C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 35/14 (2006.01) C04B 38/00 (2006.01)
Patent
CA 2135542
A shaped body of amorphous silicon dioxide, which has a chemical purity of at least 99.9 % and a cristobalite content of at most 1% and which is impermeable to gas, is known. To provide shaped bodies of amorphous silicon dioxide which have a high precision, which can be small or large in size and of simple to complicated shape, which have a chemical purity of at least 99.9 %, are impermeable to gas above wall thicknesses of 1 mm, which have a high cold flexural strength, low thermal conductivity and low radiation of heat, which are thermal shock resistant and can be exposed repeatedly or also long-term to temperatures in the range from 1000 to 1300°C and which can be welded in a sharply delineated manner without spreading joins and which have a low spectral transmission from the ultraviolet to the middle infrared spectral region, the shaped body is opaque, contains pores, at a wall thickness of 1 mm has a direct spectral transmission which is virtually constant in the wavelength range from .lambda. = 190 nm to .lambda. = 2650 nm and is below 10 %, and it has a density which is at least 2.15 g/cm3. A process for producing such shaped bodies is given.
Englisch Wolfgang
Moritz Stephan
Englisch Wolfgang
Heraeus Quarzglas Gmbh
Moritz Stephan
Shapiro Cohen
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