OBJECTIVES This study aimed to evaluate the effect of different ceramic surface treatments after machining grinding on the biaxial flexural strength (BFS) of machinable dental ceramics with different crystalline phases. MATERIALS AND METHODS Disk-shape specimens (10mm in diameter and 1.3mm in thickness) of machinable ceramic cores (two silica-based and one zirconia-based ceramics) were prepar...

Abstract To purify water at low cost for our daily life, the effect of ceramic-based (mullite–cristobalite) and (mullite–zircon) powders doped with different amounts magnesium oxide (MgO) (10 20 wt%) was studied. These compounds are made a local raw material DD3 addition zirconia (ZrO 2 ) to create an open porosity. The were prepared by traditional mixing method help automated crushing. MgO dop...

Zincand silver-doped mullite ceramic discs were prepared and tested as potentially resistant materials against bacterial adhesion and biofilm formation. Elemental analysis and X-ray diffraction studies showed that zinc ions were incorporated in the structural framework of the mullite, while silver ions remained outside the mullite crystal lattice, which allowed their slow (0.02 ppm/24 hours) le...

New binary catalytic systems based on sulphated zirconia-alumina were synthesized by controlled hydrolysis of alkoxides using relative molar ratios constituents 1:1, 1:2 and 1:3 in favour zirconia. The obtained differences the final material?s properties may be related to organic precursor memory effect, applied calcinations temperatures used alumina contents. addition zirconia affected structu...

+*Clarke, I C, Brown, S, Pezzotti, G, Green, D D, T. Donaldson, T D +Loma Linda University, Loma Linda, CA [email protected] INTRODUCTION The feature that makes yttria-stabilized, tetragonal zirconia polycrystalline (Y-TZP) ceramic both strong and fatigue resistant is its ability to partially transform under stress from tetragonal phase to its monoclinic phase, i.e. an inherent metastability [1]....

The ballistic impact performance of nanocrystalline zirconia-toughened alumina (nZTA) ceramics, comprising 15 wt% nano-yttria-stabilised zirconia in a sub-micron matrix, have been studied through depth penetration tests and compared to the results for monolithic alumina. resistance each material was evaluated by fitting against thickness ceramic targets. These show that, despite micro-Raman ana...

High-alumina coal fly ash (HAFA: 45% Al2O3 and 40% SiO2) is regarded as a special solid waste that generated from power plants in northwestern China. It an important substitute for bauxite applied to prepare mullite-based ceramics. In this work, hydrometallurgy–pyrometallurgy synergistic process proposed resolve the lower Al2O3/SiO2 mass ratio (Al/Si) degree of crystallinity can promote formati...