Patent US4744947A successfully refreshed from Google Patents.
US4744947A
Expired / Lapsed
US
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Method of dispersion-hardening of copper, silver or gold and of their alloys
Assignee: Battelle-Institut
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Filing: 1986-04-18
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Granted: 1988-05-17
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Expires: 2006-04-18
Abstract
Abstract According to a method of dispersion hardening copper, silver or gold, melts on the basis of the matrix metals with stoichiometric additions of boron and boride-forming metals are superheated by 300° to 750° C. and subsequently subjected to extremely rapid solidification at a rate of at least 10 3 to 10 4 °C. per second. The boride-forming metals used are preferably titanium and/or zirconium. An excess of preferably about 5 to 20% of boride-forming metal over the stoichiometric amount yields particularly favorable products.
Inventors
- 👤 Fehmi Nilmen
- 👤 Heinrich Winter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:24
CPC Classifications
C; C22; C22C; C22C32/00; C22C32/0047; C22C32/0073
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
92 words
Method for the dispersion hardening of copper, silver or gold as well as the alloys thereof as the matrix metal with at least one metal boride as the dispersoid, comprising: preparing a single melt of the matrix metal, adding stoichiometric amounts of boron and at least one boride forming metal to said melt, superheating the resultant melt by about 300°to 750° C. above the melting temperature of the matrix metal and subsequently subjecting said melt to extremely rapid solidification at a rate of at least 103° C. to 104° C. per second.
Claim 2
Dependent Claim
92 words
Method for the dispersion hardening of copper, silver or gold as well as the alloys thereof as the matrix metal with at least one metal boride as the dispersoid, comprising: preparing a single melt of the matrix metal, adding stoichiometric amounts of boron and at least one boride forming metal to said melt, superheating the resultant melt by about 300°to 750° C. above the melting temperature of the matrix metal and subsequently subjecting said melt to extremely rapid solidification at a rate of at least 103° C. to 104° C. per second.
Claim 3
Dependent Claim
23 words
Method as claimed in claim 1 wherein boron and said at least one boride-forming metal are added in the form of master alloys.
Claim 4
Dependent Claim
46 words
Method as claimed in claim 1 or claim 2 wherein at least one element from at least one of the groups IV A, V A and VI A of the periodic system is used as said at least one boride-forming metal, either singly or in combination.
Claim 5
Dependent Claim
29 words
Method as claimed in claim 3 wherein boron and said at least one boride-forming metal are used in amounts to form 1 to 5 volume percent of metal boride.
Claim 6
Dependent Claim
30 words
Method as claimed in claim 4 wherein boron, titanium and zirconium are used in amounts to form a mixed boride of the composition Ti x Zr 1-x B 2 .
Claim 7
Dependent Claim
26 words
Method as claimed in claim 5 wherein rapid solidification is achieved by atomization of the melt using a gaseous or liquid medium or by melt spinning.
Claim 8
Dependent Claim
28 words
Method as claimed in claim 5 wherein an excess concentration over the stoichiometric composition of 3 to 30 percent of said at least one boride-forming metal is used.
Claim 9
Dependent Claim
29 words
Method as claimed in claim 1 wherein boron and said at least one boride-forming metal are used in amounts to form 1 to 5 volume percent of metal boride.
Claim 10
Dependent Claim
30 words
Method as claimed in claim 1 wherein boron, titanium and zirconium are used in amounts to form a mixed boride of the composition Ti x Zr 1-x B 2 .
Claim 11
Dependent Claim
26 words
Method as claimed in claim 1 wherein rapid solidification is achieved by atomization of the melt using a gaseous or liquid medium or by melt spinning.
Claim 12
Dependent Claim
28 words
Method as claimed in claim 1 wherein an excess concentration over the stoichiometric composition of 3 to 30 percent of said at least one boride-forming metal is used.
Claim 13
Dependent Claim
28 words
Method as claimed in claim 1 wherein an excess concentration over the stoichiometric composition of 5 to 20 percent of said at least one boride-forming metal is used.
Claim 14
Dependent Claim
18 words
Method as claimed in claim 3 wherein said at least one element is titanium or zirconium or both.
Claim 15
Dependent Claim
25 words
Method as claimed in claim 5 wherein said composition Ti x Zr 1-x B 2 is Ti 0 .7 Zr 0 .3 B 2 .
Claim 16
Dependent Claim
25 words
Method as claimed in claim 9 wherein said composition Ti x Zr 1-x B 2 is Ti 0 .7 Zr 0 .3 B 2 .
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-17 | 1991-11-16 | 1992-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-17 | 1995-11-16 | 1996-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-17 | 1999-11-16 | 2000-05-17 | $7700.00 | Window Closed / Lapsed |