Wafer Products

HICERAM Wafer

Overview

About

NGK's HICERAM Wafer consists of 99.99% high purity alumina, enabling translucency, high insulation, and high strength. Large sizes (up to 12 inch) and variant shapes using NGK's original Mold-cast forming are available.

Surface SEM image of
dense poly-crystal structure

Properties

Comparison of Material Properties

SapphireHICERAMAluminaSiO2Si
Structure Single Crystal
Al2O3
Poly Crystal
Al2O3
Poly Crystal
Al2O3
Glass Single Crystal
Purity ≒100% >99.9% >90% ≒100% ≒100%
Total light transmittance 95-100% 95-100% - 100% -
CTE(Coefficient of Thermal Expansion)ppm/K 5 6 7.5 1 2.5
Thermal ConductivityW/mK 38 34 22-27 1 168
Volume ResistivityOhm-cm 1014 1014 1014 1016 103
Dielectric Constant 11 10 10 3.9 11.8
Grain Size - <30um ~1um - -
Wafer Sizeinch <6 (>8 Costly) <12 (easy to produce large size wafers) - -

Possible Applications

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