This study investigated the mechanisms of stabilizing lead-laden sludge by blending it into the production process of aluminum-rich ceramics, and quantitatively evaluated the prolonged leachability of the product phases. Sintering experiments were performed using powder mixtures of lead oxide and γ-alumina with different Pb/Al molar ratios within the temperature range of 600-1000 °C. By mixing ...

Abstract Porous mullite ceramics were prepared from mixtures of Egyptian kaolinite-clay and calcined α-alumina powder. The effects two methods compaction as well types binder investigated. influence sintering temperature on the physical properties, crystalline phase, compressive strength microstructure was studied. Mullite bodies processed by uniaxial pressing utilizing 15wt. % water at 1500°C ...

The purpose of this study was to examine the effect of opaque on resin bonding to calcium phosphate crystalline ceramics (CPCC). Disk-shaped specimens were made from the calcium phosphate crystalline ceramics (Crys-Cera). All specimens were ground with 800-grit abrasive paper, cleaned and finally air-dried. Control group (CT group) didn't undergo any treatment. Coating of one layer opaque treat...

In transport of raw materials abrasive wear resistance is a requirement, which can be met with alumina ceramics. At certain locations additional impact load occurs, exacerbating the loss. As literature on impact-abrasive ceramics scarce this topic will researched in work. We selected variety commercial (90–96% Al2O3) and according to much more resistant – substantially expensive Zirconia Toughe...

Objective: To evaluate the transmittance (%T) and color difference (ΔE*) of six zirconia core materials compared to alumina, over eight colored substrates before after ceramic application. Methods: Experimental groups (n=5) standardized disk-shaped cores white zirconia, medium-colored Ice Translucent, Prettau (white D3 colored) were veneered a uniform thickness convenient by layering. Their %T ...

Porous ceramics have attracted researchers due to their high chemical and thermal stability. Among various types of porous ceramics, reticulated both porosity good permeability. These properties are difficult replace with metals polymers. ZTA is used in a variety applications, wealth experimental data has already been collected. However, research reports on zirconia-toughened alumina (ZTA) insu...

STATEMENT OF PROBLEM Ceramics are widely used for anterior restorations; however, clinical color reproduction still constitutes a challenge particularly when the ceramic crowns are used on titanium implant abutments. PURPOSE The purpose of this in vitro study was to investigate the effect of implant abutment material on the color of different ceramic material systems. MATERIAL AND METHODS F...

This study evaluated: I) the effect of photo-activation through ceramics on the degree of conversion (DC) and on the Knoop hardness (KHN) of light- and dual-cured resin cements; and II) two different protocols for obtaining the spectra of uncured materials, to determine the DC of a dual-cured resin cement. Thin films of cements were photo-activated through ceramics [feldspathic porcelain (FP); ...