Abstract
The present paper is the third of a series of papers on a new chemical bond on magnesia refractories. Results of the compressive creep testing of the chemically bonded samples at elevated temperature up to 1500°C, prepared from sea-water magnesia (Japan) and natural magnesite (Salem, India), cured at 110°C for 24 hrs, have been presented in this part. Samples prepared with the bond (0.25 wt%) evaluated by creep experiments with a compressive load of 3 kg.cm−2 up to 1500°C for 30 hrs showed a maximum strain rate of 0.2% per hour without failure. This makes it an acceptable chemical bond of the future for magnesia refractories. The deformation mechanism suggested a diffusion controlled Nabarro-Herring creep, while a grain-boundary diffusion process might also be a possibility.
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