| 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 llO'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-• 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. |
