US3854940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroconductive, corrosion resistant high silicon alloy
Assignee: PPG Industries Inc
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Filing: 1973-08-27
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Granted: 1974-12-17
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Expires: 1993-08-27
Abstract
Abstract Disclosed is a silicon base alloy containing sufficient dopant to provide an electrical conductivity in excess of 100 (ohmcentimeters) 1, and sufficient transition group metal to provide a volumetric coefficient of expansion upon solidification of less than about 10 percent, and balance silicon.
Inventors
- 👤 H Hoekje
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:49
CPC Classifications
C; C22; C22C; C22C28/00; C25; C25B; C25B11/00; C25B11/04
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
61 words
A SILICON BASE ALLOY HAVING AN ELECTROCONDUCTIVITY GREATER THAN 100 (OHM-CENTIMETERS)-1, CONSISTING ESSENTIALLY OF SILICON, A DOPANT, AND TRANSITION METAL PRESENT AS THE SILICIDE THEREOF, AND COMPRISING: A PREDOMINANT, DISCONTINOUS SILICON RICH PAHSE; DISCRETE NODULES OF A DOPANT RICH PHASE; AND SUBSTATIALLY CONTINUOUS RIVULETS OF A TRANSITION METAL SILICIDE RICH PAHSE SURROUNDING THE SILICON RICH PHASE AND FORMING THE BOUNDARIES THEREOF.
Claim 2
Dependent Claim
61 words
A SILICON BASE ALLOY HAVING AN ELECTROCONDUCTIVITY GREATER THAN 100 (OHM-CENTIMETERS)-1, CONSISTING ESSENTIALLY OF SILICON, A DOPANT, AND TRANSITION METAL PRESENT AS THE SILICIDE THEREOF, AND COMPRISING: A PREDOMINANT, DISCONTINOUS SILICON RICH PAHSE; DISCRETE NODULES OF A DOPANT RICH PHASE; AND SUBSTATIALLY CONTINUOUS RIVULETS OF A TRANSITION METAL SILICIDE RICH PAHSE SURROUNDING THE SILICON RICH PHASE AND FORMING THE BOUNDARIES THEREOF.
Claim 3
Dependent Claim
18 words
The alloy of claim 1 wherein the dopant is chosen from the group consisting of boron and phosphorous.
Claim 4
Dependent Claim
19 words
The alloy of claim 2 wherein the dopant content is greater than the solubility of the dopant in silicon.
Claim 5
Dependent Claim
16 words
The alloy of claim 2 wherein the dopant content is from 0.2 to 2.0 weight percent.
Claim 6
Dependent Claim
23 words
The alloy of claim 1 wherein the transition metal is chosen from the group consisting of iron, cobalt, nickel, chromium, molybdenum and manganese.
Claim 7
Dependent Claim
21 words
The alloy of claim 5 wherein the transition metal content is greater than the solubility of the transition metal in silicon.
Claim 8
Dependent Claim
24 words
The alloy of claim 5 wherein the transition metal is iron and the iron content is from about 4 to about 14 weight percent.
Claim 9
Dependent Claim
21 words
The alloy of claim 1 wherein the alloy has a volumetric coefficient of expansion upon solidification of less than 10 percent.
Claim 10
Dependent Claim
38 words
A silicon alloy consisting essentially of sufficient dopant to provide an electrical conductivity of greater than about 100 (ohm-centimeters) 1, sufficient transition metal silicide to provide an expansion on solidification of less than 5 percent, and balance silicon.
Claim 11
Dependent Claim
38 words
A silicon alloy consisting essentially of sufficient dopant to provide an electrical conductivity of greater than about 100 (ohm-centimeters) 1, sufficient transition metal silicide to provide an expansion on solidification of less than 5 percent, and balance silicon.
Claim 12
Dependent Claim
19 words
The alloy of claim 9 wherein the dopant content is chosen from the group consisting of boron and phosphorous.
Claim 13
Dependent Claim
19 words
The alloy of claim 10 wherein the dopant content is greater than the solubIlity of the dopant is silicon.
Claim 14
Dependent Claim
23 words
The alloy of claim 11 wherein the dopant is boron and the dopant content is from about 0.1 to about 2.0 weight percent.
Claim 15
Dependent Claim
26 words
The alloy of claim 9 wherein the transition metal silicide is chosen from thhe group consisting of the silicides of iron, cobalt, nickel, chromium, and manganese.
Claim 16
Dependent Claim
35 words
The alloy of claim 13 wherein the content of the transition metal silicide is greater than the solubility of the transition metal silicide in silicon but insufficient to form a predominant transition metal silicide phase.
Claim 17
Dependent Claim
32 words
The alloy of claim 14 wherein the transition metal is iron and the content of the transition metal in the alloy, elemental basis, is from about 4 to about 14 weight percent.
Claim 18
Dependent Claim
50 words
The alloy of claim 9 wherein the alloy comprises: a predominant, discontinuous, silicon rich phase; discrete nodules of a dopant rich phase within the boundaries of the silicon rich phase; substantially continuous rivulets of a transition metal silicide rich phase surrounding the silicon rich phase and forming the boundaries thereof.
References Cited (Backward Citations)
US3491014A
Cited
NL7003774A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |