Effect of CaO Addition on the Sintering Behaviour of Anorthite Formed from Kaolin and CaO

Abstract

Thermal reactions and sintering behavior of kaolin DD3 (Djebel Debbagh, Algeria) and CaO mixtures to obtain dense anorthite ceramics were investigated. Mixed powders were uniaxially pressed and fired between 850 and 1150• C. Firing the pressed specimens yielded a dense anorthite ceramics. The sintered density increased with increase of CaO content and reached the maximum value of 2.57 g/cm 3 for the composition containing 10 wt% CaO and fired at 1150• C. Their coefficient of linear expansion of the sintered samples at 1100• C decreases with the addition of CaO. X-ray diffraction experiments carried out on the samples containing varied amount of CaO and fired at the temperatures higher than 1000• C for 2 h showed the presence of only anorthite phase.

Preparation of a Zirconia-Based Ceramic Membrane and Its Application for Drinking Water Treatment

“…Infrared spectra were recorded on a spectrophotometer equipped with an ATR accessory (Jasco FT/IR-4000). Infrared spectroscopy is a tool for mineralogists to characterize the crystallinity of materials, by observing the relative intensities of the hydroxyl (OH) vibration bands and that of the Si-O, Si-O-Si, Al-OH and Al-O in their structures [30,31].…”

The Effects of B2O3 Addition on the Properties of Anorthite Prepared from Algerian Kaolin

“…It is very interesting from a technological point of view, because is characterized by good resistance to thermal stress, low dielectric constant, and low thermal expansion coefficient [2,3]. This is what qualifies for use in wall tiles and porcelain, in the field of electronics industry and biomedical materials [4][5][6][7]. In general, fabrication of anorthite was widely studied by using different methods such as sintering of kaolin and calcite mixtures, mechanochemical treatments and sol-gel process [8,9].…”