Tailoring the microstructure of mechanoactivated Al2O3 and SiO2 mixtures with TiO2 addition

Synthesis and characterization of titanium doped sodium beta″-alumina

“…Erkalfa et al [20] reported that TiO 2 could promote the sintering process of alumina by enhancing the Al 3+ diffusion due to the increasing concentration of the Al 3+ vacancies. Zhang et al [21], etc. also reported that doping levels of TiO 2 is beneficial to densification of Al 2 O 3 and SiO 2 mixtures.…”

“…It leads to the loss of sodium, which must deteriorate the ionic conductivity seriously. Doping with certain oxides is supposed as an effective way to improve the properties of the conventional ceramic [16,20,21], such as densification [20][21][22], magnetic properties [23] and electrical properties [16,[24][25][26][27]. Erkalfa et al [20] reported that TiO 2 could promote the sintering process of alumina by enhancing the Al 3+ diffusion due to the increasing concentration of the Al 3+ vacancies.…”

Mullite whiskers prepared by molten salt method using Si powders

“…Mullite whiskers have attracted attention as a possible reinforcement for high temperature structure materials. Various processing routes have been reported for the preparation of mullite whiskers such as sol-gel [1,2], high-energy ball milling process [3][4][5], internal crystallization method [6] and thermal decomposition of minerals [7]. However, these conventional synthesis methods have apparent shortcomings that the reactive system needs providing higher crystallization temperature and longer crystallization time.…”

Preparation and characterization of mullite whiskers from silica fume by using a low temperature molten salt method

“…Mullite whiskers are effective materials for the reinforcement of various composite materials because of their high strength and stiffness combined with large aspect ratios. Many efforts have made to prepare mullite whiskers, including thermal decomposition of minerals [1], rare earth oxide doping [2,3], sol-gel pressing [4], internal crystallization method [5] and high-energy ball milling process [6][7][8][9]. However, mullite formation by conventional methods requires a temperature of above 1200 • C, and full crystallization occurs at around 1600 • C. Developing new approaches to prepare mullite whiskers at lower temperature still remains a challenge.…”