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AssigneeVereinigte Aluminium Werke Aktiengeselschaft
InventorsWerner Schultze, Knut Weber, Jr.
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This invention relates to a ceramic or ceramic oxide hollow body and a method for its manufacture. The ceramic or ceramic oxide hollow body of the present invention does not require the use of a binder or adhering substrate or any type of internal embedded supports. The hollow body is capable of being manufactured for any desired diameter and length and is especially suited for thick walled pipes. The ceramic hollow body is homogeneous, free of internal cracks, and highly heat stable and shock insensitive. It is produced in a continuous quasi-isothermal thermal spray process in which hot atomized ceramic or ceramic oxide particles are sprayed as a plasma onto a non-adhering highly thermally conductive internally cooled mold core. The mold core is mounted on a rotating lathe which in turn is mounted on a longitudinally movable carriage to accomplish the uniform layer thickness of the hollow body. The mold core is removable from the hollow body and the hollow body thus removed is capable of being directly used without sintering.
A hollow body comprising layers of fused particles, said particles being selected from the group consisting of ceramic and ceramic oxide particles, said particles being free of any binding agent, said body being porous, free of internal adhering supports, and having been produced by exposing said layers to a temperature gradient which does not exceed 2.degree. C. per millimeter of layer thickness.
The hollow tubular body according to claidm 1 which comprises a ceramic material containing at least one member selected from the group consisting of the carbides, borides and nitrides of aluminum and titanium, said ceramic material being at least 99 weight percent pure.
Dependencies are inferred from the claim text.