{"65658":{"#nid":"65658","#data":{"type":"event","title":"MSE Ph.D. Proposal - Gregg Van Laningham","body":[{"value":"\u003Cp\u003E\u003Cstrong\u003ETitle\u003C\/strong\u003E: Oxidation Resistance, Electrical and Thermal Conductivity, and Spectral  Emittance of Fully Dense HfB2 and ZrB2 with SiC, TaSi2, and TaB2 Additives\u003Cbr \/\u003E\n  \u003Cstrong\u003EAbstract\u003C\/strong\u003E:\u003Cbr \/\u003E\n  The proposed research will  investigate material properties of ZrB2 and HfB2-based com-\u003Cbr \/\u003E\n  pounds pertaining to their ability  to resist oxidation and dissipate heat at elevated tempera-\u003Cbr \/\u003E\n  tures. Additives will be  investigated for their beneficial oxidation-resistant effects. Materials\u003Cbr \/\u003E\n  which are able to function at  extreme temperatures in oxidizing environments are candidates\u003Cbr \/\u003E\n  for components of advanced air- and  spacecraft. Current research in these materials, termed\u003Cbr \/\u003E\n  Ultra High Temperature Ceramics (UHTCs),  lacks a profundity of data pertaining to tem-\u003Cbr \/\u003E\n  peratures above 1500 deg.C. In  particular, experiments concerning oxidation behavior and heat\u003Cbr \/\u003E\n  dissipation are needed.\u003C\/p\u003E\n\u003Cp\u003ESpecifically, the proposed research  will utilize \u003Cem\u003Ein situ\u003C\/em\u003E thermogravimetric analysis of a\u003Cbr \/\u003E\n  spectrum of compositions of ZrB2 and  HfB2-based compounds with additives of SiC, TaSi2,\u003Cbr \/\u003E\n  and TaB2. The former is known to  produce a protective silicate glass layer (up to ~ 1500 deg.C), and the latter have been shown by  some to confer oxidation resistance at higher temperatures.\u003Cbr \/\u003E\n  A labratory balance mounted on a  lifting table beneath a furnace with Zircothal heating\u003Cbr \/\u003E\n  elements able to reach 2000 deg.C is  used to perform the oxidation studies.\u003Cbr \/\u003E\n  In addition to the oxidation  studies, characterization of the materials\u0027 ability to dissipate\u003Cbr \/\u003E\n  excess heat will be performed. The  thermal expansion of the samples will be determined with\u003Cbr \/\u003E\n  a graphite differential dilatometer,  the thermal diffusivity is determined by the laser flash\u003Cbr \/\u003E\n  method, and these values will be  used to calculate the thermal conductivity. As the materials\u0026nbsp;\u003Cbr \/\u003E\n  will be expected to not only  conduct\u0026nbsp;heat but radiate it away also, the spectral emittance of each sample will be determined  using\u0026nbsp;a spectral radiometer.\u003C\/p\u003E\n\u003Cp\u003EThis research will contribute to the  understanding and modeling suitability of a class\u003Cbr \/\u003E\n  of materials expected to find use in  the next generation of supersonic aircraft and reusable\u003Cbr \/\u003E\n  spacecraft. In addition, it will  contribute to the science of UHTC materials and offer new\u003Cbr \/\u003E\n  understanding as to the mechanics of  oxidation resistance at high temperatures.\u003C\/p\u003E","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003EMSE Ph.D. Proposal - Gregg Van Laningham\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ETitle\u003C\/strong\u003E: Oxidation Resistance, Electrical and Thermal Conductivity,\n and Spectral  Emittance of Fully Dense HfB2 and ZrB2 with SiC, TaSi2, \nand TaB2 Additives\u003C\/p\u003E","format":"limited_html"}],"field_summary_sentence":[{"value":"MSE Ph.D. Proposal - Gregg Van Laningham"}],"uid":"27388","created_gmt":"2011-04-19 10:42:21","changed_gmt":"2016-10-08 01:54:50","author":"Bill Miller","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2011-05-02T15:00:00-04:00","event_time_end":"2011-05-02T17:00:00-04:00","event_time_end_last":"2011-05-02T17:00:00-04:00","gmt_time_start":"2011-05-02 19:00:00","gmt_time_end":"2011-05-02 21:00:00","gmt_time_end_last":"2011-05-02 21:00:00","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":[{"id":"1795","name":"Seminar\/Lecture\/Colloquium"}],"invited_audience":[],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}