Polytetrafluoroethylene friction material with high elastic modulus and preparation method and application thereof

A technology of polytetrafluoroethylene and friction materials, applied in the field of composite materials, can solve problems such as not being able to meet high elastic modulus

Active Publication Date: 2019-05-31
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The dynamic and static friction coefficients of polytetrafluoroethylene (PTFE) are close, the thermochemical properties are stable, and the advantages of easy processing just meet the requirements of friction materials for ultrasonic motors; however, since the elastic modulus of pure PTFE is only

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  • Polytetrafluoroethylene friction material with high elastic modulus and preparation method and application thereof
  • Polytetrafluoroethylene friction material with high elastic modulus and preparation method and application thereof
  • Polytetrafluoroethylene friction material with high elastic modulus and preparation method and application thereof

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preparation example Construction

[0036] The present invention provides a preparation method of the polytetrafluoroethylene friction material described in the above technical solution, comprising the following steps:

[0037] The polytetrafluoroethylene, mica, glass fiber, nano-alumina and graphite are mixed and pressed and sintered in sequence to obtain the polytetrafluoroethylene friction material.

[0038] The invention mixes polytetrafluoroethylene, mica, glass fiber, nano-alumina and graphite to obtain a mixture. In the present invention, there is no special limitation on the order and mixing method of each preparation raw material, as long as each component can be mixed evenly.

[0039] After the mixed material is obtained, the present invention compresses the mixed material to obtain a pressed material. In the present invention, the pressing pressure is preferably 70-100 MPa, more preferably 80-90 MPa; the time is preferably 3-5 minutes, more preferably 3-4 minutes. In the present invention, the press...

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Abstract

The invention relates to the technical field of composite materials, in particular to a polytetrafluoroethylene friction material with a high elastic modulus and a preparation method and application thereof. The provided polytetrafluoroethylene friction material with the high elastic modulus is prepared from, by mass, 55-70 parts of polytetrafluoroethylene, 15-35 parts of mica, 5-15 parts of glassfibers, 5-15 parts of nano alumina and 1-5 parts of graphite. The polytetrafluoroethylene friction material prepared from the raw materials in proportion has the advantages of great wear resistance,stable friction coefficient and the like on the basis of the high elastic modulus, and can meet the requirements of ultrasonic motors for friction materials.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a polytetrafluoroethylene friction material with high elastic modulus and its preparation method and application. Background technique [0002] Ultrasonic motor is a new concept of micro motor developed rapidly in the 1980s. It has the advantages of light weight, low speed, high torque, and fast response. In addition, it is free from electromagnetic interference. It has broad application prospects in high-tech fields such as instrumentation, robot joint drive, micro-mechanical technology, aerospace, and Mars probes. [0003] Since the ultrasonic motor transmits power through the friction interface, the friction characteristics of the interface are very important to the overall performance of the ultrasonic motor. Generally, the friction material is required to have: ① a suitable and stable friction coefficient (0.15-0.3), no creeping and crawling at low speeds ; ②Goo...

Claims

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Application Information

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IPC IPC(8): C08L27/18C08K13/04C08K7/14C08K3/22C08K3/34C08K3/04
Inventor 张新瑞王齐华王廷梅李宋
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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