Friction and wear behavior of PI and PTFE composites for ultrasonic motors

2018 ◽  
Vol 29 (5) ◽  
pp. 1487-1496 ◽  
Author(s):  
Gai Zhao ◽  
Chuhan Wu ◽  
Liangchi Zhang ◽  
Jingfu Song ◽  
Qingjun Ding
Keyword(s):  
Friction And Wear ◽  
Wear Behavior ◽  
Friction And Wear Behavior ◽  
Ultrasonic Motors ◽  
Ptfe Composites

Friction and Wear of Bronze Filled PTFE and Graphite Filled PTFE in 40 MPA Hydrogen Gas

2011 ◽  
Author(s):  
Yoshinori Sawae ◽  
Eiichi Miyakoshi ◽  
Shunichiro Doi ◽  
Hideki Watanabe ◽  
Yoshie Kurono ◽  
...  
Keyword(s):  
High Pressure ◽  
Stainless Steel ◽  
Friction And Wear ◽  
Wear Behavior ◽  
Hydrogen Gas ◽  
Friction And Wear Behavior ◽  
Comparison Results ◽  
Gas Environment ◽  
Ptfe Composites ◽  
Pressure Hydrogen

Several kinds of Polytetrafluoroethylene (PTFE) composites are currently being used in reciprocating hydrogen gas compressors as seal material which should articulate against metal counterfaces in pressurized hydrogen gas. Although their friction and wear behavior has large impact on the efficiency and reliability of gas compressors, available information about tribological characteristics of PTFE composites in high pressure hydrogen gas is quite limited. In this study, friction and wear of graphite filled PTFE and bronze filled PTFE were evaluated in the 40 MPa hydrogen gas environment by using a pin-on-disk type apparatus enclosed in a high pressure vessel to supply experimental data for the design of gas compressors in hydrogen fuelling stations. AISI316L austenitic stainless steel disk was used as a sliding counterface. All experiments were conducted under dry condition with the average contact pressure of 1.8 MPa, the sliding speed of 100 mm/s and the gas temperature of 327 K. The friction force exerted between PTFE composites and stainless steel was evaluated by a load cell during the experiment and the wear rate of composites was evaluated from the weight loss of pin specimens. In addition, chemical analysis of the polymer transfer film formed on the disk surface were conducted by using X-ray photoelectron spectrometer. Friction and wear tests were also conducted in 40 MPa helium gas for comparison. Results indicated that bronze filled PTFE was more sensitive to the gas pressure and gas species; it showed good friction and wear behavior in high pressure hydrogen, although friction in high pressure helium became very high. On the other hand, the effects of high pressure gas environment were relatively small for the friction and wear of graphite filled PTFE.

Properties of POB reinforced PTFE-based friction material for ultrasonic motors

2017 ◽  
Vol 37 (7) ◽  
pp. 681-687 ◽  
Author(s):  
Qingjun Ding ◽  
Yudan Zhang ◽  
Gai Zhao ◽  
Feng Wang
Keyword(s):  
Friction And Wear ◽  
Adhesion Force ◽  
Wear Behavior ◽  
Friction Material ◽  
Friction And Wear Behavior ◽  
Mechanical And Tribological Properties ◽  
Ultrasonic Motors ◽  
The Coefficient Of Friction ◽  
Scanning Electron ◽  
Ball On Disc

Abstract Polytetrafluoroethylene (PTFE) and its composite coating with various poly-p-oxybenzoyl (POB) proportions was prepared by spray suspensions. The friction and wear behavior were evaluated against a GCr15 steel ball on a ball-on-disc tribometer under dry sliding. The effect of the content of POB on the hydrophobic, mechanical and tribological properties of the PTFE-based coatings and the performances of the corresponding ultrasonic motors (USMs) were studied. Experimental results showed that the optimal content of POB not only increased the hardness, adhesion force and contact angle (CA), but also increased the coefficient of friction and wear resistance of the PTFE coatings. Especially, the wear rate of PTFE coating filled with 15 wt.% POB (3.42×10−4 mm3/N·m) was only a quarter of pure PTFE. The morphologies of the worn surfaces of the PTFE coatings were observed by scanning electron microscopy to discuss the wear mechanism. The mechanical output properties of USMs were the best with filling of 10 wt.% POB into PTFE matrix.

Friction and Wear Behavior of Copper‐graphite Composites with Different Compositions in Water Environments

2021 ◽  
Vol 6 (6) ◽  
pp. 1288-1296
Author(s):  
Hongming Wie ◽  
Jianpeng Zou ◽  
Xiaoya Li ◽  
Cong Xiao
Keyword(s):  
Friction And Wear ◽  
Wear Behavior ◽  
Friction And Wear Behavior ◽  
Graphite Composites
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