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Influence of Selected Additives and Cao:sio2 Ratio on High- temperature Strength of Mgo Refractories.
MISSING :8 pages
The Bureau of Mines investigated the effect of controlled additions of selected metal oxides, as well as the adjustment of the calcia-to- silica ratio on the high-temperature strength of refractory-grade periclase. Increases in the hot flexural strength of some periclase materials in the range of threefold to fourfold were obtained with additions of zro2 and by adjustments of the cao:sio2 ratio to the 2.5 to 3.0 Level. Results show that for each periclase refractory raw material, there exists a combination of level of zro2 addition and an adjustment to the cao:sio2 ratio that optimizes the hot flexural strength of each of these materials. Data also indicate that the improved hot strengths can be attributed to the high- temperature secondary phases formed between the different levels of periclase impurities and the additives, resulting in improved intergranular high-temperature bond strength.
IH; Report of Investigations
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division