The development of coarse‐grained refractory composites combining ceramics with metals provides new approaches for high‐temperature applications. In particular, Nb‐Al 2 O 3 are widely interested due to their promising functional properties such as high thermal shock resistance, low shrinkage and good electrical conductivity. order identify release the potential these materials in advanced appli...

Niobium-alumina composite aggregates with 60 vol% metal content and particle sizes up to 3150 μm are produced using castable technology followed by sintering, a crushing sieving process. X-Ray diffraction (XRD) analysis reveals phase separation during as the niobium:corundum volume ratios is between 37:57 64:31 among 4 aggregate classes 0–45, 45–500, 500–1000, 1000–3150 μm. The synthesized used...

This article analyzes the mechanism of protective layer formation under action alkali in a refractory castable when ground quartz sand (GQS) is used as an admixture to produce conventional castables (CC) and medium cement (MCC). It was found that, independently composition, addition GQS (2.5%) reduces degree K2CO3 dissolution at high temperature, released potassium reacts with silica forms visc...

A growing interest in designing high-alumina MgO-bonded refractory castables has been identified recent years due to the magnesia ability react: (i) with water at initial processing stages of these materials (inducing precipitation brucite phase) or (ii) alumina, giving rise situ MgAl2O4 generation high temperatures. Nevertheless, despite great potential caustic be used as a binder such systems...

Mold Shape Deposition Manufacturing (Mold SDM) is a Solid Freeform Fabrication technique for producing complex shaped fugitive wax molds. A variety of castable polymer and ceramic materials have been used to make parts from these molds. This paper describes the Mold SDM method and an automated mold building machine based on a commercial CNC mill. Process steps, material selection and equipment ...

Mold Shape Deposition Manufacturing (Mold SDM) is a Solid Freeform Fabrication technique for producing complex shaped fugitive wax molds. A variety of castable polymer and ceramic materials have been used to make parts from these molds. This paper describes the Mold SDM method and an automated mold building machine based on a commercial CNC mill. Process steps, material selection and equipment ...

The corrosion behavior of three sorts of refractories based on alumina-graphite were studied by immersion tests. The melts included smelting reduction molten slag and corresponding carbon saturated molten iron. The influence of test temperature, FeO content in slag and specimen rotative velocity on the corrosion rate of refractories was examined. By means of SEM and EDS, the microstructure chan...

Structural failure of concrete buildings on fire and complete destruction the monolithic refractory lining during their drying stage are dangerous examples effect explosive spalling partially saturated porous media. Several observations in both cases indicated presence moisture accumulation ahead front, which tune with most common theories concrete. Previous studies have shown evidence existenc...