Effect of calcium phosphate addition on sintering of El-Oued sand quartz raw materials

Abstract

This work addresses the development of an eventual low cost ceramic insulating or microfiltration membrane supports from inexpensive raw materials such Eloued quartz sand (EQS) and calcium phosphate (CP) using uniaxially dry compaction method. The prepared samples were sintered at different temperatures ranging between 1200 and 1550 °C. Subsequently, the effects of sintering temperature and amount of CP on samples proprieties were investigated. It is observed that X-ray diffracion measurements confirmed that EQS was transformed into cristobalite and tridymite phases when both sintering temperature and holding time were increased. This transformation is favored with increasing amount of CP, it is observed also formation of CaSiO 3 and Ca(Fe)(Al) PO 4 . The SEM images of the samples sintered at different temperatures illustrate that silica grains, CP grains, intergranular phase contents (Si, Ca, P, and O) and an important open porosity depend on the sintering temperature. The porosity ratio changes in the range between 37% and 34% according to sintering temperature and to CP content; these values are in good agreement with SEM images. The thermal expansion behavior shows a weak expansion in the range of temperature between 600 and 1000 °C which is situated between 1.27% and 1.33% (variation of 0.05% at 400 °C).

Sintering and dielectric properties of a technical porcelain prepared from economical natural raw materials

“…As a result, powerful and continuous collisions may occur between the hard milling balls and the powder particles which substantially reduce the powder particle size. Many interesting published works have used this original milling system [23][24][25]; they concern hydroxyapatite based ceramics [26][27][28], wollastonite [29][30][31], diopside [32][33][34], anorthite [35,36], and others [37][38][39][40][41][42]. By drying, the test specimens for firing tests, shaped as discs of about 13 mm diameter and about 2 mm thickness, were obtained after uniaxial pressing of powders at 75 MPa.…”

Mechanical properties of anorthite based ceramics prepared from kaolin DD2 and calcite

“…In this work, the long-term goal is the development of a low cost anorthite from inexpensive raw materials, such as kaolin and calcite (CaCO 3 ) using a modified milling system. Many works have already been published for appreciating these native raw materials including bioceramics [9][10][11][12][13][14][15][16][17], advanced ceramics [18][19][20][21][22][23][24][25][26][27] and ceramic membranes [28][29][30][31][32][33][34][35][36][37][38][39][40][41][42]. Most of these publications are closely related to this work and clearly highlight their possible applications.…”

Sintering of anorthite based ceramics prepared from kaolin DD2 and calcite

“…Many works have already been published in three main interesting research topics for the valorization of these native raw materials. These topics are bioceramics [3][4][5][6][7][8][9][10][11][12][13][14], advanced ceramics [15][16][17][18][19][20][21][22][23] and ceramic membranes [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40]. Most of these publications are closely related to this work and clearly highlight their possible applications.…”