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Multidimensional synergistic modified polyimide composite material for ultrasonic motor and preparation method of composite material

A polyimide and ultrasonic motor technology, applied in the field of polymer composite materials, can solve the problems of short service life and unstable friction performance, and achieve the effects of improved temperature resistance and wear resistance, low cost and convenient manufacturing

Inactive Publication Date: 2019-04-26
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of unstable friction performance and short service life of friction materials for ultrasonic motors, and to invent a multi-dimensional synergistically modified polyimide composite material with stable friction performance and good wear resistance and its preparation method

Method used

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  • Multidimensional synergistic modified polyimide composite material for ultrasonic motor and preparation method of composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The mass parts of each component of a multi-dimensional synergistically modified polyimide composite material for an ultrasonic motor are as follows: polyimide 100, hydroxylated fullerene 0.1, multi-wall carbon nanotube 0.1, graphene oxide 0.1.

[0029] Concrete preparation steps:

[0030] 1. First disperse polyimide molding powder, hydroxylated fullerene, multi-walled carbon nanotubes, and graphene oxide powder in ethanol, and mechanically stir in an ultrasonic water bath for 4 hours to ensure that the filler and the polymer matrix are fully mixed and evenly , and then dried, crushed and sieved (200 mesh);

[0031] 2. Put the mixed molding material into the mold for hot pressing and sintering molding. The molding temperature is 360°C, the pressure is 10MPa, the holding time is 60 minutes, and then the mold is naturally cooled and demolded;

[0032] 3. Cut the polyimide composite material into slices with a thickness of 0.25 mm. After pasting it with the aluminum alloy...

Embodiment 2

[0035] A multi-dimensional synergistically modified polyimide composite material for an ultrasonic motor, the mass parts of each component are as follows: polyimide 100, fullerene 0.3, multi-wall carbon nanotube 0.5, graphene oxide 0.3.

[0036] Concrete preparation steps:

[0037] 1. Disperse polyimide molding powder, hydroxylated fullerene, multi-walled carbon nanotubes, and graphene oxide powder in ethanol, and mechanically stir in an ultrasonic water bath for 5 hours to ensure that the filler and the polymer matrix are fully mixed and evenly , and then dried, crushed and sieved (200 mesh);

[0038] 2. Add the mixed mold material into the mold for hot pressing and sintering molding. The molding temperature is 365°C, the pressure is 10MPa, the holding time is 65 minutes, and then the mold is naturally cooled and demolded;

[0039] 3. Cut the polyimide composite material into slices with a thickness of 0.25 mm. After pasting it with the aluminum alloy rotor, polish the surfa...

Embodiment 3

[0042] A multi-dimensional synergistically modified polyimide composite material for an ultrasonic motor, the mass parts of each component are as follows: polyimide 100, hydroxylated fullerene 0.5, multi-walled carbon nanotube 1, graphene oxide 0.5.

[0043] Concrete preparation steps:

[0044] 1. First disperse polyimide molding powder, hydroxylated fullerene, multi-walled carbon nanotubes, and graphene oxide powder in ethanol, and mechanically stir in an ultrasonic water bath for 6 hours to ensure that the filler and the polymer matrix are fully mixed and evenly , and then dried, crushed and sieved (200 mesh);

[0045] 2. Add the mixed mold material into the mold for hot pressing and sintering molding. The molding temperature is 370°C, the pressure is 15MPa, the holding time is 70 minutes, and then the mold is naturally cooled and demolded;

[0046]3. Cut the polyimide composite material into slices with a thickness of 0.25 mm. After pasting it with the aluminum alloy rotor...

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Abstract

The invention discloses a multidimensional synergistic modified polyimide composite material for an ultrasonic motor. The multidimensional synergistic modified polyimide composite material is characterized by mainly comprising the following materials in parts by mass: 100 parts of polyimide, 0.1-1 part of hydroxylated fullerene, 0.1-3 parts of multiwalled carbon nanotubes and 0.1-1 part of graphene oxide. A preparation method comprises the following steps: mixing the composite powder uniformly, then adding into a mold for hot-pressing molding at a molding temperature of 360-380 DEG C and a pressure of 10-20 MPa, keeping the temperature and the pressure for 60-90 min, and then naturally cooling and demolding. The composite material provided by the invention has relatively high mechanical properties, stable friction coefficient and extremely low wear rate, and can greatly improve bearing capacity, operating stability and service life of the ultrasonic motor.

Description

technical field [0001] The invention belongs to the field of polymer composite materials, in particular to a composite material used in ultrasonic motors, in particular to a multi-dimensional synergistically modified polyimide composite material for ultrasonic motors and a preparation method thereof. Background technique [0002] With the continuous development of ultrasonic motor technology and the expansion of application scope, the requirements for the performance of rotor friction materials are getting higher and higher. Traditional PTFE-based composite materials are very difficult due to their shortcomings such as low mechanical strength, low hardness, and short service life. It is difficult to meet the high output stability and long service life of ultrasonic motors. Therefore, the development of new friction materials is crucial for the rapid development of ultrasonic motors. [0003] At present, the friction materials used in rotary ultrasonic motors mainly have two...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08K3/04C08K9/00
CPCC08K3/041C08K3/042C08K3/045C08K9/00C08L79/08
Inventor 赵盖宋敬伏丁庆军裘进浩
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS