Strength Properties of Zirconium Dioxide Refractories Based on a Granular Mass at Temperatures Up to 2500K

摘要

The influence of the monoclinic phase on the strength of zirconium oxide was tested in a special high-temperature unit. It was shown that under room temperature conditions, the increase in the content of monoclinic phase impaired the strength characteristics of refractories. This phenomenon is caused by the structure of samples in which the monoclinic phase is characterized by a great number of cracks whose size and density increase with the monoclinic phase. At high temperatures the increase in the monoclinic phase has a positive influence on the strength characteristics of the material, caused by decreasing the amount of CaO in the material and a corresponding increase in refractoriness. An increase in the strength of the material was observed at temperatures above 2300 degrees K. (Author)