• 专利标题:   High thermal conductivity polyimide nano-friction material useful in ultrasonic motor rotor, comprises polyimide, graphene, multi-walled carbon nanotubes and nano-copper powder.
  • 专利号:   CN113402881-A
  • 发明人:   WANG G, CAO X, LI X, ZHAO G, SONG J, DING Q
  • 专利权人:   UNIV NANJING AERONAUTICS ASTRONAUTICS
  • 国际专利分类:   C08L079/08, C08K003/08, C08K003/04
  • 专利详细信息:   CN113402881-A 17 Sep 2021 C08L-079/08 202184 Pages: 7 Chinese
  • 申请详细信息:   CN113402881-A CN10571950 25 May 2021
  • 优先权号:   CN10571950

▎ 摘  要

NOVELTY - High thermal conductivity polyimide nano-friction material comprises 100 pts. wt. polyimide, 0.5-2 pts. wt. graphene, 0.5-1 pt. wt. multi-walled carbon nanotube and 0.1-1 pt. wt. nano-copper powder. USE - The high thermal conductivity polyimide nano-friction material is useful in ultrasonic motor rotor (claimed). ADVANTAGE - The composite material: has high thermal conductivity, thus has a low wear rate in a high-temperature environment, simple preparation method, convenient operation, low cost, and easy industrial large-scale preparation; is also easy to process into thin slices for use in rotary ultrasonic motors, which can increase the service life of the ultrasonic motor in a high-temperature environment. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing high thermal conductivity polyimide nano-friction material, comprising (i) ultrasonically dispersing graphene, multi-walled carbon nanotubes and nano-copper powder in acetone for 30 minutes, then adding polyimide powder, ball milling with a ball mill for 4 hours, (ii) drying in a vacuum drying oven at 80 degrees C, crushing and sieving to obtain mixed powder, (iii) hot pressing the mixed powder under the pressure of 10-20 MPa, maintaining the temperature at 375-390 degrees C for 1-2 hours, then cooling down with the furnace to obtain polyimide nano-friction material and (iv) slicing the polyimide nano-friction material produced in step (iii), pasting and surface treating.