US4383970A
Expired / Lapsed
US
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Process for preparation of graphite-containing aluminum alloys
Assignee: Hitachi Ltd
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Filing: 1979-08-09
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Granted: 1983-05-17
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Expires: 1999-08-09
Abstract
Abstract PCT No. PCT/JP79/00211 Sec. 371 Date Apr. 11, 1980 Sec. 102(e) Date Apr. 11, 1980 PCT Filed Aug. 9, 1979 PCT Pub. No. WO80/00352 PCT Pub. Date Mar. 6, 1980.A process for preparation of graphite-containing aluminum alloys includes incorporating graphite particles into an aluminum containing melt. When the graphite particles are incorporated, floating of the graphite particles to the surface of the melt is prevented by the use of certain additive metals. Before the graphite particles are incorporated into the melt, titanium, chromium, zirconium, nickel, vanadium, cobalt, manganese, niobium or phosphorus is incorporated and dispersed into the melt. The produced aluminum alloys are suitable to use as dry frictional contacts such as bearings.
Inventors
- 👤 Katsuhiro Komuro
- 👤 Masateru Suwa
- 👤 Koh Soeno
- 👤 Masato Ohsawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:21
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/10; C22C1/1036; C22C1/02; C22C1/026; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12486
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
105 words
A process for preparation of graphitecontaining aluminum alloys by incorporating graphite into an aluminum or aluminum alloy melt, comprising the steps of incorporating at least one additive element selected from the group consisting of titanium, chromium, zirconium, nickel, vanadium, cobalt, mananese, and niobium in the range of 1.5˜20% by weight into aluminum or an aluminum alloy melt; then, incorporating graphite particles, without a metal coating, into the melt in an amount of 2˜30% by weight and dispersing the graphite particles into the melt; and thereafter, solidifying the aluminum or aluminum alloy melt containing the graphite particles; said graphite particles being dispersed within the solidified melt.
Claim 2
Dependent Claim
105 words
A process for preparation of graphitecontaining aluminum alloys by incorporating graphite into an aluminum or aluminum alloy melt, comprising the steps of incorporating at least one additive element selected from the group consisting of titanium, chromium, zirconium, nickel, vanadium, cobalt, mananese, and niobium in the range of 1.5˜20% by weight into aluminum or an aluminum alloy melt; then, incorporating graphite particles, without a metal coating, into the melt in an amount of 2˜30% by weight and dispersing the graphite particles into the melt; and thereafter, solidifying the aluminum or aluminum alloy melt containing the graphite particles; said graphite particles being dispersed within the solidified melt.
Claim 3
Dependent Claim
41 words
A process according to claim 1, wherein the graphite particles are incorporated in an amount of 20˜30% by weight and the additive element is incorporated in the melt to suppress floating of the graphite particles to the surface of the melt.
Claim 4
Dependent Claim
41 words
A process according to claim 1, wherein the graphite particles are incorporated in an amount of 15˜20% by weight and the additive element is incorporated in the melt to suppress floating of the graphite particles to the surface of the melt.
Claim 5
Dependent Claim
41 words
A process according to claim 1, wherein the graphite particles are incorporated in an amount of 2˜15% by weight and the additive element is incorporated in the melt to suppress floating of the graphite particles to the surface of the melt.
Claim 6
Dependent Claim
19 words
A process according to claim 4, wherein the graphite particles are incorporated in an amount of 3˜5% by weight.
Claim 7
Dependent Claim
26 words
A process according to claim 1, 2, 3 or 4, wherein the average particle size of the graphite particles is larger than 50 μm in diameter.
Claim 8
Dependent Claim
28 words
A process according to claim 1, 2, 3, or 4, wherein the aluminum alloy is an Al-Sn alloy, an Al-Cu alloy, an Al-Pb alloy or an Al-Si alloy.
Claim 9
Dependent Claim
33 words
A process according to claim 1, 2, 3 or 4, wherein the temperature of the melt is held between a temperature 50° C. higher than the liquidus of the melt and 900° C.
Claim 10
Dependent Claim
30 words
A process according to claim 1, 2, 3 or 4, wherein the aluminum or aluminum alloy melt containing graphite particles is solidified under the pressure of 400˜1000 kg/cm 2 .
Claim 11
Dependent Claim
22 words
A process according to claim 1, wherein the aluminum or aluminum alloy melt containing the graphite particles is solidified by water cooling.
Claim 12
Dependent Claim
87 words
A process for producing an aluminum alloy containing graphite by incorporating graphite particles into an aluminum or aluminum alloy melt, comprising the steps of incorporating at least one additive element selected from the group consisting of titanium, chromium, zirconium, nickel, vanadium, cobalt, manganese, niobium and phosphorus into an aluminum or aluminum alloy melt; then, incorporating and dispersing graphite particles, without metalcoating, into the melt; and thereafter, solidifying the aluminum or aluminum alloy melt containing the graphite under pressure; said graphite particles being dispersed within the solidified melt.
Claim 13
Dependent Claim
87 words
A process for producing an aluminum alloy containing graphite by incorporating graphite particles into an aluminum or aluminum alloy melt, comprising the steps of incorporating at least one additive element selected from the group consisting of titanium, chromium, zirconium, nickel, vanadium, cobalt, manganese, niobium and phosphorus into an aluminum or aluminum alloy melt; then, incorporating and dispersing graphite particles, without metalcoating, into the melt; and thereafter, solidifying the aluminum or aluminum alloy melt containing the graphite under pressure; said graphite particles being dispersed within the solidified melt.
Claim 14
Dependent Claim
80 words
A process for preparation of graphitecontaining aluminum alloys by incorporating graphite particles into an aluminum or aluminum alloy melt, comprising the steps of incorporating phosphorus into the aluminum or aluminum alloy melt in an amount of 0.1˜4% by weight; then, incorporating and dispersing graphite particles, without a metal coating, in an amount of 4˜30% by weight into the melt; and thereafter, solidifying the aluminum or aluminum alloy melt containing the graphite; said graphite particles being dispersed within the solidified melt.
Claim 15
Dependent Claim
80 words
A process for preparation of graphitecontaining aluminum alloys by incorporating graphite particles into an aluminum or aluminum alloy melt, comprising the steps of incorporating phosphorus into the aluminum or aluminum alloy melt in an amount of 0.1˜4% by weight; then, incorporating and dispersing graphite particles, without a metal coating, in an amount of 4˜30% by weight into the melt; and thereafter, solidifying the aluminum or aluminum alloy melt containing the graphite; said graphite particles being dispersed within the solidified melt.
Claim 16
Dependent Claim
20 words
A process according to claim 10 or 11, wherein the average size of graphite particles is larger than 50 μm.
Claim 17
Dependent Claim
26 words
A process according to claim 10 or 11, wherein the aluminum alloy is an Al-Sn alloy, an Al-Cu alloy, an Al-Pb alloy or an Al-Si alloy.
Claim 18
Dependent Claim
31 words
A process according to claim 10 or 11, wherein the temperature of the melt is held between a temperature 50° C. higher than the liquidus of the melt and 900° C.
Claim 19
Dependent Claim
29 words
A process according to claim 10 or 11, wherein the aluminum or aluminum alloy melt containing the graphite particles is solidified under the pressure of 400˜1000 kg/cm 2 .
Claim 20
Dependent Claim
22 words
A process according to claim 11, wherein the aluminum or aluminum alloy melt containing the graphite particles is solidified by water cooling.
Claim 21
Dependent Claim
110 words
A process for producing aluminum alloys having graphite particles dispersed therein, which comprises forming a melt of aluminum or an aluminum alloy; said melt containing 1 to 20% by weight of at least one additive element selected from the group consisting of titanium, chromium, zirconium, nickel, vanadium, cobalt, manganese and niobium or 0.1 to 4% by weight of phosphorus; dispersing 2 to 30% by weight of graphite particles, without a metal coating into said melt by throwing the graphite particles into the melt and by agitating the melt to form swirls therein; and thereafter solidifying the melt containing the graphite particles; said graphite particles being dispersed in the solidified melt.
Claim 22
Dependent Claim
110 words
A process for producing aluminum alloys having graphite particles dispersed therein, which comprises forming a melt of aluminum or an aluminum alloy; said melt containing 1 to 20% by weight of at least one additive element selected from the group consisting of titanium, chromium, zirconium, nickel, vanadium, cobalt, manganese and niobium or 0.1 to 4% by weight of phosphorus; dispersing 2 to 30% by weight of graphite particles, without a metal coating into said melt by throwing the graphite particles into the melt and by agitating the melt to form swirls therein; and thereafter solidifying the melt containing the graphite particles; said graphite particles being dispersed in the solidified melt.
Claim 23
Dependent Claim
24 words
A process according to claim 18, wherein said melt is formed by melting an admixture containing aluminum and said at least one additive element.
Claim 24
Dependent Claim
28 words
A process according to claim 18, wherein said aluminum alloy contains 1 to 20% by weight of said at least one additive element and a balance of aluminum.
Claim 25
Dependent Claim
41 words
A process according to claim 18, wherein the temperature of the melt into which the graphite particles are thrown is in a range of from a temperature higher by 50° C. than the liquidus of the melt to about 900° C.
Claim 26
Dependent Claim
21 words
A process according to claim 21, wherein the melt is agitated at an agitation rate in the range of 50˜500 rpm.
References Cited (Backward Citations)
US3600163A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-16 | 1986-11-15 | 1987-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-16 | 1990-11-15 | 1991-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-16 | 1994-11-15 | 1995-05-17 | $7700.00 | Window Closed / Lapsed |