2022 Fiscal Year Research-status Report
Material design to realize fine geometries porcelain with large, thin, and precise shape
| Project/Area Number |
21K12901
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| Research Institution | Saga University |
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Principal Investigator |
HAO DONG 佐賀大学, 肥前セラミック研究センター, 助教 (80868810)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | Strengthened pottery / Wollastonite / Anorthite / Near-zero / Sintering shrinkage / Liquid sintering / Pytoplastic deformation |
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| Outline of Annual Research Achievements |
We defined the standards for near-zero sintering shrinkage pottery (NZS) fired -1300 degrees based on expert suggestions, as follows: i) sintering shrinkage (SS) of <2.0%; ii) pyroplastic deformation index (PI) of <1.5×10-6 mm-1.
Then, we analyzed the thermal mechanical properties and phase composition of NZS. The sintering shrinkage of NZS stops at 1100～1200 degrees due to anorthite crystallization, confiremed by high-temprature XRD. After analyzing the phase composition of the pottery fired at 1200 degrees and the pottery with SS <2.0% fired at 1300 degrees, respectively, phase composition criteria of NZS was established, and the suppressing mechanism was clarified.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The most important issue of this study is to find strategies to suppress sintering shrinkage and pyroplastic deformation, identify key factors for achieving high-precision ceramic fabrication, and clarify their mechanisms. So far, all of these have been accomplished. We have prepared a series of potteries with near-zero sintering shrinkage and small pyroplastic deformation by adding wollastonite and alumina to pottery made from Amakusa clay in the firing tempreature ～1300 °C. These efforts have made it possible to prepare earthenware, stoneware, unglazed porcelain and ceramic tiles with precise dimension and geometry. Additionally, we have evalute the strength of some prepared potteries and tried to improve both the strength and toughness using the zirconia addition.
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| Strategy for Future Research Activity |
We will try to further improve the strength and toughness of the near-zero sintering shrinkage potteries, and try to provide our developed materials for high-precision potteries making this year.
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| Causes of Carryover |
Because of the freeze dryer maintenance, raw materials and consumables related to the strengthening porcelain will be purchased in the next fiscal year. Expenses for the publication of paper will be paid in the next fiscal year,too.
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