• 专利标题:   Preparing graphene heat-dissipation composite material by mixing graphite powder and nano-silicon dioxide, adding to absolute ethanol solution, dispersing and mixing, heat-preserving, starting to release pressure, performing supercooling treatment, freeze-drying, sheet forming, heating and sintering.
  • 专利号:   CN113150748-A, CN113150748-B
  • 发明人:   WANG Z, YIN J, WANG H
  • 专利权人:   UNIV HEILONGJIANG SCI TECHNOLOGY
  • 国际专利分类:   C09K005/14, C01B032/194, C01B032/19
  • 专利详细信息:   CN113150748-A 23 Jul 2021 C09K-005/14 202174 Pages: 14 Chinese
  • 申请详细信息:   CN113150748-A CN10541307 18 May 2021
  • 优先权号:   CN10541307

▎ 摘  要

NOVELTY - Method for preparing graphene heat-dissipation composite material, involves (i) mixing graphite powder with nano-silicon dioxide, adding to a absolute ethanol solution, and dispersing and mixing using a high-speed dispersing machine to obtain a composite slurry, where the graphite powder is natural graphite powder or expanded graphite powder, (ii) placing composite slurry in a reaction kettle, heat-preserving at stirring speed of 300-500 rpm, 150-400 degrees C and pressure of 40-55 MPa for 0.5-2 hours, starting to release the pressure until the pressure is 5-30 MPa, and closing pressure valve to obtain a composite material with high temperature and high pressure reaction, (iii) taking out composite material that reacts under high temperature and high pressure, performing supercooling treatment, freeze-drying, and sheet forming to obtain a formed composite material, and (iv) placing formed composite material in a hot-pressing sintering furnace for heating and pressure sintering. USE - The method is used for preparing graphene heat-dissipation composite material.