A high thermal conductivity insulating polytetrafluoroethylene friction material and its preparation method and application

Abstract

The invention relates to the technical field of composite materials and in particular relates to a high heat conduction insulating polytetrafluoroethylene friction material as well as a preparation method and application thereof. The high heat conduction insulating polytetrafluoroethylene friction material provided by the invention comprises the following preparation raw materials in parts by mass: 50-80 parts of polytetrafluoroethylene, 5-20 parts of polyimide, 5-20 parts of mica, 5-15 parts of nanometer aluminum oxide and 1-10 parts of nano aluminum nitride. The polytetrafluoroethylene friction material prepared from the raw materials in a ratio has the characteristics of being stable in wearing resistance, stable in friction coefficient, and the like on the basis of high heat conductionand high insulation properties, and requirements of ultrasonic motors on friction materials can be met.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a high thermal conductivity and insulating polytetrafluoroethylene friction material 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...

AI Technical Summary

Problems solved by technology

[0004] Polytetrafluoroethylene (PTFE) has close dynamic and static friction coefficients, stable thermochemical properties, and easy processing, which just meet the requirements of friction materials for ultrasonic motors; but pure PTFE has low hardness, poor wear resistance, and low mechanical strength. Under the action of external force, it will produce large viscoelastic deformation, easy to creep, etc., and must be modified to meet the requirements 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 insulation for friction materials in ultrasonic motors

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