MgO-Y2O3-Re2O3添加对氮化硅陶瓷微观组织及性能的影响

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Abstract Using α-Si₃N₄as raw powder and MgO-Y₂O₃-Re₂O₃ as sintering assistant, Si₃N₄ ceramics were prepared by hot-pressing sintering, and the density, phase composition, microstructure, thermal conductivity, bending strength and fracture toughness of Si₃N₄ were tested by archimedean drainage method, XRD, SEM, laser flash method, three-point bending method and indentation method. Studies show that in samples with MgO-Y₂O₃-Re₂O₃ (Re=Er, Sm, Dy, La, Y, Yb) added, Sm₂O₃, Y₂O₃,Yb₂O₃ are easy to facilitate Y₂O₃ to form the second phase Y₂SiO₃, Y₂Si₃O₃N₄ and Y₂SiO₅, respectively. Meanwhile, in the Si₃N₄ with MgO-Y₂O₃-Re₂O₃ (Re=Sm, Dy, La,Yb) added, the long columnar crystals are uniformly embedded in the smaller matrix grains, with self-strengthening and toughening. The bending strength is above 920 MPa, and the fracture toughness of indentation is above 6.93 MPa∙m^1/2. Compared with traditional binary sintering assistant MgO-Re₂O₃, MgO-Y₂O₃-Re₂O₃ ternary additive has no regular influence on the microstructure, bending strength and fracture toughness of Si₃N₄ ceramics with the change of Re³⁺ radius, but its thermal conductivity increases with the decrease of Re³⁺ radius.

Key words： MgO-Y₂O₃-Re₂O₃ ternary additive thermal conductivity bending strength fracture toughness

Received: 07 August 2019 Published: 19 June 2020

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	LU Xinxin
	LIU Wei
	LI Lin
	LI Jianbin

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LU Xinxin,LIU Wei,LI Lin, et al. Effects of MgO-Y₂O₃-Re₂O₃ on microstructure and properties of Si₃N₄ ceramics[J]. Materials Science and Engineering of Powder Metallurgy, 2019, 24(6): 536-541.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2019/V24/I6/536

[1] BECHER P F.Microstructural design of toughened ceramics[J]. Journal of American Ceramic Society, 1991, 74(2): 255-269.
[2] 蒋强国. 含三元烧结助剂氮化硅陶瓷的制备、微观结构及性能研究[D]. 广州: 广东工业大学, 2015: 1-108.
JIANG Qiangguo.Preparation, microstructure and properties of silicon nitride ceramics containing ternary sintering assistant[D]. Guangzhou: Guangdong University of Technology, 2015: 1-108.
[3] BECHER P F, PAINTER G S, SHIBATA N, et al.Effects of rare-earth (RE) intergranular adsorption on the phase transformation, microstructure evolution, and mechanical properties in silicon nitride with RE₂O₃+MgO Additives: RE=La, Gd, and Lu[J]. Journal of the American Ceramic Society, 2010, 91(7): 2328-2336.
[4] LI Y X, HAN W B, Chen G Q, et al.Influence of CeO₂ addition on Si₃N₄ ceramics[J]. Materials Research Innovations, 2015, 19(S1): 339-342.
[5] 段于森, 张景贤, 李晓光, 等. 稀土氧化物对常压烧结氮化硅陶瓷性能的影响[J]. 无机材料学报, 2017(12): 46-50.
DUAN Yusen, ZHANG Jingxian, LI Xiaoguang, et al.Effect of rare earth oxides on the properties of silicon nitride ceramics sintered at atmospheric pressure[J]. Journal of Inorganic Materials, 2017(12): 46-50.
[6] DOW H S, KIM W S, LEE J W.Thermal and electrical properties of silicon nitride substrates[J]. AIP Advances, 2017, 7(9): 1207-1212.
[7] YANG Chunping, DING Junjie, MA Jie, et al.Microstructure tailoring of high thermal conductive silicon nitride through addition of nuclei with spark plasma sintering and post-sintering heat treatment[J]. Journal of Alloys and Compounds, 2019, 785(1): 89-95.
[8] WILLS R R, HOLMQUIST S, WIMMER J M, et al.Phase relationships in the system Si₃N₄-Y₂O₃-SiO₂[J]. Journal of Materials Science, 1976, 11(7): 1305-1309.
[9] BECHER P F, SHIBATA N, PAINTER G S, et al.Observations on the influence of secondary Me oxide additives (Me=Si, Al, Mg) on the microstructural evolution and mechanical behavior of silicon nitride ceramics containing RE₂O₃ (RE=La, Gd, Lu)[J]. Journal of the American Ceramic Society, 2010, 93(2): 570-580.
[10] 李勇霞. 高热导Si₃N₄基复合材料的制备与性能研究[D]. 哈尔滨: 哈尔滨工业大学, 2018: 1-103.
LI Yongxia.Preparation and properties of high thermal conductivity Si₃N₄ matrix composites[D]. Harbin: Harbin Institute of Technology, 2018: 1-103.
[11] 蒋强国, 古尚贤, 周茂鹏, 等. MgO-Lu₂O₃-Re₂O₃三元添加剂对氮化硅陶瓷性能的影响[J]. 陶瓷学报, 2015, 36(5): 459-463.
JIANG Qiangguo, GU Shangxian, ZHOU Maopeng, et al.Effects of MgO-Lu₂O₃-Re₂O₃ ternary additives on the properties of silicon nitride ceramics[J]. Journal of Ceramics, 2015, 36(5): 459-463.
[12] 谢娇娇, 艾江. 烧结助剂(Y₂O₃、Al₂O₃、La₂O₃)对β-Si₃N₄自增韧陶瓷的性能研究[J]. 陶瓷, 2017, 1(9): 37-43.
XIE Jiaojiao, AI Jiang.Study on properties of β-Si₃N₄ self-toughened ceramics with sintering aids(Y₂O₃, Al₂O₃, La₂O₃)[J]. Ceramics, 2017, 1(9): 37-43.
[13] TATARKO P, STEFANIA L, DUSZA J, et al.Influence of Various rare-earth oxide additives on microstructure and mechanical properties of silicon nitride based nanocomposites[J]. Materials Science & Engineering A, 2010, 527(18/19): 4771-4778.
[14] BECHER P F, PAINTER G S, SUN E Y, et al.The importance of amorphous intergranular films in self-reinforced Si₃N₄ ceramics[J]. Acta Materialia, 2000, 48(18/19): 4493-4499.
[15] WANG Z H, BAI B, NING X S.Effect of rare earth additives on properties of silicon nitride ceramics[J]. Advances in Applied Ceramics, 2014, 113(3): 173-177.
[16] WEI L, TONG W, HE R, et al.Effect of the Y₂O₃ additive concentration on the properties of a silicon nitride ceramic substrate[J]. Ceramics International, 2016, 42(16): 18641-18647.
[17] YOU Z, HUDEKI H, DAI K, et al.Effects of yttria and magnesia on densification and thermal conductivity of sintered reaction-bonded silicon nitrides[J]. Journal of the American Ceramic Society, 2018, 102(4): 1579-1588.