Powdered silica, silica container, and method for producing them
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United States of America Patent
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Jun 11, 2013
Grant Date -
Oct 20, 2011
app pub date -
Sep 1, 2010
filing date -
Oct 14, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A method is provided for producing a silica container arranged with a substrate, having a rotational symmetry, comprised of mainly a silica, and containing gaseous bubbles at least in its peripheral part, and an inner layer, formed on an inner surface of the substrate and comprised of a transparent silica glass; wherein a powdered silica, having particle diameter of 10 to 1000 μm, containing Ca, Sr, and Ba with the total concentration of 50 to 5000 ppm by weight, and releasing hydrogen molecules with the amount of 3×1016 to 3×1019 molecules/g upon heating at 1000° C. under vacuum, is prepared at least as a powdered raw material for forming the inner layer, and then the inner layer is formed from the powdered silica as the powdered raw material for forming the inner layer.
First Claim
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International Classification(s)
- F16L:PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR ....
- C03C:CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREO....
- B28B:SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS, SLAG O....
- B29D:PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FRO....
- A47G:HOUSEHOLD OR TABLE EQUIPMENT
- B32B:LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA....
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