Influence of different composite sintering aids on properties of gas-pressure sintered Si3N4 ceramics

doi:10.3969/j.issn.1001-1935.2022.02.010

Abstract

Abstract:

Effects of sintering aids and temperature (1 750 ℃,1 800 ℃,and 1 850 ℃) on densification,the mechanical properties and the microstructure of gas-pressure sintered Si₃N₄ ceramics were explored using Y₂O₃/Al₂O₃,Al₂O₃/MgO and Y₂O₃/Al₂O₃/MgO as composite sintering aids.The results show that the modulus of rupture,the hardness and the fracture toughness of the specimens prepared using Y₂O₃/Al₂O₃ as the sintering aid are better than those of the specimens using the other two aids,and the Y₂O₃/Al₂O₃ aid favors the formation of β-Si₃N₄ grains with high aspect ratio in the microstructures;when the sintering temperature is 1 800 ℃,the density and the mechanical properties of the specimens with Y₂O₃/Al₂O₃ as sintering aid are the best,the bulk density is 3.24 g·cm^-3,and the linear shrinkage rate is 20.73%,with the highest strength,hardness,fracture toughness of 821.9 MPa,14.25 GPa and 7.16 MPa·m^1/2,respectively.

Key words: silicon nitride ceramics, sintering aid, mechanical properties, microstructure

摘要：

以Y₂O₃/Al₂O₃、Al₂O₃/MgO和Y₂O₃/Al₂O₃/MgO等为复合烧结助剂,研究烧结助剂类别及烧结温度(1 750、1 800、1 850 ℃)对气压烧结Si₃N₄陶瓷致密化、显微结构以及力学性能的影响。结果表明:以Y₂O₃/Al₂O₃为烧结助剂所制备样品的抗折强度、硬度和断裂韧性优于其他两种复合助剂制备试样的;Y₂O₃/Al₂O₃复合助剂有利于显微结构中高长径比β-Si₃N₄晶粒的形成。当烧结温度为1 800 ℃时,以Y₂O₃/Al₂O₃为烧结助剂样品的致密度和力学性能最优,此时体积密度为3.24 g·cm^-3,线收缩率为20.73%,强度、硬度和断裂韧性达到最大值,分别为821.9 MPa、14.25 GPa和7.16 MPa·m^1/2。

关键词: Si₃N₄陶瓷, 烧结助剂, 力学性能, 显微结构

CLC Number:

TQ174.75

Zhang Chuang, Song Yijie. Influence of different composite sintering aids on properties of gas-pressure sintered Si₃N₄ ceramics[J]. Refractories, 2022, 56(2): 141-145.

张创, 宋仪杰. 不同复合烧结助剂对气压烧结Si₃N₄陶瓷性能的影响[J]. 耐火材料, 2022, 56(2): 141-145.

Figures/Tables 7

Fig.1 XRD patterns of specimens with different sintering aids fired at 1 800 ℃

Fig.2 SEM images of specimens with different sintering aids fired at 1 800 ℃

Fig.3 SEM images of specimens with different sintering aids fired at 1 800 ℃

Fig.4 SEM images of Si3N4 sample with Y2O3/Al2O3 as sintering aid at different temperatures

Table 1 Properties of specimens with different sintering aids fired at 1 800 ℃

项目	样品A	样品B	样品C
体积密度/(g·cm^-3)	3.24	3.13	3.18
抗折强度/MPa	821.9	348.2	670.8
维氏硬度/GPa	14.26	10.48	13.71
断裂韧性/(MPa·m^1/2)	7.16	5.62	6.07

Fig.5 Flexural strength and fracture toughness of specimen A at different sintering temperatures

Fig.6 Vickers hardness of specimen A fired at different temperatures

References 14

[1]	DEELEY G G, HERBERT M J, MOORE C N. Dense silicon nitride[J]. Powder Metall, 2014, 4(8):145-151. DOI URL
[2]	郭昂, 王战民, 赵世贤, 等. 含LiAlO₂-Y₂O₃复合助烧剂的氮化硅陶瓷低温致密化研究[J]. 耐火材料, 2020, 54(5):369-373.
[3]	郭昂, 王战民, 赵世贤, 等. LiAlO₂为烧结助剂低温无压烧结制备致密Si₃N₄陶瓷陶瓷[J]. 耐火材料, 2020, 54(3):191-195.
[4]	杨亮亮, 谢志鹏, 李双, 等. 气压烧结氮化硅陶瓷的研究与应用进展[J]. 陶瓷学报, 2014, 35(5):457-464.
[5]	MITOMO M, TSUTSUMI M, TANAKA H, et al. Grain growth during gas-pressure sintering of β-Silicon nitride[J]. J Am Ceram Soc, 1990, 73(8):2441-2445. DOI URL
[6]	KRSTIC Z, KRSTIC V D. Silicon nitride:the engineering material of the future[J]. J Mater Sci, 2012, 47(2):535-552. DOI URL
[7]	李凌锋, 王战民, 赵世贤, 等. 采用Li₂O-Al₂O₃助烧剂低温埋碳制备Si₃N₄陶瓷[J]. 耐火材料, 2019, 53(6):405-408+413.
[8]	吴庆文, 胡丰, 谢志鹏. 高性能氮化硅陶瓷的制备与应用新进展[J]. 陶瓷学报, 2018, 39(1):13-19.
[9]	邬凤英, 庄汉锐, 马利泰, 等. 氮气压力对烧结氮化硅性能和显微结构的影响[J]. 无机材料学报, 1991, 6(2):160-165.
[10]	WÖTTING G, ZIEGLER G. Influence of powder properties and processing conditions on microstructure and mechanical properties of sintered Si₃N₄[J]. Ceram Int, 1984, 10(1):18-22. DOI URL
[11]	YANG J F, OHJI T, NIIHARA K. Influence of yttria-alumina content on sintering behavior and microstructure of silicon nitride ceramics[J]. J Am Ceram Soc, 2000, 83(8):2094-2096. DOI URL
[12]	MITOMO M. Pressure sintering of Si₃N₄[J]. J Mater Sci, 1976, 11(6):1103-1107. DOI URL
[13]	KRSTIC Z, YU Z B, KRSTIC V D. Effect of grain width and aspect ratio on mechanical properties of Si₃N₄ ceramics[J]. J Mater Sci, 2007, 42(14):5431-5436. DOI URL
[14]	TANI E, UMEBAYASHI S, KISHI K, et al. Gas-pressure sintering of Si₃N₄ with concurrent addition of Al₂O₃ and 5 wt% rare-earth oxide:High fracture toughness Si₃N₄ with fiber like structure[J]. Am Ceram Soc Bull, 1986, 65(9):1311-1315.

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Influence of different composite sintering aids on properties of gas-pressure sintered Si₃N₄ ceramics

不同复合烧结助剂对气压烧结Si₃N₄陶瓷性能的影响

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