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اثر در جرم ریختنی Cr2O3

اثر در جرم ریختنی Cr2O3

"Investigating the effect of chromium oxide on rheological, physical, and mechanical properties of low-cement high alumina castable"

Yasaman.Mohammadi (The head of research and development department of ZICO Refractories CO.) Behzad.Azimi (The factory manager of ZICO Refractories CO.)

Abstract
In this research, the effect of addition of 1, 2 and 3wt% chromium oxide on rheological, physical,
and mechanical properties of a low-cement high alumina castable has been investigated. For this
purpose, tabular alumina, calcium aluminate cement 80PX, reactive alumina, silica fume, and
industrial grade Cr(III) oxide (Cr2O3) were used as raw materials. Then different compounds were
prepared and fired at 815°C, 1200°C and 1500°C for measurement of density, percentage of
permanent linear changes, cold crushing strength, and cold modulus of rupture. The results
showed that the optimum rheological properties, density, cold crushing strength, and cold
modulus of rupture were obtained for the samples containing 2wt% of chromium oxide in thier
composition. It was mainly due to formation of a solid solution phase in the grain boundaries and
the filling of the pores.
1.Introduction
In the last decades there has been an increasing trend among refractories towards replacement
of bricks by castable refractories[1]. Quality requirement of these products is also increasing.
Especially low-cement castables have been widely used in steel industry due to their superior
rheological and physical propertiesh[2]. Initially, castable refractories were composed of only
cement and aggregates. Then, the addition of deflocculants and fine fillers have followed with
the aim to optimize the control of properties such as workability as a function of time[3].
According to the obtained results, develop the properties of self-flowing castables are under
effect of several item such as: the Andreasen coefficient, the percentage of silica fume, the…

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