A metal-plastic composite stator of an ultrasonic motor and its preparation method
A composite stator, metal-plastic technology, applied in the direction of generator/motor, piezoelectric effect/electrostrictive or magnetostrictive motor, electrical components, etc. Production and other issues to achieve the effect of improving friction and wear performance, reducing weight, reducing material costs and processing costs
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[0039] A method for preparing a metal-plastic composite stator of an ultrasonic motor includes the following steps,
[0040] Step 1, mixing of powder: take by weight as follows:
[0041] Polymer matrix: 30%-80%; wherein, the polymer matrix is a mixture of one or more of polyphenylene sulfide, polytetrafluoroethylene, polyphenylene ester, and polyimide; the particle size of the polymer matrix is 400-1000 mesh;
[0042] Reinforcement fiber: 5%-30%; wherein, the reinforcement fiber is a mixture of one or more of carbon fiber, glass fiber, potassium carbonate whisker, and aramid fiber;
[0043] Friction and heat conduction improver: 5%-30%; wherein, the friction and heat conduction improver is one or a mixture of nano-copper powder, nano-diamond powder, nickel powder, and rare earth powder;
[0044] Put the polymer matrix, reinforcing fiber and frictional heat conduction improver in a high-speed mixer and mix 5 times, each time for 1-2 minutes; obtain mixed powder;
[0045] S...
Embodiment 1
[0051] Embodiment 1: Weigh the following by weight percentage: polytetrafluoroethylene 48%, polyphenylene sulfide 32%, copper powder 10%, carbon fiber 10%.
[0052] Specific steps are as follows:
[0053] 1) Weigh each component in proportion, and mix 5 times in a high-speed mixer, each time for 1 minute;
[0054] 2) Coat the mold with a release agent, then add the mixed powder into the mold, press and form at a pressure of 100Mpa, keep the pressure for 12 minutes, pressurize and sinter at a temperature of 380°C, and cool with the furnace;
[0055] 3) Carry out simple modification and bonding with the stator metal matrix;
[0056] The metal-plastic composite stator prepared in this example has a friction coefficient of 0.19, a preload force of 120N is applied, the rotational speed of the ultrasonic motor is 70r / min, and the stall torque is 0.6Nm. Reduced wear increases motor life.
Embodiment 2
[0057] Embodiment 2: Weigh the following by weight percentage: polytetrafluoroethylene 55%, polyphenylene sulfide 30%, copper powder 10%, carbon fiber 5%.
[0058] Specific steps are as follows:
[0059] 1) Weigh each component in proportion, and mix 5 times in a high-speed mixer, each time for 1 minute;
[0060] 2) Coat the mold with a release agent, then add the mixed powder into the mold, press and form at a pressure of 100Mpa, keep the pressure for 15 minutes, pressurize and sinter at a temperature of 370°C, and cool with the furnace;
[0061] 3) Carry out simple modification and bonding with the stator metal matrix;
[0062] The metal-plastic composite stator prepared in this example has a friction coefficient of 0.17, a preload force of 100N is applied, the rotational speed of the ultrasonic motor is 60r / min, and the stall torque is 0.5Nm.
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