Том 337 № 4 (2026)
DOI https://doi.org/10.18799/24131830/2026/4/5553
Влияние борной кислоты на фазообразование в системе «гидроксид кальция – нанопорошок алюминия» in situ
Актуальность. Диалюминат кальция CaAl4O7 представляет интерес как для строительной отрасли, так и для производства светодиодов и декоративных покрытий благодаря проявлению хороших люминесцентных свойств CaAl4O7 при легировании ионами редкоземельных и переходных металлов. Широкое распространение для синтеза алюминатов получил метод твердофазного синтеза в системах Ca(OH)2/CaCO3–Al2O3 с добавлением плавня на основе H3BO3. Переход от Al2O3 к металлическому Al в таких системах позволяет увеличить скорость реакции за счет дополнительного нагрева системы при окислении Al. Наноразмерные порошки Al также повышают реакционную способность системы из-за большой площади удельной поверхности. Однако добавление плавня к таким системам может оказывать как положительный (синтез в жидкой фазе), так и отрицательный (препятствие окислению Al) эффекты. Поэтому оценка влияния плавня на синтез алюминатов в системах с металлическим порошком алюминия требует отдельного исследования. Цель. Исследование влияния H3BO3 (плавня) на процессы фазообразования алюмината кальция в системе Ca(OH)2–Alнп. Методы. Рентгенофазовый анализ in situ с применением синхротронного излучения. Нагрев порошковых составов осуществлялся в атмосфере воздуха платиновым нагревателем в диапазоне температур 25–1350 °С со скоростью 30 °С/мин. Результаты и выводы. Борная кислота выступает ингибитором образования карбоната кальция (CaCO3) в температурном диапазоне 25–900 °С. Плавень также способствует снижению температуры формирования моноалюмината кальция (CaAl2O4) с 1149 до 1110 °С и диалюмината кальция (CaAl4O7) с 1330 до 1245–1260 °С. Установлено образование промежуточной фазы Ca3B2O6 в борсодержащей системе при температурах 680–900 °С, которая исчезает при завершении синтеза. Предложен механизм действия плавня, предполагающий улучшение контакта между твердыми фазами в жидком расплаве B2O3 и лучшей диффузии кислорода в промежуточной фазе Ca3B2O6. Полученные результаты имеют практическое значение для оптимизации синтеза люминесцентных материалов на основе алюминатов кальция и расчета исходного состава компонентов при использовании твердофазного метода синтеза.
Для цитирования: Влияние борной кислоты на фазообразование в системе «гидроксид кальция – нанопорошок алюминия» in situ Д.С. Токарев, А.В. Мостовщиков, М.Р. Шарафутдинов, М.С. Сыртанов, А.Е. Каргин. Известия Томского политехнического университета. Инжиниринг георесурсов, 2026, Т. 337, № 4, С.115-126.
Ключевые слова:
алюминат кальция, борная кислота, плавень, фазообразование, синхротронное излучение, люминесцентные материалы, in situ РФА
Библиографические ссылки:
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