| 摘要 |
FIELD: refractory materials. ^ SUBSTANCE: materials contain: 40-55% Al2O3, 32-45% ZrO2, 10- <16% SiO2, and 1-3% alkali metal oxide selected from Na2O, K2O, and mixture thereof with microstructure including alpha-silica crystals, free zirconia crystals, eutectic crystals, and intercrystalline vitreous phase, at least 20% of free zirconia crystals in working zone of material having dendrite morphology. Indicated crystals accrete with each other and with eutectic crystals. At least 40% of dendrite free zirconia crystals are more than 300 microns in size. ^ EFFECT: increased resistance to corrosion without significant increase in zirconium content. ^ 6 cl, 5 dwg, 3 tbl |
