Strengthening of alumina-strengthened porcelain made of Amakusa clay

• Project/Area Number: 18K04753
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 26040:Structural materials and functional materials-related
• Research Institution: Saga University
• Principal Investigator: AKATSU Takashi 佐賀大学, 芸術地域デザイン学部, 教授 (40231807)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: 磁器 / アルミナ / 強度 / 応力 / 亀裂発生 / 焼成変形 / 熱膨張率 / 強化磁器 / 残留応力

Outline of Final Research Achievements

We have revealed that strengthening of alumina strengthened porcelain is owing to, 1: Compressive prestress on porcelain matrix, and 2: Prevention of microcracking around quartz grains due to the addition of alumina particles with large thermal expansion coefficient. The validity of the prestress estimated with micromechanics calculation is confirmed by the prestress measurement with raman scattering spectroscopy. In the case of other porcelain containing alumina particles, the strength of porcelain is basically controlled by the amount of residual alumina particles in fired porcelain.

Academic Significance and Societal Importance of the Research Achievements

アルミナ強化磁器の強化メカニズムを明らかにしたことにより、その強化メカニズムに基づいて新たな強化磁器を材料設計することが可能となった。

Research Products

• [Journal Article] Flexural strength of alumina-strengthened porcelain with both small water absorption and small pyroplastic deformation (2021)
  • Author(s): Takashi AKATSU, Dong HAO, Anna HUBAREVICH and Katsumi YOSHIDA
  • Journal Title: Journal of the Ceramic Society of Japan Volume: 129 Issue: 3 Pages: 195-199
  • DOI: 10.2109/jcersj2.20213
  • NAID: 130007993751
  • ISSN: 1348-6535, 1882-0743
  • Year and Date: 2021-03-01
  • Peer Reviewed / Open Access
• [Journal Article] Prestress in alumina-strengthened porcelain as estimated with Raman scattering spectroscopy (2021)
  • Author(s): Takashi AKATSU, Masashi UNNO and Tomotsumi FUJISAWA
  • Journal Title: Journal of the Ceramic Society of Japan Volume: in press
  • Peer Reviewed / Open Access
• [Journal Article] Strengthening in porcelain reinforced with alumina particles (2020)
  • Author(s): Takashi AKATSU, Miho TOMIYASU, Takahito SHINGAE and Nobuaki KAMOCHI
  • Journal Title: Journal of the Ceramic Society of Japan Volume: 128 Issue: 12 Pages: 1045-1054
  • DOI: 10.2109/jcersj2.20143
  • NAID: 130007949049
  • ISSN: 1348-6535, 1882-0743
  • Year and Date: 2020-12-01
  • Peer Reviewed / Open Access
• [Journal Article] Evaluation of the water absorption and pyroplastic deformation of alumina-strengthened porcelain with talc-addition (2020)
  • Author(s): HAO Dong、AKATSU Takashi、KAMOCHI Nobuaki
  • Journal Title: Journal of the Ceramic Society of Japan Volume: 128 Issue: 4 Pages: 194-200
  • DOI: 10.2109/jcersj2.19211
  • NAID: 130007825757
  • ISSN: 1348-6535, 1882-0743
  • Year and Date: 2020-04-01
  • Peer Reviewed
• [Presentation] アルミナ強化磁器はなぜ強いのか？ (2021)
  • Author(s): 赤津 隆、蒲地伸明
  • Organizer: 日本セラミックス協会 2021年年会
• [Presentation] アルミナ強化磁器の強化機構 (2020)
  • Author(s): 赤津 隆、蒲地伸明
  • Organizer: 日本機械学会 2020年度年次大会
• [Presentation] Suppression of the pyroplastic deformation of alumina-strengthened porcelain with talc addition (2019)
  • Author(s): AKATSU, Takashi, HAO, Dong, KAMOCHI Nobuaki
  • Organizer: The 11th Asian Ceramic Materials Symposium
  • Int'l Joint Research
• [Presentation] Exploring the influence of talc on the water absorption and pyroplastic deformation of alumina strengthened porcelain (2019)
  • Author(s): HAO, Dong, AKATSU, Takashi, KAMOCHI Nobuaki
  • Organizer: The 13th pacific Rim Conference of Ceramic Societies
  • Int'l Joint Research