Consolidation by chemical sintering

• US 3,359,098 A
• Filed: 02/17/1965
• Issued: 12/19/1967
• Est. Priority Date: 02/17/1965
• Status: Expired due to Term

• Current Assignee: Earl Q. Teaford
• Original Assignee: Earl Q. Teaford
• Inventors: Teaford, Earl Q.
• Application Number:
  US04/433,475
• Time in Patent Office: 1,035 Days
• US Class Current: 419/27
• CPC Class Codes: B22F 2998/10 Processes characterised by the sequence of their steps
• CPC Class Codes: B22F 3/10 Sintering only
• CPC Class Codes: B22F 3/1039 by reaction B22F3/001, B22F3/23 take precedence
• CPC Class Codes: B22F 3/114 the porous products being formed by impregnation B22F3/1137, B22F3/26 take precedence
• CPC Class Codes: B22F 3/1143 involving an oxidation, reduction or reaction step
• CPC Class Codes: B22F 3/26 Impregnating making ferrous alloys by impregnation C22C33/0242
• CPC Class Codes: C22C 1/02 by melting C22C1/1036 takes precedence
• CPC Class Codes: C22C 32/00 Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
• CPC Class Codes: C23C 16/045 Coating cavities or hollow spaces, e.g. interior of tubes; Infiltration of porous substrates

Claims

1. THE PROCESS OF PROCUDING A CHEMICALLY SINTERED, RIGID BODY, WHICH PROCESS COMPRISES:

MAINTAINNG A PREDETERMINED SHAPE OF LOOSELY PACKED, REFRACTORY METAL PARTICLES AT GRADIENT TEMPERATURES OF ABOUT 300* TO 700*C., WITH A TEMPERATURE DIFFERENTIAL OF AT LEAST 50*C. BETWEEN THE LOWEST AND THE HIGHEST TEMPERATURE PORTION AND WITH PROGRESSIVELY HIGHER TEMPERATURES MAINTAINED IN SAID SHAPE IN THE DIRECTION OF HYDROGEN GAAS AND TUNGSTEN HEXAFLUORIDE VAPOR CONCURRENTLY FLOWING THROUGH INTERSTICES OF SAID PREDETERMINED SHAPE.