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首页> 外文期刊>Journal of Materials Research >Effect of gravity on titanium carbide foams by self propagation high-temperature synthesis
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Effect of gravity on titanium carbide foams by self propagation high-temperature synthesis

机译：自蔓延高温合成对重力对碳化钛泡沫的影响

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摘要

Titanium carbide foams are synthesized by a self propagation high-temperature synthesis technique using carbon black, which generates gases during the synthesis. The synthesis is performed under terrestrial and microgravity conditions. The effects of gravity on the synthesis are evaluated in this study. The foaming is mainly caused by H2O and CO gases from the carbon black. The elongation of the products increases with decreasing environmental pressure and increasing amount of generated gases. Since the gas flows out along the direction of the combustion wave propagation, the products expand only along this direction. The propagation velocity of the combustion wave increases with increasing amount of generated gases and environmental pressure, which is due to the amount of molten Ti transporting into the reaction/preheat zone. Under higher environmental pressures, thermal convection of the environmental gases mainly affects the propagation velocity. However, at lower pressures, the behavior of the molten Ti has a great effect compared with the gases surrounding the specimens.
机译：碳化钛泡沫是使用碳黑通过自蔓延高温合成技术合成的，炭黑在合成过程中会产生气体。合成在地面和微重力条件下进行。在这项研究中评估了重力对合成的影响。发泡主要是由炭黑中的H2O和CO气体引起的。产品的伸长率随着环境压力的降低和所产生气体的数量的增加而增加。由于气体沿燃烧波传播的方向流出，因此产物仅沿该方向膨胀。燃烧波的传播速度随着产生的气体量和环境压力的增加而增加，这是由于熔融Ti输送到反应/预热区中的量所致。在较高的环境压力下，环境气体的热对流主要影响传播速度。但是，在较低的压力下，与样品周围的气体相比，熔融Ti的行为具有很大的影响。

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