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 alumina 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 ceramic 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.
The Technical Parameters Of 99.5% Alumina Ceramic
| Performance | Unit | 995 Alumina AL2O3 |
| Bulk density | g/cm3 | 3.6~3.8 |
| Rockwell hardness | HRA≥ | 82~86 |
| Flexural strength | Mpa≥ | 300 |
| Maximum use temperature | °C | 1700 |
| Linear expansion coefficient | ×10-6/C | 7.15-7.67 |
| Dielectric constant | Er(20°C, 1MHz) | 9.21 |
| Dielectric strength | kV/mm | twenty three |
| Dielectric loss | tan6×10-4,1MHz | 2.5 |
| Volume resistivity | -cm(100°C) | 9.2*1016 |
| Compressive strength | Mpa≥ | 2550 |
| Flexural strength | Mpa≥ | 310 |
| Elastic Modulus | Gpa | 355 |
| Poisson’s ratio | l | 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 | , | powerful |
