High Temperature Tribological Properties of Thermosetting Polyimide

DUAN Chunjian; Cui Yu; WANG Chao; TAO Liming; WANG Qihua; Xie Hai; WANG Tingmei

doi:10.16078/j.tribology.2017.06.002

TRIBOLOGY > 2017 > 37(6): 717-724. > DOI: 10.16078/j.tribology.2017.06.002 CSTR: 32261.14.j.tribology.2017.06.002

DUAN Chunjian, Cui Yu, WANG Chao, TAO Liming, WANG Qihua, Xie Hai, WANG Tingmei. High Temperature Tribological Properties of Thermosetting Polyimide[J]. TRIBOLOGY, 2017, 37(6): 717-724. DOI: 10.16078/j.tribology.2017.06.002

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High Temperature Tribological Properties of Thermosetting Polyimide

1.
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Gansu Lanzhou 730000, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
Technology Center, AECC Xi'an Engine Control Technology Co Ltd, Shaanxi Xi'an 710077, China

Funds: The project was supported by the National Natural Science Foundation of China (U1630128) and the National Key Research and Development Plan (2016YFF0101000)

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Corresponding author:
WANG Tingmei, E-mail: wangtin3088@sina.com, Tel: +86-931-4968252
Received Date: August 14, 2017
Revised Date: September 07, 2017
Accepted Date: September 27, 2017
Available Online: November 05, 2017
Published Date: November 27, 2017

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Abstract

Abstract

Thermosetting polyimide oligomers with different diamines (isomers) was synthesized with 3,3’, 4,4’-biphenyltetracarboxylic dianhydride (s-BPDA), 4,4’-diaminodiphenyl ether (4,4’-ODA), 3,4’-diaminodiphenyl ether (3,4’-ODA) and 4-phenylethynylphthalide (4-PEPA). Furthermore, dry sliding tests were performed at 25 ℃, 100 ℃, 200 ℃, 250 ℃, 300 ℃ and 350 ℃ on a ball-on-disk wear tester. Mechanisms of friction and wear were studied in detail by scanning electron microscope and energy dispersive X-ray spectroscopy. At elevated temperature, experimental results demonstrated that the wear rate increased first, then decreased and finally increased. However, average coefficient of friction showed a tendency to plummet with temperature range from 25 ℃ to 350 ℃. This trend was attributed to changes in the mechanical properties of the polymer surface. The wear mechanisms at elevated temperatures were different. At 25 and 100 ℃, fatigue wear and abrasive wear prevailed. From 100 ℃ to 200 ℃, a dense of transfer film generated and the thickness increased due to adequate shearing motion of molecular chain. Hence, mild abrasive wear played a major role. Above 250 ℃, wear rate rapidly increased with damage of interaction between the molecular chain and polyimide was peeled on worn surface under the lasted load, adhesive wear was dominant. As a general guideline, higher ambient temperature rendered a greater wear rate.
- thermosetting polyimide,
- high temperature,
- friction and wear mechanism

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References

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