Evaluating the Sintering Kinetics of Porous Sic Ceramics

Abstract

Porous ceramics made by burning out a pore-former during the sintering process were investigated by stepwise isothermal dilatometry (SID), x-ray diffraction (XRD) phase identification, scanning electron microscopy (SEM), and mechanical-property analysis. SID data obtained by the Makipirtti-Meng method was analyzed and was found to fit well with data on shrinkage obtained by means of the rate equation proposed for use with this method. Kinetic parameters were evaluated and it was established that sintering takes place through two main mechanisms. These mechanisms are related to the generation and sintering of oxidation products and have activation energies of 55.4 and 325.4 kJ/mole. The sintering temperature greatly affects such properties of sintered specimens as open porosity and ultimate flexural strength. The results obtained in the investigation were well-supported by microstructural analysis of the sintered specimens.

Generation of Pyroxene-Based Porous Ceramics from Steel Refining Slag

“…raw materials for preparing porous ceramics vary according to their application, and include SiC, Si 3 N 4 and Al 2 O 3 , [8][9][10][11][12] as well as metallurgical slag, waste glass and construction waste. [13][14][15][16][17] There are three methods generally used to produce porous ceramics.…”

Expansionless oxidation-bonded SiC microfiltration membrane by controlling the oxidation of SiC particle mixtures

“…She et al [25][26][27][28] expanded the research on oxidation bonding of SiC by controlling the oxidation phenomenon by varying the sintering temperature, particle size, and pore formers as well as adding alumina as an additive. Moreover, Dey et al [29] and Chun et al [30] incorporated petroleum coke and microbeads in an oxidation-bonding technique as pore formers, whereas Liu et al [31] utilized carboxymethyl cellulose and starch.…”