About Studies

Research Report in 2015

Study of functional ceramics by using laminated printing technology

Yasuyuki TSUTSUMI
Saga Ceramics Research Laboratory
New glaze seal using the transfer printing technology was developed for enhancing the functionality and design quality of porcelain. The glaze seal prepared by using aqueous polymer as forming agent could adhere with biscuit body. Effect of stress enhancement in the glaze layer on the bending strength by lamination was not observed. On the other hand, aprecise design pattern was printed successfully by using this new glaze seal. This glaze seal printing technique is very useful in decoration of porcelain, and it will contribute to develop new and novel porcelains.



Development of direct internal reforming SOFC running on methane fuel
derived from biogas


Sachiko FURUTA1,Yusuke SHIRATORI2
1Saga Ceramics Research Laboratory
2Faculty of Engineering,Department of Mechanical Engineering Science,Kyushu University
In the direct feeding of biogas to SOFC system, endothermic reaction of gas reforming causes strong temperature gradient, which results in fracture of the cell. In this study, we investigated the effect to reduce temperature gradient by coating inert layer for the reforming reaction on NiO-YSZ anode in the direct internal reforming SOFC running on biogas. Temperature gradient of the cell was reduced by coating of inert layer with several patterns. And it is found that temperature control of the entire cell can be performed by changing the proportion of coating area occupied on the anode surface. Constant current operation using the cell coated with inert layer succeeded for 100 hours under supplying simulated biogas.



Development of the heat sink materials with the oriented ceramic perticles

Akihiko KAWAHARA
Saga Ceramics Research Laboratory
The composite materials produced by mixing of a resin and oriented ceramics filler are expected to solve some thermal issues derived from heat in the electronic device. In this study, two new mixing methods to orient ceramic filler in a resin were proposed and investigated using a scale-like boron nitride (h-BN) and silicone. One is a potting method and second is a rotation and revolution method based on the good flow property of silicone. In the case of a rotation and revolution method, 60% of h-BN filler could be incorporated in silicone by the addition of a diluent, and the orientation of filler was improved. The thermal conductivity of the composite reached around 3W/m・K.



Properties of gray-white colored sedimentary clay mined at a western
Arita(Sotoyama) area


Hiroaki KATSUKI
Agriculture, Forestry, Fisheries & Commerce Head Office, Saga Pref. Gov.
In this paper, mineral and chemical composition, particle size and sintering properties of sedimentary clay with gray-white color mined from around one meter of depth at a western Arita was investigated. Fine clay powder of 2.6μm of average particle size and coarse particles with quartz and feldspar of 30 - 380μm were collected by using a conventional elutriation in water. Collection yield of fine clay powder was 44%. Amount of Fe2O3 and TiO2 in the clay was 1.1-1.4 and 0.6-0.7mass%, and the clay was composed of quartz(38.2), platy kaolin(20.8), Na-feldspar(12.2)muscovite(28.8mass%), respectively. The clay with kaolin and muscovite had a high plasticity and made a wheel formation easy. The formed clay product was partially deformed over 1250℃ firing due to the higher content of Na2O+K2O in the clay.
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