistivity	Ω·cm(100℃)	9.2*1016
Compressive Strength	Mpa≥	2550
Rupture Strength	Mpa≥	310
Elastic Modulus	Gpa	355
Poisson's Ratio	/	0.2
Thermal Conductivity	W/m·K(20℃)	31~36
DC Breakdown Strength	KV/mm	43.7
Tensile Seal Strength	Mpa	104.4
Acid and alkali corrosion resistance	/	Strong