Journal of the Thai Ceramic Society

Application of Soda-Lime-Silica Cullet as a Fluxing Component in a Vitreous China Ware Casting Body

2024-09-09T10:45:31+07:00

This study explores the potential of using ground container glass cullet as a partial or complete replacement for feldspar in vitreous sanitary ware casting bodies. Developed bodies, fluxed partially and fully with glass, were evaluated for their casting characteristics and physical fired properties. The results indicate that slips containing glass powder responded strongly to deflocculants, while most casting properties were satisfactorily maintained. As an auxiliary flux, glass powder increased vitrification in the feldspar-fluxed formula and lowered the maturing temperature. However, excessive glass addition led to a shortened firing range. Complete replacement of feldspar with glass powder is not feasible without increasing the proportion of refractory materials, such as kaolin and flint, in the mixture. This adjustment allows for the inclusion of up to 7.5% glass powder. The reformulated glass-fluxed composition, which retained key characteristics, demonstrated potential as a viable alternative to feldspar-fluxed compositions, exhibiting similar forming and firing behavior. XRD and SEM analyses revealed the presence of various phases and microstructures, particularly cristobalite and mullite, which were associated with certain macrostructural properties.

Development of cordierite-mullite refractory castables bonded with magnesium silicate hydrate cement

2024-09-29T21:27:50+07:00

Cordierite-mullite refractory materials are widely used as kiln furniture in the ceramic industry due to their excellent thermal shock resistance and high mechanical strength at elevated temperatures. Cordierite-mullite ceramics possess excellent mechanical strength and thermal shock resistance, making them well-suited for kiln furniture. This research explores the development of cordierite-mullite refractory castables using a magnesium silicate hydrate (MSH) cement as a novel bonding system. Castables were prepared with varying molar ratios of MgO to SiO₂ (0.75 to 4) and characterized for their physical, mechanical, and thermal properties. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses revealed the formation of MSH cement phase at room temperature, which decomposed upon firing to form spinel and ultimately cordierite at high temperatures. The optimal MgO to SiO₂ molar ratio of 1 yielded the best physical properties, including a modulus of rupture of 13.41 MPa after sintering at 1350 °C, bulk density of 2.01 g/cm³, porosity of 22.45%, and thermal expansion coefficient of 2.59 x 10^-6°C^-1. The microstructural evolution showed the transformation from loosely bound particles in the green state to a well-sintered cordierite matrix embedding mullite aggregates after firing. The developed castables exhibited properties comparable to commercial cordierite-mullite kiln furniture, demonstrating their potential as a viable option for high-temperature ceramic applications.

Characteristics and water permeability of pervious materials made from electric arc furnace steel slag

2024-10-04T22:55:38+07:00

A pervious material is a concrete-based perforated material that can effectively drain water according to its porous structure. The outstanding features of the structure include a large fraction of open and connected pores, allowing good water permeability. This research focused on the use of electric arc furnace (EAF) slag waste from the steel industry as a raw material to produce pervious concrete. This aimed to observe the relationship between properties and microstructure of the slag-based porous bodies, i.e. compressive strength, water permeability and porosity. The cast specimens were prepared as slag-cement mixtures containing 2 different median sizes of the crushed EAF slag, the particle sizes of which were 5-12 mm (M) and 12-20 mm (L). The mixtures with various EAF slag size, L:M ratio of 100:0, 75:25, 50:50, 25:75 and 0:100 by weight, were blended with ordinary Portland cement and water. After demolding and water curing for 1 day, the as-cast were further cured for 3, 7, 14 and 28 days. Compressive strength, density, porosity and water permeability were determined. The experimental results showed that the compressive strength was greater as a function of curing time. The change in EAF slag size ratio significantly affected the strength. Strength and water permeability were truly related to pore characteristics. The water flow rate might not be solely based on pore fraction in the bodies but also depended on the connectivity and the size of the pore. Therefore, the next step of the research should cover the connectivity of pore structure.

Research on Ratchaburi Local Fabric for Design Glass Tile for Decoration to Promote Identities Perception

2025-01-27T12:41:35+07:00

“Research on Ratchaburi Local Fabric for Design Glass Tile for Decoration to Promote Identities Perception” aims to 1) collecting and analyzing the properties, characteristics, and identities of local fabrics 2) to design works of art and crafts that promote the identity of Ratchaburi 3) to design works of art and crafts that promote the identity of Ratchaburi and 4) to use the design for the foundation of the development and occupation of the people of Ratchaburi. The researcher has studied concepts, theories, artistic styles, wisdom, culture and concept of image relationships in aesthetic design. Relationship of free space to applicated in design. Including reviewing related policy plans. After that, the researcher produced a data collection tool. To analyze the attitude and behavior of area users. Before use it to create a prototype glasses sheet for decoration in a various type, size, and design more than 20 works.

Ceramic Craft: Inspiration by Thaitone Colours

2025-02-12T15:38:32+07:00

Creating handicraft ceramics: inspired by the color tones of Thailand. want to design and creating
porcelain works in the style of Pottery Arts. By taking inspiration from the color tones of Thailand to design
and create works according to the imagination of the researcher. Using the principle of doing less, getting
more (Less is More) in designing to make the work contemporary. The results of the research found that
impressive works can be created from woven fabric patterns, such as Mudmee fabric patterns and Khit fabric
patterns, designed together with simple container shapes following the principle of doing less, doing more.
Using Thai color tones obtained from experiments mixing spinel pigments mixed with slip and selected colors
to be tested mixed with ready-made undercoat paint. to create a variety of colors Following the example of
the ancient Thai method of mixing color tones to decorate containers with the technique of decorating patterns
under the glaze. which can create a total of 3 sets of works. According to the type of soil These are porcelain,
stoneware, and earthenware. The workpiece is formed using a rotating wheel molding method and slip
casting and coated with a ready-made clear coating. Burned according to the temperature level of the soil,
which is: Earthenware is fired at a temperature of 1200-1220 degrees Celsius. and porcelain burned at a
temperature of 1250 degrees Celsius, which allows the researcher to create works that are consistent with
the set objectives of the project