A comparative study on bonding systems in alumina-silicon carbide-carbon-based trough castable

Abstract

An alumina-silicon carbide-carbon-based trough castable is studied with silica sol and calcium aluminate cement-bonding. The castable compositions were prepared by continuous particle size distribution coefficient of 0.21 and processed by conventional processing techniques with heat treatments at 110, 900 and 1500°C. The changes in physical and mechanical properties like bulk density and cold crushing strength with varying amounts of SiC and C were studied. The phase analysis and microstructural developments at high-temperature are also characterised. Cement-bonding showed better dried strength and sol bonding showed no degradation in strength with increasing temperature. Mullite was observed in the fired samples with hibonite and anorthite phases in cement-containing compositions.

Submicron SiO2 Powder: Characterization and Effects on Properties of Cement‐Free Iron Ditch Castables

“…us, to solve this problem, refractory workers have carried out extensive research on cement-free combinations of iron ditch castables, and the general method of fabrication entails replacing pure calcium aluminate cement with silica sol or hydraulic hydrated alumina [8]. However, the applicability of silica sol is limited [9,10] due to the disadvantages such as the reduced early strength exhibited by iron ditch castables bonded using silica sol while the time available for construction is severely limited and there is the high susceptibility to freezing in winter.…”

Effects of in situ synthesis of CNTs/SiCw on microstructure and properties of Al2O3–SiC–C composites

“…For example, Al 2 O 3 has high strength and erosion resistance; the SiC and carbon have high thermal conductivity, low thermal expansion and nonwettability of molten liquid. Therefore, Al 2 O 3 –SiC–C composites are widely used in the iron–making process, particularly in iron runner . However, with the progress of smelting technology, the using conditions of Al 2 O 3 –SiC–C composites are becoming more and more demanding, such as the high efficiency, low cost, higher iron influx, long service life and so on.…”