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学术报告
2018-03-20 16:41:21 | 【 【打印】【关闭】

  SEMINAR 

  The State Key Lab of High Performance Ceramics and Superfine Microstructure 

  Structural Ceramics Engineering Research Center 

  中国科学院上海硅酸盐研究所 

  Lecture1  "Developments of impact-resistant ceramics based on boron carbide and other materials, including boron icosahedra as a structural element, at Frantsevich Institute of Problems in Materials Science, NAS of Ukraine. Past, Present and Future. " 

  SpeakerDr. Valerii Kartuzov 

  Institute for Problems in Materials Science, National Academy of Sciences of Ukraine 

    

  Lecture 2Computational experiment in the problem of penetration of high-speed projectiles into ceramic targets 

  SpeakerDr. Iegor Kartuzov 

   Institute for Problems in Materials Science, National Academy of Sciences of Ukraine 

    

  Lecture 3Aluminum dodecaboride and ceramics based on it 

  SpeakerOleksandr Vasiliev 

  Institute for Problems in Materials Science, National Academy of Sciences of Ukraine 

    

  时间:322日(周四)下午13:30 

  地点:长宁园区4号楼9楼会议室 

  联系人:张景贤研究员,江东亮院士 

  Lecture 1 

      Abstract Boron carbide as armor material started its’ history in the early 80s of the 19th century (~ 1981) and was for the first time employed in the bulletproof vests 6B4, which were designed specifically for Afghanistan war where they were successfully used and approbated. For this invention a team (which mainly involved specialists from IPMS NASU) was awarded by the State Prize of the Soviet Union (the highest governmental award). Since then, IPMS and other institutes of Ukraine and Russia have been actively involved in a comprehensive study of boron carbide and the related materials. These works were followed by the world scientific community and a large array of fundamental and applied knowledge was obtained in this direction. 

     At present, there is a new surge of interest paid to this class of ceramic materials with regard to the developed spectrum of new threats. IPMS NAS of Ukraine, being based on the existing experience of synergistic pooling of capabilities and efforts of specialists from different fields of activity and knowledge (technologists, physicists, chemists, mathematicians and computer scientists), and accounting for the existing military conflict in the country, has stepped up the development of a new class of impact-resistant ceramics. 

  Lecture 2 

  Abstract Ceramic materials are widely used in armor systems for the advantages of low density, high compressive strength and hardness. Ceramics response to projectile impact and other types of high-speed loading conditions is an important issue for its applications in armor. Ballistic performance of many types of ceramics was investigated in many experimental, theoretical and numerical studies. Due to complexity of the problem and interdisciplinary of the subject, most of the works in this field are experimental. The cost of experiment is a very high and the results obtained cannot be extrapolated to many ceramics and other armor materials. Due to advances of computer simulation, numerical analysis, analytical and molecular dynamic modeling become a very attractive and promising for research. Numerical models in this case should account for peculiar properties of dynamic fracture. Analytical simulation is based on integration of laws of mechanics of continuous media. Although analytical models are less accurate in prediction of actual ballistic behavior than numerical simulations, they allow the investigation of many parameters, due to their simplicity, that brings to a high reduction of time and cost of armor designing. Molecular dynamics (MD) simulation also becomes an increasingly useful tool to investigate some of the most fundamental aspects of dynamic fracture. Investigating rapidly propagating cracks using atomistic approach is particularly attractive. 

  IPMS team has gained about 20-year experience in modeling of hypervelocity impact and it helped in better understanding of mechanisms and phenomena involved and to resolve the faced problems while developing new ceramic impact resistant materials. 

  Lecture 3  

  Abstract    

  1. General properties of aluminum dodecaboride  

  An analysis of Al-B phase diagram. Aluminum dodecaboride as typical compound of icosahedral boron and expectations from it. Overview of the aluminum dodecaboride properties investigated until now.  

  2. Synthesis of aluminum dodecaboride  

  Existing methods of AlB12 synthesis. Synthesis from elemental reactants. Synthesis from compounds. Major shortcomings of existing methods.  

  3. Aluminum dodecaboride powders by the IPMS NAS of Ukraine method  

  General properties of AlB12 powders. Controlling the size of the particles.  

  4. Ceramics based on AlB12 

  Hot-pressing (and remarks on sintering) of single phase aluminum dodecaboride: properties and major issues. Composites with non-interacting components with AlB12-AlN as example. Composites with interacting components with AlB12-TiC as example.  

  5. Conclusions and insight into further developments  

  How the properties of AlB12 based ceramics can be improved. What else can be done with aluminum dodecaboride. 

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