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Patent US3811929A successfully refreshed from Google Patents.
US3811929A
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Metallic cementation
Assignee: Kito KK
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Filing: 1971-03-02
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Granted: 1974-05-21
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Expires: 1991-03-02
Abstract
Abstract Process for cementation of iron or steel by heat treatment in a chamber with fine particles of chromium, titanium or silicon halide suspended in an inert atmosphere.
Inventors
- 👤 N Kanetake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:02
CPC Classifications
C; C23; C23C; C23C10/00; C23C10/18; C23C12/00; C23C12/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
96 words
Process of metallic cementation of a work, which comprises performing said metallic cementation by coating the work composed of iron or steel heated to cementation temperature in a treatment chamber with volatile metallic halide selected from the group consisting of halides of chromium, titanium and silicon, maintaining said halide suspended as fine particles in an inert atmosphere mainly in a partially fused state, and cooling the so-cemented work in a cooling chamber containing a non-oxidizing gas in which by-products comprising iron halide are removed, whereby said work so coated is protected against corrosion, heat and wear.
Claim 2
Dependent Claim
123 words
Process of metallic cementation of a work, which comprises performing said metallic cementation by coating the work composed of iron or steel heated to cementation temperature in a treatment chamber with volatile metallic halide selected from the group consisting of halides of chromium, titanium, and silicon, and maintaining said halide suspended as fine particles in an inert atmosphere mainly in a partially fused state, and successively quenching the so-cemented work and successively utilizing for the quenching the heat produced by the treatment at the required quenching temperature of 180* - 600*C, said quenching being performed in a quenching chamber containing a non-oxidizing gas in which by-products comprising iron halide are removed, whereby said work so coated is protected against corrosion, heat and wear.
Claim 3
Dependent Claim
104 words
Process for surface treatment of iron and steel products, which comprises treating and coating the iron and steel products heated to cementation temperature in an inert atmosphere with fine particles of metallic halide selected from the group consisting of chromium, titanium and silicon halides, said particles being suspended in a partially fused state, and forming a metallic diffusing zone on the surface of said iron and steel products'' matrix, and then adding fine particles of carbon to said atmosphere, whereby a carbide of said metal is dispersed on the surface of said diffusing zone and said product is protected against corrosion, heat and wear.
Claim 4
Dependent Claim
132 words
Process for surface treatment of iron and steel products, which comprises coating said products heated to cementation temperature by forming a carburizing zone or a carbonitriding zone on the surface of said iron and steel products'' matrix by carburizing or carbonitriding the iron and steel products beforehand, and then treating those iron and steel products in an inert atmosphere with fine particles of metallic halide, said particles being suspended and being selected from the group consisting of chromium, titanium, and silicon, whereby said particles impart to said products corrosion resistance, heat resistance, and/or wear resistance, and are suspended mainly in a partially fused state, whereby said metal is cemented on the surface of said carburizing zone or carbonitrizing zone and the metallic carbide is dispersed on the surface of a diffusing zone.
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) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |