§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
US3775100A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for making sintered articles

Assignee: Battelle Development Corp
•
Filing: 1970-07-29
•
Granted: 1973-11-27
•
Expires: 1990-07-29
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract A process for making sintered articles from powdered particles of high-temperature nickel-base or cobalt-base alloys which contain from 3.0 to 30.0 weight percent of refractory elements having a melting point at least 450*C. above that of the base metal, the particles being characterized by a concentration at their surface of refractory elements or intermetallic compounds which constitutes a barrier to the diffusion of alloying elements, which process comprises coating said particles with a thin layer of a diffusion-promoting metal which is a constituent of the alloy to be sintered and is selected from the group consisting of cobalt, nickel, titanium, zirconium, iron, and vanadium, the quantity of said diffusion-promoting metal being insufficient to materially change the composition and properties of the alloy to be sintered, compacting the particles into an article of the desired shape, and sintering the compacted article in a non-reactive environment at normal sintering temperatures.

Inventors

  • 👤 D Kizer

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 22:19
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/04; C22C1/0433; B; B22; B22F; B22F1/00; B22F1/17

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 18 words
The process of claim 1 including the step of further heating the sintered article to homogenize the structure.
Claim 2
Dependent Claim 28 words
The process of claim 1 wherein said refractory alloying element is selected from the group consisting of tungsten, molybdenum, niobium, tantalum, hafnium, ruthenium, and rhodium, and combinations thereof.
Claim 3
Dependent Claim 22 words
The process of claim 1 wherein said particles are coated with from about 0.25 to 5.0 weight percent of said diffusion-promoting metal.
Claim 4
Dependent Claim 32 words
The process of claim 1 wherein said particles are produced by atomization of a molten metal stream and wherein said particles are coated with said diffusion-promoting metal during cooling of the particles.
Claim 5
Dependent Claim 14 words
The process of claim 5 wherein said particles are coated by chemical vapor deposition.
Claim 6
Dependent Claim 20 words
The process of claim 1 wherein said particles are coated by thermal decomposition of a compound in a fluidized bed.
Claim 7
Dependent Claim 19 words
The process of claim 1 wherein said particles are no longer than about United States Standard mesh No. 100.
Claim 8
Dependent Claim 74 words
The process of claim 1 wherein said complex alloy is consists essentially of 0.1 percent carbon, 8 percent chromium, 10 percent cobalt, 6 percent molybdenum, 1 percent titanium, 6 percent aluminum, 0.015 percent boron, up to 0.35 percent iron, 0.08 percent zirconium, up to 0.20 percent manganese, up to 0.015 percent sulfur, up to 0.25 percent silicon, up to 0.10 percent tungsten, up to 0.10 percent niobium, 4.25 percent tantalum, and the balance nickel.
Claim 9
Dependent Claim 11 words
The process of claim 9 wherein said diffusion-promoting metal is nickel.

References Cited (Backward Citations)

US3223523A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-11-26 1977-05-28 1977-11-27 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-11-26 1981-05-28 1981-11-27 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-11-26 1985-05-28 1985-11-27 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag