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PPS (polyphenylene sulfide) and nano Al2O3 filled PTFE (polytetrafluoroethylene) composite material

A technology of polytetrafluoroethylene and composite materials, which is applied in the field of powder metallurgy materials, can solve the problems of low lubricating surface energy, large linear expansion coefficient, poor wear resistance, etc., and achieve the reduction of wear degree, inhibition of fibrosis, transfer film smooth effect

Inactive Publication Date: 2018-06-01
刘芳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

PTFE has good lubricity, extremely low surface energy, and excellent high and low temperature resistance and chemical corrosion resistance, but there are also some defects, such as poor wear resistance, large linear expansion coefficient, easy creep, and easy cold flow Wait

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0012] Polyphenylene sulfide and nano-Al 2 o 3 The raw materials for the preparation of filled polytetrafluoroethylene composite materials include: polytetrafluoroethylene (PTFE): grade POLYLON M-18F, with an apparent density of about 0.47g / ml and an average particle size of 38μm, produced by Daikin Corporation of Japan; polystyrene Sulfide (PPS): grade P0833A, density 2.12g / cm 3 , produced by Polyplastics Corporation of Japan; nano-aluminum oxide (Nano-Al 2 o 3 ): average particle size 50-100nm, specific surface area 180m 2 / g, produced by Zhejiang Hongsheng Material Technology Co., Ltd. Polyphenylene sulfide and nano-Al 2 o 3 The preparation steps of the filled polytetrafluoroethylene composite material are as follows: PTFE, PPS, Nano-Al 2 o 3 Mix uniformly in a high-speed mechanical blender according to a certain proportion, cold press molding at 45MPa, and sinter in a sintering furnace for 6 hours with a certain procedure after demoulding, cool to room temperature ...

Embodiment example 2

[0014] With the increase of PPS content, the hardness of the composite material gradually increases, and the hardness improvement effect is most obvious when the filling is 5%. With nano Al 2 o 3 As the content increases, the hardness of the composite material also shows a trend of increasing gradually. Because PPS and nano Al 2 o 3 The hardness and modulus are higher than PTFE, so the hardness of the composite material is improved. The increase in the hardness of the composite material helps to improve the shear resistance and creep resistance of the composite material. With the increase of PPS content, the friction coefficient showed a trend of decreasing first and then increasing. For the pure PTFE material without PPS, its friction coefficient is 0.275; when the mass fraction of PPS is 5%, the friction coefficient decreases to 0.23; with the further increase of PPS content, the friction coefficient of the composite material gradually increases, when PPS When the mass...

Embodiment example 3

[0016] With nano Al 2 o 3 As the content increases, the friction coefficient of the composite material increases gradually. When nano-Al 2 o 3 After the mass fraction exceeds 2%, the friction coefficient is basically stable between 0.28-0.285. The volumetric wear rate showed a trend of first increasing and then decreasing. Nano-Al 2 o 3 The presence of PPS improves the hardness, compressive strength, modulus and creep resistance of the composite material, makes up for the lack of PPS bearing capacity, and strengthens the matrix area in the composite material that cannot be filled by PPS. When Nano Al 2 o 3 After the mass fraction of PTFE increases to 2%, the increase in the hard phase in the PTFE matrix hinders the slippage of the PTFE macromolecular chain, thereby improving the wear resistance. When Al 2 o3 When the mass fraction is 5%, the wear resistance is the best, which is 276 times higher than that of pure PTFE, and 152 times higher than that of PPS / PTFE compos...

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Abstract

The invention provides a PPS (polyphenylene sulfide) and nano Al2O3 filled PTFE (polytetrafluoroethylene) composite material. PPS and nano Al2O3 filled PTFE composite material samples are prepared with a method comprising steps of mechanical blending, cold press molding and sintering; frictional wear performance of the samples under the dry friction condition is tested by an MRH3 type ring-block tester; an SEM (scanning electron microscope) is adopted for observing and analyzing morphology of the wear surface and the transfer membrane surface of each sample. When the mass fraction of PPS is 5%, the friction coefficient and volume abrasion rate of the PPS / PTFE composite material both reach the minimum value; with addition of nano Al2O3, the tribological property of the PPS / PTFE composite material is further improved, when the mass fraction of nano Al2O3 is 5%, the volume abrasion rate of the nano Al2O3 / PPS / PTFE composite material is the minimum, and wear resistance is increased by 276 times as compared with that of pure PTFE. The main wear mechanism of PTFE / PPS / PTFE and the nano Al2O3 / PPS / PTFE composite material is adhesion wear at the room temperature, and the nano Al2O3 / PPS / PTFE composite material is accompanied with abrasive wear at 150 DEG C.

Description

technical field [0001] The invention relates to a powder metallurgy material, in particular to a polyphenylene sulfide and nano-Al 2 o 3 Filled PTFE composite. Background technique [0002] The Stirling engine is an externally heated, closed-circuit regenerative cycle heat engine using high-pressure hydrogen or helium as the working fluid. Its power performance and reliability are closely related to dynamic sealing technology. Generally, dynamic sealing materials are required to have excellent self-lubrication, that is, a small friction coefficient, and excellent wear resistance, heat resistance and dimensional stability. Polytetrafluoroethylene (PTFE) is the best base material for Stirling dynamic seals. PTFE has good lubricity, extremely low surface energy, and excellent high and low temperature resistance and chemical corrosion resistance, but there are also some defects, such as poor wear resistance, large linear expansion coefficient, easy creep, and easy cold flow ...

Claims

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Application Information

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IPC IPC(8): C08L27/18C08L81/02C08K3/22
CPCC08L27/18C08K2201/011C08L2201/08C08L81/02C08K2003/2227
Inventor 刘芳
Owner 刘芳
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