ТЕОРЕТИЧЕСКИЕ ИССЛЕДОВАНИЯ И РЕШЕНИЯ ОПТИМАЛЬНЫХ РЕЖИМОВ ПРОЦЕССА ТЕРМИЧЕСКОГО НАПЫЛЕНИЯ HVOF ДЛЯ ПОКРЫТИЯ Cr₃C₂-NiCr

В статье рассмотрены теоретические исследования покрытия из Cr₃C₂-NiCr для подложки из циркония. Для получения данного покрытия был исследован один из высокоэффективных методов – высокоскоростное кислородно-топливное термическое напыление (HVOF). Нанесение покрытия производилась на различные образцы подложек из циркония толщиной 3–5 мм, длиной 20 мм и шириной 30 мм, при скорости напыления 600–700 м/с. Температура во время напыления методом HVOF составляет около 3000 °С, температура охлаждения 27 °С. Исследуя теоретические данные для покрытия из Cr₃C₂-NiCr определены развивающиеся и тепловые напряжения после обработки HVOF методом Стоуна и уравнениями Бреннера и Сендероффа с толщиной покрытия не более 0,6 мм для карбидных покрытий. По результатам теоретических исследований были найдены значения эффективности осаждения методом, предложенным Kosaku Shinoda. По результатам теоретических и математических расчетов эффективность осаждения для покрытия из Cr₃C₂-NiCr с подложкой циркония находится в пределах 59,5–69,4%. Таким образом, было установлено, что эффективность осаждения для покрытий зависит от толщины подложки, скорости подачи порошка, а также от массы наносимого материала и, соответственно, от количества проходов напыления.

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