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.
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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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