Ultra-high-temperature ceramics (UHTCs), having extremely high melting points, are expected to be potential candidates as thermal protective materials for hypersonic aerospace vehicles and reusable atmospheric re-entry vehicles. Zirconium diboride (ZrB2) based composites, which are epresentative among UHTCs, possess a unique set of material properties, including unusually high thermal conductivity,good thermal shock resistance and modest thermal expansion coefficients. However, the difficulty in processing and unsatisfactory mechanical properties of UHTCs ceramics limits their further application. The combination of structural and surface demands like, outstanding strength and high oxidationresistance can often only be met economically via coatings.The application of UHTC protective coatings on the surface of lightweight fiber reinforced composites, such as C/SiC and C/C, is an effective way to resolve the application problems at high temperatures exceeding 1400 1C.
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