JPS6071581A - Heat resistant and sliding damage resistant inorganic structural material - Google Patents

Heat resistant and sliding damage resistant inorganic structural material

Info

Publication number
JPS6071581A
JPS6071581A JP58179188A JP17918883A JPS6071581A JP S6071581 A JPS6071581 A JP S6071581A JP 58179188 A JP58179188 A JP 58179188A JP 17918883 A JP17918883 A JP 17918883A JP S6071581 A JPS6071581 A JP S6071581A
Authority
JP
Japan
Prior art keywords
sliding
resistant
materials
damage
heat
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
Application number
JP58179188A
Other languages
Japanese (ja)
Other versions
JPH059394B2 (en
Inventor
裕子 津谷
長谷川 安利
卓 村上
島内 智毅
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Komatsu Ltd
National Institute for Research in Inorganic Material
National Institute of Advanced Industrial Science and Technology AIST
Original Assignee
Agency of Industrial Science and Technology
Komatsu Ltd
National Institute for Research in Inorganic Material
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Agency of Industrial Science and Technology, Komatsu Ltd, National Institute for Research in Inorganic Material filed Critical Agency of Industrial Science and Technology
Priority to JP58179188A priority Critical patent/JPS6071581A/en
Publication of JPS6071581A publication Critical patent/JPS6071581A/en
Publication of JPH059394B2 publication Critical patent/JPH059394B2/ja
Granted legal-status Critical Current

Links

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。
(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【発明の詳細な説明】 本発明は諸種の環境における滑りを伴う機械部品材料並
びに構造材料、例えば内燃機関用シリンダ、カム、ピス
トンリング、ベアリング、ロータリパルプ、ポンプのベ
ーン、サイドシール、歯車並びに切削工具、塑性加工工
具等に使用される摺動損傷に強い耐熱耐摺動損傷無機系
構造材料に関するものである。
DETAILED DESCRIPTION OF THE INVENTION The present invention is applicable to mechanical parts and structural materials that are subject to slippage in various environments, such as internal combustion engine cylinders, cams, piston rings, bearings, rotary pulp, pump vanes, side seals, gears, and cutting materials. This invention relates to heat-resistant and sliding damage-resistant inorganic structural materials used in tools, plastic working tools, etc.

従来、このような高温のもとで使用される材料として高
温高強度のS1$ 7V4 、5 t C、ZrO2等
のセラミックスが検討されているが脆性破壊を起しやす
いため強度のバラツキが大きく、また摺動部に使用され
た場合必ずしも良好でない。
Conventionally, high-temperature, high-strength ceramics such as S1$7V4, 5tC, and ZrO2 have been considered as materials to be used under such high temperatures, but they tend to cause brittle fracture, resulting in large variations in strength. Moreover, it is not necessarily good when used in sliding parts.

これはかかるセラミックスの脆性破壊の特性として、金
属等の延性による破壊とは異なり、数ミクロン程度の比
較的小さな限界長さを越えたクラックが存在すると極め
て容易にクラックが進展するので著しい強度低下がもた
らされるからである。そして1部品としての動作並びに
組立過程の表面摺動により、これらの材料中には微細な
りラックを生じ易い。これを防ぐには大別して次の2種
類の方法が考えられている。
This is because, as a characteristic of brittle fracture in ceramics, unlike the ductile fracture of metals, if a crack exists that exceeds a relatively small critical length of several microns, the crack will propagate very easily, resulting in a significant decrease in strength. Because it will come. Due to movement as a single component and surface sliding during the assembly process, fine racks are likely to occur in these materials. To prevent this, the following two types of methods have been considered.

即ち(1)材料を高靭性化することにより亀裂の発生を
防止する。(2)潤滑作用を付加して摩擦係数を減少さ
せることにより、摺動時に発生する応力を低減する。
That is, (1) the occurrence of cracks is prevented by increasing the toughness of the material; (2) Stress generated during sliding is reduced by adding lubrication to reduce the coefficient of friction.

このうち前記(1)の方法は各種の研究が行われている
が摺動条件によっては必ずしも満足する結果は得られて
いない。本発明は前記(2)の方法について鋭意研究し
てなされたものであり、その目的とするところは潤滑、
油が無効となる高温のもとで摺動特性を良好にすること
により強度と耐久性がある耐熱耐摺動損傷無機系<14
造材料を提供することにある。
Among these methods, various studies have been conducted on method (1), but satisfactory results have not always been obtained depending on the sliding conditions. The present invention was made through intensive research into the method (2) above, and its purpose is to provide lubrication,
Heat-resistant, sliding damage-resistant, inorganic type <14 that has strength and durability by improving sliding properties at high temperatures where oil becomes ineffective.
The goal is to provide building materials.

以下、本発明を説明する。The present invention will be explained below.

Cr、03. Tie!、 NbO2、ZrO2、Ta
C、VC,MoSi 。
Cr, 03. Tie! , NbO2, ZrO2, Ta
C, VC, MoSi.

No C、IP’c等のセラミックス材(以下、これら
の材料を高温自己潤滑セラミックス材料と言う)はそれ
ぞれに適した環境物質中では、高温時に摩擦係数が低下
するし、摺動損傷を生ぜず、耐摩耗性もすぐれている特
性を発明者は見い出した。しかしながらこれらの高温自
己潤滑セラミックス材料の多べは単体では十分な強度を
得られない。
Ceramic materials such as No C and IP'c (hereinafter referred to as high-temperature self-lubricating ceramic materials) have a coefficient of friction that decreases at high temperatures and do not cause sliding damage in environmental substances suitable for each material. The inventor has discovered that the material also has excellent wear resistance. However, many of these high-temperature self-lubricating ceramic materials cannot provide sufficient strength when used alone.

そこで、高温で強度を有する耐熱構造用セラミックス材
料として一般的に使用されかつそれぞれの高温自己潤滑
セラミックス材料と密着性の良い選択された材料として
の金属窒化物(szJa 。
Therefore, metal nitride (szJa) is selected as a material that is generally used as a ceramic material for heat-resistant structures that has strength at high temperatures and has good adhesion to each high-temperature self-lubricating ceramic material.

AIN 、 TiN 、 BN )若しくは金属炭化物
(F(、’。
AIN, TiN, BN) or metal carbide (F(,'.

SiC)、金fl酸化物(Δ1203. Zr02)な
どのセラミックス材料又は前記金属窒化物若しくは金属
炭化物、金属酸化物等を主成分とするサーメツト材等を
素地となる材料を窓材料とし、この窓材料の表面を高温
自己潤滑性セラミックス材料で被覆することにより、潤
滑油が無効となる高温のもとで摺動特性が良好で1強度
と耐久性のある構造材料を作成した。
The window material is a ceramic material such as SiC), gold fl oxide (Δ1203.Zr02), or a cermet material whose main component is the metal nitride, metal carbide, metal oxide, etc., and this window material By coating the surface of the material with a high-temperature self-lubricating ceramic material, we created a structural material that has good sliding properties, strength, and durability at high temperatures where lubricating oil becomes ineffective.

窓材料としては表1に示す特性を示すセラミックス材料
である。
The window material is a ceramic material exhibiting the characteristics shown in Table 1.

高温自己潤滑セラミックス材料の、基材料表面への被覆
の方法としては、プラズマジェットによる溶射等では密
着強度が不十分なので、さらに常圧焼結、HIP法を併
用したり、あるいは粉末に埋没してのホットプレス、H
Ip法。
As a method for coating the surface of a base material with high-temperature self-lubricating ceramic materials, thermal spraying using a plasma jet, etc., does not provide sufficient adhesion strength, so pressureless sintering, HIP method, or embedding in powder is also used. hot press, H
Ip method.

アイソスタテックプレス後の常圧焼結法等の方法で作成
することとする。作成条件の目安はIIIP法の場合、
温度1000ないし2500℃、圧力10ないし300
0気圧の範囲から選択する。他の方法の場合はこれに準
じて選択する。
It will be produced by a method such as a pressureless sintering method after isostatic pressing. In the case of the IIIP method, the approximate preparation conditions are:
Temperature 1000 to 2500℃, pressure 10 to 300℃
Select from the range of 0 atmospheric pressure. For other methods, select accordingly.

以下実施例を説明する。Examples will be described below.

実施例1 8@1図は、 5LsN4よりなる窓材料にCr、O,
ヨQ fする高温自己潤滑セラミックス材料を破口した
構造材料を、500℃の無潤滑高温大気中でl OKv
/cjの荷重を加えて摺動した場合の表面粗さ曲線であ
る。摺動範囲に於てもほとんど傷を生ぜず、゛加熱によ
る亀裂も生じていない。
Example 1 Figure 8@1 shows a window material made of 5LsN4 containing Cr, O,
A structural material made of a high-temperature self-lubricating ceramic material with a cracked opening is heated in an unlubricated high-temperature atmosphere at 500°C.
This is a surface roughness curve when sliding with a load of /cj applied. Almost no scratches occur in the sliding range, and no cracks occur due to heating.

比較例 第2図は、Si、N、よりなる窓材料をそのまま構造材
料にして上記と同じ<500℃の高温大気中で摺動した
場合の表面粗さ曲線である。第1図とンILつて摺動に
よって著しい損傷が生じていることがわかる。
Comparative Example FIG. 2 shows a surface roughness curve when a window material made of Si and N is used as a structural material and is slid in the same high-temperature atmosphere of <500° C. as above. It can be seen from FIG. 1 that significant damage was caused by sliding.

第3図は、炭床鋼よりなる窓材料にC?!0. よりな
る高温自己潤滑セラミックス材料を被覆した構造材料に
500℃の高温下で摺動した場合の表面粗さ曲線であり
、この場合は熱膨張の差による亀裂が一面に生じている
ことがわかる。
Figure 3 shows the window material made of coal bed steel. ! 0. This is a surface roughness curve when a structural material coated with a high-temperature self-lubricating ceramic material made of the following materials is slid at a high temperature of 500°C.

また窓材料が金属であると熱膨張率の大ぎな差のため高
温でセラミックス被膜中に引っばり応力を生じ微細なり
ラックを発生する。
Furthermore, when the window material is metal, the large difference in coefficient of thermal expansion causes tensile stress in the ceramic coating at high temperatures, resulting in the generation of fine racks.

上記した如く、窓材料の表面に高温自己潤滑セラミック
ス材料(例: Cr、01 )を被覆する方法を行なう
と各使用算器気中、高温での摺動特性が良好なため摺動
損傷を生じにくく、摺動損傷による強度低下を防止出来
る材料を選べる有利さがある。
As mentioned above, if the surface of the window material is coated with a high-temperature self-lubricating ceramic material (e.g. Cr, 01), sliding damage may occur due to the good sliding properties of each device in air and at high temperatures. It is advantageous to be able to choose a material that is difficult to use and can prevent a decrease in strength due to sliding damage.

実施例2 表2に窓材料としてSi、N、を用いこの窓材料並びに
耐摺動損傷特性を示す。
Example 2 Table 2 shows the window materials and their sliding damage resistance using Si and N as window materials.

実施例3 表3に窓材料としてSiCを用いこの窓材料に各種の高
温自己潤滑セラミックス材料を被覆した耐熱耐摺動損傷
無機系構造材料セラミックス材料の摺動特性並びに耐摺
動損傷特性を示す。
Example 3 Table 3 shows the sliding characteristics and sliding damage resistance of a heat resistant and sliding damage resistant inorganic structural material ceramic material using SiC as the window material and coating the window material with various high temperature self-lubricating ceramic materials.

実施例4 表4に基材料としてZrO,を用いこの基材料に各種の
高温自己油滑セラミックス材料を被覆した耐熱耐抽動損
傷無機系構造材料セラミックス材料の振動特性並びに耐
摺動損傷特性を示す。
Example 4 Table 4 shows the vibration characteristics and sliding damage resistance of a heat-resistant, drawing damage-resistant, inorganic structural ceramic material using ZrO as the base material and coating the base material with various high-temperature self-lubricating ceramic materials.

実施例5 表5に基材料としてAt、O5を用いこの基材料に各種
の高温自己潤滑セラミックス材料を被覆した耐熱耐摺動
損傷無機系構造材料セラミックス材料の摺動特性並びに
耐摺動損傷特性を示す。
Example 5 Table 5 shows the sliding characteristics and sliding damage resistance of the heat-resistant and sliding damage-resistant inorganic structural materials and ceramic materials using At and O5 as the base materials and coating the base materials with various high-temperature self-lubricating ceramic materials. show.

実施例6 表6に基材料として5i−41−0−Nを用いこの基材
料に各種の高温自己潤滑セラミックス材料を被板した耐
熱耐摺動損傷無機系構造材料セラミックス材料の摺動特
性並びに耐摺動損傷特性を示す。
Example 6 Table 6 shows the sliding properties and resistance of inorganic structural materials and ceramic materials that use 5i-41-0-N as the base material and cover this base material with various high-temperature self-lubricating ceramic materials. Indicates sliding damage characteristics.

実施例7 表7に基材料として超硬サーメットを用いこの基材料に
各種の高温自己潤滑セラミックス材料を被覆した耐熱耐
摺動損傷無機系構造材料セラミックス材料の摺動特性並
びに耐摺動損傷特性を示す。
Example 7 Table 7 shows the sliding characteristics and sliding damage resistance of heat-resistant and sliding damage-resistant inorganic structural materials and ceramic materials using carbide cermet as the base material and coating this base material with various high-temperature self-lubricating ceramic materials. show.

実施例8 表8に基材料としてAINを用いこの基材料に各種の高
温自己1滑セラミツクス材料を被δ’fした耐熱耐摺動
損傷無機系構造材料セラミックス材料の摺動特性並びに
耐摺動損傷特性を示す。
Example 8 Table 8 shows the sliding characteristics and sliding damage resistance of inorganic structural materials and ceramic materials in which AIN was used as the base material and various high-temperature self-sliding ceramic materials were coated on this base material. Show characteristics.

実fr[i例9 表9に基材料EしてAtNサーメットを用いこの基材料
に各種の高温自己潤滑セラミックス材料を被覆した耐熱
耐摺動損傷無機系構造材料セラミックス材料の摺動特性
並びに耐摺動損傷特性を示す。
Actual fr[i Example 9 In Table 9, the base material E is AtN cermet, and this base material is coated with various high-temperature self-lubricating ceramic materials.Inorganic structural materials Sliding properties and sliding resistance of ceramic materials Indicates dynamic damage characteristics.

実施例10 表10に基材料としてTiNを用いこの基材料に各種の
高温自己潤滑セラミックス材料を被覆した耐熱耐摺動損
傷無機系構造材料セラミックス材料の摺動特性並びに耐
摺動損傷特性な示鳴実施例11 illに基材料としてBNを用いこの基材料に各種の高
温自己潤滑セラミックス材料を被覆。
Example 10 In Table 10, TiN is used as the base material, and this base material is coated with various high-temperature self-lubricating ceramic materials.Sliding properties and sliding damage-resistant properties of heat-resistant and sliding damage-resistant inorganic structural materials and ceramic materials are shown. Example 11 BN was used as a base material for ill, and this base material was coated with various high-temperature self-lubricating ceramic materials.

した耐熱耐摺動損傷無機系構造材料セラミックス材料の
摺動特性並びに耐摺動損傷特性を示す。
The sliding characteristics and sliding damage resistance of heat-resistant and sliding damage-resistant inorganic structural materials and ceramic materials are shown.

以下余白 表2〜表11を次に示す。Below margin Tables 2 to 11 are shown below.

表2〜表11において摺動試験条件1.Fは次の通りで
ある。
In Tables 2 to 11, sliding test conditions 1. F is as follows.

、4:無給油で400℃以下 B:無給油で500〜700℃ C:合成油(1!滑油)、400℃以下D=合り油(潤
滑油)、 400℃以下E:合成油+硫化物添加、40
0 ℃以下F:E、Sガス雰囲気、+0001?:本発
明は以上詳述したように、金属窒化物(Si、N4. 
AIM 、 i’iN 、 BN )もしくは金属炭化
物(IC、TiC)、金属i′12化物(Al、Oa、
 ZrO,)などのセラミックス材料、または前記金属
窒化物。
, 4: 400℃ or less without lubrication B: 500 to 700℃ without lubrication C: Synthetic oil (1! Lubricating oil), 400℃ or less D = Synthetic oil (lubricating oil), 400℃ or less E: Synthetic oil + Sulfide addition, 40
0 ℃ or less F: E, S gas atmosphere, +0001? : As detailed above, the present invention is applicable to metal nitrides (Si, N4.
AIM, i'iN, BN) or metal carbide (IC, TiC), metal i'12 compound (Al, Oa,
Ceramic materials such as ZrO, ) or the metal nitrides mentioned above.

金属炭化物、金属酸化物等を主成分とするサーメツト材
を窓材料とし、窓材料の表面を惰温自己潤滑セラミック
ス材料で被覆したことを特徴とする耐熱耐摺動損傷無機
系構造材料である。
This is a heat-resistant and sliding damage-resistant inorganic structural material characterized by using a cermet material whose main component is metal carbide, metal oxide, etc. as the window material, and coating the surface of the window material with an inertia-temperature self-lubricating ceramic material.

したがって、この耐熱耐摺動損傷無機系構造材料は、各
使用雰囲気中、高温での摺動特性が良好で摺動損傷が生
じにくく摺動損傷による強度低下のないものとなる。
Therefore, this heat-resistant and sliding damage-resistant inorganic structural material has good sliding properties at high temperatures in various usage atmospheres, and is less susceptible to sliding damage and does not suffer from a decrease in strength due to sliding damage.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は、Si、N4 よりなる窓材料にCrtO8よ
りなる高温自己潤滑セラミックス材料を被覆した構造材
料を、500℃の熱潤滑高温大気中で10に4/cdの
荷重を加えて摺動した場合の表面粗さ曲線図、第2図は
、Si、7v4 よりなる窓材料をそのまま構造材料に
上記と同じり500℃の高温大気中で摺動した場合の表
面粗さ曲線図、第3図は。 炭棄鋼よりなる窓材料にCr10B よりなる高温自己
潤滑セラミックス材料を被覆した構造材料に500℃の
高温下で摺動した場合の表面粗さ曲線図である。 出願人 工業技術院長 川 1)裕 部科学技術庁無機
材質研究所長 後 藤 優 株式会社 小松製作所 指定代理人 工業技術院機械技術研究所長金 井 実 
徳 復代理人弁理士 米 原 正 章 弁理士浜本 忠 代理人弁理士 米 原 正 章 弁理士 浜 本 忠
Figure 1 shows a structural material in which a window material made of Si and N4 is coated with a high-temperature self-lubricating ceramic material made of CrtO8, and the structural material is slid in a heat-lubricated high-temperature atmosphere at 500°C under a load of 10 to 4/cd. Figure 2 is a surface roughness curve diagram when a window material made of Si, 7v4 is slid as it is on a structural material in the same high temperature atmosphere of 500°C as above, Figure 3. teeth. It is a surface roughness curve diagram when a structural material in which a window material made of carbon steel is coated with a high temperature self-lubricating ceramic material made of Cr10B is slid at a high temperature of 500°C. Applicant: Director of the Agency of Industrial Science and Technology Kawa 1) Yutaka Yugo, Director of the Inorganic Materials Research Institute, Agency of Science and Technology; Masaru Fuji, Komatsu Ltd. Appointed representative of Komatsu Ltd. Director of the Institute of Mechanical Technology, Agency of Industrial Science and Technology Minoru Kanei
Tokufu's Patent Attorney Masaaki Yonehara Patent Attorney Tadashi Hamamoto Patent Attorney Masaaki Yonehara Patent Attorney Tadashi Hamamoto

Claims (1)

【特許請求の範囲】 金属窒化物(Si、N4. AIN、 TiN、 BN
 )もしくは金属炭化物(TF’C、5iC) 、金属
酸化物(41tO。 ZrO,)等のセラミックス材料、または前記金属窒化
物蓋しくは金属炭化物、金属酸化物等を主成分とし若干
の金属を含むサーメツト材を芯材料とし、この芯材料の
表面を高温自己潤滑性セラミックス材料で被覆したこと
を特徴とする耐熱耐摺動損傷無機系構造材料。
[Claims] Metal nitrides (Si, N4.AIN, TiN, BN
) or ceramic materials such as metal carbides (TF'C, 5iC), metal oxides (41tO, ZrO,), or metal nitrides, metal carbides, metal oxides, etc. as the main components and some metals. A heat-resistant and sliding damage-resistant inorganic structural material characterized by using a cermet material as a core material and coating the surface of this core material with a high-temperature self-lubricating ceramic material.
JP58179188A 1983-09-29 1983-09-29 Heat resistant and sliding damage resistant inorganic structural material Granted JPS6071581A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58179188A JPS6071581A (en) 1983-09-29 1983-09-29 Heat resistant and sliding damage resistant inorganic structural material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58179188A JPS6071581A (en) 1983-09-29 1983-09-29 Heat resistant and sliding damage resistant inorganic structural material

Publications (2)

Publication Number Publication Date
JPS6071581A true JPS6071581A (en) 1985-04-23
JPH059394B2 JPH059394B2 (en) 1993-02-04

Family

ID=16061473

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58179188A Granted JPS6071581A (en) 1983-09-29 1983-09-29 Heat resistant and sliding damage resistant inorganic structural material

Country Status (1)

Country Link
JP (1) JPS6071581A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6257905A (en) * 1985-08-02 1987-03-13 Asahi Chem Ind Co Ltd Spinneret
JPS6321748U (en) * 1986-07-25 1988-02-13
FR2660930A1 (en) * 1990-04-13 1991-10-18 Ceramiques Composites LUBRICANT FOR CERAMIC SURFACE AND LUBRICATION METHOD.
JPH03260047A (en) * 1990-03-09 1991-11-20 Agency Of Ind Science & Technol Thermal spraying material having wear resistance at high temperature and its production
JPH05340212A (en) * 1992-06-05 1993-12-21 Sumitomo Electric Ind Ltd Adjusting shim made of ceramics
EP0816698A1 (en) * 1996-03-07 1998-01-07 SKF Nova AB Lubricated rolling contact devices, a method for lubricating these and a composition suitable for such lubrication

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58204883A (en) * 1982-05-20 1983-11-29 九州耐火煉瓦株式会社 Mechanical part with ceramic sliding portion
JPS59137375A (en) * 1983-01-25 1984-08-07 トヨタ自動車株式会社 Silicon nitride sintered body with sliding properties

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58204883A (en) * 1982-05-20 1983-11-29 九州耐火煉瓦株式会社 Mechanical part with ceramic sliding portion
JPS59137375A (en) * 1983-01-25 1984-08-07 トヨタ自動車株式会社 Silicon nitride sintered body with sliding properties

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6257905A (en) * 1985-08-02 1987-03-13 Asahi Chem Ind Co Ltd Spinneret
JPS6321748U (en) * 1986-07-25 1988-02-13
JPH03260047A (en) * 1990-03-09 1991-11-20 Agency Of Ind Science & Technol Thermal spraying material having wear resistance at high temperature and its production
JPH0536501B2 (en) * 1990-03-09 1993-05-31 Kogyo Gijutsu Incho
FR2660930A1 (en) * 1990-04-13 1991-10-18 Ceramiques Composites LUBRICANT FOR CERAMIC SURFACE AND LUBRICATION METHOD.
JPH05340212A (en) * 1992-06-05 1993-12-21 Sumitomo Electric Ind Ltd Adjusting shim made of ceramics
EP0816698A1 (en) * 1996-03-07 1998-01-07 SKF Nova AB Lubricated rolling contact devices, a method for lubricating these and a composition suitable for such lubrication
CN1082152C (en) * 1996-03-07 2002-04-03 斯克弗·诺瓦公司 Lubricated rolling contact devices, method for lubricating these and composition suitable for such lubrication

Also Published As

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