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US3779715A Expired / Lapsed US ⏱️ 0.0 years remaining

Heat resistant high strength composite structure of hard metal particles in a matrix, and method of making the same

Assignee: Permanence Corp
•
Filing: 1972-06-23
•
Granted: 1973-12-18
•
Expires: 1992-06-23
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Abstract

Abstract A high strength structure made of hard metal particles, such as metal carbide particles, brazed to each other in a porous lattice of a first brazing metal or alloy, the voids and spaces in the brazing metal or alloy being filled by a solidified second brazing metal or alloy of a melting point lower than the melting point of the first brazing metal or alloy. The second brazing metal or alloy may also contain a dispersion of hard metal particles, such as metal carbide particles, generally of a smaller size than that of the original hard metal particles. The structure is made by mixing a predetermined proportion of hard metal particles with the first brazing metal or alloy in the form of a powder, and by sintering in a furnace so as to obtain a substantially porous structure, followed by a second pass in the furnace of the porous structure covered with the second brazing metal or alloy in a powder form so as to impregnate the porous structure with the melted second brazing metal or alloy.

Inventors

  • 👤 C Wendler
  • 👤 C Baum

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-27 06:39
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/04; C22C1/05; C22C1/051; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/1216; Y10T428/12167

Claims Analysis

Total Claims: 12
Claim 1
Independent Claim 15 words
The structure of claim 1 wherein said first particle size range is 6/20 mesh size.
Claim 2
Dependent Claim 15 words
The structure of claim 1 wherein said second particle size range is 10/20 mesh size.
Claim 3
Dependent Claim 15 words
The structure of claim 3 wherein said second particle size range is 10/50 mesh size.
Claim 4
Dependent Claim 14 words
The structure of claim 1 wherein said hard metal particles are metal carbide particles.
Claim 5
Dependent Claim 20 words
The structure of claim 1 wherein said structure is approximately 3/16 to 1/4 inch in (5 to 6.5 mm) thickness.
Claim 6
Dependent Claim 176 words
A heat resistant high strength structure comprising essentially at least a pair of originally porous bodies formed of a plurality of hard metal particles of a first particle size range brazed to each other by a lattice of a softer first brazing material, the weight ratio of said hard metal particles to said first brazing material being about 2 parts to 1 to 5 parts to 1, and a second brazing material of a melting point lower than that of said first brazing material impregnating said lattice and filling the spaces in said lattice of first brazing material so as to form a matrix, said second brazing material including hard metal particles of a second particle size range smaller than said first particle size range dispersed therein and the ratio of the weight of said hard metal particles to the weight of said matrix being comprised between about 0.75 to 1 and about 1 to 1, said bodies being disposed on top of each other and being brazed to each other by means of said matrix.
Claim 7
Dependent Claim 15 words
The structure of claim 7 wherein said first particle size range is 6/20 mesh size.
Claim 8
Dependent Claim 15 words
The structure of claim 7 wherein said second particle size range is 10/20 mesh size.
Claim 9
Dependent Claim 15 words
The structure of claim 7 wherein said second particle size range is 10/50 mesh size.
Claim 10
Dependent Claim 14 words
The structure of claim 7 wherein said hard metal particles are metal carbide particles.
Claim 11
Dependent Claim 14 words
The structure of claim 7 wherein said hard metal particles are metal carbide particles.
Claim 12
Dependent Claim 22 words
The structure of claim 7 wherein each of said bodies is approximately 3/16 to 1/4 in. (5 to 6.5 mm) in thickness.

References Cited (Backward Citations)

US2042635A Cited
US2401483A Cited
US3407061A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-12-17 1977-06-18 1977-12-18 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-12-17 1981-06-18 1981-12-18 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-12-17 1985-06-18 1985-12-18 $7700.00 Window Closed / Lapsed

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