JP2946972B2 - Method for producing sealed Fe-based sintered alloy part with excellent airtightness - Google Patents
Method for producing sealed Fe-based sintered alloy part with excellent airtightnessInfo
- Publication number
- JP2946972B2 JP2946972B2 JP29203992A JP29203992A JP2946972B2 JP 2946972 B2 JP2946972 B2 JP 2946972B2 JP 29203992 A JP29203992 A JP 29203992A JP 29203992 A JP29203992 A JP 29203992A JP 2946972 B2 JP2946972 B2 JP 2946972B2
- Authority
- JP
- Japan
- Prior art keywords
- sintered alloy
- based sintered
- sealed
- alloy part
- excellent airtightness
- 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.)
- Expired - Fee Related
Links
Landscapes
- Powder Metallurgy (AREA)
Description
【0001】[0001]
【産業上の利用分野】この発明は、気密性のすぐれた封
孔Fe基焼結合金部品を製造する方法に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a sealed Fe-based sintered alloy part having excellent airtightness.
【0002】[0002]
【従来の技術】従来、一般に耐圧性が要求される油圧ポ
ンプやエアコン、さらにコンプレッサなどの構造部材と
して封孔Fe基焼結合金部品が用いられている。この封
孔Fe基焼結合金部品は、通常所定の配合組成を有する
混合粉末からプレス成形された圧粉体を、還元性雰囲気
中、1100〜1200℃の温度で焼結し、この結果得
られた気孔率:10〜30%を有するFe基焼結合金基
体に、連続炉またはバッチ炉を用い、温度:500〜6
50℃、圧力:5〜40mmAq、保持時間:1〜5時間
の条件で、過熱水蒸気を作用させて緻密なFe3 O4 の
酸化皮膜を生成させることからなる水蒸気による封孔処
理を施して、20kg/cm2以上の耐圧力を具備せしめる
ことにより製造されるものである。2. Description of the Related Art Conventionally, sealed Fe-based sintered alloy parts have been used as structural members such as hydraulic pumps, air conditioners, and compressors which generally require pressure resistance. This sealed Fe-based sintered alloy part is usually formed by sintering a green compact pressed from a mixed powder having a predetermined composition at a temperature of 1100 to 1200 ° C. in a reducing atmosphere. A continuous furnace or a batch furnace is used for a Fe-based sintered alloy substrate having a porosity of 10 to 30%, and a temperature of 500 to 6%.
Under a condition of 50 ° C., a pressure of 5 to 40 mmAq, and a holding time of 1 to 5 hours, a sealing treatment with steam comprising applying a superheated steam to form a dense oxide film of Fe 3 O 4 is performed. It is manufactured by providing a pressure resistance of 20 kg / cm 2 or more.
【0003】[0003]
【発明が解決しようとする課題】一方、近年、化石資源
の有限性、Fe基焼結合金基体の炭素濃度の制御、およ
び焼結炉設備の寿命などの点から、焼結雰囲気を、還元
性雰囲気(例えば変成ガス)にかえて窒素含有雰囲気と
する傾向にある。しかし、窒素含有雰囲気で焼結された
Fe基焼結合金に、上記水蒸気による封孔処理を施した
場合、十分な気密性が得られず、約5kg/cm2 以下程度
の耐圧力しか得られないのが現状である。On the other hand, in recent years, the sintering atmosphere has been reduced in terms of the finiteness of fossil resources, the control of the carbon concentration of the Fe-based sintered alloy substrate, and the life of the sintering furnace equipment. There is a tendency to use a nitrogen-containing atmosphere instead of an atmosphere (for example, a modified gas). However, when the Fe-based sintered alloy sintered in the nitrogen-containing atmosphere is subjected to the above-described sealing treatment with water vapor, sufficient airtightness cannot be obtained, and only a pressure resistance of about 5 kg / cm 2 or less can be obtained. There is no present.
【0004】[0004]
【課題を解決するための手段】そこで、本発明者等は、
上述のような観点から、窒素含有雰囲気で焼結したFe
基焼結合金基体の水蒸気による封孔処理に着目し研究を
行なった結果、水蒸気による封孔処理に先だって、焼結
雰囲気を窒素含有雰囲気としたFe基焼結合金基体に、
水素含有雰囲気、望ましくはH2 :10容量%以上を含
有する雰囲気中、400〜600℃の温度に加熱保持の
条件で改質処理を施すと、焼結時に合金表面部に吸着固
溶して、封孔処理の際の酸化反応の進行を阻害していた
窒素が前記改質処理の雰囲気中の水素との反応で除去さ
れ、この結果水蒸気による酸化反応の進行が著しく早め
られ、緻密な酸化皮膜が形成されることから、耐圧力で
20kg/cm2 以上の気密性のすぐれた封孔Fe基焼結合
金部品が得られるようになるという研究結果を得たので
ある。Means for Solving the Problems Accordingly, the present inventors have
In view of the above, Fe sintered in a nitrogen-containing atmosphere
As a result of conducting research focusing on the sealing treatment of the base sintered alloy substrate with steam, prior to the sealing treatment with steam, the Fe-based sintered alloy substrate with the sintering atmosphere containing nitrogen was used.
When a reforming treatment is performed under a condition of heating and holding at a temperature of 400 to 600 ° C. in a hydrogen-containing atmosphere, preferably an atmosphere containing H 2 : 10% by volume or more, the solid solution adsorbs and dissolves on the alloy surface during sintering. Nitrogen, which had hindered the progress of the oxidation reaction during the sealing treatment, was removed by the reaction with hydrogen in the atmosphere of the reforming treatment, and as a result, the progress of the oxidation reaction by steam was remarkably accelerated, and the dense oxidation was performed. The formation of the coating resulted in the research result that a sealed Fe-based sintered alloy part having good airtightness of 20 kg / cm 2 or more under pressure was obtained.
【0005】この発明は、上記の研究結果にもとづいて
なされたものであって、窒素含有雰囲気中で焼結された
気孔率:10〜30%を有するFe基焼結合金基体に、
水素含有雰囲気中、400〜600℃の温度に加熱保持
の条件で改質処理を施した後、水蒸気による封孔処理を
施すことにより気密性のすぐれた封孔Fe基焼結合金部
品を製造する方法に特徴を有するものである。The present invention has been made on the basis of the above-mentioned research results, and provides a Fe-based sintered alloy substrate having a porosity of 10 to 30% sintered in a nitrogen-containing atmosphere.
After performing a reforming treatment under a condition of heating and holding at a temperature of 400 to 600 ° C. in a hydrogen-containing atmosphere, a sealed Fe-based sintered alloy part having excellent airtightness is manufactured by performing a sealing treatment with steam. The method has features.
【0006】なお、この発明の方法において、Fe基焼
結合金基体の気孔率を10〜30%としたのは、その気
孔率を10%未満に緻密化するには、圧粉体成形時に大
型のプレス成形装置を必要とし、実用的でなく、一方そ
の気孔率が30%を越えると強度が急激に低下するよう
になるという理由にもとづくものである。[0006] In the method of the present invention, the porosity of the Fe-based sintered alloy substrate is set to 10 to 30%. The press forming apparatus is not practical and is based on the reason that when the porosity exceeds 30%, the strength rapidly decreases.
【0007】また、この発明の方法において、改質処理
温度を400〜600℃と定めたのは、その温度が40
0℃未満では、基体中の吸着固溶窒素と雰囲気中の水素
との結合反応が遅く、したがって脱窒素反応に長時間を
要するようになり、一方その温度が600℃を越えて
も、前記の脱窒素反応の進行が抑制されるようになると
いう理由によるものである。Further, in the method of the present invention, the reason why the reforming treatment temperature is set at 400 to 600 ° C. is that the temperature is 40 to 600 ° C.
If the temperature is lower than 0 ° C., the binding reaction between the adsorbed solid-dissolved nitrogen in the substrate and the hydrogen in the atmosphere is slow, so that a long time is required for the denitrification reaction. This is because the progress of the denitrification reaction is suppressed.
【0008】[0008]
【実施例】つぎに、この発明の方法を実施例により具体
的に説明する。原料粉末として、いずれも20〜200
μmの範囲内の所定の平均粒径を有する、Cu粉末、お
よび黒鉛粉末、さらに表1に示される成分組成をもった
Fe基合金粉末を用意し、これら原料粉末を表1に示さ
れる配合組成に配合し、混合した後、6〜7ton /cm2
の範囲内の圧力でプレス成形して圧粉体A〜Iを形成
し、これらの圧粉体A〜Iに、それぞれ、容量%で、
(a) N2 :42.2%,H2 :33.4%,CO:
24.0%,CH4 :0.4%、(b) N2 :25.
0%,H2 :75.0%、(c) N2 :98.0%,
H2 :2.0%、以上(a)〜(c)のいずれかの窒素
含有焼結雰囲気中、表2,3に示される温度に20分間
保持の条件で焼結して、同じく表2,3に示される気孔
率を有し、かついずれも直径:50mmφ×厚さ:5mmの
寸法をもったFe基焼結合金基体を形成し、引続いて焼
結後の冷却過程(この場合を連続処理という)または一
旦室温に冷却後(この場合を断続処理という)、(i)
N2 +H2 混合ガス(H2 :10容量%含有)、(i
i) アンモニア分解ガス+N2 ガス(H2 :30容量
%含有)、(iii) H2 ガス、以上(i)〜(ii
i)のいずれかの水素含有雰囲気中、表2,3に示され
る条件で前記Fe基焼結合金基体に改質処理を施し、つ
いで、連続炉を用い、温度:560℃、圧力:20mmA
q、保持時間:1.5時間の条件で水蒸気による封孔処
理を施すことからなる本発明方法1〜9を実施し、封孔
Fe基焼結合金部品をそれぞれ製造した。また、比較の
目的で、表2,3に示される通り、上記改質処理を行な
わない以外は同一の条件で比較方法1〜9を行ない、封
孔Fe基焼結合金部品を製造した。Next, the method of the present invention will be specifically described with reference to examples. As raw material powders, all 20 to 200
A Cu powder, a graphite powder, and an Fe-based alloy powder having a component composition shown in Table 1 having a predetermined average particle size in a range of μm are prepared. And after mixing, 6-7 ton / cm 2
The green compacts A to I are formed by press molding at a pressure within the range of:
(A) N 2 : 42.2%, H 2 : 33.4%, CO:
24.0%, CH 4: 0.4% , (b) N 2: 25.
0%, H 2: 75.0% , (c) N 2: 98.0%,
H 2 : 2.0%, sintered in the nitrogen-containing sintering atmosphere of any of the above (a) to (c) for 20 minutes at the temperature shown in Tables 2 and 3; , 3 are formed, each having a diameter of 50 mmφ × thickness: 5 mm, and a cooling process after sintering (in this case, (I.e., continuous treatment) or once cooled to room temperature (this case is referred to as intermittent treatment);
N 2 + H 2 mixed gas (H 2 : containing 10% by volume), (i
i) Ammonia decomposition gas + N 2 gas (H 2 : 30 volume% is contained), (iii) H 2 gas, (i) to (ii)
i) The Fe-based sintered alloy substrate is subjected to a reforming treatment in any one of the hydrogen-containing atmospheres under the conditions shown in Tables 2 and 3, and then in a continuous furnace at a temperature of 560 ° C. and a pressure of 20 mmA.
q, holding time: 1.5 hours, the present invention methods 1 to 9 comprising performing a sealing treatment with water vapor were performed to produce sealed Fe-based sintered alloy parts. Further, for the purpose of comparison, as shown in Tables 2 and 3, Comparative Methods 1 to 9 were performed under the same conditions except that the above-mentioned modification treatment was not performed, to produce a sealed Fe-based sintered alloy part.
【0009】[0009]
【表1】 [Table 1]
【0010】[0010]
【表2】 [Table 2]
【0011】[0011]
【表3】 [Table 3]
【0012】つぎに、この結果得られた各種の封孔Fe
基焼結合金部品(以下、単に部品という)について、図
1に概略縦断面図で示される通り、孔あき基板1の上
に、前記孔を中心にして上下面にOリングパッキングを
有する下部リング2を載置し、この下部リング2の上に
上記部品3を重ね、その上に下面に同じくOリングパッ
キングを有し、かつ側面に貫通孔4を有する蓋付上部リ
ング5を載置し、さらに前記部品3の外周側面を覆うよ
うにカバーリング6を嵌着して、これを前記下部および
上部リング2,5にボルト(図示せず)で取付け、前記
貫通孔4には他方端を流量計7に取付けたパイプ8の一
方端を取付け、上記上部リング5に押えバンチ9で50
kg/cm2 の圧力を付加した状態で、基板1の孔から上記
部品3の下面に加圧窒素ガスを導入し、上記部品3の上
面からリークした窒素ガスの流量が前記流量計7で検知
して、3cc/min.となった時点の前記加圧窒素ガスの圧
力を測定し、耐圧力とした。この結果を表2,3に示し
た。[0012] Next, various sealing Fe obtained as a result is obtained.
As shown in a schematic longitudinal sectional view in FIG. 1, a lower ring having an O-ring packing on an upper surface and a lower surface around a hole, as shown in a schematic longitudinal sectional view in FIG. 2, the component 3 is placed on the lower ring 2, and an upper ring 5 with a lid having the same O-ring packing on the lower surface and a through hole 4 on the side surface is placed thereon. Further, a cover ring 6 is fitted so as to cover the outer peripheral side surface of the component 3 and attached to the lower and upper rings 2 and 5 with bolts (not shown). Attach one end of the pipe 8 attached to the total 7, and press the bunch 9 to the upper ring 5.
Under a pressure of kg / cm 2 , pressurized nitrogen gas is introduced from the hole of the substrate 1 to the lower surface of the component 3, and the flow rate of the nitrogen gas leaked from the upper surface of the component 3 is detected by the flow meter 7. Then, the pressure of the pressurized nitrogen gas at the time when the pressure became 3 cc / min. Was measured and defined as the withstand pressure. The results are shown in Tables 2 and 3.
【0013】表2,3に示される通り、本発明方法1〜
9によって製造された封孔Fe基焼結合金部品は、いず
れも改質処理を行なわない比較方法1〜9で製造された
封孔Fe基焼結合金部品に比して、一段と高い耐圧力を
示すことが明らかである。上述のように、この発明の方
法によれば窒素含有雰囲気を適用して焼結されたFe基
焼結合金であっても、水蒸気による封孔処理前に、これ
に改質処理を施すことにより気密性のすぐれた封孔Fe
基焼結合金部品を製造することができるのである。As shown in Tables 2 and 3, the present invention methods 1 to 1
The sealed Fe-based sintered alloy parts manufactured by the method No. 9 have higher pressure resistance than the sealed Fe-based sintered alloy parts manufactured by the comparative methods 1 to 9 in which none of the modification processes are performed. It is clear to show. As described above, according to the method of the present invention, even a Fe-based sintered alloy sintered by applying a nitrogen-containing atmosphere is subjected to a reforming treatment before the sealing treatment with steam. Sealed Fe with excellent airtightness
Base sintered alloy parts can be manufactured.
【図1】封孔Fe基焼結合金部品の耐圧力の測定態様を
示す概略縦断面図である。FIG. 1 is a schematic longitudinal sectional view showing a measurement mode of a pressure resistance of a sealed Fe-based sintered alloy part.
1 基板 2 下部リング 3 封孔Fe基焼結合金部品 4 貫通孔 5 上部リング 6 カバーリング 7 流量計 8 パイプ 9 押えパンチ DESCRIPTION OF SYMBOLS 1 Substrate 2 Lower ring 3 Sealing Fe-based sintered alloy part 4 Through hole 5 Upper ring 6 Cover ring 7 Flow meter 8 Pipe 9 Holding punch
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6,DB名) B22F 3/24 C21D 1/76 C21D 3/08 C22C 33/02 101 C23C 8/18 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 6 , DB name) B22F 3/24 C21D 1/76 C21D 3/08 C22C 33/02 101 C23C 8/18
Claims (1)
10〜30%を有するFe基焼結合金基体に、水蒸気に
よる封孔処理を施すに先だって、 水素含有雰囲気中、400〜600℃の温度に加熱保持
の条件で改質処理を施すことを特徴とする気密性のすぐ
れた封孔Fe基焼結合金部品の製造方法。1. Porosity sintered in a nitrogen-containing atmosphere:
Prior to subjecting the Fe-based sintered alloy substrate having 10 to 30% to the sealing treatment with steam, the reforming treatment is performed in a hydrogen-containing atmosphere at a temperature of 400 to 600 ° C. under heating and holding conditions. Of producing a sealed Fe-based sintered alloy part having excellent airtightness.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP29203992A JP2946972B2 (en) | 1992-10-06 | 1992-10-06 | Method for producing sealed Fe-based sintered alloy part with excellent airtightness |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP29203992A JP2946972B2 (en) | 1992-10-06 | 1992-10-06 | Method for producing sealed Fe-based sintered alloy part with excellent airtightness |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH06116607A JPH06116607A (en) | 1994-04-26 |
JP2946972B2 true JP2946972B2 (en) | 1999-09-13 |
Family
ID=17776745
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP29203992A Expired - Fee Related JP2946972B2 (en) | 1992-10-06 | 1992-10-06 | Method for producing sealed Fe-based sintered alloy part with excellent airtightness |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2946972B2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4528542B2 (en) * | 2004-03-10 | 2010-08-18 | 住友電工焼結合金株式会社 | Compressor bearing |
JP4832790B2 (en) * | 2005-04-19 | 2011-12-07 | Dowaサーモテック株式会社 | Steel member surface treatment method and steel member |
-
1992
- 1992-10-06 JP JP29203992A patent/JP2946972B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH06116607A (en) | 1994-04-26 |
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