The Effect of Tribofilm Formation and Humidity on the Friction and Wear Properties of Ceramic Materials

1992 ◽  
Vol 114 (1) ◽  
pp. 131-140 ◽  
Author(s):  
K. Komvopoulos ◽  
H. Li
Keyword(s):  
Steady State ◽  
Wear Debris ◽  
Friction And Wear ◽  
Ceramic Materials ◽  
Composition Analysis ◽  
Wear Properties ◽  
Qualitative Comparison ◽  
Wear Rates ◽  
Subsurface Material ◽  
Friction And Wear Properties

The processes of tribofilm formation and disruption and the predominant tribo-mechanisms of unlubricated ceramic materials were investigated experimentally. Sliding experiments in humidity controlled atmospheres revealed that the formation of interfacial tribofilms significantly affects the steady-state friction and wear properties of ceramics. Scanning electron microscopy and various composition analysis techniques demonstrated that although tribochemical reactions might occur, the principal mechanisms of tribofilm formation were the generation, agglomeration, and compaction of fine wear debris produced from both sliding surfaces. The tribofilms exhibited different tribological characteristics, depending on their elemental compositions and the humidity. For all the ceramic pairs tested, the steady-state coefficients of friction decreased with relative humidity. In contrast to the conventional fracture toughness approach, surface profilometry and microscopy studies showed that the highest wear rates were encountered with the toughest ceramic. Plowing grooves parallel to the direction of sliding, fine wear debris of round and cylindrical shapes, microcracking, and localized delamination of the tribofilms were identified. Microscopic observations suggested that damage of the subsurface material adjacent to the interface of the tribofilms was immeasurable. Qualitative comparison of the topographical features of worn surfaces indicated that, depending on the humidity and the type of ceramic, microplasticity, microfracture, and delamination of the tribofilms were the prevailing steady-state tribomechanisms.

Effects of Lubricants on the Friction and Wear Properties of PTFE and POM

2004 ◽  
Author(s):  
Habib S. Benabdallah ◽  
Jianjun J. Wei
Keyword(s):  
Wear Debris ◽  
Friction And Wear ◽  
Wear Track ◽  
Transfer Film ◽  
Wear Properties ◽  
Wear Rates ◽  
Protective Layers ◽  
Dry Conditions ◽  
Ft Ir ◽  
Friction And Wear Properties

The friction and wear properties of PTFE and POM were investigated using a ball-on-steel ring tester under dry conditions and conditions lubricated by paraffin and 10W-30 oils. SEM, EDAX, FT-IR and surface wettability techniques were used to characterize and assess the morphology and chemical composition of the original surfaces as well as wear track, transfer film and wear debris for different loads and speeds. Although the friction was high, similar behaviours to those reported were observed. The experimentally determined surface temperature of the plastic revealed optimum loading levels for each sliding speed at which the friction and wear rates become minimal and the thermal effect stabilizes. In boundary-like lubrication using both oils, friction and wear were significantly reduced with the exception of an increase in wear rate with load when POM was lubricated with 10W-30 oil. Surface analysis revealed that the formation of lubricious protective layers on the surfaces in contact is crucial to reducing friction and more importantly wear. FT-IR results confirmed that film transfer occurs in the case of POM.

Friction Properties of Sisal Fiber Reinforced Nano-SiO2 Phenol Formaldehyde Resin Brake Composites

2014 ◽  
Vol 490-491 ◽  
pp. 64-68 ◽  
Author(s):  
Si Hua Zeng ◽  
Chun Wei ◽  
Ming Zeng ◽  
Xue Mei Xiong ◽  
Hong Xia Liu ◽  
...  
Keyword(s):  
Friction And Wear ◽  
Phenol Formaldehyde ◽  
Great Influence ◽  
Fiber Composites ◽  
Phenol Formaldehyde Resin ◽  
Sisal Fiber ◽  
Formaldehyde Resin ◽  
Wear Properties ◽  
Wear Rates ◽  
Friction And Wear Properties

The friction-resistant sisal fiber/nanoSiO2 phenol formaldehyde resin composites were prepared through compression molding. In order to enhance the bonding between the sisal fiber (SF) and polymer matrix, sisal fibers were treated with different surface modifiers (alkali, coupling agent and borax). The friction and wear properties of the composite materials were investigated with a constant speed (D-SM) tester. The worn surfaces of composites were observed by scanning electron microscope (SEM). The results showed that the adoption of nanoSiO2 phenol formaldehyde resin as matrix resin can solve the heat fade of the friction material. The friction and wear parameters of the treated sisal fiber composites can meet the requirement of standards GB5763-1998. The fiber treatment methods had great influence on the friction and wear properties of the fiber composites. Specifically, the borax treated fiber composites showed low wear rates at different temperatures. The highest friction and wear resistances of sisal fiber composites were reached when the fiber content was 15%. Our data demonstrated that the sisal fiber is an ideal substitute of asbestos for brake pads.

Friction and Wear Properties of αAlB12-NiAl Cermet Prepared by Spark Plasma Sintering

2016 ◽  
Vol 879 ◽  
pp. 1338-1343
Author(s):  
Takashi Murakami ◽  
Haruyuki Inui
Keyword(s):  
Fracture Toughness ◽  
Spark Plasma Sintering ◽  
Friction And Wear ◽  
Knoop Hardness ◽  
Wear Properties ◽  
Wear Rates ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Friction And Wear Properties ◽  
Nial Powder

In this study, αAlB12-20vol% NiAl cermet disk specimens were prepared by spark plasma sintering, and their microstructure, Knoop hardness, fracture toughness, and friction and wear properties were investigated. The αAlB12-20vol% NiAl disk specimens were obtained by spark plasma sintering blended αAlB12 and NiAl powder at 1573 K for 600 seconds. No reaction product phases were observed between the αAlB12 and NiAl phases. The αAlB12-20vol% NiAl disk specimens exhibited friction coefficients lower than 0.2 and specific wear rates as low as 1.3 × 10-6 mm3/Nm when sliding against Si3N4 ball specimens in water. O-rich phases were observed on the worn surfaces of the NiAl and αAlB12-20vol% NiAl disk specimens after sliding against Si3N4 ball specimens in water. The Knoop hardness of the disk specimens was as high as 10 GPa and the fracture toughness was as high as 7 MPa m1/2.

Friction and Wear Properties of Fe7Mo6-Based Alloy under Various Sliding Conditions

2012 ◽  
Vol 706-709 ◽  
pp. 1083-1088
Author(s):  
Takashi Murakami ◽  
Kunio Matsuzaki
Keyword(s):  
High Temperatures ◽  
Friction And Wear ◽  
Testing Temperature ◽  
Wear Properties ◽  
Friction Coefficients ◽  
Rich Phase ◽  
Wear Rates ◽  
Friction And Wear Properties ◽  
Worn Surface ◽  
Friction And Wear Tests

In this study, the friction and wear properties of the Fe7Mo6-based alloy/Al2O3 tribopair were investigated at high temperatures in air and at 298 K in water. The Fe7Mo6-based alloy/Al2O3 tribopair exhibited friction coefficients as low as 0.5 at 298 K and 873 K in air. On the other hand, this tribopair exhibited higher friction coefficients at 573 K than at 298 K and 873 K. It was also found that the friction coefficients of this tribopair were approximately 0.5 in water. The Fe7Mo6-based alloy disk specimens and their paired Al2O3 ball specimens exhibited the highest specific wear rates at 873 K in air. Oxygen-rich phase was observed on the worn surfaces of all the disk specimens. Concerning the friction and wear tests at high temperatures in air, the amount of the oxygen-rich phase increased with increasing the testing temperature. In addition, a little larger amount of the oxygen-rich phase was observed on the worn surface formed at 298 K in water than that formed at 298 K in air.

Effects of Lubricants on the Friction and Wear Properties of PTFE and POM

2005 ◽  
Vol 127 (4) ◽  
pp. 766-775 ◽  
Author(s):  
H. S. Benabdallah ◽  
J. J. Wei
Keyword(s):  
Chemical Composition ◽  
Wear Rate ◽  
Wear Debris ◽  
Friction And Wear ◽  
Wear Track ◽  
Transfer Film ◽  
Wear Properties ◽  
Protective Layers ◽  
Film Transfer ◽  
Friction And Wear Properties

The friction and wear properties of PTFE and POM were investigated using a ball-on-steel ring tester under dry and lubricated conditions by paraffin and 10W–30 oils. SEM, EDAX, FTIR, and surface wettability techniques were used to characterize and assess the morphology and chemical composition of the original surfaces, as well as the wear track, transfer film, and wear debris at different loads and speeds. Although the friction was high, similar behavior to that reported in the literature was observed. The experimentally determined surface temperature of the plastic revealed optimum loading levels, for each sliding speed, at which the friction and wear rate become a minimum and the thermal effect stabilizes. In boundary-like lubrication using both oils, friction and wear were significantly reduced with the exception of an increase in wear rate with load when POM was lubricated by 10W–30 oil. Surface analysis revealed that the formation of lubricative protective layers on the surfaces in contact is crucial to reducing friction, and more importantly, wear. FTIR results confirmed that film transfer occurs in the case of POM.

Study on the Friction and Wear Properties of Yttrium-Stabilized Zirconia Based Nanocomposite Ceramic Tool and Die Materials

2010 ◽  
Vol 154-155 ◽  
pp. 1366-1370 ◽  
Author(s):  
Chong Hai Xu ◽  
Guang Yong Wu ◽  
Yong Lian Zhang ◽  
Rong Bo Zhang
Keyword(s):  
Mechanical Properties ◽  
Wear Mechanisms ◽  
Friction And Wear ◽  
Single Phase ◽  
Cutting Tool ◽  
Ceramic Materials ◽  
Ceramic Tool ◽  
Wear Properties ◽  
Die Materials ◽  
Friction And Wear Properties

Based on the requirements for ceramic materials of cutting tool and die and the aim of improving comprehensive mechanical properties of ceramic tool and die materials, nanocomposite ceramic tool and die materials with high mechanical properties were fabricated successfully with nanometer composite method. Friction and wear properties of the developed ZrO2/Ti(C7N3) nanocomposite ceramic tool and die materials were experimentally studied in detail. Morphologies of the worn surfaces were observed and analyzed by ESEM. Wear mechanisms of nanocomposite ceramic tool and die materials were discussed with comparison with that of single-phase ZrO2 ceramics. It indicates that wear mechanisms of ZrO2/Ti(C7N3) nanocomposite ceramic tool and die materials are mechanical cold welding, abrasive wear and adhesive wear.

Friction and Wear Properties of Polyamide 66 Composites Filled with Carbon Fiber under Dry Sliding and Oil Lubricated Condition

2011 ◽  
Vol 148-149 ◽  
pp. 612-615 ◽  
Author(s):  
Zhi Yong Cai ◽  
Wen Xia Wang
Keyword(s):  
Coefficient Of Friction ◽  
Friction And Wear ◽  
Applied Pressure ◽  
Tribological Performance ◽  
Dry Sliding ◽  
Polyamide 66 ◽  
Wear Properties ◽  
Wear Rates ◽  
The Coefficient Of Friction ◽  
Friction And Wear Properties

The tribological performance of pure polyamide 66 (PA66) and Carbon fibre (CF) reinforced PA66 composite were studied at dry sliding and oil lubricated conditions. The results show that the coefficient of friction and specific wear rates for pure PA66 and CF/PA66 composite slightly in increase with the increase in applied pressure values. On the other hand the coefficient of friction is in decrease while the specific wear is in increase with the increase in sliding speed values.

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