Dissolution-precipitation mechanism of combustion synthesis of calcium aluminate. Issue 17 (1st December 2017)

• Record Type: Journal Article
• Authors: Yang, Shoulei; Xiao, Guoqing; Ding, Donghai; Ren, Yun; Lv, Lihua; Yang, Pan
• Is Part Of: Ceramics international. Volume 43:Issue 17(2017)
• Page Start: 15918
• Page End: 15926
• Publication Date: 2017-12-01
• Subjects: Calcium aluminate -- Combustion synthesis -- Mechanism -- Combustion front quenching method; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2017.08.167
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The mechanism of combustion synthesis (CS) for calcium aluminate was analyzed by a combustion front quenching method. The phase compositions of different zones in the quenched sample were examined by X-ray diffraction (XRD). The microstructural evolution during the CS process was explored by field-emission scanning electron microscopy equipped with energy dispersive spectrometer (FESEM-EDS). Moreover, the combustion temperature and wave velocity were measured. The results showed that the combustion reaction started with the decomposition of CaO2 and melting of Al, at the same time, O2 reacted with Al forming Al2 O3, which released a large amount of heat to fuse CaO and Al2 O3 forming the liquid. Finally, calcium aluminates with good crystallinity would be gradually precipitated from the CaO-Al2 O3 liquid. Furthermore, a model corresponding to the dissolution-precipitation mechanism was proposed.