文献类型：专利

英文题名：Preparation of large-size, high strength, and low heat conductivity carbon foam used as e.g. heat insulating material involves crushing asphalt structural material and carbon fiber reinforced material, adding ethanol, drying, and cooling

作者：CHEN R;HUO Y;LIU X;WANG Y;XU B;XU Y;ZHAN L;HE Z

机构：[1]UNIV EAST CHINA SCI & TECHNOLOGY

申请号：CN103910350-A

申请日：2014-03-17

公开日：2014-07-09

语种：英文

收录：DERWENT

摘要：NOVELTY - Preparation of large-size, high strength, and low heat conductivity carbon foam comprises taking high softening point asphalt spherical structural material and one-dimensional carbon fiber reinforced material; mechanically mixing raw materials; crushing, adding ethanol, and stirring; high temperature and high pressure drying and sealing; heating at 250-300 degrees C for 1-10 hours; heating to 500-700 degrees C for 2-10 hours; and heating to 800-1500 degrees C, and cooling to 30 degrees C. USE - Method for preparing large-size, high strength, and low thermal conductivity carbon foam (claimed) used as heat insulating material, structural insulating material, and wave-absorbing material for spaceflight, aviation, navigation and energy-saving building. ADVANTAGE - The carbon foam has diameter of 200 mm, height of 200 mm, heat conducting coefficient of less than 0.15 W/(m.K), compression strength of more than 30 MPa, volume shrinkage of less than 3% at 1500 degrees C, and density of 0.3-0.8 g/cm3. DETAILED DESCRIPTION - Preparation of large-size, high strength, and low thermal conductivity carbon foam comprises: (A) taking 1-41 wt.% 49-99% high softening point asphalt spherical structural material and 0-10 wt.% one-dimensional carbon fiber reinforced material; (B) mechanically mixing raw materials; (C) crushing to 3-10 mu m, adding 30-100% ethanol, and stirring; (D) high temperature and high pressure drying, where initial pressure is 2-10 MPa and sealing; (E) heating at 250-300 degrees C for 1-10 hours, where heating rate is 3-10 degrees C/minute; (F) heating to 500-700 degrees C for 2-10 hours, where heating rate is 0.1-2 degrees C/minute; and (G) heating to 800-1500 degrees C, where heating rate is 3-10 degrees C/minute, and cooling to 30 degrees C, where high softening point asphalt is coal-based high softening point asphalt and/or high softening point petroleum-based pitch having softening point of 200-280 degrees C, n-heptane solubles content of less than 1%, and toluene solubles content of less than 15%; spherical structural material is noncarbonized mesocarbon microsphere, nanosilica, activated carbon, carbonized material spherical activated carbon, spherical carbon airgel, spherical boron-based airgel, and/or zirconium-based inorganic material; and one-dimensional carbon fiber reinforced material is carbon fiber and/or silicon nanowire.