Reaction Synthesizes of ZrN and Phase Diagram in the Si3N4-ZrO2-La2O3 System

Yanrui LI; Youjun LU; Yang LIU; Zhenxia YUAN; Zhenkun HUANG

doi:10.15541/jim20190404

Journals >Journal of Inorganic Materials >Volume 35 >Issue 7 >Page 822 > Article

Journal of Inorganic Materials
Vol. 35, Issue 7, 822 (2020)

Reaction Synthesizes of ZrN and Phase Diagram in the Si₃N₄-ZrO₂-La₂O₃ System

Yanrui LI, Youjun LU^*, Yang LIU, Zhenxia YUAN, and Zhenkun HUANG

Author Affiliations

School of Materials Science and Engineering, North Minzu University,Yinchuan 750021,China

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DOI: 10.15541/jim20190404 Cite this Article

Yanrui LI, Youjun LU, Yang LIU, Zhenxia YUAN, Zhenkun HUANG. Reaction Synthesizes of ZrN and Phase Diagram in the Si₃N₄-ZrO₂-La₂O₃ System[J]. Journal of Inorganic Materials, 2020, 35(7): 822 Copy Citation Text

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Abstract

Si₃N₄-ZrO₂-La₂O₃ ternary system were prepared via solid-state reaction at 1500 ℃ for 1 h with N₂ protection, yielding coexistence phase of ZrN and lanthanum-based compounds, such as La_4.67Si₃O₁₃, La₅Si₃NO₁₂, La₄Si₂N₂O₇, LaSiNO₂, and La₂Zr₂O₇. Since the generated ZrN and lanthanum-based compounds are not located on the triangle plane of Si₃N₄-ZrO₂-La₂O₃ system, it is necessary to add SiO₂ to extend the ternary into quinary system of Si₃N₄-SiO₂-La₂O₃-ZrO₂-ZrN. After the phase diagram of this quinary system is confirmed and presented, the phase diagram of La₂O₃-SiO₂-ZrO₂ ternary subsystem at 1570 ℃ is further proposed for the first time. In addition, La₂O₃ in the Si₃N₄-ZrO₂-La₂O₃ ternary system can help to simulate the substitution reaction between Si₃N₄ and ZrO₂ to produce ZrN.

Keywords

multiphase ceramics phase relationships solid state reaction zirconium nitride

(3)Si₃N₄+3ZrO₂+3La₂O₃=3ZrN+3La₂SiO₅+0.5N₂(g)

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(4)2Si₃N₄+6ZrO₂+3La₂O₃=6ZrN+3La₂Si₂O₇+N₂(g)

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(5)$\text{3S}{{\text{i}}_{\text{3}}}{{\text{N}}_{\text{4}}}\text{+9Zr}{{\text{O}}_{\text{2}}}\text{+7L}{{\text{a}}_{\text{2}}}{{\text{O}}_{\text{3}}}\text{=9ZrN+3L}{{\text{a}}_{\text{4}\text{.67}}}\text{S}{{\text{i}}_{\text{3}}}{{\text{O}}_{\text{13}}}\text{+1}\text{.5}{{\text{N}}_{\text{2}}}(\text{g})$

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(6)$\text{4S}{{\text{i}}_{\text{3}}}{{\text{N}}_{\text{4}}}\text{+9Zr}{{\text{O}}_{\text{2}}}\text{+10L}{{\text{a}}_{\text{2}}}{{\text{O}}_{\text{3}}}\text{=9ZrN+4L}{{\text{a}}_{\text{5}}}\text{S}{{\text{i}}_{\text{3}}}\text{N}{{\text{O}}_{\text{12}}}\text{+1}\text{.5}{{\text{N}}_{\text{2}}}(\text{g})$

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(7)$\text{4S}{{\text{i}}_{\text{3}}}{{\text{N}}_{\text{4}}}\text{+3Zr}{{\text{O}}_{\text{2}}}\text{+6L}{{\text{a}}_{\text{2}}}{{\text{O}}_{\text{3}}}\text{=3ZrN+12LaSiN}{{\text{O}}_{\text{2}}}\text{+0}\text{.5}{{\text{N}}_{\text{2}}}(\text{g})$

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(8)$\text{4S}{{\text{i}}_{\text{3}}}{{\text{N}}_{\text{4}}}\text{+3Zr}{{\text{O}}_{\text{2}}}\text{+12L}{{\text{a}}_{\text{2}}}{{\text{O}}_{\text{3}}}\text{=3ZrN+6L}{{\text{a}}_{\text{4}}}\text{S}{{\text{i}}_{\text{2}}}{{\text{N}}_{\text{2}}}{{\text{O}}_{\text{7}}}\text{+0}\text{.5}{{\text{N}}_{\text{2}}}(\text{g})$

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(9)$\text{8S}{{\text{i}}_{\text{3}}}{{\text{N}}_{\text{4}}}\text{+3Zr}{{\text{O}}_{\text{2}}}\text{+8L}{{\text{a}}_{\text{2}}}{{\text{O}}_{\text{3}}}\text{=3ZrN+12LaSiN}{{\text{O}}_{\text{2}}}\text{+2L}{{\text{a}}_{\text{2}}}\text{S}{{\text{i}}_{\text{6}}}{{\text{N}}_{\text{8}}}{{\text{O}}_{\text{3}}}\text{+0}\text{.5}{{\text{N}}_{\text{2}}}(\text{g})$

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(3′)Si₃N₄+3ZrO₂+3La₂O₃+3/4O₂= 2ZrN+La₅Si₃NO₁₂+0.5La₂Zr₂O₇+NO(g)

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