Advanced refractories for titanium metallurgy based on calcium zirconate with improved thermomechanical properties. Issue 14 (November 2019)

• Record Type: Journal Article
• Authors: Schafföner, Stefan; Bach, Miriam; Jahn, Constantin; Freitag, Lisa; Aneziris, Christos G.
• Is Part Of: Journal of the European Ceramic Society. Volume 39:Issue 14(2019)
• Page Start: 4394
• Page End: 4403
• Publication Date: 2019-11
• Subjects: Refractories -- Calcium zirconate -- Titanium alloys -- Thermal shock resistance -- Thermomechanical properties -- Microstructure; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2019.06.007
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Calcium zirconate refractories exhibit a promisingly high corrosion resistance in contact with titanium alloy melts. In the present article, we improved the thermomechanical properties of calcium zirconate based refractories by altering their microstructure and chemical composition. In a full factorial experimental design we investigated the effects of an insitu phase formation, of the addition of coarse grained MgO aggregates as well as the addition of SrCO3 . Based on these factors, the chemical, physical, mechanical and thermomechanical properties as well as the resulting microstructure were thoroughly characterized. Strikingly, the addition of SrCO3 resulted in significantly improved mechanical properties before and after thermal shock. The improved thermal shock resistance can be attributed to a lower determined thermal expansion coefficient, a homogeneous pore size distribution with a reduced pore size and a better bonding between the matrix and the coarse grained aggregates.