An investigation of sodium silicate added malaccan red clay for slip casting process
The development of local pottery industries in any area is dependent on the availability of a high quality local clay resource. This study explores the possibility of using Malaccaoriginated clay to replace Sayong clay in producing ceramic pottery using slip casting technique. Red clay from Kampu...
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| Format: | Thesis |
| Language: | English English |
| Published: |
2014
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| Subjects: | |
| Online Access: | http://eprints.utem.edu.my/id/eprint/14711/1/An%20Investigation%20Of%20Sodium%20Silicate%20Added%20Malaccan%20Red%20Clay%20For%20Slip%20Casting%20Process%2024%20pages.pdf http://eprints.utem.edu.my/id/eprint/14711/2/An%20investigation%20of%20sodium%20silicate%20added%20malaccan%20red%20clay%20for%20slip%20casting%20process.pdf http://eprints.utem.edu.my/id/eprint/14711/ https://plh.utem.edu.my/cgi-bin/koha/opac-detail.pl?biblionumber=92185 |
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| Summary: | The development of local pottery industries in any area is dependent on the availability of a
high quality local clay resource. This study explores the possibility of using Malaccaoriginated
clay to replace Sayong clay in producing ceramic pottery using slip casting
technique. Red clay from Kampung Sungai Petai, Malacca (Malaccan red clay) is selected as a
raw material due to close vicinity of the resource to KKTM Malacca. The Malaccan red clay
was characterized in term of mineralogy and chemical composition by using X-Ray
Diffraction machine and Energy Dispersive X-Ray Fluorescence machine. The optimization of
the dispersant dosage (Sodium silicate, Na2Si03) varying from 0.20% wt. to 0.40% wt of total
raw material powder was determined by the agglomeration measurement size and
sedimentation test. Then the study is continued with the determining optimum solid loading.
Slurry with solids loadings of 60%, 65%, 70%, 75% and 80% by weight was determined by
viscosity and the casting rate measurement. After that, test bar was cast by using slurry with
the optimum dispersant dosage and the optimum solid loading. The test bar was fired at
temperatures of 1100, 1150, 1200, 1250, 1300 and l 350°C and then underwent physical
analyses according to the specific ASTM standard. Optimum sintering temperature on test
samples was determined by water absorption and firing shrinkage measurement. Optimum
dispersant dosage was 0.30 wt %. Optimum solid loading was determined at 75% wt indicated
by viscosity reading below and near to l Pa.s and the highest casting rate value with good
cosmetic appearance. Optimum sintering temperature is at 1250°C identified by its maximum
linear shrinkage. Malaccan red clay contains high percentage of hematite (Fe20 3), and red
colour comes from iron inside the mineral so it should categorize in red clay classification.
Apart from hematite phase, characteristic peaks of quartz, mullite, kaolinite and
montmorillonite were identified. Occurrences of kaolinite and montmorillonite act as a body
of the ceramic products, however quartz and mullite as a filler and little fluxing agent exist
such as elements of K10 and Na20 . By all ingredients, so definitely this clay can be made as
an independent raw material for producing ceramic products without added others filler and
fluxing agents. Malaccan red clay also has ability to disperse well after added with sodium
silicate and has low enough viscosity with high solids loading which are very important
criteria in slip casting process. It also has a reasonable matured temperature and suitable for
the manufacture of terra cotta products. With all of the investigation, sodium silicate added
Malaccan red clay is suitable for slip casting process. |
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