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Dense Powder Beds for Powder-based Additive Manufacturing of Ceramics
2017-09-08 16:23:54 | 编辑: | 【 【打印】【关闭】

  SEMINAR
The State Key Lab of
High Performance Ceramics and Superfine Microstructure
Shanghai Institute of Ceramics, Chinese Academy of Sciences

  中 国 科 学 院 上 海 硅 酸 盐 研 究 所 高 性 能 陶 瓷 和 超 微 结 构 国 家 重 点 实 验 室

  1、Dense Powder Beds for Powder-based Additive Manufacturing of Ceramics

  Professor J. Günster (BAM Bundesanstalt für Materialforschung Germany)

  2、R&D Activities for AM and 3D Printing in Xi’an Jiaotong University

  田小永 教授 西安交通大学机械工程学院)

  时间:2015年10月23日(星期五)上午10: 00

  地点: 4号楼5楼会议室

  欢迎广大科研人员和研究生参与讨论!

  联系人:曾宇平(5203)

  报告摘要及报告人简介:

  1、Dense powder beds for powder-based additive manufacturing of ceramics

  Many of the most successful and precise additive manufacturing (AM) technologies are based on the deposition layer-by-layer of a flowable powder. Since the first pioneering patents for powder based AM (“Three-dimensional printing techniques” by Sachs et al., filed in 1989, and Deckard’s “Method and apparatus for producing parts by selective sintering”, filed in 1986) many developments have been introduced, greatly extending the use of different materials, improving the physical properties of the components built and enhancing the accuracy of the process. Still very important issues remain nowadays, hampering a completely autonomous production of parts and even restricting the freedom of design by means of these technologies. One of the major issues is the low density and stability of the parts during the building process, which implies the need of support structures in most of the AM technologies: The powder bed surrounding the part has an essential role, since it should support the structure during building, until it’s ready for removal. Nonetheless, the deposition of new layers generates lateral forces often resulting in a displacement of the part built. Therefore, support structures are normally built along with the part to prevent this shifting, even though they would not be strictly necessary. It is clear that the buildup of these support structures consumes processing time and material, while their removal requires an additional process step. On the other hand, in a completely autonomous process, stability and quality of the parts built must be assured, while the manual removal of support structures in an additional finishing process is not acceptable. Three approaches for the stabilization and densification of powder beds will be presented: The Layerwise Slurry Deposition process LSD, the application of a gas flow though the powder bed and the Selective Volume Sintering of ceramic powder compacts.

  CV:Jens Günster is head of division "Ceramic Processing and Biomaterials" at the Federal Institute for Materials Research and Testing (BAM) in Berlin and a professor at Clausthal University of Technology. He graduated from Clausthal University of Technology with adegree in physics 1995.He has worked as an Alexander von Humboldt Fellow with Ryutaro Souda at NIMS in Tsukuba, Japan, and as a postdoctoral fellow with Wayne D. Goodman at Texas A&M, USA. As a research assistant of Jürgen G. Heinrich he received his VeniaLegendi in Materials Physics from Clausthal University of Technologyin 2002 and joined 2003 the International Center for Young Scientists ICYS at NIMS as visiting member. From 2008 to 2010 he worked as laser and glass specialist for Oerlikon Solar in Switzerland.He is board member of the German Ceramic Society (DKG) and Associate Editor of the Journal of Ceramic Science and Technology.His current research interests include functional materials, laser processing and additive manufacturing of ceramics.

  2、R&D activities for AM and 3D printing in Xi’an Jiaotong University

  Additive manufacturing technology has been developed in Xi’an Jiaotong University for almost twenty years. Up to now, it is still attracting the attentions of the researchers or manufacturers all over the world. Some innovative processes and frontier application research are all being conducted here to catch up the development tread of this technology. In this talk, newly developed processes, such as UV-LED Stereolithography, Ceramic Stereolithography, and Direct Metal Forming, will be described. Some results of the frontier application researches, such as Indirect Fabrication of Ceramic Casting Mould, Wind-Tunnel-Testing Models, and Photonic Crystals and Metamaterials, will be also briefly reviewed.

  田小永,博士,1981年出生,西安交通大学副教授。2010年毕业于德国克劳斯塔尔工业大学,获工学博士学位,2011年1月任职于西安交通大学机械工程学院。主要研究方向为3D打印(增材制造)技术、光子晶体与超材料。主持863重大项目1项、国家自然科学基金2项、省部级项目3项,参与国家自然科学基金重点项目1项、“973”项目1项,发表论文30余篇,SCI收录18篇,撰写书籍章节、专著各1部,申请发明专利20件,授权4件,参加国际会议并做学术报告10余次。担任国际期刊《Progress in Additive Manufacturing》(Springer)编委,ISO TC261 (增材制造) WG 2/4 委员。详见:http://gr.xjtu.edu.cn/web/leoxyt

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