High temperature thermogravimetric analyzer for large sized specimen and its application in refractories research

The structure and characteristics of the high temperature thermogravimetric analyzer (TGA) for large sized specimens and its application in researches of oxidation resistance and nitridation reaction were introduced. The TGA consists of four systems, including electronic heating, atmosphere control, mass measuring and automatic control. The apparatus accepts samples with maximum dimensions of 100 mm × 100 mm × 180 mm, maximum mass 5000 g, and maximum experimental temperature 1600°C. It is not only capable of measuring mass-temperature curves at elevating temperature (by elevating temperature method), but also recording mass-time curves at constant temperature (by constant temperature method). The oxidation resistance of Al₂O₃-C slide plate and the specimens of β-SiAlON-Al₂O₃ were determined by both methods and the nitriding reaction of high alumina bauxite specimens was determined by elevating temperature method, all of which have achieved approving results.