Calcinated or sintered hollow body comprising a spherically curved surface
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United States of America Patent
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May 28, 2013
Grant Date -
Dec 4, 2008
app pub date -
Aug 17, 2006
filing date -
Aug 19, 2005
priority date (Note) -
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Abstract
A method is for producing calcinated or sintered hollow bodies comprising a spherical surface, to hollow bodies produced using the method, and to the uses thereof. Calcinated or sintered hollow bodies comprising a spherically curved surface, an enlarged, freely accessible surface and/or a structured surface. An organic spherical carrier is coated with a powder which forms the shell of a hollow body, and a binding agent, both contained in suspension. A heat treatment is then carried out, leading to the expulsion of organic constituents and to the sin-tering process. At least one elevation is arranged on the surface of the carrier or embodied thereon, the projection past the surface corresponding at least to the thickness of the shell of the finished sintered hollow body, taking into account the degree of shrinkage of the powder material during the sintering process. The elevation(s) is/are then removed by conversion into the gas phase of the respective material from which they are formed and/or mechanically, during the heat treatment.
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