نتایج جستجو برای: ultra high temperature ceramics uhtcs
تعداد نتایج: 2425766 فیلتر نتایج به سال:
Porous ultra-high-temperature ceramics (UHTCs) are a candidate group of materials for transpiration cooling hypersonic vehicles due to their exceptionally high melting point, typically above 3000 K. Their operating temperature permits higher amount radiative than that achievable with conventional materials, which reduces the required coolant mass flow rate cool surface. This work experimentally...
The ablation and oxidation of ZrB₂-based ultra high temperature ceramic (UHTC) composites containing 10%, 15% and 30% v/v SiC were tested under different heat fluxes in a high frequency plasma wind tunnel. Performance was significantly affected by the surface temperature, which was strongly dependent on the composition. Composites containing 10% SiC showed the highest surface temperature (>2300...
Ultrahigh temperature ceramics (UHTCs) such as diborides of zirconium, hafnium tantalum and their composites are considered to be the candidate materials for thermal protection systems of hypersonic vehicles due to their exceptional combination of physical, chemical and mechanical properties. A composite of ZrB2-TiB2 is expected to have better properties. In this study, an attempt has been made...
Ultra-high temperature ceramics are desirable for applications in the hypersonic vehicle, rockets, re-entry spacecraft and defence sectors, but few materials can currently satisfy the associated high temperature ablation requirements. Here we design and fabricate a carbide (Zr0.8Ti0.2C0.74B0.26) coating by reactive melt infiltration and pack cementation onto a C/C composite. It displays superio...
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