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Patent US3741748A successfully refreshed from Google Patents.
US3741748A
Expired / Lapsed
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Metal dispersoid powder compositions
Assignee: Viridian Inc Canada
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Filing: 1970-10-01
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Granted: 1973-06-26
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Expires: 1990-10-01
Abstract
Abstract A powder composition suitable for powder metallurgical preparation of high temperature resistant wrought metal and metal alloy products. The composition contains highly disseminated and uniformly spaced refractory dispersoid particles fixed to metallic host particles. The host particles are in the form of anisodimensional platelets of nickel, cobalt, iron or an alloy based on at least one of these metals. The platelets have a maximum thickness of about 1,000 millimicrons and a minimum width at least 5 times the thickness. The refractory dispersoid particles have a mean radius in the range of 2-20 millimicrons and are fixed in the planar surfaces of the platelets in a volume fraction of about 0.001 to 0.10.
Inventors
- 👤 R Fraser
- 👤 D Evans
- 👤 D Fustukian
- 👤 L Norris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:11
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/04; C22C1/05; C22C1/051; Y; Y10; Y10S; Y10S75/00; Y10S75/956
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
53 words
The powder composition according to claim 1 wherein the thickness, t, of the host particles relates to dispersoid particle variables f and r in accordance with the expression t < (0.5(1-f)r)/(f) wherein f is the volume fraction of dispersoid in the powder composition and r is the mean radius of the dispersoid particles.
Claim 2
Dependent Claim
27 words
The composition according to claim 2 wherein t is less than 600 millimicrons, r is between 2 and 10 millimicrons and f is between 0.015 and 0.040.
Claim 3
Dependent Claim
21 words
The composition according to claim 3 wherein the host particle is formed of nickel and the dispersoid is formed of thoria.
Claim 4
Dependent Claim
22 words
The composition according to claim 3 wherein the host particle is formed of nickel-chromium alloy and the dispersoid is formed of thoria.
Claim 5
Dependent Claim
130 words
A process for producing metal and metal alloy refractory dispersoid powder suitable for use in powder metallurgy fabrication of wrought dispersion strengthened metal and metal alloy products which comprises the steps of: providing a powder composition comprises of substantially equi-axed metallic particles formed of nickel, cobalt, iron or An alloy based on at least one of these metals, said metallic particles being in the size range of about 0.2 to about 5 microns and having fixed in the surfaces thereof from about 0.001 to about 0.10 volume fraction of refractory dispersoid particles having a mean particle radius of about 1 to about 20 millimicrons, milling said powder composition for a time sufficient to alter said substantially equi-axed particles to plate-like particles having a maximum plate thickness of about 1,000 millimicrons.
Claim 6
Dependent Claim
12 words
The process according to claim 6 wherein wet attrition milling is employed.
Claim 7
Dependent Claim
22 words
The process according to claim 7 wherein milling is continued until the plate-like particles have a thickness of less than 600 millimicrons.
Claim 8
Dependent Claim
68 words
The process according to claim 7 wherein the substantially equi-axed metallic particles are selected such that upon alteration of the shape of said metallic particles to platelets, the dispersoid volume fraction and mean particle size relate to the platelet thickness in accordance with the expression t < ((0.5(1-f)r)/(f) where t is the platelet thickness, f is the dispersoid volume fraction and r is the mean dispersoid particle radius.
References Cited (Backward Citations)
US3479180A
Cited
US3591362A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |