{"62939":{"#nid":"62939","#data":{"type":"event","title":"David Lipke - PhD Proposal Defense","body":[{"value":"\u003Cp align=\u0022center\u0022\u003E\u003Cstrong\u003ENovel Reaction Processing\nTechniques for the Fabrication of Ultra-High Temperature Metal\/Ceramic\nComposites with Tailorable Microstructures\u003C\/strong\u003E\u003C\/p\u003E\n\n\u003Cp\u003EUltra-high temperature (i.e., \u0026gt; 2500\u00b0C)\nengineering applications present continued materials challenges. Refractory\nmetal\/ceramic composites have great potential to satisfy the demands of extreme\nenvironments (e.g., the environment experienced in solid rocket motors upon\nignition), though general scalable processing techniques to fabricate complex\nshaped parts are lacking. The work embodied in this dissertation advances\nscientific knowledge in the development of processing techniques to form\ncomplex, near net-shape, near net-dimension, near fully-dense refractory\nmetal\/ceramic composites with controlled phase contents and microstructures.\u003C\/p\u003E\n\n\u003Cp\u003EThree research thrusts will be detailed in this presentation. First, the\nutilization of rapid prototyping techniques, such as computer numerical\ncontrolled machining and three dimensional printing, for the fabrication of\nporous tungsten carbide preforms and their application with the Displacive\nCompensation of Porosity process (a solid-volume-increasing reactive\ninfiltration technique) to produce tungsten\/zirconium carbide-bearing\ncomposites is demonstrated. Second, carbon substrates and preforms have been\nreactively converted to porous metal\/metal carbide replicas via a novel\ngas-solid displacement reaction. Lastly, a reaction-based process for\nsynthesizing refractory metal\/ceramic micro\/nanocomposites will be discussed.\nThese novel reaction processing techniques combined have the potential to\nproduce micro\/nanostructured refractory metal\/ceramic composite materials with\ntailorable microstructures for ultra-high temperature applications.\u003C\/p\u003E","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003EMSE Ph.D. Defense - David Lipke \u003C\/p\u003E\u003Cp\u003EWednesday, December 8\u003Csup\u003Eth\u003C\/sup\u003E, 2010 - 11 AM \u003C\/p\u003E","format":"limited_html"}],"field_summary_sentence":[{"value":"MSE Ph.D. Defense - David Lipke"}],"uid":"27388","created_gmt":"2010-11-23 12:47:49","changed_gmt":"2016-10-08 01:53:32","author":"Bill Miller","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2010-12-08T10:00:00-05:00","event_time_end":"2010-12-08T13:00:00-05:00","event_time_end_last":"2010-12-08T13:00:00-05:00","gmt_time_start":"2010-12-08 15:00:00","gmt_time_end":"2010-12-08 18:00:00","gmt_time_end_last":"2010-12-08 18:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"groups":[{"id":"1238","name":"School of Materials Science and Engineering"}],"categories":[],"keywords":[{"id":"10802","name":"MSE_Interal_Event"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[],"invited_audience":[],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}