Experimental investigation on influence of molybdenum content on tribological properties of hybrid PTFE composite

In order to improve the tribological performance of the physical vapor-deposited AlCrN coatings, molybdenum disulfide (MoS2)/poly tetra fluoroethylene (PTFE) coatings were fabricated on the AlCrN coatings surface through the thermal spraying method. The microstructure, adhesive strength, hardness, and tribological properties were investigated. Reciprocating sliding tests against SiC ball were executed with a ball-on-plate tribometer. Results showed that the adhesive strength between the AlCrN–MoS2/PTFE composite coatings and substrate was increased by about 15% compared with single AlCrN coatings. Compared with the single MoS2/PTFE coatings, the hardness of the AlCrN–MoS2/PTFE composite coatings surface was increased by about 15%. The MoS2/PTFE layer can availably reduce the friction coefficient of single AlCrN layer, and the AlCrN–MoS2/PTFE composite coatings exhibited the lowest and the most stable friction coefficient. In addition, the MoS2/PTFE layer existed on the wear track and accumulated on both the sides, which was the main reason that the friction coefficient was still lower compared with the samples without MoS2/PTFE coatings.

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Tribological properties of porous PPS/PTFE composite filled with mesopore titanium oxide whisker

Journal of Applied Polymer Science ◽

10.1002/app.38955 ◽

2013 ◽

Vol 129 (4) ◽

pp. 2321-2327 ◽

Cited By ~ 9

Author(s):

Yanji Zhu ◽

Guiying Wang ◽

Huaiyuan Wang ◽

Shuai Zhang ◽

Shuhui Yang

Keyword(s):

Titanium Oxide ◽

Tribological Properties ◽

Ptfe Composite ◽

Oxide Whisker

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ANALYSIS OF TRIBOLOGICAL PROPERTIES OF SELECTED PTFE-BASED POLYMER COMPOSITES IN A SLIDING INTERACTION WITH ALUMINIUM OXIDE (Al2O3)

Tribologia ◽

10.5604/01.3001.0012.7550 ◽

2018 ◽

Vol 280 (4) ◽

pp. 107-112 ◽

Cited By ~ 1

Author(s):

Władysław SKONECZNY ◽

Sławomir KAPTACZ ◽

Adrian BARYLSKI ◽

Tomasz KMITA

Keyword(s):

Mechanical Properties ◽

Service Life ◽

Polymer Composites ◽

Tribological Properties ◽

Mechanical Parameters ◽

Reciprocating Motion ◽

Graphite Content ◽

Mechanical And Tribological Properties ◽

Ptfe Composite ◽

Bronze Powder

The paper presents the microstructure and mechanical and tribological properties of polymer composites based on polytetrafluoroethylene (PTFE) intended for use in friction couples where reciprocating motion is performed, e.g., in compressors or actuators. Micromechanical tests carried out using the Oliver-Pharr method showed that the PTFE composite with a 40% bronze content (T8B) had the most advantageous mechanical properties (hardness H, Young’s modulus E). In turn, tribological tests that were conducted using a ballon- disc tester in the linear (reciprocating) motion showed that the polytetrafluoroethylene composite with a mixture of 25% bronze powder and 15% graphite (T4GM) had the lowest tribological wear. The tribological properties of composite T5W with 25% graphite content were not much worse. Despite the most favourable mechanical parameters, the tribological wear of composites T8B and PTFE with glassy carbon (T3Ws) was nearly twice higher due to the absence of grease formed by a graphite filling. The results show that the use of composites containing a bronze-graphite filling improves the service life of lubricant-free friction couples that perform reciprocating motion.

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