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Partially stabilization of Zirconia and its effects on the Magnesia - Spinel refractory properties

Kazemi, A ; Sharif University of Technology | 2006

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  1. Type of Document: Article
  2. Publisher: 2006
  3. Abstract:
  4. In this research, Magnesia Spinel refractories were formulated by using sintered magnesia, Tabular and Calcined Alumina and sintered Spinel. The grain size distribution of raw materials was modified, using the Andreessen equation. In order to improve the physical and mechanical properties and corrosion resistance of specimens, none stabilized Zirconia was added to the system. The pressed samples were sintered at 1700°C and the properties were evaluated at room and high temperatures. The formed phases and resultant microstructure were also, analyzed by XRD and SEM. The corrosion test was conducted in two parts. First, the depth of corrosion was measured in two zone, within 0-1mm and 1-2 mm from corrosion surface. In second part, the phases that were produced due to corrosion process were detected by XRD analysis. The XRD analysis showed that Zirconia was partially stabilized during the process. The results also showed that the density and porosity of the samples were in the standard ranges (respectively, 2/87-2/95 g/cm3 and 1520%). The mechanical properties of the samples at low and high temperatures, with and without Zirconia were compared with each other. In comparison, these samples caused a higher mechanical property in the system, better corrosion resistance. The main reason was the micro-cracking which was observed "clearly" in the system. The samples with Zirconia showed a better bonding between the magnesia and Spinel particles and also these samples showed a higher corrosion resistance against cement clinker
  5. Keywords:
  6. Corrosion resistance ; Magnesia ; Microcracking ; Microstructure ; Sintering ; Cement clinker ; Corrosion surface ; Sintered Spinel ; Zirconia refractories
  7. Source: UNITECR '05 - Unified International Technical Conference on Refractories: 9th Biennial Worldwide Congress on Refractories, Orlando, FL, 8 November 2005 through 11 November 2005 ; 2006 , Pages 715-721 ; 1574982656 (ISBN)