US3801505A - Grease composition - Google Patents
Grease composition Download PDFInfo
- Publication number
- US3801505A US3801505A US00275025A US3801505DA US3801505A US 3801505 A US3801505 A US 3801505A US 00275025 A US00275025 A US 00275025A US 3801505D A US3801505D A US 3801505DA US 3801505 A US3801505 A US 3801505A
- Authority
- US
- United States
- Prior art keywords
- grease
- boron nitride
- lubricant
- tungsten disulfide
- pfpe
- 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 - Lifetime
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/06—Metal compounds
- C10M2201/061—Carbides; Hydrides; Nitrides
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/06—Metal compounds
- C10M2201/065—Sulfides; Selenides; Tellurides
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/16—Carbon dioxide
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/18—Ammonia
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2211/00—Organic non-macromolecular compounds containing halogen as ingredients in lubricant compositions
- C10M2211/06—Perfluorinated compounds
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2213/00—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2213/00—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions
- C10M2213/02—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions obtained from monomers containing carbon, hydrogen and halogen only
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2213/00—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions
- C10M2213/04—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions obtained from monomers containing carbon, hydrogen, halogen and oxygen
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2213/00—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions
- C10M2213/06—Perfluoro polymers
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2213/00—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions
- C10M2213/06—Perfluoro polymers
- C10M2213/062—Polytetrafluoroethylene [PTFE]
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/06—Instruments or other precision apparatus, e.g. damping fluids
Definitions
- This invention relates to a high temperature lubricant and more particularly to a material for utilization as a lubricant at elevated temperatures, high load and speed, under various environmental conditions.
- Certain weapon systems e.g., the XM140 automatic gun developed by Philco-Ford Corporation, are operated at high speeds thereby generating high temperatures.
- This weapon comprises a lubrication system possessing the elements of supply, distribution, retention, and lubrication.
- This system is passive in character and consists of two reservoirs which hold sutficient material to supply lubrication for about 10,000 rounds of firing.
- the lubricator pad reservoir supplies a fluid lubricant to the barrel lock lubricator and lubricator pads by means of wicki'ng.
- the second reservoir supplies a grease lubricant to the drum cam path and cam follower assembly.
- the above components of the system are difilcult to lubricate due to the high temperatures and loads generated.
- PFPE perfluoroalkylpolyether
- Additives i.e., boron nitride and tungsten disulfide were added to the base material.
- the boron nitride raises the decomposition temperature of the lubricant.
- the tungsten disulfide imparts stability to the material. Both materials serve as synergistic agents as well as lubricity agents at higher temperatures.
- Examples 1 and 2 below are examples of lubricants prepared in accordance with the present invention.
- the base grease consisted of a mixture of parts (PFPE) and 15 parts fluoroethylene telomer per parts of mixture. A range of 85-88 parts (PFPE) and 12- '15 parts fluoroethylene telomer was found operable.
- PFPE fluoroethylene having a molecular weight of around 25,000, which is sold under the trademark of Vydax-l000 by E. I. du Pont de Nemours and Co., was utilized. Production of a homogenous mixture was obtained by conventional techniques.
- the boron nitride and tungsten disulfide had a particle size of about one micron. Operable ranges of the composition include about: 80.0 to 85.0% base grease; 8.0 to 12.0% (PFPE); 2.0 to 6.0% boron nitride; and 4.0 to 12.0% tungsten disulfide.
- the grease lubricant of Example 1 was performance tested in the XM automatic gun in combination with liquid lubricant (PFPE).
- PFPE liquid lubricant
- the liquid (PFPE) was utilized to lubricate the barrel lock lubricator pads and lock collar of the system.
- the temperature of the lubrcated path of the cam and cam follower assembly of the gun system exceeded 1400 F. with the loads of 80,000 psi and velocities of 1000 feet per minute.
- the XM140 gun was successfully fired for over 60,000 rounds Without signs of wear or galling to the system.
- the polytetrafluoroethylene utilized (TL-126) is commercially available from Liquid Nitrogen Processing Corporation of Malvern, Pa. Operable ranges of the above components include about: 60 to 62% (PFPE); 30 to 32% polytetrafluoroethylene; 2 to 6% boron nitride; and 4 to 12% tungsten disulfide.
- the polytetrafluoroethylene had a particle size of 8 to 10 microns.
- the boron nitride and tungsten disulfide had a particle size of about one micron.
- the amounts and proportions of components of the present solid lubricants are critical when used in conjunction with the XM14-0 automatic gun. For example, too large an increase or decrease in consistency as affected by various concentrations of additives or base oil would affect the degree of firmness of the grease. Any higher or lower consistency would affect the amount of grease ejected from the reservoir per ejection. Since the reservoir was specified to hold enough grease to last 10,000 rounds per each relubrication cycle, any deviation would affect the reliability of the weapon. If the con- 3 sistency of the grease is increased by 10%, this would cause greater amounts of grease to be depleted and, instead of lasting 10,000 rounds, the reservoir may be depleted, e.g., at the end of 8,000 rounds. Lack of lubrication in the remaining 2,000 would cause the weapon to become malfunctional.
- present lubricants have been described as having utility in an automatic gun assembly, it is obvious that the present lubricants may be utilized in any system requiring a lubricant resistant to elevated temperatures, high load, and performance.
- Percent Perfluoroalkylpolyether (M.W. about 7,500) 7 686.8 Polytetrafluoroethylene (M.W. about 25,000) 9.6-12.75 Boron nitride 2-6 Tungsten disulfide 4-12 Percent Perfluoroalkylpolyether 80 P'olytetrafluoroethylene l2 Boron nitride 4 Tungsten disulfide 4 References Cited UNITED STATES PATENTS 3,213,024 10/1965 Blake et al. 252-12 3,250,808 5/1966 Moore et a1.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Lubricants (AREA)
Abstract
GREASE CONSISTING OF PERFLUOROALKYLPOLYETHER BASE OIL THICKENED WITH POLYTETRAFLUOROETHYLENE AND CONTAINING MINOR AMOUNTS OF BORON NITRIDE AND TUNGSTEN DISULFIDE.
Description
United States Patent 01 ice 3,801,505 Patented Apr. 2, 1974 3,801,505 GREASE COMPOSITION Van Y. S. Hong, Rock Island, 111., assignor to the United States of America as represented by the Secretary of the Army No Drawing. Filed July 25, 1972, Ser. No. 275,025 Int. Cl. Cm 7/18, 7/28 US. Cl. 252-25 2 Claims ABSTRACT OF THE DISCLOSURE Grease consising of perfluoroalkylpolyether base oil thickened with polytetrafluoroethylene and containing minor amounts of boron nitride and tungsten disulfide.
The invention described herein may be manufactured, used, and licensed by or for the Government for governmental purposes without the payment to me of any royalty thereon.
This invention relates to a high temperature lubricant and more particularly to a material for utilization as a lubricant at elevated temperatures, high load and speed, under various environmental conditions.
Certain weapon systems, e.g., the XM140 automatic gun developed by Philco-Ford Corporation, are operated at high speeds thereby generating high temperatures. This weapon comprises a lubrication system possessing the elements of supply, distribution, retention, and lubrication. This system is passive in character and consists of two reservoirs which hold sutficient material to supply lubrication for about 10,000 rounds of firing. The lubricator pad reservoir supplies a fluid lubricant to the barrel lock lubricator and lubricator pads by means of wicki'ng. The second reservoir supplies a grease lubricant to the drum cam path and cam follower assembly. The above components of the system are difilcult to lubricate due to the high temperatures and loads generated.
It is an object of the present invention to provide and disclose metallic surface lubricants effective in inhibiting wear or galling at elevated temperature gradients up to about 1500 F.
It is a further object of the present invention to provide and disclose metallic surface lubricants effective in inhibiting wear or galling at elevated temperatures under high loads.
Other objects and a fuller understanding of the invention may be ascertained from the following description and claims.
C o m m e r c i a l l y available perfluoroalkylpolyether (PFPE), having a molecular weight of about 7500, which is sold under the trademark of Krytox by E. I. du Pont de Nemours and Co., has been found to be an effective liquid lubricant for utilization in the lubricator pad reservoir of the XM140 automatic gun. While (PFPE) performed satisfactorily, it decomposes at temperatures of around 670880 F. Accordingly, a solid lubricant was developed consisting of perfluoroalkylpolyether in combination with a fluorinated olefin for lubrication of components attaining higher temperatures. Additives, i.e., boron nitride and tungsten disulfide were added to the base material. The boron nitride raises the decomposition temperature of the lubricant. The tungsten disulfide imparts stability to the material. Both materials serve as synergistic agents as well as lubricity agents at higher temperatures. Set forth in Examples 1 and 2 below are examples of lubricants prepared in accordance with the present invention.
The base grease consisted of a mixture of parts (PFPE) and 15 parts fluoroethylene telomer per parts of mixture. A range of 85-88 parts (PFPE) and 12- '15 parts fluoroethylene telomer was found operable. Commercially available fluoroethylene having a molecular weight of around 25,000, which is sold under the trademark of Vydax-l000 by E. I. du Pont de Nemours and Co., was utilized. Production of a homogenous mixture was obtained by conventional techniques. The boron nitride and tungsten disulfide had a particle size of about one micron. Operable ranges of the composition include about: 80.0 to 85.0% base grease; 8.0 to 12.0% (PFPE); 2.0 to 6.0% boron nitride; and 4.0 to 12.0% tungsten disulfide.
The grease lubricant of Example 1 was performance tested in the XM automatic gun in combination with liquid lubricant (PFPE). The liquid (PFPE) was utilized to lubricate the barrel lock lubricator pads and lock collar of the system. During the firing, the temperature of the lubrcated path of the cam and cam follower assembly of the gun system exceeded 1400 F. with the loads of 80,000 psi and velocities of 1000 feet per minute. The XM140 gun was successfully fired for over 60,000 rounds Without signs of wear or galling to the system.
The polytetrafluoroethylene utilized (TL-126) is commercially available from Liquid Nitrogen Processing Corporation of Malvern, Pa. Operable ranges of the above components include about: 60 to 62% (PFPE); 30 to 32% polytetrafluoroethylene; 2 to 6% boron nitride; and 4 to 12% tungsten disulfide. The polytetrafluoroethylene had a particle size of 8 to 10 microns. The boron nitride and tungsten disulfide had a particle size of about one micron. [while the material of Example 2 has not been performance tested in conjunction with the XM140 automatic gun, it is considered to be an effective solid lubricant based on laboratory evaluations. Set forth in the tables below is a comparison of the material of Example 2 with the material of performance tested Example 1.
TABLE Test evaluation 1 2 1. Evaporation, FTMS, 791 to 551, wt. percent at- 400 F. for 22 hrs 500 F. for 22 hrs 2. Flammability at 1,500 F. (2 to 3 gram sam l 3. Residue at 1,500 E, wt. percent 4. Penetration at 65 F., mm./10 per ASTM (modified) 5. Wear test: Shell 4-ball wear test at 40 kg, 1,200 r.p.m.,
168 F., 1 hr. avg. wear (mm.) 6. Change in consistency from elevated temperature to cool down to ambient:
a. Penetration at 77 F. before test, mm./10 b. Penetration at 77 F. after test, mm./10
1 Flame duration of not more than 30 see, flame not over 2 inches.
The amounts and proportions of components of the present solid lubricants are critical when used in conjunction with the XM14-0 automatic gun. For example, too large an increase or decrease in consistency as affected by various concentrations of additives or base oil would affect the degree of firmness of the grease. Any higher or lower consistency would affect the amount of grease ejected from the reservoir per ejection. Since the reservoir was specified to hold enough grease to last 10,000 rounds per each relubrication cycle, any deviation would affect the reliability of the weapon. If the con- 3 sistency of the grease is increased by 10%, this would cause greater amounts of grease to be depleted and, instead of lasting 10,000 rounds, the reservoir may be depleted, e.g., at the end of 8,000 rounds. Lack of lubrication in the remaining 2,000 would cause the weapon to become malfunctional.
In addition, too high a concentration of boron nitride or tungsten disulfide would leave excessive powder at channels and vents in the skate and cam follower assembly of the system. This would clog the channels and prevent passage of continuous lubricant to high temperature lubricating sites of the roller, roller bearing, etc.
Although the present lubricants have been described as having utility in an automatic gun assembly, it is obvious that the present lubricants may be utilized in any system requiring a lubricant resistant to elevated temperatures, high load, and performance.
Having described my invention, I claim:
1. A grease composition effective at temperatures exceeding 1400 F. and having a worked penetration in the range of 200 to 300, consisting essentially of the following components in percent by weight as indicated:
Percent Perfluoroalkylpolyether (M.W. about 7,500) 7 686.8 Polytetrafluoroethylene (M.W. about 25,000) 9.6-12.75 Boron nitride 2-6 Tungsten disulfide 4-12 Percent Perfluoroalkylpolyether 80 P'olytetrafluoroethylene l2 Boron nitride 4 Tungsten disulfide 4 References Cited UNITED STATES PATENTS 3,213,024 10/1965 Blake et al. 252-12 3,250,808 5/1966 Moore et a1. 252--12 3,505,229 4/1970 Skehan 252 54 3,525,690 8/ 1970 Christian 252--25 3,658,709 4/ 1972 Christian 25254 3,691,074 9/1972 Messina et a1. 25225 3,723,317 3/1973 Ulery 252-54 20 DANIEL E. WYMAN, Primary Examiner I. VAUGHN, Assistant Examiner US. Cl. X.R.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US27502572A | 1972-07-25 | 1972-07-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3801505A true US3801505A (en) | 1974-04-02 |
Family
ID=23050598
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00275025A Expired - Lifetime US3801505A (en) | 1972-07-25 | 1972-07-25 | Grease composition |
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Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5076949A (en) * | 1989-01-29 | 1991-12-31 | Monsanto Company | Novel perfluorinated polyethers and process for their preparation |
US5120459A (en) * | 1989-01-29 | 1992-06-09 | Monsanto Company | Perfluorinated polyethers and process for their preparation |
EP0508115A1 (en) * | 1991-03-07 | 1992-10-14 | Nippon Oil Co. Ltd. | Grease composition for constant velocity joint |
JPH07102274A (en) * | 1993-09-13 | 1995-04-18 | Dow Corning Corp | Grease composition comprising fluorinated polymer oil and hexagonal lattice boron nitride |
EP0648831A2 (en) * | 1993-09-13 | 1995-04-19 | Dow Corning Corporation | High performance greases based on methylfluoroalkylsiloxanes |
US5569643A (en) * | 1991-03-07 | 1996-10-29 | Nippon Oil Co., Ltd. | Grease composition for constant velocity joint |
EP0856570A2 (en) * | 1997-01-30 | 1998-08-05 | Ausimont S.p.A. | Antiseizure and sealing pastes |
US20060093246A1 (en) * | 2003-08-25 | 2006-05-04 | Hideki Akita | Sliding bearing assembly and sliding bearing |
US7340834B1 (en) * | 2003-07-30 | 2008-03-11 | E.I. Du Pont De Nemours And Company | Method of lubricating bearings |
CN107523376A (en) * | 2017-08-24 | 2017-12-29 | 中国石油化工股份有限公司 | One kind contains Nano filling lubricant composition and preparation method |
-
1972
- 1972-07-25 US US00275025A patent/US3801505A/en not_active Expired - Lifetime
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5076949A (en) * | 1989-01-29 | 1991-12-31 | Monsanto Company | Novel perfluorinated polyethers and process for their preparation |
US5120459A (en) * | 1989-01-29 | 1992-06-09 | Monsanto Company | Perfluorinated polyethers and process for their preparation |
EP0508115A1 (en) * | 1991-03-07 | 1992-10-14 | Nippon Oil Co. Ltd. | Grease composition for constant velocity joint |
EP0558099A1 (en) * | 1991-03-07 | 1993-09-01 | Nippon Oil Co. Ltd. | Grease composition for constant velocity joint |
US5569643A (en) * | 1991-03-07 | 1996-10-29 | Nippon Oil Co., Ltd. | Grease composition for constant velocity joint |
EP0648832A1 (en) * | 1993-09-13 | 1995-04-19 | Dow Corning Corporation | Grease compositions employing fluorinated polymer oils and hexagonal lattice boron nitride |
EP0648831A2 (en) * | 1993-09-13 | 1995-04-19 | Dow Corning Corporation | High performance greases based on methylfluoroalkylsiloxanes |
EP0648831A3 (en) * | 1993-09-13 | 1996-03-13 | Dow Corning | High performance greases based on methylfluoroalkylsiloxanes. |
JPH07102274A (en) * | 1993-09-13 | 1995-04-18 | Dow Corning Corp | Grease composition comprising fluorinated polymer oil and hexagonal lattice boron nitride |
US6040277A (en) * | 1993-09-13 | 2000-03-21 | Dow Corning Corporation | Grease compositions employing fluorinated polymer oils and hexagonal lattice boron nitride |
EP0856570A2 (en) * | 1997-01-30 | 1998-08-05 | Ausimont S.p.A. | Antiseizure and sealing pastes |
EP0856570A3 (en) * | 1997-01-30 | 1999-06-23 | Ausimont S.p.A. | Antiseizure and sealing pastes |
US7340834B1 (en) * | 2003-07-30 | 2008-03-11 | E.I. Du Pont De Nemours And Company | Method of lubricating bearings |
US20060093246A1 (en) * | 2003-08-25 | 2006-05-04 | Hideki Akita | Sliding bearing assembly and sliding bearing |
CN107523376A (en) * | 2017-08-24 | 2017-12-29 | 中国石油化工股份有限公司 | One kind contains Nano filling lubricant composition and preparation method |
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