Development and evaluation of terra sigillata slip utilizing San Nicolas clay and rice hull Silica- based deflocculant for local ceramic wares / Marie Antoinette A. Abellon
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TextPublication details: City of Batac : MMSU, 2024Description: xix, 69 leaves : 29 cmSummary: Common issues on local ceramic wares are its rough and dull surface finish appearance. Yet, these appearances can be enhanced by applying a glaze-like slip coating called terra sigillata slip (TSS). In this study, a TSS was developed utilizing San Nicolas clay and rice hull silica-based deflocculant and evaluated as coating for local ceramic wares. The primary material which is clay was obtained from San Nicolas and the deflocculant was a locally prepared rice hull silica-based using sodium silicate solution. The clay profile and chemical composition were measured by sedimentation method and XRF analysis techniques, respectively. The TSS was prepared by mixing superfine San Nicolas clay with deflocculant and water, settled in two hours, siphoned the top one-third layer, and controlled the specific gravity to 1.15. Two different local clay mixtures (San Nicolas pottery – 2:1 farmland/river sand, wt. %; processed and formulated – 95:5 clay/rice hull ash, wt. %) were prepared as substrates. The substrates were coated with TSS by brushing method, finished, oven dried, and fired at 900°C for one hour. Linear shrinkage, surface appearance, and fit of the substrates and TSS coating including the thickness were evaluated. The XRF analysis revealed that SiO2, Al2O3, Fe2O3, and some light elements were the dominant oxides present in the clay. Further, the sedimentation test revealed that San Nicolas clay is a clay type with ~45.03 wt.% clay based on profile. Both prepared local specimens resulted in a significant improvement on the surface appearance, particularly, showcased a noticeable sheen and evident sealed cracks. The coating adhered well to the substrates, indicating good compatibility. The coating thickness was around 8.42 - 9.79 µm which confirmed that the TSS is a very thin coating. Thus, this developed TSS has potential to improve the quality of locally produced ceramic wares which may lead to promising higher markets.
| Item type | Home library | Shelving location | Call number | Status | Notes | Date due | Barcode |
|---|---|---|---|---|---|---|---|
| Thesis/Dissertation | MMSU Main Library | Theses and Dissertation Section | Available | Room Use Only | UTHESIS-6944 |
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UTHESIS (Bachelor of Science in Ceramic Engineering)
Bibliography: leaves 50-51
Common issues on local ceramic wares are its rough and dull surface finish appearance. Yet, these appearances can be enhanced by applying a glaze-like slip coating called terra sigillata slip (TSS). In this study, a TSS was developed utilizing San Nicolas clay and rice hull silica-based deflocculant and evaluated as coating for local ceramic wares. The primary material which is clay was obtained from San Nicolas and the deflocculant was a locally prepared rice hull silica-based using sodium silicate solution. The clay profile and chemical composition were measured by sedimentation method and XRF analysis techniques, respectively. The TSS was prepared by mixing superfine San Nicolas clay with deflocculant and water, settled in two hours, siphoned the top one-third layer, and controlled the specific gravity to 1.15. Two different local clay mixtures (San Nicolas pottery – 2:1 farmland/river sand, wt. %; processed and formulated – 95:5 clay/rice hull ash, wt. %) were prepared as substrates. The substrates were coated with TSS by brushing method, finished, oven dried, and fired at 900°C for one hour. Linear shrinkage, surface appearance, and fit of the substrates and TSS coating including the thickness were evaluated. The XRF analysis revealed that SiO2, Al2O3, Fe2O3, and some light elements were the dominant oxides present in the clay. Further, the sedimentation test revealed that San Nicolas clay is a clay type with ~45.03 wt.% clay based on profile. Both prepared local specimens resulted in a significant improvement on the surface appearance, particularly, showcased a noticeable sheen and evident sealed cracks. The coating adhered well to the substrates, indicating good compatibility. The coating thickness was around 8.42 - 9.79 µm which confirmed that the TSS is a very thin coating. Thus, this developed TSS has potential to improve the quality of locally produced ceramic wares which may lead to promising higher markets.
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