Хабаровский Федеральный исследовательский центр Дальневосточного отделения Российской академии наук Институт материаловедения Дальневосточного отделения Российской академии наук (ИМ ДВО РАН), Хабаровск, Россия

М. И. Дворник, старший научный сотрудник, канд. техн. наук, эл. почта: maxxxx80@mail.ru
Е. А. Михайленко, старший научный сотрудник, канд. физ.-мат. наук, эл. почта: mea80@list.ru
А. А. Бурков, старший научный сотрудник, канд. физ.-мат. наук, эл. почта: burkovalex@mail.ru
Е. В. Черняков, лаборант, эл. почта: tchernyakoffevgeny@yandex.ru

Проведены исследования прессования заготовок фрезы из твердого сплава WC – 5TiC – 10Cо в испаряемые пресс-формы из полилактида, полученные методом 3D-печати, и последующего спекания образцов в вакуумной печи. Содержание пластификатора (каучука) в порошковых смесях для прессования заготовок образцов сплава WC – 5TiC – 10Cо составляло, % (об.): 13; 23; 38; 48. Одноразовые формы для прессования фрез были изготовлены из полилактида методом наплавки. Опытным путем установлено, что заключенные в стальную оболочку такие пластиковые пресс-формы выдерживают давление 400 МПа. Исследованы зависимости целостности и плотности заготовок и спеченных образцов от давления прессования и концентрации пластификатора. Установлено, что увеличение его концентрации с 13 до 48 % (об.) ведет к снижению относительной плотности спеченных образцов с 99,2 до 96,0 % из-за роста концентрации включений свободного углерода. В результате исследований обнаружено, что при концентрации пластификатора менее 38 % (об.) образцы разрушаются из-за термических напряжений. Изделия, полученные при использовании 48 % (об.) пластификатора, сохраняют целостность. Исследованы микроструктуры поверхности, продольного и поперечного сечений спеченных фрез. Несмотря на достижение требуемой плотности, поверхностные дефекты и высокая пористость (из-за наличия свободного углерода и дефектов, образованных при деформации формы) не позволяют получать изделия, отвечающие современным требованиям. Необходимы дальнейшие исследования для производства по предлагаемой методике фрез, отвечающих современным требованиям.

Работа выполнена при поддержке гранта РНФ № 23-29-00063.

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