Investigation of binders for solid lubricants at elevated temperatures

Wear ◽  
1964 ◽  
Vol 7 (3) ◽  
pp. 308
Keyword(s):  
Elevated Temperatures ◽  
Solid Lubricants

Tribological Behavior of Ni-Based Self-Lubricating Composites at Elevated Temperatures

2015 ◽  
pp. 72-106
Author(s):  
Jianliang Li ◽  
Dangsheng Xiong ◽  
Yongkun Qin ◽  
Rajnesh Tyagi
Keyword(s):  
High Temperature ◽  
Friction And Wear ◽  
Solid Lubricant ◽  
Elevated Temperatures ◽  
Wear Behavior ◽  
Composite Coatings ◽  
Solid Lubricants ◽  
Friction And Wear Behavior ◽  
Nickel Base ◽  
Self Lubricating Composites

This chapter illustrates the effect of the addition of solid lubricants on the high temperature friction and wear behavior of Ni-based composites. Ni-based composites containing solid lubricant particles both in nano and micrometer range have been fabricated through powder metallurgy route. In order to explore the possible synergetic action of a combination of low and high temperature solid lubricant, nano or micro powders of two or more solid lubricants were added in the composites. This chapter introduces the fabrication of the Ni-based self-lubricating composites containing graphite and/or MoS2, Ag and/or rare earth, Ag and/or hBN as solid lubricants and their friction and wear behavior at room and elevated temperatures. The chapter also includes information on some lubricating composite coatings such as electro-deposited nickel-base coating containing graphite, MoS2, or BN and graphene and their tribological characteristics.

Process Windows and Properties of Tungstenand Vanadium-Oxides Deposited by MSIP-PVD-Process

1998 ◽  
Vol 555 ◽  
Author(s):  
O. Knotek ◽  
E. Lugscheider ◽  
S. Bäarwulf ◽  
C. Barimani
Keyword(s):  
Gas Flow ◽  
Elevated Temperatures ◽  
Stable Process ◽  
Oxidation Stability ◽  
Solid Lubricants ◽  
Vanadium Oxides ◽  
Atmospheric Conditions ◽  
Flow Process ◽  
Process Failure ◽  
Oxide Phases

AbstractThe tungsten and vanadium oxides are well known to be usable as solid lubricants at elevated temperatures. Such metal-oxides are interesting for tribological insets at atmospheric conditions because of their “oxidation stability”. This paper reports about investigations made to find stable process windows for the deposition of tungsten and vanadium oxides in a reactive d.c. mode by the MSIP-PVD-process. One focus of the study is on the metal oxide-phases generated in the MSIP-process under various conditions and their mechanical and metallographic properties. Coatings were deposited, developed and analyzed by standard testing methods such as SEM, microhardness (nanoindentation), XRD and scratch testing to characterize the mechanical and structural properties. Stable process windows will be presented for the reactive mode as well as the influence of different process parameters to the microstructure and the material properties. It will be shown that it is possible to deposit vanadium-oxides despite contamination effects in wide ranges by adapting the gas-flow. Process failure was determined at 15 - 18 % oxygen partial pressure for reactively deposited tungsten oxides.

Fabrication and Tribological Properties of High Temperature Self-Lubrication Composites Prepared by Gas-Pressure Infiltration Technique

2011 ◽  
Vol 306-307 ◽  
pp. 802-807
Author(s):  
Yan Jun Wang ◽  
Bin Wang ◽  
Li Ying Yang ◽  
Shou Ren Wang
Keyword(s):  
Friction And Wear ◽  
Elevated Temperatures ◽  
Normal Load ◽  
Solid Lubricants ◽  
Pressure Infiltration ◽  
Wear Rates ◽  
Metal Ceramic ◽  
Infiltration Technique ◽  
Pin On Disk ◽  
Lubricating Properties

Powder metallurgy derived microporous Al2O3/FeCrWMoV metal ceramic preforms were infiltrated with 60Pb40Sn based solid lubricants to create almost fully dense self-lubrication composites. By means of scanning electron microscope (SEM) and energy dispersive X-ray spectrometer (EDS), it was found that 60Pb40Sn-based solid lubricants are well dispersed and embedded in the Al2O3/FeCrWMoV matrix. The friction and wear behaviors of the composites sliding against ZrO2 ceramic from ambient to 800 °C were investigated using a pin-on-disk wear tester.The results showed that the composites exhibited self-lubricating properties at elevated temperatures up to 700 °C. The friction coefficients of less than 0.27 at 600 °C and wear rates of 6×10−6 mm3/N m are obtained when rubbing against ZrO2 ceramic under a normal load of 50 N and a sliding speed of 0.139m/s for 2 hours. The occurrences of lower friction coefficient and plateau in wear rate have been related to the formation of a film of lubricant almost covered entirely the substrate beneath.

scholarly journals Formation of Solid Lubricants during High Temperature Tribology of Silver-Doped Molybdenum Nitride Coatings Deposited by dcMS and HIPIMS

Coatings ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1415
Author(s):  
Martin Fenker ◽  
Martin Balzer ◽  
Sabine Kellner ◽  
Tomas Polcar ◽  
Andreas Richter ◽  
...  
Keyword(s):  
High Temperature ◽  
Magnetron Sputtering ◽  
Elevated Temperatures ◽  
Indentation Test ◽  
Solid Lubricants ◽  
Industrial Applications ◽  
Film Deposition ◽  
Molybdenum Oxides ◽  
Molybdenum Nitride ◽  
X Ray

The coating system MoN-Ag is an interesting candidate for industrial applications as a low friction coating at elevated temperatures, due to the formation of lubricous molybdenum oxides and silver molybdates. Film deposition was performed by high-power impulse magnetron sputtering and direct current magnetron sputtering. To facilitate a future transfer to industry Mo-Ag composite targets have been sputtered in Ar/N2 atmosphere. The chemical composition of the deposited MoN-Ag films has been investigated by wavelength dispersive X-ray spectroscopy. Morphology and crystallographic phases of the films were studied by scanning electron microscopy and X-ray diffraction. To obtain film hardness in relation to Ag content and bias voltage, the instrumented indentation test was applied. Pin-on-disc tribological tests have been performed at room temperature and at high temperature (HT, 450 °C). Samples from HT tests have been analyzed by Raman measurements to identify possible molybdenum oxide and/or silver molybdate phases. At low Ag contents (≤7 at.%), coatings with a hardness of 18–31 GPa could be deposited. Friction coefficients at HT decreased with increasing Ag content. After these tests, Raman measurements revealed the MoO3 phase on all samples and the Ag2Mo4O13 phase for the highest Ag contents (~23–26 at.%).

Comparison of WC/DLC/WS2 and YSZ/Au/DLC/MoS2 “Chameleon” Coatings for Tribological Applications

2005 ◽  
Author(s):  
C. C. Baker ◽  
A. A. Voevodin ◽  
J. S. Zabinski
Keyword(s):  
Photoelectron Spectroscopy ◽  
Elevated Temperatures ◽  
Amorphous Solid ◽  
Solid Lubricants ◽  
Design Approach ◽  
Low Friction ◽  
Humid Air ◽  
X Ray ◽  
Material Systems ◽  
Coating Design

Chameleon coatings are nanocomposite systems that adapt their tribological performance to changes in environmental conditions such as humidity and temperature. In this research we have investigated the tribological properties of two nanocomposite “chameleon” coatings and compared their properties. The two material systems of interest included: (i) Diamond like carbon (DLC) matrix with nanocrystalline WC and WS2 inclusions, and (ii) Yttrium Stabilized Zirconia (YSZ) in an Au matrix with DLC and MoS2 nanoparticle inclusions. The coating design approach included formation of nanocrystalline hard carbide or oxide particles for wear resistance, embedding them into an amorphous matrix for toughness enhancement, and inclusion of nanocrystalline and/or amorphous solid lubricants for friction adaptation to different environments. The coatings were produced using a combination of laser ablation and magnetron sputtering. Chemical and structural analysis of the coatings included x-ray photoelectron spectroscopy, x-ray diffraction, transmission electron microscopy, and micro-Raman spectroscopy. Mechanical properties such as coating hardness and toughness were investigated using nanoindentation, scratch, and indentation adhesion tests. It was observed that both YSZ and WC are valuable in enhancing film toughness. The chemical analysis was used to ascertain a correlation between chemical bonding of species and frictional properties. Friction measurements were studied by cycling between humid air and dry nitrogen conditions. The graphitic carbon component imparted low friction in humid air, MoS2 and WS2 were excellent for dry N2 conditions, and Au was valuable for low friction at elevated temperatures. The direct comparison among coatings demonstrates that similar “chameleon” behavior can be achieved with different material systems, validating the universal nature of the design approach.

scholarly journals Microstructure and High-Temperature Wear Performance of FeCr Matrix Self-Lubricating Composites from Room Temperature to 800 °C

Materials ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 51 ◽  
Author(s):  
Gongjun Cui ◽  
Yanping Liu ◽  
Guijun Gao ◽  
Huiqiang Liu ◽  
Ziming Kou
Keyword(s):  
High Temperature ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Synergistic Effects ◽  
Solid Lubricants ◽  
Oxide System ◽  
Critical Threshold ◽  
Wear Rates ◽  
Tribological Behaviors ◽  
Self Lubricating Composites

FeCr matrix high-temperature self-lubricating composites reinforced by Mo, Ag, and CuO were fabricated by the powder metallurgy technique. The tribological behaviors of composites were studied at temperatures up to 800 °C. The CuO content was optimized according to the tribological results. Mo showed an obvious lubricating effect when it converted into MoO3. The bimetallic oxide system formed high-temperature solid lubricants with low shear strength. CuO reacted with MoO3 and formed CuMoO4 and Cu3Mo2O9. The composites showed an increase in the friction coefficient with the increase of CuO. However, the wear rates decreased with the increase of CuO. The critical threshold at which there was a transition of friction coefficients and wear rates from room temperature (RT) to 800 °C was 10 wt.% CuO. The Fe(Cr)-14% Mo-10.5% Ag-10% CuO composite showed the most reasonable high-temperature tribological behaviors. This was ascribed to the synergistic effects of silver, Mo, in situ formed solid lubricants (metal oxides and salt compounds), and the stable oxide film on the worn surfaces. At elevated temperatures, the dominant wear mechanism was oxidation wear.

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