Deformation measured with baseline calibration method and its application in determination of compressive strength of fireclay bricks at elevated temperature
The coupling effect between temperature and stress can cause excessive deformation of refractory materials,thereby endangering the stability of the furnace lining structure.Therefore,accurate measurement of deformation is essential for designing and predicting furnace lifespan.The load softening temperature and creep rate are the main methods for evaluating the high-temperature compression deformation of refractories at low stress levels.However,applying these methods directly to high stress levels may lead to issues such as bent pins,broken pins,and gasket deformation.To address this challenge,a baseline calibration method based on the displacement recording function of the pressure machine for evaluating high-temperature compression deformation of refractories was proposed,and the principle and rationality of this method were elaborated in detail.According to the softening temperature of fireclay bricks,the high-temperature compressive strength was measured at different temperatures,and the measurement deviation was compared.The minimum deviation was 3.2％.By using CT technology to detect the internal pore distribution of the sample after the experiment,the closed-cell porosity increased from 3.43％ to 8.10％.Combined with phase and typical morphology analysis,it further indicates that the baseline calibration method has high accuracy and practicality.Based on the experimental results,the judgment criteria and definition of high-temperature compressive strength were proposed,providing theoretical support for the research of refractory materials and the design of high-temperature furnace linings.
refractory materialfireclay brickcompressive deformationbaseline calibration methodcompressive strength at elevated temperature
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