PREPARATION OF CERAMIC...
Transcript of PREPARATION OF CERAMIC...
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PREPARATION OF CERAMIC POWDERS
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Fine Ceramic Powders for Sintering Mainly
‘Building-up’ processes
‘Breaking-down’ processes
Comminution and classification - powders by grinding and milling of row
materials that are either natural in origin or a natural mineral after thermal
decomposition or materials synthesised in ‘building-up’ processes
Ceramic Powders for Other Applications
Sol-gel processing of colloids – nuclear industry, liquid chromatography, abrasives
Melt solidification – abrasives
Ceramic Fibres Manufacture
Blow-spin process
Extrusion or draw process
Crystallization method
Vapour-phase routes (CVD)
Chemical transformation of precursor fibre
Unusual methods – ceramic cutting; directional freezing of gels
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I Solid-Phase Synthesis
Introduction
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Oxidation Reactions
Reduction Reactions
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SiO2(s) + 2H2(g ) Si(s) + 2H2O(g)
Nitridation Reactions
Liquid-Solid Reactions
Solid-Solid Reactions
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II Liquid Phase Synthesis
Precipitation Technique
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5 mol.% CaO-ZrO2 powders calcined at indicated temperatures.
CM/CN – 3 mol % Y2O3-ZrO2 powder calcined at 950oC, 3Y-TOSOH – commercial calcined
zirconia powder,, MG - 5 mol.% CaO-ZrO2 powders calcined at 600oC, 6N – 6 mol % CaO-
ZrO2 powder hydrothermally crystallized at 240oC.
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Hydrolysis Technique
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Solvent Evaporation Technique
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Citrate Gel Process
Hydrothermal Crystallization
Crystallisation conditions such as crystallisation environment,
its pH, temperature and pressure controls the particle size and
shape.
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III Vapour-Phase Synthesis
Principle of Powder formation by CVD Technique
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Electric Furnace Method
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Plasma method
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Laser Method
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Spray Drying
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FACULTY OF MATERIALS SCIENCE AND CERAMICS
UNIVERSITY OF SCIENCE AND
TECHNOLOGY
THERORY AND PRACTICE
OF CERAMIC PROCESSES
Lecture III/IV
W.Pyda