Влияние добавок оксида графена на структуру наполнителя и физико-механические свойства углеграфитового нанокомпозита

Рассмотрено влияние добавок оксида графена (ОГ) на структуру и морфологию графитового наполнителя и прочностные характеристики конечных углеграфитовых композитов. Рецептурный состав опытных образцов шихты выбран с применением математического метода планирования эксперимента и плана Хартли. Определены гранулометрический состав образцов исходной и модифицированной шихты и их адсорбционная емкость по отношению к пеку. Для оценки структуры и морфологии частиц наполнителя использованы методы сканирующей электронной микроскопии, КР-спектроскопии, рентгеновской дифрактометрии, измерения виброплотности и удельной поверхности (по БЭТ). Показано, что при добавлении 0,9 мас. % ОГ в состав наполнителя формируется более плотное зерно с меньшим количеством пустот. При этом значение удельной поверхности снижается в 3,6 раза, а сорбционная емкость по отношению к пеку, напротив, возрастает в 2,7 раза, что указывает на изменение химического состава поверхности частиц наполнителя. По данным спектроскопии КР образцы модифицированной шихты характеризуются более высоким значением соотношения D/G, на поверхности частиц присутствуют функциональные группы, преобладают краевые дефекты. В ходе физико-механических испытаний образцов после обжига установлено, что за счет введения 0,9 мас. % оксида графена предел прочности при сжатии увеличивается с 35,5 до 97,5 МПа. Полученные результаты имеют важное значение для разработки новых композитных материалов триботехнического назначения.

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