Journal of Inorganic Materials, Volume. 36, Issue 4, 443(2021)

HfN Formation and Phase Relationships in the Hf-Si-La-O-N System

Yang LIU... Youjun LU*, Yanrui LI, Liqun LIN, Zhenxia YUAN and Zhenkun HUANG |Show fewer author(s)
Author Affiliations
  • School of Materials Science and Engineering, North Minzu University, Yinchuan 750021, China
  • show less

    In this study, the synthesis is feasibility and formulation design of HfN composite lanthanum silicate ceramics were explored. The feasibility of HfN synthesis by ternary reaction of HfO2-Si3N4-La2O3 system was verified by experiments, and the relationship between reaction pathway of HfO2-Si3N4 binary system and Hf-Si-La-O-N was studied. Considering that the lanthanum silicate salt in the reaction of HfO2-SiO2-La2O3 ternary system was contained in the Si3N4-SiO2-La2O3 system, lanthanum silicate was extended to the HfO2-Si3N4-La2O3-SiO2-HfN (Hf-Si-La-O-N) system, which clarified the coexistence of HfN and the lanthanum salt phases in the system. Experimental phase diagrams of HfO2-SiO2-La2O3 ternary system and Hf-Si-La-O-N system at 1500 ℃ were proposed. The results show that intermediate product Hf7O8N4 formed in the synthesis of HfN at high temperature in HfO2-Si3N4 binary system. Introduction of La2O3 promoted the system to generate HfN which was beneficial to reduce the burning loss rate of ceramics. There existed HfN and La4.67Si3O13, La5Si3NO12, LaSiNO2, La4Si2N2O7, La2Hf2O7 five lanthanum salt phases in the Hf-Si-La-O-N system.

    Tools

    Get Citation

    Copy Citation Text

    Yang LIU, Youjun LU, Yanrui LI, Liqun LIN, Zhenxia YUAN, Zhenkun HUANG. HfN Formation and Phase Relationships in the Hf-Si-La-O-N System[J]. Journal of Inorganic Materials, 2021, 36(4): 443

    Download Citation

    EndNote(RIS)BibTexPlain Text
    Save article for my favorites
    Paper Information

    Category: RESEARCH PAPER

    Received: Jul. 7, 2020

    Accepted: --

    Published Online: Nov. 24, 2021

    The Author Email: LU Youjun (youjunlu518@hotmail.com)

    DOI:10.15541/jim20200382

    Topics