Synthesis of single phase La2Zr2O7 by wet mechanochemical treatment

Maria Ophelia D. Jarligo, Yan Sheng Kang, Akira Kawasaki, Ryuzo Watanabe

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Powders of La2O3 and ZrO2 in ethanol based suspension were used as precursor materials for the wet mechanochemical (MC) synthesis of single phase La2Zr2O7, a promising thermal barrier coating (TBC) material. Lanthania powder was first preheated at 1200°C prior to MC treatment in a planetary ball mill at 200, 300 and 400 revolutions per minute (rpm) milling speeds for 12, 18, and 24 hours using zirconia pot and balls. The slurries were then dried at 110°C for 24 hours in an oven followed by heat treatment at 1500°C for 1 hour. X-ray diffraction results showed that single phase La2Zr2O 7 was produced using 5mm ball at 200 rpm milling for 12 hours and using 10mm balls at 400 rpm for 24 hours. Smaller grinding balls and slower milling speed allowed more homogeneous mixing during wet mechanochemical treatment in a 250 mL milling pot. The average particle size of the products is lower than 1.8 μm. The yield of powder is greater than 98%.

Original languageEnglish
Pages (from-to)2634-2637
Number of pages4
JournalMaterials Transactions
Volume45
Issue number8
DOIs
Publication statusPublished - 2004 Aug

Keywords

  • Lanthanum zirconate
  • Mechanochemistry
  • Planetary milling
  • Thermal barrier coating

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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    Jarligo, M. O. D., Kang, Y. S., Kawasaki, A., & Watanabe, R. (2004). Synthesis of single phase La2Zr2O7 by wet mechanochemical treatment. Materials Transactions, 45(8), 2634-2637. https://doi.org/10.2320/matertrans.45.2634