Механизм формирования карбидокремниевого покрытия диффузионным методом в кремниевой засыпке на углерод-углеродных композиционных материалах
DOI:
https://doi.org/10.17072/2223-1838-2020-4-385-401Ключевые слова:
ультравысокотемпературное керамическое покрытие, углерод-углеродный композиционный ма-териал, карбид кремния, диффузионное насыщениеАннотация
Диффузионный метод с помощью порошковой засыпки, применяемый для нанесения покрытий, описывается, как правило, с точки зрения твердофазной диффузии, приводящей к насыщению приповерхностного слоя обрабатываемой заготовки определенным элементом. На углерод-углеродных композиционных материалах данный метод позволяет осаждать покрытие из карбида кремния, повышающее стойкость материала к действию высокотемпературных окислительных сред. Анализ кинетических особенностей процесса формирования карбида кремния на углеродном материале указал на отличие данного метода от классического диффузионного насыщения. Оказалось, необходимо учитывать дополнительные процессы газообразования, происходящие в порошковой засыпке. Предложен механизм, согласно которому возможен перенос кремния через газообразный реагент SiO, генерируемый в засыпке с помощью оксидных добавок, подобных оксиду алюминия, ранее считавшихся инертными.Библиографические ссылки
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