Abdullah Al Saad

BARD Materials · Technical Service Department

A new method has been proposed to evaluate the quality metric of ready-mix concrete also applicable in pre-cast concrete industry.

Carbon-carbon (C/C) composites require protective coatings for prolonged use in elevated temperature, oxidizing environments. Ceramic coatings can provide oxidation protection; however, thermal expansion mismatch in conjunction with thermal events and interfacial constraint during coating deposition can result in residual stress, which can affect t...

To protect carbon/carbon (C/C) composites from severe oxidation and ablation at temperatures exceeding 500 ℃ during the hypersonic applications, a novel Sm2O3-stabilized ZrO2 coating is applied using atmospheric plasma spray. The surface was pre-treated with an oxyacetylene flame to increase the surface roughness and, therefore, to create geometric...

Emissivity as a function of wavelength, direction, and temperature correlates to a material's efficiency in radiating thermal energy. Knowledge of emissivity is essential for designing and developing radiation‐cooled thermal protective systems for hypersonic applications. It is desirable to achieve a high emissivity (with a value close to 1) to max...

During a high-speed flight, the leading edges of hypersonic vehicles can experience enormous heat fluxes, with surface temperatures greater than 1600℃ expected. While carbon/carbon (C/C) is a candidate material for leading edges and other hot structures, it is prone to oxidation and increasing ablation damage above 500℃. Ablation-resistant coatings...

During a high-speed flight, the leading edges of hypersonic vehicles can experience enormous heat fluxes, with surface temperatures greater than 1600℃ expected. While carbon/carbon (C/C) is a candidate material for leading edges and other hot structures, it is prone to oxidation and increasing ablation damage above 500℃. Oxidation-resistant coating...

Emissivity as a function of wavelength, direction, and temperature correlates to a material's efficiency in radiating thermal energy. It is desirable to achieve a high emissivity with a value close to 1 to maximize heat radiation from a hot surface of a hypersonic vehicle's leading edge during atmospheric re-entry. Knowledge of emissivity is essent...

A substantial amount of energy is transferred to the leading edge during hypersonic flight, with typical surface temperatures greater than 1800oC measured. Using radiation as a means to cool the surface can significantly reduce surface temperature, with the most relevant property being emissivity. In the work reported here, cubic zirconia with diff...