RTB1-Computational-Experimental Reactive Wetting of Hf-Ti-Me Alloy Melts with B4C
Abstract
This proposal request funds to investigate the processing of Hf-Ti-Nb alloy melts with B4C to form boride-carbide precipitates in a Hf-Ti-Nb alloy matrix. Although the ultimate goal of the research endeavor is to enhance significantly the oxidation resistance of ultrahigh temperature ceramic composites (UHTCC), the processing of these reactive metals must be improved dramatically to control the eventual development of the oxide scale. • Investigate the use of surface tensions of liquid Hf-Ti-Nb alloys to predict their infusioninto a B4C packed bed by computational fluid dynamics at 2800 K (2527°C);• Investigate the effect of the temperature gradient on the fluid dynamics, as well as thestable and metastable phases within the boride-carbide/Hf alloy composite.• Investigate the reaction path of (Hf-Ti-Nb)Liq/B4C through the microstructures formed attemperatures greater than 2800 K (2527°C) toward controlling the precipitation.The surface tension of the alloy melt will be linked to the depth of melt penetration and the segregation of the alloying elements (i.e., Hf, Ti and Nb) within the pores. The segregation can then be exploited to place elements for developing a protective oxidizing scale as the composite oxidizes
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Sep 11, 2017
- Source ID
- FA95501710393
Entities
People
- Arturo Bronson
Organizations
- Air Force Office of Scientific Research
- United States Air Force
- University of Texas at El Paso