Patent US3754905A successfully refreshed from Google Patents.
US3754905A
Expired / Lapsed
US
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Exothermic structuring of aluminum
Assignee: Johnson & Co Inc A
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Filing: 1971-12-23
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Granted: 1973-08-28
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Expires: 1991-12-23
Abstract
Abstract Strongly bonded aluminous bodies with produced by powder metallurgy by blending an amount of nickel powder with aluminum powder at least sufficient to effect the exothermic sintering of a pressed compact of the blended powder by heating the compact in a furnace maintained at a temperature below the eutectic temperature of the aluminum-nickel system and higher than the temperature at which nickel reacts exothermically wth aluminum.
Inventors
- 👤 W Knopp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:34
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/08
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
17 words
The method of claim 1, wherein the amount of nickel ranges from about 1 to 20 percent.
Claim 2
Dependent Claim
17 words
The method of claim 2, wherein the amount of nickel ranges from about 2 to 10 percent.
Claim 3
Dependent Claim
37 words
The method of claim 1, wherein the compact is heated to an exothermic initiating temperature of at least about 900*F and wherein the temperature of the furnace is maintained within the range of about 1100*F to 1175*F.
Claim 4
Dependent Claim
22 words
The method of claim 4, wherein the temperature of the furnace is maintained within the temperature range of about 1125*F to 1170*F.
Claim 5
Dependent Claim
17 words
The method of claim 2, wherein the aluminum powder has a particle size less than 40 mesh.
Claim 6
Dependent Claim
19 words
The method of claim 6, wherein the average size of the nickel powder ranges up to about 20 microns.
Claim 7
Independent Claim
207 words
A method of producing by powder metallurgy a sintered strongly bonded porous aluminous body which comprises, blending with aluminum powder an amount of nickel powder ranging up to about 30 percent by weight based on the sum of the nickel and aluminum content effective to react exothermically with aluminum when heated to an exothermic initiating temperature, forming a compacted body of said blend having a cellular-like structure in the form of porosity ranging by volume from about 10 percent to 60 percent, placing said body in a furnace maintained at an average temperature below the aluminum-nickel eutectic temperature, and allowing said compacted porous body to heat up in said furnace to at least the exothermic initiating temperature, whereby as the blend reaches said exothermic initiating temperature and reacts, localized heating at above the eutectic temperature is effected at contact points between the aluminum and nickel particLes effective to cause bonding thereof, while the temperature of the furnace is maintained at below the eutectic temperature, such that any excess heat developed locally within the compact by the exothermic reaction is absorbed by the compact and the furnace while maintaining the average temperature of the compact at below the eutectic temperature during the major portion of the sintering cycle.
Claim 8
Dependent Claim
17 words
The method of claim 8, wherein the amount of nickel ranges from about 1 to 20 percent.
Claim 9
Dependent Claim
17 words
The method of claim 9, wherein the amount of nickel ranges from about 2 to 10 percent.
Claim 10
Dependent Claim
37 words
The method of claim 8, wherein the compact is heated to an exothermic initiating temperature of at least about 900*F and wherein the temperature of the furnace is maintained within the range of about 1,100*F to 1,175*F.
Claim 11
Dependent Claim
23 words
The method of claim 11, wherein the temperature of the furnace is maintained within the temperature range of about 1, 125*F to 1,170*F.
Claim 12
Dependent Claim
17 words
The method of claim 9, wherein the aluminum powder has a particle size less than 40 mesh.
Claim 13
Dependent Claim
19 words
The method of claim 13, wherein the average size of the nickel powder ranges up to about 20 microns.
Claim 14
Independent Claim
214 words
A method of producing by powder metallurgy a sintered strongly bonded composite aluminous body which comprises: blending with aluminum powder an amount of an insoluble refractory material ranging from about 5 percent to 60 percent by weight, nickel ranging up to about 50 percent by weight based on the sum of the nickel and aluminum content effective to react exothermically with aluminum when heated to an exothermic initiating temperature, the aluminum making up substantially the balance of at least about 30 percent by weight, forming a compacted body of said blend, placing said body in a furnace maintained at an average temperature below the aluminum-nickel eutectic temperature, and allowing said compacted body to heat up in said furnace to at least the exothermic initiating temperature, whereby as the blend reaches said exothermic initiating temperature and reacts, localized heating at above the eutectic temperature is effected at contact points between the aluminum and nickel effective to cause bonding thereof, while the temperature of the furnace is maintained at below the eutectic temperature, such that any excess heat developed locally within the compact by the exothermic reaction is absorbed by the compact and the furnace while maintaining the average temperature of the compact at below the eutectic temperature during the major portion of the sintering cycle.
Claim 15
Dependent Claim
30 words
The method of claim 15, wherein the refractory material is selected from the group consisting of carbon, carbides and borides of refractory metals, silicon carbide, boron carbide and refractory oxides.
Claim 16
Dependent Claim
11 words
The method of claim 16, wherein the refractory material is carbon.
Claim 17
Dependent Claim
46 words
The method of claim 16, wherein the refractory material ranges in weight from about 20 to 60 percent, wherein the nickel ranges in weight from about 1 to 20 percent and wherein the aluminum as essentially the balance is at least about 30 percent by weight.
Claim 18
Dependent Claim
17 words
The method of claim 16, wherein the refractory material employed in producing the composite is nickel coated.
Claim 19
Dependent Claim
17 words
The method of claim 18, wherein the amount of nickel ranges from about 2 to 10 percent.
Claim 20
Dependent Claim
37 words
The method of claim 15, wherein the compact is heated to an exothermic initiating temperature of at least about 900*F and wherein the temperature of the furnace is maintained within the range of about 1,100*F to 1,175*F.
Claim 21
Dependent Claim
23 words
The method of claim 21, wherein the temperature of the furnace is maintained within the temperature range of about 1, 125*F to 1,170*F.
Claim 22
Dependent Claim
31 words
The method of claim 18, wherein the aluminum has a particle size of less than 100 mesh and wherein the refractoRy material has a particle size of less than 100 mesh.
Claim 23
Dependent Claim
30 words
The method of claim 19, wherein the nickel-coated refractory contains an amount of nickel as the coating ranging from about 5 to 60 percent by weight of the nickel-coated refractory.
Claim 24
Dependent Claim
25 words
The method of claim 24, wherein the nickel making up the coating ranges from about 10 to 50 percent by weight of the coated material.
Claim 25
Dependent Claim
102 words
A sintered aluminous body formed from a blend of aluminum powder and up to about 30 percent by weight of nickel powder based on the sum of the aluminum and nickel content, said sintered aluminous body being characterized metallographically by a matrix comprising a cellular-like structure in which the cells occupy about 10 percent to 60 percent by volume of the body, the amount of nickel being at least sufficient such that the sintered bonds providing said cellular-like structure are characterized by the presence of an aluminum-nickel compound formed as a result of an exothermic reaction between aluminum and nickel during sintering.
Claim 26
Dependent Claim
17 words
The sintered aluminous body of claim 26, wherein the cellular-like structure comprises pores dispersed through said matrix.
Claim 27
Dependent Claim
36 words
The sintered aluminous body of claim 27, wherein said pores are occupied by a refractory material selected from the group consisting of carbon, carbides and borides of refractory metals, silicon carbide, boron carbide and refractory oxides.
Claim 28
Dependent Claim
106 words
A sintered aluminous body formed from a blend of aluminum powder and up to about 30 percent by weight of nickel powder based on the sum of the aluminum and nickel content, said sintered aluminous body being characterized metallographically by a matrix comprising a cellular-like structure in which the cells occupy about 10 percent to 60 percent by volume of the body, said cells containing carbon, the amount of nickel being at least sufficient such that the sintered bonds providing said cellular-like structure are characterized by the presence of an aluminum-nickel compound formed as a result of an exothermic reaction between aluminum and nickel during sintering.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |