Изготовление деталей двигателей автомобилей из Si3N4-керамики с добавкой MgO‒Al2O3 методом горячего прессования


https://doi.org/10.17073/1683-4518-2020-7-36-44

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Аннотация

Сделана попытка оптимизации керамического материала с целью придания ему улучшенных характеристик. Исследуется проблема технологии изготовления плотных керамических композитов на основе Si3N4 методом горячего прессования. Керамический материал состоит из эквимолекулярной смеси α- и β-Si3N4 с добавкой разных количеств MgO‒Al2O3-шпинели в качестве спекающей добавки. Исследованы плотность, твердость, вязкость разрушения, пределы прочности при изгибе и сжатии при комнатной температуре полученной керамики с учетом ее микроструктуры. Результаты показали, что равномерно плотную структуру Si3N4-керамики можно получить при введении в ее состав добавок разных количеств магнезиально-алюминатной шпинели. Кроме того, было обнаружено, что MgO‒Al2O3-смесь внедряется в структуру Si3N4-керамики, благодаря чему ускоряется рост зерен, увеличивается количество удлиненных зерен β-Si3N4 и оптимизируется соотношение их геометрических размеров. В результате увеличения доли MgO относительно Al2O3 в структуре шпинели улучшаются свойства нитридной керамики. Установлено, что горячепрессованная Si3N4-керамика с вкраплениями частиц β-Si3N4 может успешно применяться для изготовления деталей автомобильных двигателей.

Об авторах

М. А. А. Аттия
Хелуанский университет, отделение машиностроения, инженерный факультет в Хелуане,
Россия
Мохамед А. А. Аттия


Э. М. М. Эвайс
Центральный металлургический научно-исследовательский институт (CMRDI), отделение огнеупорных и керамических материалов (RCMD)
Россия
Эмад Мохамед М. Эвайс


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Дополнительные файлы

Для цитирования: Аттия М., Эвайс Э. Изготовление деталей двигателей автомобилей из Si3N4-керамики с добавкой MgO‒Al2O3 методом горячего прессования. Новые огнеупоры. 2020;(7):36-44. https://doi.org/10.17073/1683-4518-2020-7-36-44

For citation: Attia M., Ewais E. Hot pressed Si3N4 ceramics using MgO–Al2O3 as sintering additive for vehicles engine parts. NOVYE OGNEUPORY (NEW REFRACTORIES). 2020;(7):36-44. (In Russ.) https://doi.org/10.17073/1683-4518-2020-7-36-44

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