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Effect of Microstructural Variables on the Erosion of Silicon Nitride Ceramics

机译：微观结构变量对氮化硅陶瓷腐蚀的影响

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摘要

Silicon nitride ceramics with three different microstructures were prepared using three different silicon nitride powders and β-silicon nitride whiskers in order to study their erosion characteristics. Samples with a coarse microstructure were prepared by using a commercially available silicon nitride powder seeded with the whiskers. Samples with fine microstructures were obtained using fine silicon nitride powders that had been milled in toluene or in distilled water. The powder milled in toluene gained both carbon and oxygen during milling. Heating the powder at 1673 K for 10 h in a flowing nitrogen atmosphere reduced carbon and oxygen contents to the level of as-received powder. The powder milled in distilled water gained a significant amount of oxygen during milling, and silicon oxynitride (Si_2N_2O) was detected by X-ray diffraction analysis (XRD) from the sample sintered with it. The sample sintered with the powder milled in distilled water showed the finest microstructure and the lowest erosion rate among the samples. Erosion occurred mainly by dislodgment of grains.
机译：使用三种不同的氮化硅粉末和β-氮化硅晶须制备了具有三种不同微观结构的氮化硅陶瓷，以研究其腐蚀特性。通过使用晶须晶种的市售氮化硅粉末制备具有粗微结构的样品。使用已在甲苯或蒸馏水中研磨的氮化硅细粉，可以获得具有微细结构的样品。在甲苯中研磨的粉末在研磨过程中同时获得了碳和氧。在流动的氮气气氛中将粉末于1673 K加热10小时，将碳和氧含量降低至所接收的粉末水平。在蒸馏水中研磨的粉末在研磨过程中获得了大量的氧气，通过X射线衍射分析（XRD）从与之烧结的样品中检测出氮氧化硅（Si_2N_2O）。用蒸馏水磨碎的粉末烧结的样品在样品中表现出最好的微观结构和最低的腐蚀速率。侵蚀主要是由于谷物的流失。

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