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Cahill, James

Du Frane, Wyatt

King, Gabriella

Kuntz, Josh

McCormack, Scott J.

Rivera, Jesus

Sobalvarro Converse, Elizabeth

Thorpe, Fox

English

Engineering Conferences International

FROM THE ATOMIC SCALE TO THE BULK: ULTRA HIGH TEMPERATURE EVALUATION OF METAL DIBORIDES MB2 (M = Ta, Ti, Hf, Zr, Nb)   Elizabeth Sobalvarro Converse, Lawrence Livermore National Laboratory, USA sobalvarro1@llnl.gov Fox Thorpe, University of California Davis, Department of Materials Science and Engineering, USA Jesus Rivera, Lawrence Livermore National Laboratory, USA Gabriella King, Lawrence Livermore National Laboratory, USA James Cahill, Lawrence Livermore National Laboratory, USA Scott J. McCormack, University of California Davis, Department of Materials Science and Engineering, USA Wyatt Du Frane, Lawrence Livermore National Laboratory, USA Josh Kuntz,  Lawrence Livermore National Laboratory, USA   Advancement of hypersonic vehicle technologies are severely limited due to the high heat flux generated by aerothermal effects. These high temperatures create environments which can affect or degrade even the most robust materials, leading to a reduction in system performance or even failure. The most promising candidates for these applications are Ultra-High Temperature Ceramics (UHTCs), including metal borides, carbides, and nitrides that have phase and thermal stability above 2000ᵒC. This work presents an in-depth materials study of UHTC metal diborides using in-situ and ex-situ characterization techniques that uncovers the thermochemical and thermophysical properties of these compounds. Spherical diboride beads were fabricated for in-situ high temperature X-ray experiments that utilizes gas levitation and a conical nozzle levitator system equipped with dual laser to heat small amounts of material up to 3000˚C. This in-depth thermally dependent phase exploration is paired with macroscale characterization (SEM, Oxy-acetylene torch testing, dilatometry, etc.) to compare the small-scale testing results and further understand the behavior of these materials at high temperatures. These experiments provide insight to the fundamental thermochemical and thermophysical material properties that are important for the engineering and design of future systems operating under extreme environments.    

From the atomic scale to the bulk: Ultra high temperature evaluation of metal diborides MB2 (M = Ta, Ti, Hf, Zr, Nb)

https://dc.engconfintl.org/cgi/viewcontent.cgi?filename=0&article=1015&context=uhtc_v&type=additional

From the atomic scale to the bulk: Ultra high temperature evaluation of metal diborides MB2 (M = Ta, Ti, Hf, Zr, Nb)

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Engineering Conferences International