Patent US3830435A successfully refreshed from Google Patents.
US3830435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of ceramic-metal composite powders and articles thereof
Assignee: Huntington Alloys Corp
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Filing: 1972-06-12
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Granted: 1974-08-20
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Expires: 1992-06-12
Abstract
Abstract Ceramic-metal powder products are produced by subjecting a charge of ceramic powder particles and a small volume of metal powder to dry high transmissive energy milling, the weight ratio of impacting media to powder being greater than 1:1 with the milling being conducted for a period beyond the threshold point of the powder constituents, whereby dense, composite ceramicmetal powder particles are obtained having an interdispersion of initial constituent particles, a large internal interfacial surface within individual product powder particles, etc.
Inventors
- 👤 B Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:30
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/10; H01F1/11; C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/71; H01F1/09
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
22 words
A process in accordance with claim 1 in which the weight ratio of impacting media to ceramic-metal powder is at least 3:1.
Claim 2
Dependent Claim
22 words
A process in accordance with claim 2 in which the weight ratio of impacting media to ceramic-metal powder is at least 10:
Claim 3
Dependent Claim
24 words
A process in accordance with claim 2 in which at least 60 percent of the impacting media is maintained in a highly active state.
Claim 4
Dependent Claim
27 words
A process in accordance with claim 2 in which the ceramic metal powder charge contains at least one member from the group consisting of alumina and nickel.
Claim 5
Dependent Claim
21 words
A process in accordance with claim 5 in which the composite product powder particles are used to form a cutting tool.
Claim 6
Dependent Claim
40 words
A process for producing a cutting tool in which the ceramic metal product powder particles of claim 5 are hot pressed in a die to provide a cutting tool blank and the blank is ground to the desired tool dimensions.
Claim 7
Dependent Claim
207 words
A process for producing dense, ceramic composite product powder particles containing a small volume fraction of at least one metal constituent, the ceramic-metal product particles having a large internal interfacial surface within individual product powder particles, a surface area less than that of the original constituent powders, excellent homogeneity with the metal being intimately intradispersed throughout the ceramic matrix of each product particLe and with the individual constituents being distributed substantially uniformly at close interparticle spacings within the product powder particles, which comprises forming a charge of ceramic-metal powder and milling impacting media, the ceramic-metal charge being formulated to provide ceramic-metal product powder particles which upon heating react to form a member from the group consisting of spinels, hexagonal ferrites, titanates and garnets, and in which the volume of metal is from about 2.5 to 12.5 percent and with the weight ratio of impacting media to powder being greater than 1:1 subjecting the charge under dry conditions to high transmissive energy milling such that the individual constituent powder particles are continuously brought into contact with the compressive energies of the impactng media, and continuing such period beyond the threshold point of the powder constituents, whereby dense, homogeneous, mechanically cold-bonded composite, ceramic metal product powder particles are produced.
Claim 8
Dependent Claim
19 words
A process in which the product powder particles of claim 8 are heat treated to form nickel ferrite particles.
Claim 9
Dependent Claim
19 words
A process in which the product powder particles of claim 8 are heat treated to form barium ferrite particles.
Claim 10
Dependent Claim
19 words
A process in which the product powder particles of claim 8 are heat treated to form barium titanate particles.
Claim 11
Dependent Claim
20 words
A process in which the product powder particles of claim 8 are heat treated to form yttrium iron garnet particles.
Claim 12
Dependent Claim
24 words
A process in accordance with claim 8 in which the ceramic metal powder particles are heated to form a ferrite, titanite or garnet product.
References Cited (Backward Citations)
US3591362A
Cited
US3670970A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |