Characterization of Zirconium Diboride for Thermal Protection Systems
Zirconium diboride, containing silicon carbide or molybdenum disilicide to form a passive oxide protective layer, was evaluated as a thermal barrier coating for space vehicles. Samples containing 0-30 vol% of SiC or MoSi2 were prepared by uniaxial hot pressing at 1900 C. The additions enhanced the strength, achieving a maximum of approximately 1 GPa at an addition of 30 vol%. An improvement in fracture toughness was also observed. The additions had the desired effect of enhancing the oxidation resistance, the composite containing 30 vol% MoSi2 having a weight gain of only 0.004 mg/mm2 on heating in air at 1500 C.
G. Hilmas et al., "Characterization of Zirconium Diboride for Thermal Protection Systems," Key Engineering Materials, Trans Tech Publications, Jan 2004.
Materials Science and Engineering
Keywords and Phrases
Fracture Toughness; Hot Pressing; Intermetallics; Molybdenum Disilicides; Oxidation Resistance; Space Vehicles; Thermal Barrier Coatings; Thermal Protection
Article - Conference proceedings
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