报告内容摘要：

In the past fifteen years, we have been continuously developing multifunctional structural carbon foams from mesophase pitch and bituminous coal with properties of lightweight, high porosity and mechanics, Controllable thermal and electrical conductivity, corrosion and flame resistance, acoustic and vibrational energy absorption, etc. By correlating charactors of the raw materials with properties of two kinds of the carbon foams, we tried to elaborate performance origins of the carbon foams. During foaming of raw materials, the mesophase pitch and bituminous coal, with behaviors like a mixture of macromolecule polymers, both become viscous fluid firstly at high temperature, and with increasing temperature, small molecules decomposed from macromolecules begin to take effect on foaming under pressure, and thus the polymerized macromolecule is converted into coke-like green foams. With further carbonization and/or graphitization, the mesophase pitch-based graphite foams and coal-based carbon foams are obtained from the coke-like green foams respectively. Unlike the non-graphitized hard carbon materials from resins, the carbon materials from mesophase pitch and bituminous coal, called graphitized carbons, both have the same structure model with the basic unit as graphite microcrystallites. The graphite crystallites size and crystalline degree will increase with the increasing temperature of heat treatment, which grants the materials special thermal and electrical conductivity and mechanical performance.
Furthermore, macromolecules of mesophase pitches are layered aromatic macromolecule with highly ordered structure, exhibiting some properties of liquid crystals. Such properties guarantee the graphite microcrystallites to grow adequately and gradually approach  the state of perfect graphite under condition of graphitization temperature above 2800℃. The macromolecules in coal are cross-linked extensively in the presence of some heteroatoms like oxygen and nitrogen, which would restrict the growth of graphite crystallites even under the graphitization temperature above 2800℃. Therefore, in comparison with graphitized coal-based carbon foam and traditional resin-based carbon foam, the graphitized carbon foams from mesophase pitch have the highest thermal conductivity and are a kind of soft carbons, while the coal-based carbon foams with lower thermal conductivity are kinds of carbon materials between soft carbons like graphite and hard carbons like resin-based carbons.
Finally, applications of the mesophase pitch-based and coal-based carbon foams in military are reviewed. The multifunction feature makes them ideal military materials, providing unique solutions to many problems and provoking innovations and developments of new concepts and practices in functional device designs for military equipments.
 
报告人简历：

Dr. Kai Li is an Assistant Professor in the Department of Protection, Research Institute of Chemical defense, a military academy. He completed his bachelor study at National University of Defense Technology in 1998, and Master and Doctor studies at Research Institute of Chemical defense (1998-2006). His current research focuses are on industrialization and application developments of mesophase pitch-based and the coal-based carbon foams. The carbon foams, developed by Dr. Li and his co-workers, have been used broadly in military functional devices since 2009.
李凯博士是防化研究院第一研究所副研究员，1998年在国防科技大学获得学士学位，2001年和2016年在防化研究院获得工学硕士和博士学位，长期从事碳基和硅基多孔材料研究工作。目前正在推动中间相沥青基和煤基炭泡沫材料的产业化和武器装备应用开发。李凯博士及其团队开发的炭泡沫材料已经在多种军用功能器件上获得应用。
 
欢迎广大师生参加！