Effect of different rigid reinforcing fillers on properties of PTFE

doi:10.19491/j.issn.1001-9278.2023.08.003

Abstract

Abstract:

Five types of polytetrafluoroethylene （PTFE）⁃based composites with carbon fiber （CF）， wollastonite fiber （WF）， polyimide （PI）， polyoxybenzoyl （POB） and copper powder （Cu） at a volume fraction of 25 vol% were prepared. The effects of different fillers on the mechanical properties， creep properties， thermal conductivity and tribological performance of the composites were comparatively investigated. The micro⁃morphology of the worn surface of the composites was analyzed， and their wear⁃resistant mechanism was discussed. The results indicated that the hardness and compressive strength of PTFE were significantly enhanced by the five types of rigid fillers， its creep was reduced， and its thermal conductance was improved. However， the tensile strength and elongation at break of PTFE were greatly reduced. The CF⁃modified PTFE composite exhibited the highest tensile and compressive strength and the best creep resistance. Meanwhile， the Cu⁃modified PTFE composite presented the highest hardness and the best thermal conductance. The modified PTFE obtained a considerably improvement in wear resistance due to the enrichment of the rigid fillers at the wear scar interface. The three types of inorganic fillers increased the friction coefficient of PTFE， whereas the two types of polymer fillers， PI and POB， reduced its friction coefficient slightly. The POB⁃modified PTFE composite presented the best tribological performance with a friction coefficient of only 0.19 and a volume wear rate of around 4.21×10^-6 mm³/（N·m）. Its wear resistance was 260 times higher than that of pure PTFE.

Key words: polytetrafluoroethylene, filler modification, reinforcing fiber, tribological performance, mechanical property

CLC Number:

TQ325.4

LI Hongbo, YANG Rui, SU Zhengtao. Effect of different rigid reinforcing fillers on properties of PTFE[J]. China Plastics, 2023, 37(8): 13-19.

Figures/Tables 9

Fig.1. Micromorphology of the fillers

Fig.2. Effect of different fillers on tensile strength and elongation at break of PTFE

Fig.3. Tensile fracture morphology of neat PTFE and those filled with different fillers

材料	1 %压缩强度/MPa	5 %压缩强度/MPa	10 %压缩强度/MPa	硬度/度
PTFE	2.66	10.51	13.87	57
PTFE/Cu	8.06	18.22	21.84	73
PTFE/POB	3.86	13.21	15.34	59
PTFE/PI	4.99	14.58	18.69	63
PTFE/CF	8.78	18.88	22.05	70
PTFE/WF	8.47	15.95	16.44	67

Tab.1. Compressive strength and hardness of PTFE filled with different fillers

温度/℃	30		150
性能	蠕变变形/%	全变形/%	蠕变变形/%	全变形/%
PTFE	6.09	12.21	21.77	29.07
PTFE/Cu	2.50	5.77	15.50	22.63
PTFE/PI	2.28	5.95	14.41	21.24
PTFE/POB	3.34	7.09	20.82	28.26
PTFE/CF	1.74	5.43	7.97	14.51
PTFE/WF	2.52	6.10	14.64	22.45

Tab.2. Creep properties of PTFE filled with different fillers

Fig.4. Effect of reinforcing fillers on the thermal conductivity of PTFE

Fig.5. Effect of different fillers on friction factor and volume wear rate of PTFE

Fig.6. Micromorphology of worn surfaces of the friction samples

Fig.7. Schematic diagram of fiber enrichment process on PTFE wear mark surfaces

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