Eco-friendly design of complex refractory aggregates as alternatives to the magnesia-chromite ones

被引:8
作者
Borges, O. H. [1 ,2 ]
Coury, F. G. [1 ,2 ]
Muche, D. N. F. [1 ,2 ]
Pandolfelli, V. C. [1 ,2 ]
机构
[1] Univ Fed Sao Carlos, Grad Program Mat Sci & Engn, Sao Carlos, SP, Brazil
[2] FIRE Associate Lab, Mat Microstruct Engn Grp GEMM, Sao Carlos, SP, Brazil
基金
巴西圣保罗研究基金会;
关键词
Magnesia-chromite; Thermodynamics; Compositionally complex ceramics; Electrofusion; ELASTIC-CONSTANTS; PRESSURE; MGO; MECHANISMS; CERAMICS; TOXICITY; CRACKS;
D O I
10.1016/j.jeurceramsoc.2023.06.023
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Besides the good performance of electrofused magnesia-chromite aggregate (EMCA) in ceramic refractories, the generation of toxic Cr+6 after working conditions is driving its urgent replacement. Aiming at optimizing the search towards eco-friendly options, this work applied multiple electron-microscope-based techniques to assess its key microstructural features. BSE/EDS imaging coupled with thermodynamic calculations (CALPHAD) indicated that these aggregates were comprised of a periclase matrix where spinel precipitates (d50 & AP;15 & mu;m) were embedded, inducing microcracking due to the thermal expansion mismatch. EBSD technique highlighted its pattern, revealing a good fit with {110} planes, which agrees with the Zener-Stroh crack mechanism. Designing concepts of compositionally complex ceramics were applied to find eco-friendly EMCA alternatives. From the 154 simulated systems, the four most promising ones were experimentally produced and characterized. Although kinetics aspects must be addressed, Cr-free EMCA-inspired microstructures were obtained, highlighting that this design approach can be used to support the development of novel raw materials.
引用
收藏
页码:6536 / 6549
页数:14
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