JPS63190103A - Method for controlling carbon potential in sintering furnace - Google Patents
Method for controlling carbon potential in sintering furnaceInfo
- Publication number
- JPS63190103A JPS63190103A JP2000587A JP2000587A JPS63190103A JP S63190103 A JPS63190103 A JP S63190103A JP 2000587 A JP2000587 A JP 2000587A JP 2000587 A JP2000587 A JP 2000587A JP S63190103 A JPS63190103 A JP S63190103A
- Authority
- JP
- Japan
- Prior art keywords
- chamber
- amt
- carbon
- chambers
- sintering furnace
- 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
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 25
- 238000005245 sintering Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 45
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 22
- 239000001569 carbon dioxide Substances 0.000 claims description 22
- 238000010304 firing Methods 0.000 claims description 19
- 238000000137 annealing Methods 0.000 claims description 6
- 238000010583 slow cooling Methods 0.000 abstract description 8
- 230000000704 physical effect Effects 0.000 abstract description 6
- 239000007789 gas Substances 0.000 description 20
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 16
- 238000001514 detection method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910002090 carbon oxide Inorganic materials 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000005255 carburizing Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- -1 for example Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野〕
本発明は、主として、予焼室、本焼室及び徐冷室を有し
、かつ焼結体を連続的に製造する焼結炉において、各室
内のカーボンポテンシャル（雰囲気中の炭素量）を制御
する＆１１御方法に圓する。Detailed Description of the Invention (Industrial Application Field) The present invention mainly relates to a sintering furnace that has a pre-firing chamber, a final firing chamber, and an annealing chamber, and that continuously manufactures sintered bodies. The method is based on &11 to control the carbon potential (amount of carbon in the atmosphere) in each room.
従来、この種の連続焼結炉、例えば、メツシュベルト式
の焼結炉においては、予焼室、本焼室及び徐冷室内を正
圧に保持し、かつ酸化を防止するために還元性のガスが
供給されている。ぞして、この還元性ガスとしては、例
えば、天然ガス（メタン主成分）と空気とを約１０５０
〜１１００℃に加熱し、ニッケルを触媒として生成した
水素（＋１２）４０％、−酸化炭素（Ｃｏ）２０％、窒
素（Ｎ２）３８％を主成分としたものが使用されている
。Conventionally, in this type of continuous sintering furnace, for example, a mesh belt type sintering furnace, reducing gas is used to maintain positive pressure in the pre-firing chamber, final firing chamber, and slow cooling chamber, and to prevent oxidation. is supplied. Therefore, as this reducing gas, for example, natural gas (methane main component) and air are mixed at a ratio of about 1050
The main components used are 40% hydrogen (+12), 20% -carbon oxide (Co), and 38% nitrogen (N2), which are heated to ~1100°C and generated using nickel as a catalyst.
（発明が解決しようとする問題点）
ところで、焼結体の寸法及び物性は、焼結炉内の雰囲気
、温度条件によって左右され、例えば、ＦＯ−Ｃ系、Ｆ
ｅ−Ｃ−Ｃｕ系の焼結体においては、含有する炭素量に
よって焼結体の寸法及び物性が大幅に変化する。このた
め、従来は、本焼室内の雰囲気中の炭素量、カーボンポ
テンシャルを一定に保つことが試みられたが、でき上が
った製品の品質は、十分に安定したものとはならなかっ
た。(Problems to be Solved by the Invention) By the way, the dimensions and physical properties of the sintered body depend on the atmosphere and temperature conditions in the sintering furnace.
In e-C-Cu-based sintered bodies, the dimensions and physical properties of the sintered bodies vary significantly depending on the amount of carbon contained. For this reason, conventional attempts have been made to keep the carbon content and carbon potential in the atmosphere within the firing chamber constant, but the quality of the finished product has not been sufficiently stable.
本発明は、上記事情に鑑みてなされたもので、その目的
とづるところは、寸法精瓜及び物性が安定し、かつ品質
の良好な製品が確実にｆ７られる焼結炉におけるカーボ
ンポテンシャル制御方法を提供することにある。The present invention has been made in view of the above circumstances, and its purpose is to provide a carbon potential control method in a sintering furnace that can ensure stable dimensional refinement and physical properties and produce products of good quality. It is about providing.
（問題点を解決するための手段〕
上記目的を達成するために、本発明は、予焼室、本焼室
及び徐冷室内に、それぞれ二酸化炭素を検出するセンサ
ーを配置し、これらのセンサーが検出する二酸化炭素量
に阜づいて、上記各室内に供給する雰囲気ガスの伍を制
御することにより、各室内のカーボンポテンシャルを所
定値にそれぞれ保持するものである。(Means for Solving the Problems) In order to achieve the above object, the present invention arranges sensors for detecting carbon dioxide in each of the pre-burning chamber, the final baking chamber and the slow cooling chamber, and these sensors The carbon potential in each chamber is maintained at a predetermined value by controlling the level of atmospheric gas supplied to each chamber according to the detected amount of carbon dioxide.
（作 用）
本発明の焼結炉におけるカーボンポテンシャル制御方法
にあっては、予焼室、本焼室及び徐冷室内の二酸化炭素
ｍをそれぞれ検出し、これらの二酸化炭素量に基づいて
、各室内に供給する炭素６ｉを制御し、各室内のカーボ
ンポテンシャルを所定値に保持する。(Function) In the carbon potential control method in a sintering furnace of the present invention, carbon dioxide m in the prefiring chamber, final firing chamber, and slow cooling chamber is detected, and each carbon dioxide m is detected based on these carbon dioxide amounts. The carbon 6i supplied into the room is controlled to maintain the carbon potential in each room at a predetermined value.
以下、第１図と第２図に基づいて本発明の一実施例を説
明する。Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 and 2.
図中符号１はメツシュベルト式連続焼結炉であり、この
メツシュベルト式連続焼結炉１は、炉体２内が仕切板（
バッフルプレート）３で予焼室４、本焼室５及び徐冷室
６に分けられると共に、これらの室４．５．６内を連続
的に無端状のメツシュベルト７が移動して圧粉体を搬送
焼結するようになっている。Reference numeral 1 in the figure is a mesh belt type continuous sintering furnace, and this mesh belt type continuous sintering furnace 1 has a partition plate (
A baffle plate) 3 divides the compact into a pre-firing chamber 4, a final firing chamber 5, and an annealing chamber 6, and an endless mesh belt 7 moves continuously within these chambers 4,5,6 to convey the green compact. It is designed to be transported and sintered.
上記各室４．５．６内には、手動弁８を介してそれぞれ
還元性ガス供給源９から還元性ガス（水素４０％、−酸
化炭素２０％、窒素３８％）が供給されていると共に、
エンリッチガス供給源１０からメタンガスが電磁弁１１
を介してそれぞれ供給されるようになっている。また、
各室４，５゜６には、二酸化炭素検出用の検出端１２が
それぞれ配置されており、これらの検出端１２″Ｃ採取
されたガスは、赤外線吸収式の二酸化炭素計１３に導か
れ、二酸化炭素量が計測されるようになっている。そし
て、各二酸化炭素計１３からの信号は、電磁弁１１の操
作を制御するコントローラ１４にそれぞれ入力されてお
り、各コントローラ１４は、上記各二酸化炭素計１３の
計測値とあらかじめ設定値Ｃ＋ 、Ｃ２＊ ０３とが一
致するように電磁弁１１を制御して、各室４．５．６内
に供給するメタンガス晴を調整するようになっている。Reducing gas (40% hydrogen, -20% carbon oxide, 38% nitrogen) is supplied into each of the above chambers 4,5,6 from a reducing gas supply source 9 via a manual valve 8. ,
Methane gas is supplied from the enriched gas supply source 10 to the solenoid valve 11
They are supplied through the respective channels. Also,
A detection end 12 for detecting carbon dioxide is arranged in each chamber 4, 5゜6, and the gas collected by these detection ends 12''C is led to an infrared absorption type carbon dioxide meter 13. The amount of carbon dioxide is measured.The signals from each carbon dioxide meter 13 are input to a controller 14 that controls the operation of the electromagnetic valve 11, and each controller 14 is configured to measure the amount of carbon dioxide. The solenoid valve 11 is controlled so that the measured value of the carbon meter 13 matches the preset values C+, C2*03, and the methane gas venting to be supplied into each chamber 4.5.6 is adjusted. .
なお、上記予焼室４内に供給される還元性ガス及びメタ
ンガスの吹出し口は予焼室４の入口側に向けると共に、
徐冷室６内に供給される還元性ガス及びメタンガスの吹
出し口は徐冷ｖ６の出口側に向けて配置されている。ま
た、予焼９４内の検出端１２は本焼室５寄りに設置され
ている。Note that the outlets for the reducing gas and methane gas supplied into the pre-burning chamber 4 are directed toward the entrance side of the pre-burning chamber 4, and
The outlets for the reducing gas and methane gas supplied into the slow cooling chamber 6 are arranged toward the exit side of the slow cooling v6. Further, the detection end 12 within the pre-firing 94 is installed closer to the final firing chamber 5.
次に、上記のように構成されたメツシュベルト式連続焼
結炉１を用いて本発明の方法を実施する場合について説
明する。Next, a case will be described in which the method of the present invention is implemented using the mesh belt type continuous sintering furnace 1 configured as described above.
まず、炉体２内の各室４．５．６には、それぞれ手動弁
８を介して所定量の還元性ガスが供給されている状態に
おいて、従来同様、駆動されているメツシュベルト７上
に圧粉体（被焼結体）を載置搬送して、予焼室４、本焼
室５、徐冷室６の順に連続的に通過させて加熱し、焼結
を行なう。First, in a state where a predetermined amount of reducing gas is supplied to each chamber 4, 5, 6 in the furnace body 2 through the manual valve 8, pressure is applied to the mesh belt 7 being driven, as in the conventional case. The powder (body to be sintered) is placed and conveyed, and is passed through a pre-firing chamber 4, a final firing chamber 5, and an annealing chamber 6 in this order to be heated and sintered.
この場合、炉体２内の各室４．５．６においては、
ＧＯ２＋ ト１２１士 ＣＯ＋Ｈ２０
の可逆反応が成立しており、その平衡条件は、であられ
せる。ここで、−酸化炭素及び水素は上記還元性ガス供
給源９から常時所定間が供給されているから一定であり
、従って、
水蒸気の分圧／二酸化炭素の分圧−一定となり、二酸化
炭素の分圧がわかれば、炉体２の各室４．５．６内の雰
囲気ガスの状態が把握できる。そして、この二酸化炭素
の分圧が凸くなると（カーボンポテンシャルが小さくな
ると）、被焼結体には脱炭作用として働き、また、二Ｒ
（ヒ炭素の分圧が低くなると、被焼結体には浸炭作用と
して働く。In this case, in each chamber 4.5.6 in the furnace body 2, a reversible reaction of GO2+ and CO+H20 is established, and the equilibrium condition is as follows. Here, -carbon oxide and hydrogen are always supplied from the reducing gas supply source 9 for a predetermined period of time, so they are constant, so the partial pressure of water vapor/partial pressure of carbon dioxide-is constant, and the partial pressure of carbon dioxide is constant. If the pressure is known, the state of the atmospheric gas in each chamber 4.5.6 of the furnace body 2 can be grasped. When the partial pressure of this carbon dioxide increases (when the carbon potential decreases), it acts as a decarburizing effect on the sintered body, and also
(When the partial pressure of carbon is lowered, it acts as a carburizing effect on the body to be sintered.
そこで、各二酸化炭素ｆｆ１１１３によって計測された
各室４．５．６の二酸化炭素の検出値と、各コントロー
ラ１４に設定された設定ＩＣ＋、Ｃ２゜Ｃ３とを比較し
、その結果、二酸化炭素の検出値が大きい場合には、各
コントローラ１４がそれぞれ個々に各電磁弁１１を操作
してメタンガスを各室４．５．６に供給すると共に、上
記検出値が小さい場合には、メタンガスの供給を停止す
る。これにより、各室４，５．６の二酸化炭素ｆｆ１（
カーボンポテンシャル）はあらかじめ設定された値に保
持されるから、連続して焼結されている製品の寸法及び
物性が安定化して品質の良好な製品が円滑に得られる。Therefore, the detected value of carbon dioxide in each chamber 4.5.6 measured by each carbon dioxide ff1113 is compared with the setting IC+, C2°C3 set in each controller 14, and as a result, the detected value of carbon dioxide is If the detected value is large, each controller 14 individually operates each electromagnetic valve 11 to supply methane gas to each chamber 4.5.6, and if the detected value is small, the supply of methane gas is stopped. do. As a result, carbon dioxide ff1(
Since the carbon potential (carbon potential) is maintained at a preset value, the dimensions and physical properties of the continuously sintered products are stabilized, and products of good quality can be smoothly obtained.
また、各室４，５．６はそれぞれ仕切機３で仕切られて
いるから、各室４，５．６内での雰囲気の制御性が向上
する。Moreover, since each chamber 4, 5.6 is partitioned off by the partition machine 3, the controllability of the atmosphere within each chamber 4, 5.6 is improved.
以上説明したように、本発明は、予焼室、本焼室及び徐
冷室内に、それぞれ二酸化炭素を検出するセンサーを配
置し、これらのセンサーが検出する二酸化炭素量に基づ
いて、上記各室内に供給覆る雰囲気ガスの吊をそれぞれ
個別に制御することにより、各室内のカーボンポテンシ
ャルをそれぞれ所定値に保持することができる。従って
、所定の寸法及び物性の焼結体を安定的にかつ連続して
得ることができるという優れた効果を右する。As explained above, the present invention arranges sensors for detecting carbon dioxide in each of the pre-burning chamber, the main-firing chamber, and the slow-cooling chamber, and detects the amount of carbon dioxide in each of the above rooms based on the amount of carbon dioxide detected by these sensors. By individually controlling the supply of atmospheric gas to each room, the carbon potential in each room can be maintained at a predetermined value. Therefore, it has an excellent effect of being able to stably and continuously obtain a sintered body having predetermined dimensions and physical properties.
第１図と第２図は本発明の一実施Ｍを示すもので、第１
図は概略構成図、第２図は側面図である。
１・・・・・・メツシュベルト式連続焼結炉、４・・・
・・・予焼室、５・・・・・・本焼室、６・・・・・・
徐冷室、１０・・・・・・エンリッチガス供給源、１１
・・・・・・電磁弁、１２・・・・・・検出端、１３・
・・・・・二酸化炭素計、１４・・・・・・コントロー
ラ。FIG. 1 and FIG. 2 show one embodiment M of the present invention.
The figure is a schematic configuration diagram, and FIG. 2 is a side view. 1... Metschbelt type continuous sintering furnace, 4...
...Pre-firing room, 5...Final firing room, 6...
Annealing chamber, 10...Enriched gas supply source, 11
...Solenoid valve, 12...Detection end, 13.
...Carbon dioxide meter, 14...Controller.
Claims (1)
造する焼結炉におけるカーボンポテンシャル制御方法に
おいて、上記予焼室、本焼室及び徐冷室内に、それぞれ
二酸化炭素を検出するセンサーを配置し、これらのセン
サーが検出する二酸化炭素量に基づいて、上記各室内に
供給する雰囲気ガスの量を個別に制御することにより、
該各室内のカーボンポテンシャルを所定値にそれぞれ保
持することを特徴とする焼結炉におけるカーボンポテン
シャル制御方法。In a carbon potential control method in a sintering furnace that has a pre-firing chamber, a final firing chamber, and an annealing chamber and continuously manufactures sintered bodies, carbon dioxide is contained in each of the pre-firing chamber, the final firing chamber, and the annealing chamber. By arranging sensors that detect carbon and individually controlling the amount of atmospheric gas supplied to each of the above rooms based on the amount of carbon dioxide detected by these sensors,
A method for controlling carbon potential in a sintering furnace, characterized in that the carbon potential in each chamber is maintained at a predetermined value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000587A JPS63190103A (en) | 1987-01-30 | 1987-01-30 | Method for controlling carbon potential in sintering furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000587A JPS63190103A (en) | 1987-01-30 | 1987-01-30 | Method for controlling carbon potential in sintering furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63190103A true JPS63190103A (en) | 1988-08-05 |
Family
ID=12015014
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000587A Pending JPS63190103A (en) | 1987-01-30 | 1987-01-30 | Method for controlling carbon potential in sintering furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63190103A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07118705A (en) * | 1993-10-19 | 1995-05-09 | Kanagawa Pref Gov | Method for controlling carbon content of metal powder compact |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS492707A (en) * | 1972-04-27 | 1974-01-11 | ||
| JPS6013002A (en) * | 1983-07-05 | 1985-01-23 | Mitsubishi Metal Corp | Continuous sintering furnace |
-
1987
- 1987-01-30 JP JP2000587A patent/JPS63190103A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS492707A (en) * | 1972-04-27 | 1974-01-11 | ||
| JPS6013002A (en) * | 1983-07-05 | 1985-01-23 | Mitsubishi Metal Corp | Continuous sintering furnace |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07118705A (en) * | 1993-10-19 | 1995-05-09 | Kanagawa Pref Gov | Method for controlling carbon content of metal powder compact |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0541711B1 (en) | Method for controlling the conversion of iron-containing reactor feed into iron carbide | |
| US20080073002A1 (en) | Carburization treatment method and carburization treatment apparatus | |
| JPS63190103A (en) | Method for controlling carbon potential in sintering furnace | |
| US4490108A (en) | Process for reducing the oxygen content of the atmosphere in a heat treatment furnace and heat treatment furnace for carrying out this process | |
| US7276204B2 (en) | Carburization treatment method and carburization treatment apparatus | |
| US2546013A (en) | Means and method for producing special heat-treating gaseous atmospheres | |
| CA1144742A (en) | Method of operating a continuous ceramic kiln | |
| ES8104974A1 (en) | Method for heat treatment of clay and refractory ware. | |
| GB1560175A (en) | Process for adjusting and regulating desired redox potentials in gases | |
| JPS60251265A (en) | Apparatus for controlling heat-treatment in atmosphere | |
| EP0024106B1 (en) | Method of heat treating ferrous workpieces | |
| JPS58217191A (en) | Method of reducing oxygen content of atmosphere of heating furnace and furnace executing said method | |
| JP3307697B2 (en) | Batch type firing furnace | |
| KR100871241B1 (en) | A carburization treatment method | |
| US1851831A (en) | Atmospheric control for heat treating furnaces | |
| JPH02130387A (en) | Industrial furnace | |
| CA1181586A (en) | Method and apparatus for controlling the atmosphere in a carburizing furnace utilizing a cascaded valving system | |
| JPS53132417A (en) | Control method for atmosphere inside heating furnace of nonoxidizing type | |
| JPS6233753A (en) | Control method for atmospheric gas | |
| JPS5713169A (en) | Method for controlling concentration of carbon in carburizing atmosphere | |
| TW268091B (en) | A roller furnace | |
| CN209537600U (en) | A kind of high carbon potential regulator control system for carburizer | |
| JPS61280311A (en) | Combustion type heating furnace | |
| CN106839757A (en) | A kind of controllable ceramic sintering kiln of firing atmosphere | |
| JPS6257592B2 (en) |