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US4139673A
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Surface-coated blast furnace tuyere made of copper or copper alloy and method of surface-coating the same
Assignee: Nihon Karoraizu Kogyo KK
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Filing: 1977-08-16
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Granted: 1979-02-13
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Expires: 1997-08-16
Abstract
Abstract The invention relates to a surface-coated blast furnace tuyere made of copper or copper alloy capable of sufficiently resisting heat attack and abrasion attack caused by the splashing of molten metal and slag. The invention also relates to a method of surface-coating the tuyere with advantages both in process steps and in economy.
Inventors
- 👤 Yutaka Ohmae
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:13
CPC Classifications
C; C23; C23C; C23C10/00; C23C10/28; C23C10/34; C23C10/52; C21; C21B; C21B7/00; C21B7/16; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
52 words
A copper or copper alloy tuyere having Fe and Al diffused into the upper surface thereof thereby forming a diffusion-penetration layer, and a sintered layer disposed on diffusion penetration layer, said sintered layer formed from (i) a dystectic point metallic oxide powder, (ii) an Fe-Al alloy powder, and (iii) a Cu-Fe-Al alloy.
Claim 2
Dependent Claim
52 words
A copper or copper alloy tuyere having Fe and Al diffused into the upper surface thereof thereby forming a diffusion-penetration layer, and a sintered layer disposed on diffusion penetration layer, said sintered layer formed from (i) a dystectic point metallic oxide powder, (ii) an Fe-Al alloy powder, and (iii) a Cu-Fe-Al alloy.
Claim 3
Dependent Claim
142 words
An alloy tuyere according to claim 1 wherein said diffusion-penetration layer and said sintered layer are formed by coating a surface of said tuyere with a mixture of (a) 25 to 35 parts of an oxide powder selected from the group consisting of Al 2 O 3 , ZrO 2 , TiO 2 , Cr 2 O 3 , SiO 2 , ThO 2 , and MgO; (b) 2 to 5 parts of Al powder; (c) 60 to 72 parts of Fe-Al alloy powder; and (d) 0.3 to 0.5 parts of an ammonium halide, and maintaining said coated tuyere at a temperature of 700° to 950° C. in an inert atmosphere for a sufficient time to cause said sintered layer to be formed and to diffuse the Al component and Fe component of the said mixture into the surface of said tuyere.
Claim 4
Dependent Claim
34 words
An alloy tuyere according to claim 2 wherein said oxide powder is 100 to 250 mesh, said Al powder is 80 to 100 mesh and said Fe-Al alloy powder is 30 to 100 mesh.
Claim 5
Dependent Claim
18 words
A tuyere according to claim 3 wherein said sintered layer is at least 500 to 700μ in thickness.
Claim 6
Dependent Claim
16 words
A tuyere according to claim 3 wherein said diffusion-penetration layer is more than 1000μ in thickness.
Claim 7
Dependent Claim
53 words
A tuyere according to claim 3 wherein said Fe-Al alloy powder is 30 to 100 mesh, and said dystectic metallic oxide powder is selected from the group consisting of Al 2 O 3 , ZrO 2 , TiO 2 , Cr 2 O 3 , SiO 2 , ThO 2 , and MgO.
Claim 8
Dependent Claim
16 words
A tuyere according to claim 3 wherein said Cu-Fe-Al alloy is disposed in said sintered layer.
Claim 9
Dependent Claim
21 words
A tuyere according to claim 3 when said Cu-Fe-Al alloy is absorbed into said metallic oxide powder in said sintered layer.
Claim 10
Dependent Claim
26 words
A tuyere according to claim 3 wherein said tuyere is provided with a ceramic heat-resisting coated layer of Al 2 O 3 and SiO 2 .
Claim 11
Dependent Claim
32 words
A tuyere according to claim 9 wherein said ceramic heat-resistant layer is made of 40 to 60 weight percent Al 2 O 3 and 60 to 40 weight percent SiO 2 .
Claim 12
Independent Claim
151 words
A method of surface-coating a copper or a copper alloy made tuyere for a blast furnace, said method being characterized by: (a) coating said tuyere with a coating material, said coating material being made of 25 to 35 parts of a dystectic point metallic oxide powder selected from Al 2 O 3 , ZrO 2 , TiO 2 , Cr 2 O 3 , SiO 2 , ThO 2 , MgO, 2 to 5 parts of metallic Al powder, 60 to 72 parts of Fe-Al alloy powder, 0.3 to 0.5 parts of an ammonium halide; and (b) maintaining said coating material at a temperature in the range of 700° to 950° C. for several hours in an inert atmosphere further sintering said coating material to said tuyere surface so as to diffuse and penetrate the Al component and Fe component contained in said coating material beneath the surface of said tuyere.
Claim 13
Independent Claim
151 words
A method of surface-coating a copper or a copper alloy made tuyere for a blast furnace, said method being characterized by: (a) coating said tuyere with a coating material, said coating material being made of 25 to 35 parts of a dystectic point metallic oxide powder selected from Al 2 O 3 , ZrO 2 , TiO 2 , Cr 2 O 3 , SiO 2 , ThO 2 , MgO, 2 to 5 parts of metallic Al powder, 60 to 72 parts of Fe-Al alloy powder, 0.3 to 0.5 parts of an ammonium halide; and (b) maintaining said coating material at a temperature in the range of 700° to 950° C. for several hours in an inert atmosphere further sintering said coating material to said tuyere surface so as to diffuse and penetrate the Al component and Fe component contained in said coating material beneath the surface of said tuyere.
Claim 14
Dependent Claim
39 words
A method of surface-coating according to claim 9 wherein said dystectic point metallic oxide powder is 100 to 250 mesh, said metallic Al powder is 80 to 100 mesh, and said Fe-A alloy powder is 30 to 100 mesh.
References Cited (Backward Citations)
US2988807A
Cited
US3564565A
Cited
US3340026A
Cited
US3415631A
Cited
JPS4827056A
Cited
US3891784A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-12 | 1982-08-14 | 1983-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-12 | 1986-08-14 | 1987-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-12 | 1990-08-14 | 1991-02-13 | $7700.00 | Window Closed / Lapsed |