HBQ100 - A Novel Silicon-Silica Composite

摘要

We are introducing a novel, black silica-composite material. The black appearance of HBQ is achieved by embedding elemental Silicon particles in a densely sintered, pure silica matrix (>99.9%). Material properties, such as low thermal conductivity, thermal shock resistance, low-coefficient of thermal expansion and chemical inertness, are governed by the silica matrix. The temperature dependent high emissivity of HBQ results from the indirect band-gap of the incorporated elemental Silicon. The absence of carbon in the material yields a high resistance against oxidizing and reducing atmosphere at temperatures up to as high as 1300°C. Combined with the availability in a wide dimensional range and the ease of machining, HBQ is suitable for a wide field of applications and is already in use where emissivity, purity and thermal stability are essential.