Surfactant Influence on the Tribological Properties of Bentonite-Based Greases

2005 ◽  
Author(s):  
A. K. Pogosian ◽  
T. R. Martirosyan
Keyword(s):  
Tribological Properties ◽  
High Pressures ◽  
Nano Particles ◽  
Ammonium Salts ◽  
Quaternary Amine ◽  
Wear Properties ◽  
Natural Minerals ◽  
New Type ◽  
Plastic Lubricants ◽  
Properties Of Composites

Development of new type plastic lubricants capable of sustaining high pressures is thus important by using natural minerals. The effect of surfactant ration and structure of thickener nano-particles surfaces on the tribological properties of bentonite-based greases was studied. The best anti-friction and anti-wear properties of plastic lubricants were revealed at the particles modified by quaternary amine and urotropine type ammonium salts, and the necessary ratio for the bentonite particles surface modification by quarterly ammonium salts was revealed, which provide the best tribological properties of composites.

Impact of Surfactant Structure on the Tribological Properties of Bentonite-Based Greases

2007 ◽  
Vol 129 (4) ◽  
pp. 920-922 ◽  
Author(s):  
A. K. Pogosian ◽  
T. R. Martirosyan
Keyword(s):  
High Pressure ◽  
Tribological Properties ◽  
Quaternary Ammonium ◽  
Quaternary Ammonium Salts ◽  
Ammonium Salts ◽  
Quaternary Amine ◽  
Wear Properties ◽  
Natural Minerals ◽  
The One ◽  
Plastic Lubricants

The development of new types of high-pressure plastic lubricants using natural minerals is of much importance. The effects of surfactant proportion and the structure of the nanoparticle thickener surface on the tribological properties of the bentonite-based grease were studied. The plastic lubricants that provide the best anti-friction and anti-wear properties were revealed to be the one that is modified by quaternary amine and urotropine-type ammonium salts. The surface ratio of bentonite particles modified by quaternary ammonium salts, which results in composite with the best tribological properties, was also revealed.

scholarly journals Fabrication and Tribological Properties of Copper Matrix Solid Self-Lubricant Composites Reinforced with Ni/NbSe2 Composites

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1854
Author(s):  
Fei-xia Zhang ◽  
Yan-qiu Chu ◽  
Chang-sheng Li
Keyword(s):  
Powder Metallurgy ◽  
Friction Coefficient ◽  
Wear Rate ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Copper Matrix ◽  
Wear Properties ◽  
Disk Friction ◽  
Friction Reducing ◽  
Properties Of Composites

This paper presents a facile and effective method for preparing Ni/NbSe2 composites in order to improve the wettability of NbSe2 and copper matrix, which is helpful in enhancing the friction-reducing and anti-wear properties of copper-based composites. The powder metallurgy (P/M) technique was used to fabricate copper-based composites with different weight fractions of Ni/NbSe2, and tribological properties of composites were evaluated by using a ball-on-disk friction-and-wear tester. Results indicated that tribological properties of copper-based composites were improved by the addition of Ni/NbSe2. In particular, copper-based composites containing 15 wt.% Ni/NbSe2 showed the lowest friction coefficient (0.16) and wear rate (4.1 × 10−5 mm3·N−1·m−1) among all composites.

Preparation and Tribological Properties of Nb1-xTixSe2 Micro/Nanoparticles

2012 ◽  
Vol 619 ◽  
pp. 536-540
Author(s):  
Jia Qing Liang ◽  
Chang Sheng Li ◽  
Hua Tang ◽  
Yi Zhang ◽  
Wen Jing Li ◽  
...  
Keyword(s):  
Tribological Properties ◽  
Friction And Wear ◽  
Sliding Friction ◽  
Layer Structure ◽  
Nano Particles ◽  
Wear Properties ◽  
Repair Work ◽  
X Ray ◽  
Friction And Wear Properties ◽  
Antiwear Ability

Nb1-xTixSe2(x=0～1) micro/nano-particles have been successfully prepared via solid-state thermal (750°C) reaction between microsized Nb, Ti with Se powders under seal environment in a seal quartz tube and characterization by X-ray diffractometer and scanning electron microscopy. It was found that the morphologies of the as-prepared products changed from microplates to micro-nanoparticles or aggregations composed of layer structure with the doping of Ti. And the amount of regular hexagonal microplates evidently reduced and nanoscaled particles increased with the increase of the contents of Ti dopant within a certain limit (1-20 atwt. %). The tribological properties of the as-prepared products as additives in paraffin were investigated by UMT-2 multispecimen tribotester. By the addition of Nb1-xTixSe2micro/nanoparticles in paraffin, the antiwear ability was improved and the friction coefficient was decreased. The paraffin with Nb1-xTixSe2micro/nanoparticles showed better tribological properties than that with pure NbSe2. A combination of the molecule-bearing mechanism of sliding friction, and fill in-repair work between the rubbing surfaces can explain the good friction and wear properties of Nb1-xTixSe2micro/nanoparticles.

Tribological properties and mechanism of the bilayer iron based powder metallurgy materials

2018 ◽  
Vol 70 (9) ◽  
pp. 1642-1648 ◽  
Author(s):  
Guotao Zhang ◽  
Yanguo Yin ◽  
Ming Xu ◽  
Congmin Li
Keyword(s):  
Powder Metallurgy ◽  
Tribological Properties ◽  
High Strength ◽  
Wear Properties ◽  
Content Type ◽  
Lubricating Property ◽  
New Type ◽  
Iron Based ◽  
Friction And Wear Properties ◽  
Better Than

Purpose This paper aims to obtain high mechanical strength and good self-lubricating property of iron-based powder metallurgy materials. A new type of bilayer material with dense substrate and porous surface was proposed in this paper to obtain high strength and good self-lubricating property. Design/methodology/approach The materials were prepared by powder metallurgy. Their friction and wear properties were investigated with an end-face tribo-tester. Energy dispersive spectrometer, X-ray diffraction and the 3D laser scanning technologies were used to characterise the tribological properties of materials. The tribological and bearing mechanisms of the monolayer and bilayer materials were compared. Findings The results show that adding proper TiH2 can effectively improve the porosity and hardness. With the TiH2 content increased from 0 to 4 per cent, the average friction coefficients increase slowly, and the wearability decreases first and then increases. When containing 3.5 per cent TiH2, high strength and good self-lubrication characteristics are obtained. Besides, the tribological properties of monolayer materials are better than those of bilayer materials when the load is between 980 and 1,470 N, while the opposite result is obtained under the load varied from 1,470 to 2,450 N. In the bilayer material, the porous oil surface can lubricate well and the dense substrate can improve the mechanical property. So, its comprehensive tribological and mechanical properties are better than those of monolayer material. Originality/value The friction and wear properties of a new type bilayer materials were investigated. And their tribological mechanisms were proposed. This work can provide a theoretical reference for developing high-performance iron-based oil materials under boundary lubrication.

The Addition of Acid Treated Carbon Nanotube on the Tribological Properties of Carbon Fiber Reinforced UHMWPE Composite

2011 ◽  
Vol 194-196 ◽  
pp. 1685-1688
Author(s):  
Jian Li
Keyword(s):  
Carbon Nanotube ◽  
Carbon Fiber ◽  
Tribological Properties ◽  
Fiber Reinforced ◽  
Wear Properties ◽  
Friction And Wear Properties ◽  
Carbon Fiber Reinforced ◽  
Treated Carbon ◽  
Ultra High Molecular Weight ◽  
Properties Of Composites

Carbon fiber reinforced Ultra High Molecular Weight Polyethylene (CF/UHMWPE) composites have been filled with acid treated carbon nanotube to enhance the tribological properties. According to the modification, the friction and wear properties of composites have been greatly improved. XPS and SEM are used to examine the microscopic properties of resultant composites. The enhanced tribological properties are attributed to the acid treated CNT interlock, which improves the wetting between carbon fibers and resins.

The Tribological Properties of Several PTFE Based Self-Lubricating Composites in Vacuum

2012 ◽  
Vol 535-537 ◽  
pp. 144-148 ◽  
Author(s):  
Jun Zheng ◽  
Hui Zhou ◽  
Zhi Hua Wan ◽  
Rui Peng Sang
Keyword(s):  
Wear Rate ◽  
Tribological Properties ◽  
Volumetric Wear ◽  
Wear Properties ◽  
Depth Sensing ◽  
Result Show ◽  
Friction And Wear Properties ◽  
Steel Balls ◽  
Properties Of Composites ◽  
Self Lubricating Composites

Five commercial PTFE based self-lubricating composites were selected for candidates in space. The hardness was measured by depth-sensing indentation in CMC mode. The tribological properties of composites sliding against a 440C steel balls were investigated using a vacuum rotational ball-on-disc apparatus. The result show the hardness of Rulon 945, Rulon XL, GR 0348, D 5813 and LW 155 are about 62.01 MPa, 45.42 MPa, 84.62 MPa, 116.59 MPa and 569.40 MPa, which are higher than pure PTFE composite. The friction coefficient of Rulon 945, Rulon XL,GR 0348, D 5813, LW 155 obtained in vacuum are, 0.08 to 0.20, 0.06 to 0.10, 0.05 to 0.10, 0.06 to 0.10 and 0.05 to 0.15. Rulon XL, GR 0348 and D 5813 show very stable friction level around 0.08. For volumetric wear rate, D 5813 have the biggest volumetric wear rate of 2.36×10-7mm3/mm, which is twelve times of Rulon 945 and nearly five times of Rulon XL, GR 0348 and LW 155. Rulon XL and GR 0348 have the best friction and wear properties.

scholarly journals Tribological performance of various metal-doped carbon dots as water-based lubricant additives and their potential application as additives of poly(ethylene glycol)

Friction ◽  
2021 ◽  
Author(s):  
Weiwei Tang ◽  
Xuejun Zhu ◽  
Yufeng Li
Keyword(s):  
Ethylene Glycol ◽  
Tribological Properties ◽  
Carbon Dots ◽  
Lubricant Additives ◽  
Poly Ethylene Glycol ◽  
Wear Properties ◽  
Water Based ◽  
Friction Reducing ◽  
Poly Ethylene ◽  
Metal Doped

AbstractAdvances in nano-lubricant additives are vital to the pursuit of energy efficiency and sustainable development. Carbon dots (CDs) have been widely investigated in the domain of lubricant additives owing to their extraordinary tribological properties, in particular, their friction-reducing and anti-wear properties. Metal-doped CDs are a new type of CDs, and their friction-reducing and anti-wear properties are attracting increasing attention. Therefore, a series of CDs doped with various divalent metal ions have been successfully synthesized via one-pot pyrolysis. The tribological properties of the synthesized CDs as water-based lubricant additives are in the following order: Zn-CDs > Cu-CDs ≫ Mg-CDs > Fe-CDs > U-CDs. Specifically, adding 1.0 wt% of Zn-CDs into water-based lubricant results in 62.5% friction and 81.8% wear reduction. Meanwhile, the load-carrying capacity of the water-based lubricant increases from 120 N to at least 500 N. Zn-CDs as an additive have long service life. Additionally, anion-tuned Zn-CDs fabricated via anion exchange exhibit promise as lubricant additives for poly(ethylene glycol). Based on the results of wear scar surface analyses, it is discovered that tribochemical films, primarily composed of iron oxides, nitrides, metal carbonates, zinc oxides, zinc carbonates, organic compounds, and embedded carbon cores, formed on the rubbing surfaces with a thickness of approximately 270 nm when Zn-CDs are used as additives. This film combined with the “ball-bearing” and third-particle effects of Zn-CDs contributed to excellent lubrication performance.

Improvement of Electrical Insulating and Anti-Wear Properties of Composites Used in Telemetry Systems

2015 ◽  
Vol 792 ◽  
pp. 578-581
Author(s):  
A.R. Gallyamov ◽  
I.D. Ibatullin ◽  
A.Y. Murzin
Keyword(s):  
Composite Materials ◽  
Epoxide Resin ◽  
Wear Properties ◽  
Research Results ◽  
Tribotechnical Properties ◽  
Properties Of Composites

This article deals with the research results of electroinsulated and tribotechnical properties of composite materials on the basis of epoxide resin. The effect of fillers — micro-and nanopowders of various materials - on the properties of composites is examined. The use of composites in the manufacture of separators for telemetry systems is demonstrated.

Amorphous Carbon Coatings for Locally Adjusted Tribological Properties in Sheet Bulk Metal Forming

2012 ◽  
Vol 504-506 ◽  
pp. 969-974 ◽  
Author(s):  
Harald Hetzner ◽  
Stephan Tremmel ◽  
Sandro Wartzack
Keyword(s):  
Amorphous Carbon ◽  
Tribological Properties ◽  
Metal Forming ◽  
Friction And Wear ◽  
Wear Properties ◽  
Carbon Coatings ◽  
Bulk Metal ◽  
Bulk Metal Forming ◽  
Friction And Wear Properties ◽  
Amorphous Carbon Coatings

In sheet bulk metal forming, locally adapted friction properties of the contact tool/workpiece are an appropriate means for the targeted enhancement of the material flow, enabling an improved form filling and lowered forming forces. However, the implementation of desirable friction conditions is not trivial. And further, friction is inseparably linked to wear and damage of the contacting surfaces. This calls for a methodological approach in order to consider tribology as a whole already in the early phases of process layout, so that tribological measures which allow fulfilling the requirements concerning local friction and wear properties of the tool surfaces, can already be selected during the conceptual design of the forming tools. Thin tribological coatings are an effective way of improving the friction and wear properties of functional surfaces. Metal-modified amorphous carbon coatings, which are still rather new to the field of metal forming, allow tackling friction and wear simultaneously. Unlike many other types of amorphous carbon, they have the mechanical toughness to be used in sheet bulk metal forming, and at the same time their friction properties can be varied over wide ranges by proper choice of the deposition parameters. Based on concrete research results, the mechanical, structural and special tribological properties of tungsten-modified hydrogenated amorphous carbon coatings (a-C:H:W) are presented and discussed against the background of the tribological requirements of a typical sheet bulk metal forming process.

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