Characterization of porcelain tableware formulation containing bentonite clay

Abstract

Aluminosilicate are often produced from kaolin with a kaolin bond in the formulation intended to increase the thermal strength of the product. Because kaolin formulations do not sinter well, investigation of methods for increasing the density of kaolin is highly relevant. The density can be increased by increasing the degree of dispersion. An additive which improves sinterability would be especially effective. Bentonite with its high plasticity and reactive surface meets these requirements to a certain extent. Four formulations of the porcelain tableware were prepared in different percentage from 0 to 15 wt.% of calcic bentonite. The mass loss and shrinkage of different formulations were measured by using the following thermal analysis such as: Differential thermal analysis (DTA), thermal gravimetric analysis (TGA) and dilatometric analysis. Its density, water absorption, total porosity and the flexural strength were also measured at different temperatures between 1250 and 1400°C. It was found that the bentonite added to the formulation increases the strength of the product and reduces the total porosity to 3.35% by increasing the degree of dispersion during the grinding of the components, thereby improving the sintering process of the formulation. On one hand, the weight loss, shrinkage and sintering time were decreased. On the other hand, the thermal resistance and flexural strength were increased at 1380°C for 10 wt.% of bentonite content.

Colombian clays binary mixtures: physical changes due to thermal treatments

“…At 100ºC, a clear structure collapse was observed because the porosity was destroyed. These results consistent with the results reported earlier for mineral clays such as kaolin, bentonites, and montmorillonites [13].…”

“…This opened new pores during the dihydroxylation, thereby increasing the pore size compared with the other samples. In turn, the rapid decrease in the surface area and pore volume at the temperatures higher than 700°C was due to the collapse of the 2:1 (TOT) layer structure, as has been previously observed by Bayram [13].…”

“…On the other hand, the ceramic industry usually uses binary, ternary, and multiple mixtures of clays as raw materials to produce different earth-ware products. Usually, 0 w.t% to 100 w.t% of each compound with 20 or 25 w.t% intervals are used for binary mixtures [13]. In addition to the composition, other factors related to processing such as grain size, pressure, mixture concentration and thermal treatment are necessary to understand the technical characteristics and final properties of a ceramic product [14].…”

Effect of Karangnunggal bentonite addition on the mechanical strength of conventional ceramics

“…Two types of bentonite are known as sodium (sodic) bentonite and calcium (calcic) bentonite (Savic-Gajic et al, 2014;Boussak, Chemani and Aicha, 2015). The sodium bentonite contains more Na + ion than Ca 2+ and Mg 2+ ions.…”

The Effect of Surface-Treated Anhydrous Borax Additions on Hard Porcelain Properties

“…Lately, some research has been performed to evaluate the feasibility of decreasing the firing temperature of porcelain by using additives. According to the relevant literature, there are various studies involving the employment of replacing potassium feldspar with soda-lime glass [29], glass waste [30], blast furnace slag [31,32], bentonite [33], scrap-glass [34] and wollastonite [35]. The observed lower firing temperature over the feldspar porcelain makes it an economical alternative as well [26].…”