000			02644nam a22001817a 4500
003			OSt
005			20240910085311.0
008			240910b |||||||| |||| 00| 0 eng d
040			_aMMSU _cULS
100			_aAbellon, Marie Antoinette A.
245			_aDevelopment and evaluation of terra sigillata slip utilizing San Nicolas clay and rice hull Silica- based deflocculant for local ceramic wares / _cMarie Antoinette A. Abellon
260			_aCity of Batac : _bMMSU, _c2024.
300			_axix, 69 leaves : _c29 cm.
500			_aUTHESIS (Bachelor of Science in Ceramic Engineering)
504			_aBibliography: leaves 50-51
520			_aCommon 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.
942			_2lcc _cTHEDIS
999			_c23509 _d23509