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首页> 外文期刊>CERAMICS INTERNATIONAL >Low temperature synthesis of pure phase TaB2 powders and its oxidation protection modification behaviors for Si-based ceramic coating in dynamic oxidation environments
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Low temperature synthesis of pure phase TaB2 powders and its oxidation protection modification behaviors for Si-based ceramic coating in dynamic oxidation environments

机译：纯相位蛋白粉末的低温合成及其在动态氧化环境中Si基陶瓷涂层的氧化保护修饰行为

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摘要

To reveal the generation mechanisms of the Ta-Si-O glass ceramics layer in dynamic oxidation environments, a 40 wt% TaB2-SiC coating was prepared by liquid phase sintering method. To obtain pure phase TaB2 powders at lower temperature (1500 degrees C), excessive B2O3 powders were added in raw materials to eliminate the TaC by-product phase. The hexagonal pure phase TaB2 powders own average particle size of about 386 nm. During the TGA dynamic oxidation tests, after the modification of 40 wt% TaB2, the initial weight loss temperature of the sample delayed by about 48%, while the weight loss percentage and rate in fastest weight loss zone decreased by about 61% and 53%, respectively. During oxidation, the generated Ta-oxides were peeled and carried away by the formed fluid SiO2 glass layer to form "Ta-oxides halation" at first, which results the dissolution of Ta-oxides in the SiO2 glass, thus forming the Ta-Si-O glass ceramics with dendritic structure. With the spread of the SiO2 glass layer and growth of the Ta-Si-O dendrite, the Ta-Si-O glass ceramics gradually cover on the surface of the SiO2 glass layer, forming the structure of Ta-Si-O/SiO2 double glass layer that is capable of sealing and arresting of microcracks.
机译：为了揭示动态氧化环境中的TA-Si-O玻璃陶瓷层的产生机制，通过液相烧结方法制备40wt％的凸片2-SiC涂层。为了在较低温度（1500℃）下获得纯相标签2粉末，在原料中加入过量的B2O3粉末以消除TAC副产物的液相。六边形纯相位蛋白粉末粉末自身为约386nm的平均粒度。在TGA动态氧化试验期间，在改变40wt％Tab2之后，样品的初始重量损失温度延迟约48％，而重量损失百分比和最快减肥区的速率降低约61％和53％ ， 分别。在氧化过程中，由所形成的流体SiO 2玻璃层剥离产生的Ta氧化物，以形成“TA氧化物清零”，从而形成SiO 2玻璃中的Ta氧化物，从而形成Ta-Si -O玻璃陶瓷，具有树突结构。随着SiO2玻璃层的扩散和TA-Si-O树枝状的生长，TA-Si-O玻璃陶瓷逐渐覆盖SiO2玻璃层的表面，形成Ta-Si-O / SiO2的结构能够密封和阻止微裂纹的玻璃层。

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