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

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...

AI Technical Summary

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 about 500MPa, it must be modified to Meet the requirements for the use of friction materials for ultrasonic motors

The fillers of modified PTFE mainly include carbon fiber, graphene, copper powder, etc., which cannot meet the requirements of high elastic modulus for friction materials in ultrasonic motors

Images