Влияние нормализующего нагрева пресс-порошков ферритов на уплотнение при радиационно-термическом спекании.
DOI:
https://doi.org/10.31489/2021No3/11-14Ключевые слова:
ферриты, спекание, электронные пучки, предварительный отжиг порошков, линейная усадка, активационная модель усадки.Аннотация
Исследована линейная усадка образцов литий-титанового феррита при радиационно-термическом и термическом спекании. Перед прессованием часть порошков подвергалась термическому нагреву в течение 2 часов при температурах 1273, 1373 и 1473 К. Установлено, что изменение кинетики усадки ферритов после отжига порошков согласуется с классическими представлениями о термическом девозбуждении порошков за счет отжига дефектов. Такие дефекты образовывались в зернах порошка при шлифовании. Анализ полученных данных позволил предложить наиболее вероятную модель радиационно-термической активации спекания порошкового феррита. Получена модель радиационного торможения релаксации неравновесных дефектов.
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