Abstract
The effect of temperature and duration of heat treatment of samples based on a highly concentrated ceramic binder suspension (HCBS) of a composite composition (bauxite + 11% VDKS), as well as with an additional content of 15% silicon carbide on their phase composition, structure, and some properties is studied. Long-term heat treatment (60 and 120 hours) in the temperature range 1300 - 1400 ° C is carried out in a tunnel kiln for firing dinas. In the process of heat treatment, the process of formation of secondary mullite, the oxidation of SiC followed by mullite formation, proceeds. The influence of the heat treatment duration on the phase composition, as well as the strength, apparent density, growth, SIC oxidation state, and bending strength of samples containing 15% SiC are characterized. It is found that the minimum porosity value (2.7 %) is observed when the heat treatment duration is 8 hours. This drop in porosity and a slight decrease in density is due to a certain degree of mullitization or SiC oxidation, but also to the formation of a significant volume of closed porosity. With increasing the duration of the firing process to 60 and 120 hours, the porosity indicators increase significantly, and the density decreases sharply.
Highlights
It is found that the minimum porosity value (2.7 %) is observed when the heat treatment duration is 8 hours
This drop in porosity and a slight decrease in density is due to a certain degree of mullitization or SiC oxidation, and to the formation of a significant volume of closed porosity
Влияние температуры обжига на фазовый состав, структуру и некоторые свойства материалов на основе высококонцентрированной керамической вяжущей суспензии (ВКВС) композиционного состава: боксит, электрокорунд, кварцевое стекло // Новые огнеупоры
Summary
2. Влияние температуры обжига в области 1000 – 1400 оС и длительной выдержки в туннельной печи (60 часов при 1300 – 1400 оС) на динамику фазовых превращений образцов на основе ВКВС композиционного состава в системе Al2O3–SiO2 (а), обозначения: 1 – корунд, 2 – муллит, 3 – стеклофаза и Al2O3–SiO2 –SiC (15 %) (б, в), обозначения: 1 – корунд; 2- муллит; 3 – SiC; 4 – стекло (аморфная фаза); 5 - кристобалит; 6 – соединения на основе титана (Al2TiO 5, TiO2) Рис 3 Рентгенограммы образцов на основе ВКВС композиционного состава в системе Al2O3–SiO2, (а, исходный состав) и Al2O3–SiO2 –SiC (15 %) (б) после обжига при 1150 оС и туннельной печи (ТП), обозначения: к - корунд (Al2O3); м – муллит (3Al2O3·2SiO2); т – тиаллит (Al2TiO5); кр – кристобалит (SiO2); ст – стекло
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