Study the Effect of Glass and Carbon Fibers on the Firebrick
Properties |
This
work was carried out to investigate effect of glass fiber (GF)
and carbon fiber (CF) on kaolin-clay firebrick properties. GF
and CF are considered inorganic fibers with application of high
temperatures. Kaolin clay is mixed with short GF and CF
separately by different percentages (0, 0.5, 1, 1.5 and 2) wt%.
Kaolin-GF and kaolin-CF mixtures were compacted by using the
semi-dry pressing method. The compacted specimens were fired at
different temperatures (1100, 1200 and 1300)°C. Properties which
include bulk density, apparent porosity, water absorption,
thermal conductivity and fracture strength were obtained from
the firebrick specimens. The results show that the addition of
GF has beneficial in lowering of firing temperature, and
consequently accelerating the densification via enhanced grain
boundary diffusivity. Increasing GF content in the firebrick
mixture enhances the fracture strength due to increase amount of
glassy and mullite phases. Incorporation of CF has inversely
affected than GF on the firebrick properties. As the percentage
of CF increased the density of firebrick decreased, and the
porosity and water absorption increased. |
|