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US4657794A Expired / Lapsed US ⏱️ 0.0 years remaining

Binderless ceramic or ceramic oxide hollow body and method for its manufacture

Assignee: Osaka Fuji Corp
•
Filing: 1985-08-23
•
Granted: 1987-04-14
•
Expires: 2005-08-23
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Abstract

Abstract 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.

Inventors

  • 👤 Werner Schultze
  • 👤 Knut Weber, Jr.

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-09 03:29
CPC Classifications
B; B28; B28B; B28B1/00; B28B1/30; B28B1/32; B28B21/00; B28B21/42; B28B21/44; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1314

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 62 words
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° C. per millimeter of layer thickness.
Claim 2
Dependent Claim 62 words
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° C. per millimeter of layer thickness.
Claim 3
Dependent Claim 20 words
A hollow body according to claim 1 wherein said body has an exterior wall thickness greater than about 5 mm.
Claim 4
Dependent Claim 22 words
A hollow body as defined in claim 1, said body being impermeable, highly heat stable, shock resistant and free of internal cracks.
Claim 5
Dependent Claim 43 words
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.
Claim 6
Dependent Claim 43 words
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.
Claim 7
Dependent Claim 41 words
The hollow tubular body according to claim 1 which comprises at least one ceramic material selected from the group consisting of aluminum oxide, magnesium oxide, titanium oxide and mixtures thereof, said ceramic oxide material being at least 99.5 weight percent pure.

References Cited (Backward Citations)

US4117868A Cited
US4005235A Cited
US4082863A Cited
US4330496A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1990-04-13 1990-10-13 1991-04-14 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1994-04-13 1994-10-13 1995-04-14 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1998-04-13 1998-10-13 1999-04-14 $7700.00 Window Closed / Lapsed

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