Surface tension and wettability between silicon nitride of RE 2O3-MgO-SiO2 (RE = Y, Gd, Nd and La) melts

Hirofumi Tokunaga, Satoru Ideguchi, Fumiyuki Shimizu, Noritaka Saito, Kunihiko Nakashima

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The effect of RE2O3 (RE = Y, Gd, Nd, and La) additives on the surface tension of 45.2MgO-54.8SiO2 (mol%) melts have been investigated using the ring (detachment or maximum pull) method. Furthermore, the wettability of RE2O3-MgO-SiO2 melts between the silicon nitride polycrystalline substrate is determined using the sessile drop method. The surface tension of RE2O 3-MgO-SiO2 melts were found to increase with the content of any rare-earth additions, which suggests that a rare-earth oxide behaves as a network modifier of the complex silicate anions in high temperature melts. The surface tension increased in the order of the cationic radius of rare-earth oxides as follows: Y2O3<Gd2O 3<Nd2O3La2O3. The contact angle of RE2O3-MgO-SiO2 melts against the silicon nitride substrate rapidly decreased with the annealing time at 1723 K; after annealing for 50 min, the contact angle remained constant. The contact angle and the penetration depth of melts into the substrate increased in the order of the cationic radius of rare-earth oxides as follows: Y 2O3<Gd2O3<Nd2O 3<La2O3.

Original languageEnglish
Pages (from-to)445-451
Number of pages7
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Issue number5
Publication statusPublished - May 1 2007


All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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