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Nishimura produce visible light reflection ceramics, and it is named N-9000T. The material is ultrafine particle alumina. Reflect the electromagnetic wave of the visible light region. Reflectivity is 90 – 94%. Also,this material can prevent color-changing from UV light.
Feature
-Hard (Vickers hardness of 18.8GPa)
-White color
-Unfading
-Reflectivity more than 90% in thickness 2.5mm (Wavelength range 200～1000nm)
Applications
-Base plate for LED
-Measurement plate for LED
-RF window
-Sputtering target
Properties table
| Material Name | Alumina | ||
| Nishimura No. | N-9000T | ||
| Main Component（AL2O3） | >99.9％ | ||
| Color | White | ||
| Bulk specific gravity | 3.95 | ||
| Water absorption | 0 | ||
| Mechanical Properties | Vickers hardness | GPa | 18.8 |
| Bending strength | MPa | 405 | |
| Compressive strength | MPa | 3655 | |
| Tension strength | MPa | 213 | |
| Impact bending strength | MPa | 0.7 | |
| Electrical properties | Volume resistivity | Ω・cm | 2.0×1016（20～100℃） |
| Dielectric constant 1MHz | 10 | ||
| Dielectric loss tangent 1MHz | 1×10-4 | ||
| Dielectric strength | Kv/mm | ＞10 | |
| Te value | ℃ | 1000 | |
| Thermal properties | Thermal expansion coefficient | 10-6/K | 8.18 |
| Thermal conductivity | W/m・K | 38 | |
| Max. Operation temperature | ℃ | 1200 | |
| Thermal shock resistance | ℃ | 200 | |
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