大试样热重分析仪及其在耐火材料研究中的应用

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

介绍了大试样高温热重分析仪的结构和特点以及在抗氧化性和氮化反应研究中的实际应用。该仪器由电加热、气氛控制、质量测量和自动控制四大系统组成。该仪器允许的最大试样尺寸为100mm×100mm×180mm,最大试样质量为5000g,最高试验温度达1600℃。该仪器既可以记录试样在匀速升温过程中的“质量-温度”曲线(升温法),又可以记录试样在恒定温度下的“质量-时间”曲线(恒温法)。采用升温法和恒温法分别研究了铝碳滑板试样和β-SiAlON结合刚玉试样的抗氧化性,并采用升温法研究了高铝矾土试样的氮化反应,结果均令人满意。

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 ℃. 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-SiAION -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.