Effect of Excess MgO on the Properties of Cordierite Ceramic Sintered by Solid‐State Method

Abstract

The effect of excess MgO mole ratio on the sintering behavior of cordierite ceramic was studied using XRD and SEM. The green bodies were sintered at 1100–1300°C by solid‐state method. The excess MgO did not obviously reduce the crystallization temperature but increased the production of liquid and densification. This effect has to be activated by a specific temperature. The starting material had little influence on the crystallization phase at 1200°C or higher. As basic magnesium carbonate can also be used as a pore‐forming agent, the shrinkage and porosity approached maximum value at 3.4 mole ratio of MgO.

Effect of Excess Magnesia on the Preparation of Cordierite Based on Waste Foundry Sand

“…The fabrication of cordierite is identified as a new potential use of WFS. In addition, because excess MgO can decrease the melting and crystallization temperature as well as impede the formation of μ‐cordierite, the ratio of MgO from cordierite stoichiometry is varied to investigate the effect of different MgO mole ration on the preparation of cordierite.…”

“…In Fig. , as the temperature increased to 1250°C, the main phases are cordierite and zircon, and excess MgO ratios lead to the appearance of sapphirine and forsterite which is also found in the works . Generally, temperature is the major factor in respect of the cordierite formation, and sapphirine is not consumed completely although the temperature increases to 1250°C.…”

The Synergistic Effect of Zinc Ferrite Nanoparticles Uniformly Deposited on Silver Nanowires for the Biofilm Inhibition of Candida albicans

“…These results indicate that the bonding characteristics of ZnFe 2 O 4 NPs remain unchanged during hybridization with AgNWs. Furthermore, the fact that the characteristic peaks of ZnO, which are supposed to appear at 1021.7 and 1044.9 eV, are not found, and the Zn 2p peaks are very sharp, indicates that Zn 2+ ions at octahedral sites are surrounded by tetrahedrally positioned Fe ions [37,38,39]. In addition, of the other potential compounds, the Fe 2 O 3 and Fe 3 O 4 phases are not formed, the Fe 2p 3/2 positions of which should be at 710.6 and 711.6 eV, respectively [40,41].…”

Effect of reduced Al2O3 mole ratio on fabrication of cordierite ceramic by solid-state sintering method

“…And the difference between the two fabrication methods causes the distinction of the final cordierite productions, including crystallization process and shrinkage behavior. For example, we have studied the influence of excess MgO on the properties of cordierite ceramic sintered by solidstate method [11], and the results are different from those of Banjuraizah [12] and Hwang [13]. The crystallization temperature did not reduce with the increase of MgO while the liquid glassy phase increased and the densification process was improved.…”

“…Parts of mullite reacts to produce sapphirine at low temperature and then increasing temperature results in the transformation of the sapphirine to the cordierite [11]. The left mullite will directly transform to be the cordierite phase at high temperature [12].…”