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首页> 外文期刊>Journal of Ceramic Processing Research. (Text in English) >Mechanical and thermal behaviors of silica-based porous ceramics by addition of silicon carbide
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Mechanical and thermal behaviors of silica-based porous ceramics by addition of silicon carbide

机译：添加碳化硅的二氧化硅基多孔陶瓷的力学和热行为

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摘要

The mechanical and thermal behaviors of porous silica-based ceramic cores for preformation of internal cooling passages in gas turbine blades were studied. The silica-based ceramic cores are composed of fused silica and zircon powders, and silicon carbide powder (SiC) was added to improve the mechanical and thermal properties of the silica-based ceramic cores. Cristobalite, which was formed by crystallization of amorphous silica on SiC surface, improved the flexural strength, bulk density and thermal conductivity of silica-based ceramic cores up to an addition of 10 wt% SiC. The SiC on the silica-based ceramic cores enhanced the thermal conductivity, because SiC has higher thermal conductivity compared with matrix materials of ceramic cores (fused silica and zircon). However, in case of 20 wt% SiC on ceramic core, the crystallization of fused silica was accelerated due to SiC addition which acts as a seed of crystallization, therefore, many microcracks were generated by phase transformation (beta ->alpha) of cristobalite. As a result, the flexural strength, relative density and thermal conductivity of the ceramic core with 20 wt% SiC were reduced.
机译：研究了用于形成燃气轮机叶片内部冷却通道的多孔二氧化硅基陶瓷芯的力学和热行为。二氧化硅基陶瓷芯由熔融二氧化硅和锆石粉组成，并且添加了碳化硅粉（SiC）以改善二氧化硅基陶瓷芯的机械性能和热性能。通过在SiC表面上无定形二氧化硅结晶而形成的方石英，提高了二氧化硅基陶瓷芯的抗弯强度，堆积密度和导热性，最多添加了10 wt％SiC。二氧化硅基陶瓷芯上的SiC增强了导热性，因为与陶瓷芯的基体材料（熔融石英和锆石）相比，SiC具有更高的导热性。然而，在陶瓷芯上20wt％的SiC的情况下，由于作为结晶的种子的SiC的添加，熔融二氧化硅的结晶加速，因此，通过方石英的相变（β-＞α）产生许多微裂纹。结果，具有20wt％的SiC的陶瓷芯的弯曲强度，相对密度和导热率降低。

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