A kind of friction material for piezoelectric motor and its preparation method and application

Abstract

The invention discloses a friction material used for a piezoelectric motor and a preparation method and an application thereof. The friction material comprises the following raw materials: polytetrafluoroethylene, polyether-ether-ketone, polybenzoate, carbon fiber, and glass fiber, wherein the feeding mass ratio of polytetrafluoroethylene to polyether-ether-ketone to polybenzoate to carbon fiber to glass fiber is 4-11: 0.5-3:1:0.5-4:0.5-3; The preparation method comprises the following steps: 1) mixing the raw materials according to a formula amount, drying a mixture, and crushing the mixture;2) performing cold press molding on the processed mixture obtained in the step 1), and demoulding to obtain a friction material prefabricated product; and 3) performing sintering molding on the prefabricated product to obtain the friction material. The invention also provides an application of the friction material in the piezoelectric motor. The friction material can achieve excellent effects onfriction coefficient and hardness, can improve the easy tooth trapping and starting difficulty of the friction material, and increases the stalling torque of the friction material.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to materials for piezoelectric motors, in particular to a friction material for piezoelectric motors and a preparation method and application thereof. Background technique [0002] Piezoelectric motor is a new type of micro motor developed in the 1980s. It has the advantages of compact structure, low speed and high torque, no electromagnetic interference, and high control precision, so it has great advantages in the field of precision control. The piezoelectric motor is mainly composed of stator, piezoelectric ceramics, rotor, friction material, etc. The inverse piezoelectric effect of piezoelectric ceramics is used to make the stator generate ultrasonic vibration, and the driving force is generated through the friction between the stator and rotor. Therefore, the friction material is The core component of the piezoelectric motor, its performance directly det...

AI Technical Summary

Problems solved by technology

[0003] With the continuous development of piezoelectric motor technology, the performance requirements for rotor friction materials are constantly increasing. The performance of existing friction materials is different, which basically meets the requirements of piezoelectric motors for friction materials, but there are still some defects: 1. Low stall torque leads to weak load capacity; 2. The hardness is not high enough, resulting in long-term storage of friction materials that are easy to trap teeth and difficult to start

Although this patent achieves better hardness to a certain extent, it is still difficult to meet the increasingly high standards. At the same time, it is also difficult to achieve a better increase in the stall torque of the piezoelectric motor.