JPS6059043A - Manufacture of sintered alloy material for seal ring - Google Patents
Manufacture of sintered alloy material for seal ringInfo
- Publication number
- JPS6059043A JPS6059043A JP16674883A JP16674883A JPS6059043A JP S6059043 A JPS6059043 A JP S6059043A JP 16674883 A JP16674883 A JP 16674883A JP 16674883 A JP16674883 A JP 16674883A JP S6059043 A JPS6059043 A JP S6059043A
- Authority
- JP
- Japan
- Prior art keywords
- seal ring
- strength
- alloy material
- resistance
- aging
- 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.)
- Granted
Links
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- Powder Metallurgy (AREA)
Abstract
Description
【発明の詳細な説明】
技術分野
本発明は耐熱性および耐摩耗性に優れ、かつ高強度を有
する焼結合金製クールリング材の製造方法に関するもの
であシ、さらに詳しく述べるならばターボチャージャー
のタービン側において排気ガス及び潤滑油をシールする
ためにシャフトに装着されるシールリング等に用いられ
るソールリング材の製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a method for manufacturing a sintered metal cool ring material that has excellent heat resistance, wear resistance, and high strength. The present invention relates to a method for manufacturing a sole ring material used for a seal ring attached to a shaft to seal exhaust gas and lubricating oil on the turbine side.
従来技術
一般にターボチャージャーのタービン側ソールリング（
以下、単にクールリングと称する）は４００℃以上の高
温排気ガスにさらされるので耐熱性が優れてお多かつ高
温下で排気ガスおよび潤滑油のシール性を保たねばなら
ない。而して、シールリングはターボチャージャーのシ
ャフトのタービン側に形成されたリング溝に嵌め込まれ
ておシ、またシールリングの内径はリング溝部のシャフ
ト外径よシ僅かに小さく定められているために。Conventional technology Generally speaking, the sole ring on the turbine side of a turbocharger (
Cool rings (hereinafter simply referred to as cool rings) are exposed to high-temperature exhaust gas of 400° C. or higher, so they must have excellent heat resistance and maintain sealing properties against exhaust gas and lubricating oil at high temperatures. The seal ring is fitted into a ring groove formed on the turbine side of the turbocharger shaft, and the inner diameter of the seal ring is set to be slightly smaller than the outer diameter of the shaft in the ring groove. .
シールリングは張力を受けた状態で高温排気ガスにさら
される。よってソールリングが使用中に張力？保持して
いることがシールリングとしての重要な特性の１つであ
る。The seal ring is exposed to hot exhaust gas under tension. So the sole ring is under tension during use? One of the important characteristics of a seal ring is that it retains its properties.
また、ターボチャージャーのタービンの回転数は最大十
数万ｒｐｍ の高速回転となるので、７−ルリング材に
は耐摩耗性（相手材１４粍させない性質も含む〕および
耐焼付性についても高い性能があわせて要求される。さ
らに、ソールリングはシャフトより小径であるためシャ
フトへ装着する時リングを胛前げる必要があシ、この際
過大な応力がシールリングに作用し、シールリングが塑
性変形する場合がある。この塑性変形によりターボチャ
ージャー運転初期の異常摩耗、焼付等のトラブルが発生
する場合も認められる。よってシールリング材としては
弾碓変形限界応力が高い高強度であり、装着時に塑性変
形し７ない月別が望ましい。In addition, since the turbine of a turbocharger rotates at a high speed of up to several hundred thousand rpm, the 7-ring material has high performance in terms of wear resistance (including the property of not damaging the mating material) and seizure resistance. Furthermore, since the sole ring has a smaller diameter than the shaft, it is necessary to move the ring forward when attaching it to the shaft, and in this case, excessive stress is applied to the seal ring, causing it to become plastically deformed. This plastic deformation may cause problems such as abnormal wear and seizure during the early stages of turbocharger operation.Therefore, as a seal ring material, it is a high-strength material with a high elastic deformation limit stress, and plastic deformation occurs during installation. It is preferable to have monthly data that does not change.
現在シールリングには高速度鋼、オーステナイト鋳鋼、
高Ｃ「鋳鋼、ステンレス鋼等の溶製材料が用いられてい
る。これらの溶製材料は耐熱性に優れているが、小径ソ
ールリングを製作するためには多大の加工々数を必要と
し％また材料歩留も極めて悪くなるという欠点を有する
。更にこれらの溶製材料は耐・焼付性、耐摩耗性、ある
いは装着時の塑性変形等の問題を有している。Currently, seal rings are made of high-speed steel, austenitic cast steel,
High C: Molten materials such as cast steel and stainless steel are used. Although these materials have excellent heat resistance, they require a large number of machining processes to manufacture small diameter sole rings. In addition, they have the disadvantage that the material yield is extremely poor.Furthermore, these melt-produced materials have problems such as resistance to seizure, wear resistance, and plastic deformation during installation.
発明の目的
本発明は、材料組成の自由度が窩く、内在空孔により耐
熱性、耐摩耗性等の改善を容易に実施可能とし、さらに
熱処理により篩強度を得ることも可能でちるというｄ３
’Ｊ結材刺の特徴を利用して、溶製材料の欠点を解消し
たシールリング材を製造する方法を提供することを目的
とする。Purpose of the Invention The present invention has a wide degree of freedom in material composition, makes it possible to easily improve heat resistance, abrasion resistance, etc. due to internal pores, and also makes it possible to obtain sieve strength through heat treatment.
The object of the present invention is to provide a method for manufacturing a seal ring material that eliminates the drawbacks of ingot materials by utilizing the characteristics of J-binding barbs.
発明の構成
本発明は重量比でＣｒ ７〜１５％、Ｎｉ２〜８％、
Ｃｏ １ ｏ−ｉ ５％、 Ｍｏ ２〜８９に 、 Ｃ
ｕ １〜７％、残部実質的にＦｅから成る混合粉末又は
合金粉末を圧粉成形し、焼結後４００℃〜６００℃う。Structure of the invention The present invention contains 7 to 15% Cr, 2 to 8% Ni,
Co 1 o-i 5%, Mo 2~89, C
A mixed powder or alloy powder consisting of u 1 to 7% and the remainder substantially Fe is compacted and heated at 400 to 600C after sintering.
ＣｒおよびＮｉ は焼結合金のマトリックスを焼結後の
冷却過程で、マルテンサイト化するために必要な元素で
あり、Ｃｒ およびＮｉ が俗々下限（Ｃｒ７蟹、Ｎｉ
２％〕を下まわると、焼結後の冷却においてマルテンサ
イトマトリックスにはならず、また上限（Ｃｒ １５
％ 、 Ｎｔ ８ ％ ） ｆ超えるとオーステナイト
マトリックスが増大するので好ましくない。よってＣｒ
７〜１５％、Ｎ４２〜８％とする。更にＣｒは高置で
の耐食性を向上きせる効果もある。Cr and Ni are elements necessary to turn the matrix of the sintered alloy into martensite in the cooling process after sintering, and Cr and Ni are generally at the lower limit (Cr7 crab, Ni
2%], it will not become a martensitic matrix during cooling after sintering, and the upper limit (Cr 15
%, Nt8%) f is not preferable because the austenite matrix increases. Therefore, Cr
7 to 15%, N42 to 8%. Furthermore, Cr also has the effect of improving corrosion resistance at elevated locations.
Ｃｏ、 Ｍｏ、及びＣｕは後述する時効処理によシ金属
間仕合物となって析出し１強度を大巾に向上させると共
に材料の耐熱性を高める元素である。Co, Mo, and Cu are elements that precipitate as intermetallic compounds through aging treatment, which will be described later, and greatly improve the strength and heat resistance of the material.
なお、金属間（ヒ合物に関しては、Ｆｅ −Ｍｏ ２元
系ではＦｅ２Ｍｏが生成し、Ｆｅ −Ｃｏ−Ｃｏ ３元
系ではＣｏ添加によ、リスピノ−ダル分解が起ってＦｅ
Ｃｕが生成するなどの発表が学術文献にてなされている
が、本発明の合金系で生成する金属間化合物の種類は不
明である。ＣＯ１０％未満、Ｍ。Regarding intermetallic (arsenic compounds), Fe2Mo is generated in the Fe-Mo binary system, and Rispinodal decomposition occurs due to the addition of Co in the Fe-Co-Co ternary system, resulting in the formation of Fe.
Although it has been announced in academic literature that Cu is generated, the type of intermetallic compound that is generated in the alloy system of the present invention is unknown. Less than 10% CO, M.
２（Ｘ未満、Ｃｕ１！％未満ではその効果が乏しく。If the content is less than 2 (X or Cu1!%), the effect is poor.
Ｃｏ １５％、Ｍｏ ８％、Ｃｕ７％を超えてもその効
果が飽和し、合金元素使用量が過大になりコスト高とな
るので、 Ｃｏ １０〜１５π、Δ４０２〜８π、Ｃｕ
１〜７％とする。Even if it exceeds 15% Co, 8% Mo, and 7% Cu, the effect will be saturated, and the amount of alloying elements used will become excessive, resulting in high costs.
1 to 7%.
なお、本発明の焼結合金は、上述の組成の溶製合金を粉
砕した粉末、又はＦｅ−Ｍｏ 、Ｆｅ −Ｃｏ 、純鉄
などの母合金を粉砕混合するかあるいは各単体粉末を混
合して上述の組成とした粉末を原料として、詳しくは後
述の方法で調製される。The sintered alloy of the present invention can be obtained by pulverizing a powder obtained by pulverizing an ingot alloy having the above-mentioned composition, by pulverizing and mixing a mother alloy such as Fe-Mo, Fe-Co, or pure iron, or by mixing each individual powder. It is prepared in detail by the method described below using the powder having the above-mentioned composition as a raw material.
本発明の響結合金は、Ｃ，Ｓ量、 Ｐ、 ８．などの不
純物あるいは合金元素の効果を妨げない若干量のＴｉ、
Ａｔなどの添加元素を含有してもよい。The acoustic metal of the present invention has a C, S content, P, 8. A small amount of Ti that does not interfere with the effects of impurities or alloying elements such as
It may contain additional elements such as At.
また本発明のシールリング材けＪ暁枯しただけではある
いは焼結後適宜の溶体化処理をしただけでは強度も硬さ
もさほど向上しないが、時効処理？施すことによｐ本発
明の組成限定と相俟って大巾な強度増加と硬さ増加が起
こりひいては耐熱性、耐摩耗性、および装着時の塑性変
形に対する抵抗性が向上する。時効温度４００℃未満で
は時効の効果が不十分であること、６００℃？超えると
過時効となり強度、硬式が低下するので、時効温度とし
ては４００℃〜６００℃を設定するが、より好ましくは
４５０〜５５０℃である。なお時効時間として１１ま０
．５〜５Ｈｒ を時効温度との関係で選択すればよい。Also, the strength and hardness of the seal ring material of the present invention will not improve significantly if it is simply aged or if it is subjected to an appropriate solution treatment after sintering, but aging treatment? Coupled with the compositional limitations of the present invention, this application results in a significant increase in strength and hardness, which in turn improves heat resistance, abrasion resistance, and resistance to plastic deformation during installation. The effect of aging is insufficient if the aging temperature is less than 400℃, or 600℃? If the temperature exceeds 400°C to 600°C, the aging temperature is set at 400°C to 600°C, and more preferably 450°C to 550°C. The statute of limitations is 11 o'clock.
．． 5 to 5 hours may be selected depending on the aging temperature.
通常時効処理は一段時効で行われるが、二段時効で行っ
てもよく、あるいは６００℃から４００℃の湛度範囲ヲ
０．５時間」ン上かけて徐冷する冷却時効により行って
もよい。Aging treatment is usually carried out by one-stage aging, but it may be carried out by two-stage aging, or it may be carried out by cooling aging in which slow cooling is performed over a temperature range of 600°C to 400°C for 0.5 hours. .
なお本発明における成形および焼結Φ件としては混合あ
るいは合金粉末を５〜１０ ／２で圧粉成形した後１２
００〜１３００℃に真空、水素あるいは分解アンモニア
ガス雰囲気中で４０〜９０分間加熱する条件を採用する
ことが望ましい。この条件によると穿孔率は一般に１０
に〜２０％である。In addition, the molding and sintering conditions in the present invention are as follows: After compacting the mixed or alloy powder at a ratio of 5 to 10/2,
It is desirable to adopt conditions of heating to 00 to 1300°C for 40 to 90 minutes in a vacuum, hydrogen or decomposed ammonia gas atmosphere. According to this condition, the perforation rate is generally 10
~20%.
実施例１
第１表に示した各イヒ学組成になるように各種粉末を秤
量し、■型ばキサ−で３０分間混合し、成形圧力７ト７
／２でリング状に圧粉成形し、最後に分解アンモニアガ
ス雰囲気中において１３００℃でＩＨｒ焼結した。使用
した各粉末は電解コバルト粉（−３２５メツシュ〕、カ
ーボニルＮｉ粉（１０μ！ｎ）、全縮モリブデン粉（１
，５μア〕。Example 1 Various powders were weighed so as to have the chemical compositions shown in Table 1, mixed for 30 minutes in a mold mixer, and molded at a pressure of 7 to 7.
The material was compacted into a ring shape at a temperature of 1/2, and finally IHr sintered at 1300° C. in a decomposed ammonia gas atmosphere. The powders used were electrolytic cobalt powder (-325 mesh), carbonyl Ni powder (10 μ!n), and fully reduced molybdenum powder (1
, 5 μa].
電解Ｃｕ粉（−２５０メツシー〕、クロムについては一
１００メツシーのＳＵＳ ４１０Ｌ、 ５ＬＩＳ ４３
０Ｌ粉および一１００メッンーの純Ｆｅ粉を用いて調製
した。但し第１表中本発明利りは第１表の成分の合金粉
末（−ｉｏｏメツシー〕を使用した。時効処Ｂａｄ各試
刺とともに５００℃で１ Ｈｒ ａ Ａ ｒガス雰囲気
中で加熱した。時効後１機械加工により。Electrolytic Cu powder (-250 meters), chromium -1100 meters SUS 410L, 5LIS 43
It was prepared using 0L powder and 1100mm pure Fe powder. However, for the present invention in Table 1, an alloy powder (-ioo mesh) with the ingredients shown in Table 1 was used.Aging treatment Bad test pieces were heated at 500°C for 1 hour in an Ar gas atmosphere.Aging After 1 machining.
呼び径２０ＷＩＩ１１１幅１．６ｆｉ、厚さ１．１唄の
クールリングを作製し、張力減退のテスト′ヲ行なった
。張力減退のテストハシールリング呼び径と同一寸法の
鋳鉄製シリンダーにシールリング？装着し、３５０℃、
４００℃、４５０℃で各々１０ＨｒＡｒガス中で加熱す
ることによって実施した。加熱前後の自由合い口すき間
の変什量をめ張力減退率とした。A cool ring with a nominal diameter of 20 WII111, a width of 1.6 fi, and a thickness of 1.1 ut was prepared and a tension reduction test was conducted. Tension reduction test Is the seal ring attached to a cast iron cylinder with the same dimensions as the nominal diameter of the seal ring? Installed, heated to 350℃,
This was carried out by heating at 400° C. and 450° C. for 10 hours each in Ar gas. The change in the free joint gap before and after heating was taken as the tension reduction rate.
焼結時効後の各特性値および張力減退率も合わせて第１
表に示した。Each characteristic value and tension reduction rate after sintering aging are also
Shown in the table.
り下余白
第１表の結果から本発明材は高強ぼｒを有しかつ優れた
耐熱性を有することが明らかになった。なお比較材Ｊ及
びＫは張力減退率が４５０℃にてがなり良好な値を示す
が、それぞれＣＯ及びＨＯＯ量が多く、Ｃｏ、Ｍｏ添加
コストに対する性能比が低い。From the results shown in Table 1 below, it is clear that the material of the present invention has high tenacity and excellent heat resistance. Comparative materials J and K exhibit a good tensile strength reduction rate at 450° C., but each has a large amount of CO and HOO, and the performance ratio relative to the cost of adding Co and Mo is low.
実施例２
実施例１で作製した外径２０間１幅１．６ ｒａｎ 、
厚さ１．１咽のソールリングを自由合い口を拡幅してφ
１９５咽のマンドレルに装着し、そしてマンドレルを１
回通し、その前後の自由合い口すき間の変ずヒを調べた
。その結果を第２表に示した。Example 2 The outer diameter 20 and the width 1.6 ran produced in Example 1,
The sole ring has a thickness of 1.1 mm and the free joint is widened to φ
Attach it to the 195mm mandrel, and then attach the mandrel to 1
I passed it through and checked the gaps between the front and back openings. The results are shown in Table 2.
以下余白
第２表
第２表の結果から本発明材は装着時の１塑性変形が極め
て少ないことが明らかになった。From the results shown in Table 2 (Table 2) below, it is clear that the material of the present invention exhibits extremely little plastic deformation during installation.
実施例３
第１図に実姉例１の第１表１ｃかした本発明材Δ材につ
いて時効温度と引張強さとの関係を示した。Example 3 FIG. 1 shows the relationship between the aging temperature and the tensile strength of the Δ material of the present invention shown in Table 1c of Example 1.
時効温度４００℃〜６００℃において、引張強で１１４
”／２ 以上の値が得られ、時効温度４００℃〜６００
℃が適切であることが明らかである。At an aging temperature of 400℃ to 600℃, the tensile strength is 114
”/2 or more was obtained, and the aging temperature was 400°C to 600°C.
It is clear that ℃ is suitable.
実施例４
実施例１の第１表に示した本発明材Ａについて実機試験
を行なった。供試したターボチャージャーＵタービン翼
径φ５６−、コンプレッｖ−ＩＡ径φ５４プであり、シ
ールリング（１木）は呼び径φＩＺ５祁０幅１．．６
ｖｍ 、厚さ０．９■に機械加工し。Example 4 Inventive material A shown in Table 1 of Example 1 was tested on an actual machine. The turbocharger U turbine blade diameter used was φ56, the compressor V-IA diameter was φ54, and the seal ring (1 wood) had a nominal diameter of φIZ5 and a width of 1. ．． 6
Machined to vm, thickness 0.9■.
相手材２ＳＵＭ４３とし実根テストに供した。なお比較
例として現在シールリングとして使用されているオース
テナイト鋳鋼（２０％Ｃｒ −２０％Ｎｉ −１０％
Ｃｏ−５９にＷ−２％Ｍｏ −１，４イＳｉ −１，６
％Ｃ残部Ｆｅ）も実機試験に供した。The mating material 2SUM43 was used for a real root test. As a comparative example, austenitic cast steel (20% Cr - 20% Ni - 10%
Co-59 with W-2% Mo -1,4 and Si -1,6
%C balance Fe) was also subjected to actual machine testing.
テスト条件はターボチャージャーを４気筒２．３ｔのデ
ィーゼルエンジンに装着し、４２００＃ｍ全負荷で２０
０Ｈｒの耐久運転を行なった。この試験前後の自由合い
ローｆき間の変什率ｒ張力減退塞とし、またシールリン
グの１屡方向の摩耗量は両面の各々の摩耗量の和として
められた。その結果？第３表に示した。The test conditions were a 4-cylinder 2.3t diesel engine equipped with a turbocharger, and a 4200#m full load of 20
Endurance operation was performed for 0 hours. The rate of change between the free and low clearance f before and after this test was defined as r, the decrease in tension, and the amount of wear in one direction of the seal ring was calculated as the sum of the amount of wear on both sides. the result? It is shown in Table 3.
第３表
発明の効果
本発明法によシ與造されたソールリングｔよ優れた耐熱
性および耐摩耗性を有し、かつ高強兜紮有し、シールリ
ング装着時の塑性変形が極めて少ない優れた特性を有す
る。Table 3 Effects of the Invention The sole ring t manufactured by the method of the present invention has excellent heat resistance and abrasion resistance, has high strength, and has very little plastic deformation when the seal ring is installed. It has the following characteristics.
第１図は実施例３に示した本発明材Ａの時効温度と引張
強さとの関係を示すグラフである。
第１ｍ１
手続補正書
昭和５９年７り／ユ日
特許庁長官 志 賀 学 殿
１、事件の表示
昭和５８年 特許願 第１Ｆｉｆｉ７４８号２、発明の
名称
焼結合金製シールリング杓の製造方法
３、補正をする者
事件との関係 特許出願人
４、代理人
（外 ４ 名）
６、補正の内容
（１）発明の詳細な説明FIG. 1 is a graph showing the relationship between aging temperature and tensile strength of the invention material A shown in Example 3. No. 1m1 Procedural Amendment July 1980/Mr. Manabu Shiga, Director General of the Japanese Patent Office1, Indication of the Case 1981 Patent Application No. 1 Fifi 7482, Name of the Invention Method for Manufacturing a Seal Ring Ladle Made of Sintered Alloy 3, Relationship with the case of the person making the amendment Patent applicant 4, agent (4 others) 6. Contents of the amendment (1) Detailed explanation of the invention
Claims (1)
。 Ｃｏ ’ｌ Ｉ：ｌ〜１５％ 、 Ｍｏ ２〜８％ 、
Ｃｕ １〜７％。 残部実質的にＦｅから成る混合粉末または合金粉末全圧
粉成形し、焼結後４００ｔｌ：〜６ＧＯ℃で時効処理を
施すことを特徴とする焼結合金製シールリング材の製造
方法。[Claims] 1. Cr 7-15% by weight, Ni 2-89f;
. Co'I: 1~15%, Mo 2~8%,
Cu 1-7%. A method for manufacturing a seal ring material made of a sintered alloy, characterized in that a mixed powder or an alloy powder, the remainder of which is substantially Fe, is completely compacted, and after sintering, an aging treatment is performed at 400 tl: ~6 GO°C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16674883A JPS6059043A (en) | 1983-09-12 | 1983-09-12 | Manufacture of sintered alloy material for seal ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16674883A JPS6059043A (en) | 1983-09-12 | 1983-09-12 | Manufacture of sintered alloy material for seal ring |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6059043A true JPS6059043A (en) | 1985-04-05 |
| JPH0116293B2 JPH0116293B2 (en) | 1989-03-23 |
Family
ID=15837012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16674883A Granted JPS6059043A (en) | 1983-09-12 | 1983-09-12 | Manufacture of sintered alloy material for seal ring |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6059043A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7985304B2 (en) | 2007-04-19 | 2011-07-26 | Ati Properties, Inc. | Nickel-base alloys and articles made therefrom |
| JP2014194262A (en) * | 2013-03-29 | 2014-10-09 | Riken Corp | Rotating shaft seal ring made of iron-based sintered alloy and manufacturing method of the same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4931508A (en) * | 1972-07-21 | 1974-03-22 | ||
| JPS5140324A (en) * | 1974-10-02 | 1976-04-05 | Sumitomo Electric Industries | Koshitsutokeikeesu oyobi sonoseizoho |
| JPS589830A (en) * | 1981-07-08 | 1983-01-20 | Tanaka Kikinzoku Kogyo Kk | Stirrer for glass smelting and its preparation |
-
1983
- 1983-09-12 JP JP16674883A patent/JPS6059043A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4931508A (en) * | 1972-07-21 | 1974-03-22 | ||
| JPS5140324A (en) * | 1974-10-02 | 1976-04-05 | Sumitomo Electric Industries | Koshitsutokeikeesu oyobi sonoseizoho |
| JPS589830A (en) * | 1981-07-08 | 1983-01-20 | Tanaka Kikinzoku Kogyo Kk | Stirrer for glass smelting and its preparation |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7985304B2 (en) | 2007-04-19 | 2011-07-26 | Ati Properties, Inc. | Nickel-base alloys and articles made therefrom |
| JP2014194262A (en) * | 2013-03-29 | 2014-10-09 | Riken Corp | Rotating shaft seal ring made of iron-based sintered alloy and manufacturing method of the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0116293B2 (en) | 1989-03-23 |
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