جۆری توێژینهوه : Original Article
نوسهران
1 Department of Physics, College of Science, University of Diyala, Diyala, Iraq.
2 Applied Science Department, University of Technology, Baghdad, Iraq.
پوخته
In this work, physical phenomena related to the growth and phase formation of alumina
powder are investigated by experiments and computer calculations. The specimens were formed
by slip casting technique. These specimens were fired at various temperatures (500, 1100 and
1600) °C. Alumina samples with different dopant percentages were prepared to study their
various physical and mechanical properties. Before casting, slurries with (60 wt. %) solid content
and different percentages of dopant additions were prepared. The dopant used here is kaolinite
with (0, 5, 10 and 15) percentage addition, where kaolinite is one of many types of raw materials
that have plasticity and advantage of securing. Sodium carboxymethylcellulose (Na-CMC)
solution was used as dispersant. The stability of the slip clearly depends on the percentage of
dispersant added and the best ratio is found to be (0.33 ml) for each gram of solids. Kaolinite
percentage increase leads to decreasing the porosity and water absorption but it leads to increase
density, thermal conductivity and all the mechanical properties.
وشه بنچینهییهكان
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