Polyvinylidene fluoride based composite frictional material for traveling wave type revolving ultrasonic motor and preparation method thereof

A composite friction material, polyvinylidene fluoride technology, applied in chemical instruments and methods, other chemical processes, etc., can solve problems such as difficulty in starting, poor heat resistance, etc.

Active Publication Date: 2012-08-15
NUAA SUPER CONTROL TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a polyvinylidene fluoride-based composite friction material for a traveling-wave rotary ultrasonic motor, which overcomes the problem of poor heat resistance of the existing polyvinylidene fluoride friction material, which leads to difficulty in starting

Method used

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  • Polyvinylidene fluoride based composite frictional material for traveling wave type revolving ultrasonic motor and preparation method thereof
  • Polyvinylidene fluoride based composite frictional material for traveling wave type revolving ultrasonic motor and preparation method thereof
  • Polyvinylidene fluoride based composite frictional material for traveling wave type revolving ultrasonic motor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A polyvinylidene fluoride-based composite friction material for a traveling-wave rotary ultrasonic motor, comprising the following components in parts by weight: 100 parts of PVDF, 20 parts of polytetrafluoroethylene, a material for adjusting friction and thermal conductivity, and 20 parts of polyphenylene resin , 10 parts of copper gold powder.

[0022] A method for preparing a polyvinylidene fluoride-based composite friction material for a traveling-wave rotary ultrasonic motor, the steps are as follows:

[0023] a) PVDF resin, polyphenylene ester, copper-gold powder, and polytetrafluoroethylene were premixed in a ball mill for 20 minutes in proportion, then wet mixed with ethanol for 3 hours, and dried at 80°C;

[0024] b) Put the above-mentioned pellets into the mold cavity, hydraulically form, press 35MPa, keep the pressure for 15min; demould, sinter at 220-250°C for 2h, and cool with the furnace.

[0025] c) Processing to the required size, ready for use.

Embodiment 2

[0027] A polyvinylidene fluoride-based composite friction material for a traveling-wave rotary ultrasonic motor, comprising the following components in parts by weight: 100 parts of PVDF, 30 parts of reinforcing fiber carbon fiber, and 1.0 part of silane coupling agent KH-550.

[0028] A method for preparing a polyvinylidene fluoride-based composite friction material for a traveling-wave rotary ultrasonic motor, the steps are as follows:

[0029] a) PVDF resin, carbon fiber, and coupling agent are premixed in a ball mill for 20 minutes in proportion, then wet mixed with ethanol for 3 hours, and dried at 80°C;

[0030] b) Put the above-mentioned pellets into the mold cavity, hydraulically form, press 35MPa, keep the pressure for 15min; demould, sinter at 220-250°C for 2h, and cool with the furnace;

[0031] c) Processing to the required size, ready for use.

Embodiment 3

[0033] A polyvinylidene fluoride-based composite friction material for a traveling-wave rotary ultrasonic motor, comprising the following components in parts by weight: 100 parts of PVDF, and 30 parts of aluminum oxide as a reinforcing filler.

[0034] A method for preparing a polyvinylidene fluoride-based composite friction material for a traveling-wave rotary ultrasonic motor, the steps are as follows:

[0035] a) PVDF resin and alumina are pre-mixed in a ball mill for 20 minutes in proportion, then wet-mixed with ethanol for 3 hours, and dried at 80°C;

[0036] b) Put the above-mentioned pellets into the mold cavity, hydraulically form, press 35MPa, keep the pressure for 15min; demould, sinter at 220-250°C for 2h, and cool with the furnace;

[0037] c) Processing to the required size, ready for use.

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Abstract

The invention relates to a polyvinylidene fluoride based composite frictional material for a traveling wave type revolving ultrasonic motor and a preparation method thereof. The frictional material comprises the following compositions in parts by weight: 100 parts of polyvinylidene fluoride, 0-30 parts of reinforced fibers, 0-30 parts of reinforced filler and 0-50 parts of friction and heat-conducting property conditioning agent. The the preparation method comprises the steps of: premixing the compositions weighed in a proportion for 20 minutes in a ball mill; mixing for 3-5 hours by adopting an ethanol wet method; drying at temperature of 80 DEG C; adding granules into a mold cavity, and conducting hydraulic forming under the conditions that pressure is 25-40MPa and is maintained for 5-15 munites; demoulding, sintering for 1.5-2.5 hours at the temperature of 220-250 DEG C, and cooling along with a furnace; and machining to a needed dimension. The obtained frictional material can increase the mechanical characteristic and the service life of the ultrasonic motor.

Description

technical field [0001] The invention relates to a polyvinylidene fluoride (PVDF)-based composite friction material, which can be applied to the driving surface layer of a traveling wave ultrasonic motor rotor or a stator, and improves the mechanical characteristics and stable operation life of the motor. The invention also relates to a preparation method of polyvinylidene fluoride (PVDF)-based composite friction material. Background technique [0002] Traveling wave rotary ultrasonic motor (TRUM) uses the inverse piezoelectric effect of piezoelectric ceramics to excite the vibration of the elastic body to realize the conversion of electrical energy to mechanical energy; move. Among them, the friction material is one of the core components of the ultrasonic motor, and its performance directly affects the mechanical characteristics and service life of the ultrasonic motor. [0003] The friction materials of traveling wave rotary ultrasonic motors can be summarized into: resi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/16C08L77/10C08L9/02C08L67/03C08L27/18C08K9/06C08K7/14C08K7/06C08K3/04C08K7/08C08K3/08C08K3/30C09K3/14
Inventor 丁庆军刘传会胡家玲赵淳生
Owner NUAA SUPER CONTROL TECHNOLOGY CO LTD
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