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Porous oil-containing polyimide composite material for ultrasonic motor and preparation method thereof

A technology of polyimide and ultrasonic motor, which is applied in the field of porous oil-containing polyimide composite material and its preparation, polyimide composite material and its preparation, can solve the problem of shortening the service life of ultrasonic motor, failure to guarantee the operation of ultrasonic motor, friction Unstable performance and other problems, to achieve good continuous lubrication ability, stable friction coefficient and low wear rate

Inactive Publication Date: 2015-09-09
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the friction materials used in rotary ultrasonic motors mainly have two major problems: one is unstable friction performance, and the other is short service life.
However, the above-mentioned polymer composite materials have poor mechanical properties and high wear rate under dry friction conditions, which cannot guarantee the long-term stable operation of the ultrasonic motor, which greatly shortens the service life of the ultrasonic motor.

Method used

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  • Porous oil-containing polyimide composite material for ultrasonic motor and preparation method thereof
  • Porous oil-containing polyimide composite material for ultrasonic motor and preparation method thereof
  • Porous oil-containing polyimide composite material for ultrasonic motor and preparation method thereof

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Effect test

Embodiment 1

[0023] The percentage by weight of each component of the porous oil-containing polyimide composite material for an ultrasonic motor is as follows: 60% of polyimide, 20% of chopped carbon fiber, 15% of graphite, and 5% of silicon dioxide.

[0024] Concrete preparation steps:

[0025] 1. First mix polyimide, chopped carbon fiber, graphite and silicon dioxide thoroughly;

[0026] 2. Pour the uniformly mixed material into the mold for cold pressing to form, the pressure is 20MPa;

[0027] 3. Place the formed material in a high-temperature oven to raise the temperature to 370°C, sinter for 1 hour, and let it cool down naturally for demoulding;

[0028] 4. Place the obtained composite material in an environment of 120° C., vacuum-dry for 2 hours, immerse in lubricating oil for 60 hours to fully infiltrate the internal pores, and wipe off the lubricating oil adsorbed on the surface of the material with a cotton cloth to obtain a polyimide porous oil-containing lubricating material. ...

Embodiment 2

[0031] The percentage by weight of each component of the porous oil-containing polyimide composite material for an ultrasonic motor is as follows: 65% of polyimide, 15% of chopped carbon fiber, 15% of graphite, and 5% of silicon dioxide.

[0032] Concrete preparation steps:

[0033] 1. First mix polyimide, chopped carbon fiber, graphite and silicon dioxide thoroughly;

[0034] 2. Pour the uniformly mixed material into the mold for cold pressing to form at a pressure of 16MPa;

[0035] 3. Place the formed material in a high-temperature oven to raise the temperature to 375°C, sinter for 1 hour, and let it cool down naturally for demoulding;

[0036] 4. Place the obtained composite material in an environment of 115° C., vacuum dry for 2.5 hours, immerse in lubricating oil for 65 hours to fully infiltrate the internal pores, and wipe off the lubricating oil adsorbed on the surface of the material with a cotton cloth to obtain a polyimide porous oil-containing lubricating material...

Embodiment 3

[0039] The weight percent of each component of the porous oil-containing polyimide composite material for ultrasonic motor is as follows: polyimide 70%, chopped carbon fiber 10%, graphite 20%;

[0040] Concrete preparation steps:

[0041] 1. First mix polyimide, chopped carbon fiber and graphite thoroughly;

[0042] 2. Pour the uniformly mixed material into the mold for cold pressing, and the pressure is 10MPa;

[0043] 3. Place the formed material in a high-temperature oven to raise the temperature to 375°C, sinter for 1 hour, and let it cool down naturally for demoulding;

[0044] 4. Place the obtained composite material in an environment of 120° C., vacuum-dry it for 2 hours, immerse it in lubricating oil for 65 hours to fully infiltrate the internal pores, and wipe off the lubricating oil adsorbed on the surface of the material with a cotton cloth to obtain a polyimide porous oil-containing lubricating material.

[0045] The porosity of the polyimide composite material p...

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Abstract

The invention discloses a porous oil-containing polyimide composite material for an ultrasonic motor and belongs to the field of motor material preparation. The porous oil-containing polyimide composite material comprises, by mass, 60-80% of polyimide, 10-20% of carbon fibers and 10-20% of graphite. The porous oil-containing polyimide composite material has uniform aperture distribution, a stable friction coefficient, a very low wear rate and a good continuous lubrication capability, satisfies requirements on rotary ultrasonic motor stator and rotor friction, has a rated rotating speed greater than 80r / min, realizes long-term use of a rotary ultrasonic motor by a thin and uniform lubricating film formed on the contact surface and greatly prolongs a service life of the ultrasonic motor. The invention also provides a preparation method of the porous oil-containing polyimide composite material for an ultrasonic motor.

Description

technical field [0001] The invention relates to a polyimide composite material and a preparation method, in particular to a porous oil-containing polyimide composite material for an ultrasonic motor and a preparation method thereof, belonging to the field of motor material preparation. Background technique [0002] Ultrasonic motor is a new type of micro-motor developed rapidly in the 1980s and has special applications. 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. At present, the friction driving mode of the ultrasonic motor is dry friction between the stator and the rotor, and the wear of the material is inevitable. Due to the wear, the service life of the ultrasonic motor is shortened and the pre-pressure changes, which leads to the instability of the output speed of the ultrasonic motor. Therefore, seeking long-life and highly ...

Claims

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Application Information

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IPC IPC(8): C08L79/08C08K7/06C08K3/04C08K3/36C08J9/40C08J9/24
CPCC08K7/06C08J9/24C08J9/40C08J2379/08C08K3/04C08K3/36C08K2201/003C08K2201/004C08L79/08
Inventor 赵盖丁庆军
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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