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Graphdiyne modified polyimide ultrasonic motor friction material and preparation method thereof

A polyimide, ultrasonic motor technology, applied in the field of polymer composite materials, can solve the problems of high surface free energy, short service life, poor creep resistance, etc., to improve mechanical strength, improve wear resistance, mechanical The effect of improved performance

Inactive Publication Date: 2021-10-08
南京市擘星精密科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the friction materials used in rotary ultrasonic motors mainly have the following problems: first, high surface free energy, second, poor creep resistance, and third, short service life
At present, there is no domestic friction material that can completely solve the above three problems and meet the needs of ultrasonic motors at the same time.

Method used

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  • Graphdiyne modified polyimide ultrasonic motor friction material and preparation method thereof
  • Graphdiyne modified polyimide ultrasonic motor friction material and preparation method thereof
  • Graphdiyne modified polyimide ultrasonic motor friction material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The parts by mass of the components of the graphyne-modified polyimide composite material for ultrasonic motors are as follows: 100 g of polyimide, 1 g of graphyne, 1 g of carbon nanotubes, and 1 g of aluminum oxide.

[0028] Concrete preparation steps:

[0029] 1) adding polyimide, graphyne, carbon nanotubes, and alumina powder into alcohol for ball milling for 4 hours, mixing thoroughly, and then drying, pulverizing, and sieving;

[0030] 2) Pour the mixed molding material into the mold for hot pressing and sintering molding. The molding temperature is 375°C, the pressure is 20MPa, and the mold is demoulded by natural cooling;

[0031] 3) Slicing the polyimide composite material, pasting it with the aluminum alloy rotor and surface treatment for the ultrasonic motor.

[0032] The compressive strength 5% of the polyimide composite material prepared in this example is 14.3MPa, the contact angle is 118°, the friction coefficient with the phosphor bronze stator pair is 0...

Embodiment 2

[0034] The parts by mass of the components of the graphyne-modified polyimide composite material for ultrasonic motors are as follows: 100 g of polyimide, 2 g of graphyne, 2 g of carbon nanotubes, and 2 g of aluminum oxide.

[0035] Concrete preparation steps:

[0036] 1) adding polyimide, graphyne, carbon nanotubes, and alumina powder into alcohol for ball milling for 5 hours, fully mixing, and then drying, pulverizing and sieving;

[0037] 2) Pour the mixed molding material into the mold for hot pressing and sintering molding. The molding temperature is 375°C, the pressure is 20MPa, and the mold is demoulded by natural cooling;

[0038] 3) Slicing the polyimide composite material, pasting it with the aluminum alloy rotor and surface treatment for the ultrasonic motor.

[0039] The compressive strength 5% of the polyimide composite material prepared in this example is 14.9MPa, the contact angle is 120°, the friction coefficient with the phosphor bronze stator pair is 0.169 u...

Embodiment 3

[0041] The parts by mass of the components of the graphyne-modified polyimide composite material for ultrasonic motors are as follows: 100 g of polyimide, 3 g of graphyne, 3 g of carbon nanotubes, and 3 g of aluminum oxide.

[0042] Concrete preparation steps:

[0043] 1) adding polyimide, graphyne, carbon nanotubes, and alumina powder into alcohol for ball milling for 6 hours, fully mixing, and then drying, pulverizing, and sieving;

[0044] 2) Pour the mixed molding material into the mold for hot pressing and sintering molding. The molding temperature is 375°C, the pressure is 20MPa, and the mold is demoulded by natural cooling;

[0045] 3) Slicing the polyimide composite material, pasting it with the aluminum alloy rotor and surface treatment for the ultrasonic motor.

[0046] The compressive strength 5% of the polyimide composite material prepared in this example is 15.7MPa, the contact angle is 123°, the friction coefficient with the phosphor bronze stator pair is 0.164 ...

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Abstract

The invention discloses a graphdiyne modified polyimide ultrasonic motor friction material and a preparation method thereof, and belongs to the field of polymer composite materials. The composite material is prepared from the following raw materials in parts by weight: 100 parts of polyimide, 1-5 parts of graphdiyne, 1-5 parts of carbon nanotubes and 1-5 parts of aluminum oxide. The preparation method comprises the steps of: well mixing composite powder, pouring the mixed powder into a mold, carrying out hot press molding at the mold pressing temperature of 360-380 DEG C under the pressure of 10-20 MPa, and naturally cooling and demolding. According to the invention, graphdiyne is utilized to improve the strength and wear resistance of the composite material and reduce the surface free energy, and then carbon nanotubes and aluminum oxide are utilized to synergistically modify and improve the mechanical properties and tribological properties of the composite material, so that the novel composite material has the characteristics of high strength, stable friction coefficient and low wear. According to the invention, adhesion wear caused by long-time operation of the friction interface of an ultrasonic motor can be reduced, the material can be easily processed into a sheet and used in a rotary ultrasonic motor, and the storage stability, speed stability and service life of the ultrasonic motor are greatly improved.

Description

technical field [0001] The invention belongs to the field of polymer composite materials, and in particular relates to a graphyne-modified polyimide ultrasonic motor friction material and a preparation method. Background technique [0002] The ultrasonic motor is a new type of motor that uses the inverse piezoelectric effect to transfer the microscopic vibration of the stator to the output of the rotor through friction. It has the advantages of light weight, high positioning accuracy, good electromagnetic compatibility, power-off self-locking, structure With the advantages of strong designability, it is an ideal choice for performance improvement and replacement of high-end equipment actuation systems. With the continuous development of ultrasonic motor technology and the rapid expansion of application fields, the requirements for the operation stability and service life of ultrasonic motors are getting higher and higher. Traditional friction materials are difficult to meet ...

Claims

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Application Information

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IPC IPC(8): C08L79/08C08K3/04C08K3/22
CPCC08K3/04C08K3/041C08K3/22C08K2003/2227C08L79/08
Inventor 汪国庆赵盖曹鑫鑫李兴明宋敬伏丁庆军汤辰悦鞠沅良
Owner 南京市擘星精密科技有限公司
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