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US4098576A
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Method for analyzing the latent gas content of metal samples
Assignee: National Steel Corp
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Filing: 1976-06-29
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Granted: 1978-07-04
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Expires: 1996-06-29
Abstract
Abstract A method for analyzing the latent gas content of metal samples, particularly the oxygen content of solidified samples of molten steel, which includes charging a crucible in a heat extraction furnace with a metal test specimen and sufficient metallic germanium to cause wetting of the specimen upon heating and disassociation of metallic oxides (or other metallic compounds including latent gaseous constituents) in the test specimen such that gases evolve and are quantitatively measured in conventional apparatus. When a test specimen is analyzed for oxygen content the evolved gas will be principally carbon dioxide, which is usually measured in a gas chromatograph.
Inventors
- 👤 James R. Judge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:02
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/20; G01N33/202; G01N33/2022; G01N33/2025
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
93 words
A method for determining the latent gas content of a metal sample which comprises charging a crucible with a metal specimen taken from the sample and a sufficient amount of metallic germanium to wet and alloy with the metal specimen upon heating, pyrolyzing the contents of the crucible in the presence of carbon so as to induce substantially complete disassociation of compounds having metal and latent gaseous constituents within the sample, and to produce the formation and release from the metal specimen of gaseous carbonaceous compounds, collecting and analyzing said gaseous carbonaceous compounds.
Claim 2
Independent Claim
93 words
A method for determining the latent gas content of a metal sample which comprises charging a crucible with a metal specimen taken from the sample and a sufficient amount of metallic germanium to wet and alloy with the metal specimen upon heating, pyrolyzing the contents of the crucible in the presence of carbon so as to induce substantially complete disassociation of compounds having metal and latent gaseous constituents within the sample, and to produce the formation and release from the metal specimen of gaseous carbonaceous compounds, collecting and analyzing said gaseous carbonaceous compounds.
Claim 3
Dependent Claim
25 words
The method of claim 1 wherein the test specimen contains metal oxides and a major proportion of the evolved gaseous carbonaceous compounds is carbon dioxide.
Claim 4
Dependent Claim
18 words
The method of claim 2 wherein the test specimen is taken from a solidified sample of molten steel.
Claim 5
Dependent Claim
21 words
The method of claim 2 wherein the metal oxides are of the group consisting of titanium, silicon, zirconium and aluminum oxides.
Claim 6
Dependent Claim
29 words
The method of claim 4 wherein the metal oxide is titanium oxide and the weight ratio of germanium to the test specimen is about 3 - 7.5 to 1.
Claim 7
Independent Claim
88 words
A method for determining the oxygen content of metal samples which includes charging a graphite crucible with a metal test specimen and a sufficient amount of metallic germanium to alloy with the test specimen and cause substantially complete disassociation of metallic oxides contained in the specimen upon heating, heating the graphite crucible in an inert gas atmosphere to a temperature above the melting point of the germanium-test specimen charge whereby gaseous carbon-oxygen compounds are formed, collecting the evolved gaseous compounds and analyzing the gaseous compounds for oxygen content.
Claim 8
Independent Claim
88 words
A method for determining the oxygen content of metal samples which includes charging a graphite crucible with a metal test specimen and a sufficient amount of metallic germanium to alloy with the test specimen and cause substantially complete disassociation of metallic oxides contained in the specimen upon heating, heating the graphite crucible in an inert gas atmosphere to a temperature above the melting point of the germanium-test specimen charge whereby gaseous carbon-oxygen compounds are formed, collecting the evolved gaseous compounds and analyzing the gaseous compounds for oxygen content.
Claim 9
Dependent Claim
14 words
The method of claim 6 wherein the evolved gaseous carbon-oxygen compound is carbon dioxide.
Claim 10
Dependent Claim
22 words
The method of claim 6 wherein the metal oxides are included in the group consisting of titanium, silicon, zirconium, and aluminum oxides.
Claim 11
Dependent Claim
27 words
The method of claim 8 wherein the metal oxide is titanium oxide and the weight ratio of germanium to test specimen is 3 - 7.5 to 1.
Claim 12
Dependent Claim
31 words
The method of claim 6 wherein the heating of the graphite crucible is conducted in an induction furnace and the temperature is raised to a point in excess of 2000° C.
Claim 13
Dependent Claim
16 words
The method of claim 6 wherein the inert gas is selected from nitrogen, argon and helium.
Claim 14
Dependent Claim
18 words
A method as defined in claim 6 wherein the metal sample is a solidified sample of molten steel.
Claim 15
Independent Claim
99 words
A method for determining the oxygen content of a solidified sample of molten steel comprising, charging a graphite crucible with a test specimen of the solidified sample, and a sufficient amount of metallic germanium to wet and alloy with the test specimen and cause substantially complete disassociation of metallic oxides contained in the specimen upon heating, inductively heating the graphite crucible in an inert gas atmosphere to a temperature above the melting point of the germanium and the test specimen whereby gaseous carbon-oxygen compounds are formed, collecting the evolved gaseous compounds and analyzing the gaseous compounds for oxygen content.
Claim 16
Independent Claim
99 words
A method for determining the oxygen content of a solidified sample of molten steel comprising, charging a graphite crucible with a test specimen of the solidified sample, and a sufficient amount of metallic germanium to wet and alloy with the test specimen and cause substantially complete disassociation of metallic oxides contained in the specimen upon heating, inductively heating the graphite crucible in an inert gas atmosphere to a temperature above the melting point of the germanium and the test specimen whereby gaseous carbon-oxygen compounds are formed, collecting the evolved gaseous compounds and analyzing the gaseous compounds for oxygen content.
Claim 17
Dependent Claim
14 words
The method of claim 13 wherein the evolved gaseous carbon-oxygen compound is carbon dioxide.
Claim 18
Dependent Claim
23 words
The method of claim 13 wherein the metal oxides are included in the group consisting of titanium, silicon, zirconium, aluminum and germanic oxides.
Claim 19
Dependent Claim
27 words
The method of claim 15 wherein the metal oxide is titanium oxide and the weight ratio of germanium to said oxide is 3 - 7.5 to 1.
Claim 20
Dependent Claim
18 words
The method of claim 13 wherein the graphite crucible is heated to a temperature of about 2760° C.
Claim 21
Dependent Claim
16 words
The method of claim 13 wherein the inert gas is selected from nitrogen, argon and helium.
Claim 22
Independent Claim
112 words
A method for determining the oxygen content of a solidified sample of molten steel comprising, charging a graphite crucible with (a) a test specimen of the solidified sample, and (b) a sufficient amount of metallic germanium to wet and alloy with the test specimen and cause substantially complete disassociation of metallic oxides contained in the specimen upon heating, heating the graphite crucible in an inert gas atmosphere within an induction furnace to a temperature of about 2760° C. such that the oxygen constituents of the metallic oxides are liberated and form carbon dioxide, purging the carbon dioxide from the furnace to a chromatographic analyzer and, analyzing the carbon dioxide for oxygen content.
Claim 23
Independent Claim
112 words
A method for determining the oxygen content of a solidified sample of molten steel comprising, charging a graphite crucible with (a) a test specimen of the solidified sample, and (b) a sufficient amount of metallic germanium to wet and alloy with the test specimen and cause substantially complete disassociation of metallic oxides contained in the specimen upon heating, heating the graphite crucible in an inert gas atmosphere within an induction furnace to a temperature of about 2760° C. such that the oxygen constituents of the metallic oxides are liberated and form carbon dioxide, purging the carbon dioxide from the furnace to a chromatographic analyzer and, analyzing the carbon dioxide for oxygen content.
References Cited (Backward Citations)
US3681972A
Cited
US3820380A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-03 | 1982-01-02 | 1982-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-03 | 1986-01-02 | 1986-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-03 | 1990-01-02 | 1990-07-04 | $7700.00 | Window Closed / Lapsed |