Sol–gel derived cordierite glass–ceramic doped CaO and B2O3: sintering, crystallization and phase transformation characteristics

Formation of anorthite containing cordierite materials through reaction sintering kaolin, MgO and CaO precursors

“…However, reaction sintering abundant natural clay minerals and/or waste [4,7,[18][19][20][21][22][23][24] remained the preferred way to produce unexpansive cordierite materials. Intentionally, additives such as nickel dioxide [25], zinc [26], phosphorous and boron oxides [27], phosphorous oxide [28], ceria [29], nickel dioxide and titania [30], barium oxide [31], magnesia [32,33], and calcium oxide [8,[34][35][36][37] are added to ease the nucleation and growth of cordierite.…”

“…[34] prepared magnesia-alumina-silica based glass ceramics by melting method using pure chemical reagents and found that certain content of CaO promotes the glass crystallization, and transfers sapphirine to ɑ -cordierite. Also, addition of CaO in the presence [35] or absence of B 2 O 3 [36] was reported to improve sintering and the formation of cordierite in glass-ceramics prepared via sol-gel method. Similar trend was observed by Guo-hua Chen [37] who investigated the influence of replacing magnesium oxide by calcium oxide on phases formed in the magnesia-alumina-silica system.…”