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Nimit Sriprang ¹, Jutatip Namahoot ¹, Patsorn Para ¹, Wanatee Kholam ¹, Anongnat Duangchuen ¹, Watchrawit Uarsilp ¹

Affiliations
1 Department of Chemistry, Faculty of Science, Naresuan University, Phitsanulok, TH

Abstract

Objectives: To study the effect of Zn powder content (0-40 wt%) on low firing metallic composite glaze on earthenware fabricated at 1100°C under oxidizing and partially reducing firing atmosphere. Methods/Statistical Analysis: The raw glaze was characterized by TGA-DSC. The fired glaze was characterized by XRD (X-Ray Diffraction) and SEM (Scanning Electron Microscopy). The chemical resistance and water contact angle of fired glaze were also investigated. Findings: The glaze made with 10% Zn powder has green color and some dark green stripes of CuO and Fe2O3 in oxidizing firing atmosphere. Contrary, the glaze has shiny violet-green aspect of the mixture of the deep blue color of FeO and CuO, and some Zn metallic luster after firing in a reducing atmosphere. The glazes appear has rough surfaces with the greenish brown color. when more Zn powder is added (20-40 wt%) by firing in an oxidizing atmosphere, light brown and opaque appearance is observed after firing in partially reducing conditions. This was attributed to the formation of Fe3O4. The shiny crystals of Zn2SiO4 and a small amount of metallic Zn are formed in the fired glaze prepared in reducing atmosphere. The fired glaze surface can be corroded by both acidic and basic solutions. Finally, the fabricated fired glaze surface is easyto- clean with water contact angle of ≈56°. Application/Improvements: These results could be applied to the local clay earthenware for luster decoration providing an added value to the products.

Keywords

Low Firing, Oxidizing Atmosphere, Partially Reducing Atmosphere, Tapoh Clay, Zn Metallic Composite Glazes.

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Jariya Baosaree ¹, Nattanicha Rakharn ¹, Darawadee Kammee ¹, Patcharapong Pengpajon ¹, Suntiphap Sriaphai ¹, Suttida Sittijanda ¹, Unthika Naudom ¹, Nimit Sriprang ¹, Jutatip Namahoot ¹, Sumrit Mopoung ¹

Affiliations
1 Department of Chemistry, Faculty of Science, Naresuan University, Phitsanulok, TH

Abstract

Objectives: Sintered porous clay for possible as a water filter was fabricated from clay and zeolite mixtures (50:50 ratio weight by weight) with adding of rice husk charcoal as porous template. Methods/Statistical Analysis: The effect of particle size (<88 μm, 88-250 μm, and >250 μm) and amount (25, 35, and 50 wt%) of rice husk charcoal and sintering temperature (800, 900, and 1000°C) for linear shrinkage, density, water absorption, compressive strength, and functional groups on sintered mixture clays were investigated. The FTIR and SEM were also used for characterization of sintered porous clays. Findings: The results showed that the water absorption and the open porosity increased with increasing amount and size of rice husk charcoal, while the density and compressive strength decreased. However, these properties are inverse as increasing of sintering temperature from 800 to 10000C. The results of FTIR and SEM confirmed occurring of glassy form, high open porosity and macropore in sintered mixture clays. The study results could be concluded that the mixtures of rice husk charcoal and clays with ratios 25 wt% rice husk charcoal for <88 - >250 μm size : 37.5 wt% Thapo clay : 37.5 wt% zeolite at 800-1000 °C sintering temperature are suitable for water filter fabrication with values of 30.44-42.80 %porosity and 3349.94-4629.66 kN/m² of compressive strength. Application/ Improvements: Rice husk charcoal was used as template for water filter fabrication at 800-10000C sintering temperature which values of porosity and compressive strength are according to traditional water filter manufacture standards..

Keywords

Porous Ceramic, Rice Husk Charcoal, Thapo Clay, Water Filter, Zeolite

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