B - Operations – Transporting – 05 – D
Patent
B - Operations, Transporting
05
D
117/128, 117/71
B05D 1/36 (2006.01) B05D 3/02 (2006.01) B05D 7/22 (2006.01) B32B 18/00 (2006.01) C04B 33/00 (2006.01) C04B 38/00 (2006.01) F16L 9/10 (2006.01)
Patent
CA 1066964
ABSTRACT OF THE DISCLOSURE: A method of forming a porous capillary layer of a metal oxide ceramic material onto a metal oxide ceramic substrate, which comprises covering the surface of the substrate with an aqueous slurry of a powdered mixture comprising the metal oxide of the ceramic substrate, silica and an alkali metal or alkaline- earth metal oxide, the powder mixture having a maximum particle size of about 44 microns, removing excess of slurry, depositing onto the wet surface a layer of granular ceramic material having a particle size of about 250 to about 500 microns, the granular ceramic material being applied in excess relative to the powder of the aqueous slurry to insure that a porous capillary structure will be obtained and causing the slurry to be drawn up between the particles so as to absorb substantially all the slurry, and firing the coated surface at a temperature to effect bonding of the ceramic layer, the powdered constituents of the mixture being proportioned to provide liquid phases at about 200-300°C above firing temperature. This method finds a particular application in the fabrication of ceramic heat pipes that are made entirely of good dielectric materials and have good heat transfer characteristics with respect to the materials employed.
262251
Dancy Edna A.
Vansant James H.
LandOfFree
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