Preparation and Characterization of Ceramic Bodies based on Some Phosphate containing Wastes
Nihal Ahmed Mohamed Tawfik El-Mahalawy;
Abstract
This work aimed to study the recycling of fish bone
ash by using it in the manufacturing of stoneware tiles
and bone china bodies. In addition, studying the effects of
addition of fish bone ash by measuring the physical,
mechanical and thermal properties of sintered tile bodies.
Three different groups were designed; each
comprised four batches to satisfy the aim of the thesis.
Group one was designed in order to study the effect of
substitution of Hafafit feldspar for bone ash. While in
group two, the effect of weathered feldspar substitution
for Hafafit feldspar was shown. And group three was
designed to study the possibility of manufacturing bone
china bodies based on fish bone ash.
Results of the first group showed that the addition
of more than 10 mass-% fish bone ash accelerated the
formation of anorthite phase and hindered the formation
of mullite in sintered tiles. Partially replacement of potash
feldspar by fish bone ash resulted in lowering of the
thermal expansion than conventional tiles and displayed
greater porosity and reduced bulk density as their fish
bone ash content increased.
ABSTRACT
ix
The study demonstrated that the microstructure and
technological properties of the tiles containing fish bone
ash are strongly affected by the fish bone ash content.
A decrease in bending strength, attributed to
greater porosity and lower quartz content, was observed
as fish bone ash content increased more than 10 masspercent.
Substitution of Hafafit feldspar by weathered
feldspar increased the bulk density of the tile samples and
shortened the firing range of the samples. Samples based
on weathered feldspar are composed mainly of anorthite,
mullite and quartz and possessed relatively low thermal
expansion coefficient due to its content of silicate glassy
phase and improved mechanical properties due to low
porosity.
The bone china fired bodies are composed of
anorthite, ß- tricalcium phosphate and quartz.
Identification of mullite was very difficult in the fired
samples. The addition of feldspar on the expense of bone
ash in the bone china bodies has a negative effect on the
bodies’ whiteness and translucency.
ash by using it in the manufacturing of stoneware tiles
and bone china bodies. In addition, studying the effects of
addition of fish bone ash by measuring the physical,
mechanical and thermal properties of sintered tile bodies.
Three different groups were designed; each
comprised four batches to satisfy the aim of the thesis.
Group one was designed in order to study the effect of
substitution of Hafafit feldspar for bone ash. While in
group two, the effect of weathered feldspar substitution
for Hafafit feldspar was shown. And group three was
designed to study the possibility of manufacturing bone
china bodies based on fish bone ash.
Results of the first group showed that the addition
of more than 10 mass-% fish bone ash accelerated the
formation of anorthite phase and hindered the formation
of mullite in sintered tiles. Partially replacement of potash
feldspar by fish bone ash resulted in lowering of the
thermal expansion than conventional tiles and displayed
greater porosity and reduced bulk density as their fish
bone ash content increased.
ABSTRACT
ix
The study demonstrated that the microstructure and
technological properties of the tiles containing fish bone
ash are strongly affected by the fish bone ash content.
A decrease in bending strength, attributed to
greater porosity and lower quartz content, was observed
as fish bone ash content increased more than 10 masspercent.
Substitution of Hafafit feldspar by weathered
feldspar increased the bulk density of the tile samples and
shortened the firing range of the samples. Samples based
on weathered feldspar are composed mainly of anorthite,
mullite and quartz and possessed relatively low thermal
expansion coefficient due to its content of silicate glassy
phase and improved mechanical properties due to low
porosity.
The bone china fired bodies are composed of
anorthite, ß- tricalcium phosphate and quartz.
Identification of mullite was very difficult in the fired
samples. The addition of feldspar on the expense of bone
ash in the bone china bodies has a negative effect on the
bodies’ whiteness and translucency.
Other data
| Title | Preparation and Characterization of Ceramic Bodies based on Some Phosphate containing Wastes | Other Titles | :تحضير وتىصيف بعض الاجسام السيراهيكيت القائوت عل هخلفاث هحتىيت عل الفىسفاث. | Authors | Nihal Ahmed Mohamed Tawfik El-Mahalawy | Issue Date | 2015 |
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