JPS55148765A - Controlling unit of atmosphere in nitriding furnace - Google Patents
Controlling unit of atmosphere in nitriding furnaceInfo
- Publication number
- JPS55148765A JPS55148765A JP5634379A JP5634379A JPS55148765A JP S55148765 A JPS55148765 A JP S55148765A JP 5634379 A JP5634379 A JP 5634379A JP 5634379 A JP5634379 A JP 5634379A JP S55148765 A JPS55148765 A JP S55148765A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- ammonia
- furnace
- atmosphere
- ratio
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
PURPOSE:To keep correctly the atmosphere in a furnace at a proper value so as to improve the quality of product, by controlling the quantities of ammonia and air, which are sent to the furnace in accordance with the calculated decomposition ratio of ammonia, and the water content of the atmosphere gas in the furnace. CONSTITUTION:Ammonia gas and air are sent into a nitriding furnace 5 through an inlet pipe 3 of the furnace, where the ammonia gas is thermally and chemically decomposed to form an atmosphere gas in the furnace and is discharged through an outlet 4, a portion being introduced through a pipe 10 to an absorbing tower 11. The aqueous soln. contained in the absorbing tower 11, undecomposed ammonia, and steam in the atmosphere form aqueous ammonia, which is separated from the atmosphere gas, only small quantities of hydrogen gas and nitrogen gas being exhausted through a gas outlet pipe 9 accompanied by trace amount of water. The temp. of the gases is input as the dew point to an arithmetic unit 20, where it is converted to water ratio. The computed value is fed as signals 23 to an indicator 24, where it is converted to the decomposition ratio of ammonia gas. When calculation is conducted by introduction of the ammonia decomposition ratio, the signals 23 shows water ratio, hereby water ratio of the atmosphere gas in the furnace is shown by the indicator 24.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5634379A JPS55148765A (en) | 1979-05-10 | 1979-05-10 | Controlling unit of atmosphere in nitriding furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5634379A JPS55148765A (en) | 1979-05-10 | 1979-05-10 | Controlling unit of atmosphere in nitriding furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS55148765A true JPS55148765A (en) | 1980-11-19 |
Family
ID=13024576
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5634379A Pending JPS55148765A (en) | 1979-05-10 | 1979-05-10 | Controlling unit of atmosphere in nitriding furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55148765A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03122262A (en) * | 1989-10-06 | 1991-05-24 | Nippon Steel Corp | Method for controlling extent of nitriding of grain-oriented electrical steel sheet |
| KR100399224B1 (en) * | 1999-12-27 | 2003-09-22 | 주식회사 포스코 | Method for the formation of atmospheric gasses with low dew point |
| KR101194670B1 (en) | 2010-05-17 | 2012-10-29 | 서울질화(주) | Nitriding furnace |
-
1979
- 1979-05-10 JP JP5634379A patent/JPS55148765A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03122262A (en) * | 1989-10-06 | 1991-05-24 | Nippon Steel Corp | Method for controlling extent of nitriding of grain-oriented electrical steel sheet |
| KR100399224B1 (en) * | 1999-12-27 | 2003-09-22 | 주식회사 포스코 | Method for the formation of atmospheric gasses with low dew point |
| KR101194670B1 (en) | 2010-05-17 | 2012-10-29 | 서울질화(주) | Nitriding furnace |
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