Novel aluminum borate foams with controllable structures as exquisite high-temperature thermal insulators

Phase formation, microstructure development, and mechanical properties of kaolin‐based mullite ceramics added with Fe2O3

“…As discussed above, Fe 3+ ions were incorporated into mullite, thus forming solid solutions at high temperatures. The substitution of Al 3+ with Fe 3+ reduced the activation energy of ion diffusion 10,24 . According to the corresponding EDS result (Table 3), the glassy phase was formed and the mullite phase was coated with glassy impurities.…”

“…The substitution of Al 3+ with Fe 3+ reduced the activation energy of ion diffusion. 10,24 According to the corresponding EDS result (Table 3), the glassy phase was formed and the mullite phase was coated with glassy impurities. The compositions of the glassy phase are K, Ca, Na, and Fe, probably because excessive iron is easy to form a low-melting silicate phase.…”

“…However, the production of high‐purity and high‐density mullite is still a challenge. Also, to produce cost‐effective mullite ceramics, it is suggested to use industrial raw materials or natural minerals as the precursor 22–24 . Although there is a large reserve of kaolin in China, it has not been fully utilized, especially in high‐performance and high‐value‐added products 12,25,26 .…”

“…Also, to produce cost-effective mullite ceramics, it is suggested to use industrial raw materials or natural minerals as the precursor. [22][23][24] Although there is a large reserve of kaolin in China, it has not been fully utilized, especially in high-performance and high-value-added products. 12,25,26 Nevertheless, kaolin has been explored for the fabrication of mullite ceramics.…”

Effects of flake-shape and content of nano-mullite on mechanical properties and fracture process of corundum composite ceramics

“…In practice, both mullite and cordierite have been successfully prepared by using molten salt method [4][5][6][7], sol-gel method [8,9]and solid-phase method [10][11][12][13][14][15], with gangue as a raw material. In addition, these ceramic materials are used in various aspects, such as catalytic degradation [16,17], thermal insulation [18][19][20][21], and many others [22][23][24]. Although significant progress has been made in using coal gangue to prepare industrial ceramic powders, there are various problems.…”