Ceramic macro-needles incorporation as reinforcement in commercial refractory castable was studied. (Ø2x20 mm) were made from kaolinite clay and gibbsite to obtain mullite the main crystalline phase. Specimens with ceramic evaluated by compression after being treated at two temperatures (815 1400 °C). The results compared those obtained using same concrete but reinforced steel fibers without re...

The work of fracture refractories is commonly calculated from crack mouth opening displacements (CMODs) in wedge splitting tests (WSTs). This paper proposes a methodology for estimating the energy notch displacement (NOD) measurements, which useful setups where CMOD not accessible. NODs and CMODs are both faces two WSTs experiments on castable refractory via digital image correlation (DIC) fini...

This study was carried out to determine the design and thickness of the cervical margin of a castable ceramic restoration from the point of view of its castability. Castability of castable ceramics was lower compared to Ag-Pd-Au and Co-Cr alloy with the use of the mesh pattern and rod pattern test (p < 0.05). It was more dependent on the pattern thickness than alloys (p < 0.05), and perfect rep...

The gray level conservation is the underlying hypothesis of Digital Image Correlation (DIC). However, it may be challenging to enforce in some experimental configurations. Brightness and contrast corrections (BCCs) added registration procedure. Different types BCCs were implemented for global DIC, their benefits analyzed localized diffuse sources brightness changes. As a case study apply BCCs, ...

In an Al2O3-TiO2 mixed oxide system, the incorporation of TiO2 to alumina is known to increase the acidity of the resulting mixed oxide; depending strongly on the preparation method and the titania concentration. When using TiO2 as a support of NiMo catalysts, initial catalytic activity in hydrodesulfurization reactions is much higher than that on catalysts based on pure alumina. One of the mai...

The refractory solid electrolyte, sodium beta alumina, is cold sintered at 375 °C which over 1000 lower than conventional sintering. A relative density above 90% and an ionic conductivity of 10 ?3 S cm ?1 (300 °C) obtained.

Abstract Refractory ceramics were produced from clays and alumina waste. Specimens shaped by uniaxial pressing, subjected to thermal analysis dilatometry heat-treated in a conventional furnace at 1300 1400oC, applying heating rate of 5oC/min dwell time 2 3 hours the maximum temperature. The samples characterized X-ray diffraction (XRD), scanning electron microscopy (SEM) physicomechanical prope...

Properties are provided for submicron aluminum oxide developed in SAO PKF NK low-cement refractory concretes, and also the LCRC of aluminosilicate composition obtained. It is demonstrated that properties concretes prepared on basis alumina no worse than domestic imported analogs.