Optimization of mechanical and dielectric properties by controlling densification and microstructure in silicon nitride ceramics prepared by hot pressing method

Subject Areas :

S. Salman S. Afghahi ¹ , Amirhossein kouchaki foroshani ² , Pouria Dehghani ³ , farhood heydari ⁴

1 - Associate Professor, Faculty of Engineering, Imam Hossein University, Tehran, Iran.
2 - Ph.D. student Department of Ceramic, Materials and Energy Research Center, Karaj, Alborz, Iran
3 - Researcher Faculty of Engineering, Imam Hossein University, Tehran, Iran.
4 - Ph.D. student, Researcher at Advanced Materials and Nanotechnology Research Center, Imam Hossein University, Tehran, Iran

Received: 2022-09-09 Accepted : 2023-02-18 Published : 2023-11-22

Keywords: Mechanical Properties, Silicon Nitride, dielectric, Hot press.Sintering,

Abstract :

Silicon nitride ceramics are materials with excellent mechanical, dielectric and thermal properties which with such properties is one of the main candidates for use in high temperature environments. In this study, the effect of sintering temperature on microstructure control and densification and optimization of mechanical and dielectric properties of silicon nitride ceramics prepared by hot pressing at different temperatures of 1500 °C, 1600 °C, 1700 °C and 1800 °C has been investigated. Scanning electron microscopy and X-ray diffraction have been used to study the microstructure and analysis of the formed phases, respectively. According to the X-ray diffraction pattern and the Gazara-Mesier relationship, in the sintered samples at 1600 °C and 1700 °C, all alpha phases were converted to beta, and in the sintered samples at 1500 °C, the conversion rate was 95.45%. Is. The results show that increasing the sintering temperature from 1500˚C to 1800˚C leads to larger rod-shaped grains and achieves dual microstructure and the average grain diameter has increased from 0.7 µm to 1.34 µm. sintered specimen at 1500 °C, with the lowest average diameter (0.7 µm) among other specimens, has the highest flexural strength of 550 ± 9.5 Mpa. Is By increasing the average grain size and decreasing the α/β phase ratio due to the increase in fusion temperature, the mean dielectric constant and tangent of the sample loss increased from 4.5 to 9.2 and from 0.099 to 0.22, respectively

References:

[1]H. Kaya, "The application of ceramic-matrix composites to the automotive ceramic gas turbine", Compos. Sci. Technol, vol. 59, no. 6, pp. 861–872, May 1999, doi: 10.1016/S0266-3538(99)00016-0.

[2]Z. Krstic & V. D. Krstic, "Silicon nitride: the engineering material of the future", J. Mater. Sci, vol. 47, no. 2, pp. 535–552, Jan. 2012, doi: 10.1007/s10853-011-5942-5.

[3]M. H. Bocanegra-Bernal & B. Matovic, "Mechanical properties of silicon nitride-based ceramics and its use in structural applications at high temperatures," Mater. Sci. Eng. A, vol. 527, no. 6, pp. 1314–1338, Mar. 2010, doi: 10.1016/j.msea.2009.09.064.


[4] M. Pettersson, Z. Pakdaman, H. Engqvist, Y. Liu, Z. Shen & E. Östhols, "Spark plasma sintered β-phase silicon nitride with Sr and Ca as a sintering aid for load bearing medical applications", J. Eur. Ceram. Soc, vol. 32, no. 11, pp. 2705–2709, Aug. 2012, doi: 10.1016/j.jeurceramsoc.2011.12.027.

[5] X. J. Liu, Z. Y. Huang, Q. M. Ge, X. W. Sun & L. P. Huang, "Microstructure and mechanical properties of silicon nitride ceramics prepared by pressureless sintering with MgO-Al2O3 -SiO2 as sintering additive", J. Eur. Ceram. Soc, vol. 25, no. 14, pp. 3353–3359, 2005, doi:10.1016/j.jeurceramsoc.2004.08.025.

[6]S. Guo, N. Hirosaki, Y. Yamamoto, T. Nishimura & M. Mitomo, "Dependence of fracture stress on applied stress rate in a Yb2O3-SiO2-doped hot-pressed silicon nitride ceramic", J. Mater. Res, vol. 16, no. 11, pp. 3254–3261, 2001, doi: 10.1557/JMR.2001.0448.

[7] P. F. Becher & et al, "Microstructural Design of Silicon Nitride with Improved Fracture Toughness: I, Effects of Grain Shape and Size", J. Am. Ceram. Soc, vol. 81, no. 11, pp. 2821–2830, Jan. 2005, doi: 10.1111/j.1151-2916.1998.tb02702.x.

[8] V. Sharma, S. Nemat-Nasser & K. S. Vecchio, "Effect of grain-boundary phase on dynamic compression fatigue in hot-pressed silicon nitride", J. Am. Ceram. Soc, vol. 81, no. 1, pp. 129–139, 1998, doi: 10.1111/j.1151-2916.1998.tb02304.x.

[9] I. Bar-On, F. I. Baratta & K. Cho, "Crack stability and its effect on fracture toughness of hot-pressed silicon nitride beam specimens", Journal of the American Ceramic Society, vol. 79, no. 9. pp. 2300–2308, 1996. doi: 10.1111/j.1151-2916.1996.tb08976.x.

[10] ح. صدلاله و ا. نورمحمدی، "اثر فرآیند پرس گرم بر ریزساختار و خواص مغناطیسی آلیاژ نانو بلورین فاینمت"، مواد و فناوری‌های پیشرفته، دوره 4، شماره 1، صفحه 54-47، 1394.

[11] ص. منافی و م. خواجه لو، " تولید و ارزیابی خواص نانوکامپوزیت زمینه سرامیکی B4C/BN توسط فرآیند پرس گرم"، نانو مواد، دوره 10، شماره 33، صفحه 58-53، 1396.

[12] H. Liang & et al, "YB2C2: A new additive for fabricating Si3N4 ceramics with superior mechanical properties and medium thermal conductivity", Ceram. Int, vol. 46, no. 4, pp. 5239–5243, Mar. 2020, doi: 10.1016/j.ceramint.2019.10.272.



[13] Y. Han & et al, "Optimum sintering temperature of high quality silicon nitride ceramics under oscillatory pressure", Ceram. Int, vol. 44, no. 6, pp. 6949–6952, Apr. 2018, doi: 10.1016/j.ceramint.2018.01.126.

[14] J. Yang, J. Yang, S. Shan, J. Gao & T. Ohji, "Effect of Sintering Additives on Microstructure and Mechanical Properties of Porous Silicon Nitride Ceramics", J. Am. Ceram. Soc, vol. 89, no. 12, pp. 3843–3845, Dec. 2006, doi: 10.1111/j.1551-2916.2006.01294.x.

[15] W. Liu, W. Tong, X. Lu & S. Wu, "Effects of different types of rare earth oxide additives on the properties of silicon nitride ceramic substrates", Ceram. Int, vol. 45, no. 9, pp. 12436–12442, Jun. 2019, doi: 10.1016/j.ceramint.2019.03.176.

[16] K. Jeong, J. Tatami, M. Iijima & T. Nishimura, "Spark plasma sintering of silicon nitride using nanocomposite particles", Adv. Powder Technol, vol. 28, no. 1, pp. 37–42, Jan. 2017, doi: 10.1016/j.apt.2016.06.027.

[17] S. C. Luo, W. M. Guo, K. Plucknett & H. T. Lin, "Improved toughness of spark-plasma-sintered Si3N4 ceramics by adding HfB2", Ceram. Int, vol. 47, no. 6, pp. 8717–8721, Mar. 2021, doi: 10.1016/j.ceramint.2020.11.201.

[18] W. Liu, W. Tong, R. He, H. Wu & S. Wu, "Effect of the Y2O3 additive concentration on the properties of a silicon nitride ceramic substrate", Ceram. Int, vol. 42, no. 16, pp. 18641–18647, Dec. 2016, doi: 10.1016/j.ceramint.2016.09.001.

[19] Q. G. Jiang & et al, "Influence of powder characteristics on hot-pressed Si3N4 ceramics", Sci. Sinter, vol. 49, no. 1, pp. 81–89, 2017, doi: 10.2298/SOS1701081J.

[20] H. Seiner & et al, "Elastic properties of silicon nitride ceramics reinforced with graphene nanofillers", Mater. Des, vol. 87, pp. 675–680, 2015, doi: 10.1016/j.matdes.2015.08.044.

[21] J. Wippler, S. Fünfschilling, F. Fritzen, T. Böhlke & M. J. Hoffmann, "Homogenization of the thermoelastic properties of silicon nitride", Acta Mater, vol. 59, no. 15, pp. 6029–6038, 2011, doi: 10.1016/j.actamat.2011.06.011.

[22] P. Šajgalik, J. Dusza & M. J. Hoffmann, "Relationship between Microstructure, Toughening Mechanisms, and Fracture Toughness of Reinforced Silicon Nitride Ceramics", J. Am. Ceram. Soc, vol. 78, no. 10, pp. 2619–2624, Oct. 1995, doi: 10.1111/j.1151-2916.1995.tb08031.x.

[23] B. Ma, Y. Tang & C. Deng, "Effects of Al2O3–Y2O3/Yb2O3 additives on microstructures and mechanical properties of silicon nitride ceramics prepared by hot‐pressing sintering", Int. J. Appl. Ceram. Technol, May 2022, doi: 10.1111/ijac.14081.

[24] Q. Dai, D. He, F. Meng, P. Liu & X. Liu, "Materials Science in Semiconductor Processing Dielectric constant, dielectric loss and thermal conductivity of Si3N4 ceramics by hot pressing with CeO2 – MgO as sintering aid", Mater. Sci. Semicond. Process, vol. 121, no. August 2020, p. 105409, 2021, doi: 10.1016/j.mssp.2020.105409.

[25] S. Dahms, F. Gemse, U. Basler, H. P. Martin & A. Triebert, "Diffusion joining of silicon nitride ceramics," Est. J. Eng, vol. 15, no. 4, p. 301, 2009, doi: 10.3176/eng.2009.4.07.

[26] Y. Song, L. Liu, D. Liu, X. Song & J. Cao, "Low-temperature bonding of Cu on Si3N4 substrate by using Ti/Cu thin films", Mater. Lett, vol. 320, p. 132330, 2022, doi: https://doi.org/10.1016/j.matlet.2022.132330.

[27] H. Singh, M. D. Hayat, H. Zhang & P. Cao, "The decomposition of Si3N4 in titanium and its effect on wear properties," Wear, vol. 420–421, pp. 87–95, Feb. 2019, doi: 10.1016/j.wear.2018.12.094.

[28] G. Cotin & et al, "A Confinement‐Driven Nucleation Mechanism of Metal Oxide Nanoparticles Obtained via Thermal Decomposition in Organic Media", Small, vol. 18, no. 20, p. 2200414, May 2022, doi: 10.1002/smll.202200414.

[29] C. C. Ye, W. Q. Wei, X. Fu, C. H. Wang & H. Q. Ru, "Effect of sintering activation energy on Si3N4 composite ceramics", Ceram. Int, vol. 48, no. 4, pp. 4851–4857, 2022, doi:https://doi.org/10.1016/j.ceramint.2021.11.021.

[30] A. H. Nassajpour-Esfahani, A. Alhaji, M. R. Hahftbaradaran-Esfahani, R. Emadi & A. Bahrami, "Oxidation and phase transformation behaviors of Si3N4-xMgAl2O4 (0 < x < 90 wt.%) nanocomposites in vacuum, air, and nitrogen atmospheres", Ceram. Int, vol. 47, no. 21, pp. 30807–30814, 2021, doi:https://doi.org/10.1016/j.ceramint.2021.07.261.

[31]C. Ye & et al, "Investigation on thermal conductivity and mechanical properties of Si3N4 ceramics via one-step sintering", Ceram. Int, vol. 47, no. 23, pp. 33353–33362, 2021, doi: https://doi.org/10.1016/j.ceramint.2021.08.238.

[32] Y. Wang & et al, "Synthesis of monodisperse and high-purity α-Si3N4 powder by carbothermal reduction and nitridation", Adv. Powder Technol, vol. 32, no. 8, pp. 3101–3106, 2021, doi:https://doi.org/10.1016/j.apt.2021.06.023.

[33] Z. Liu & et al, "Liquid-Phase-Assisted Catalytic Nitridation of Silicon and In Situ Growth of &alpha-Si3N4", Materials (Basel), vol. 15, no. 17, 2022, doi: 10.3390/ma15176074.

[34] H. Ding, Y. Hu, X. Li, Z. Zhao & H. Ji, "Microstructure, mechanical properties and sintering mechanism of pressureless-sintered porous Si3N4 ceramics with YbF3-MgF2 composite sintering aids", Ceram. Int, vol. 46, no. 2, pp. 2558–2564, Feb. 2020, doi: 10.1016/j.ceramint.2019.09.114.

[35] A. Kumar, R. S. Rana, R. Purohit, K. K. Saxena, J. Xu & V. Malik, "Metallographic Study and Sliding Wear Optimization of Nano Si3N4 Reinforced High-Strength Al Metal Matrix Composites", Lubricants, vol. 10, no. 9, 2022, doi: 10.3390/lubricants10090202.

[36] J. Xu, K. Hattori, Y. Seino & I. Kojima, "Microstructure and properties of CrN/Si3N4 nano-structured multilayer films", Thin Solid Films, vol. 414, no. 2, pp. 239–245, 2002, doi:https://doi.org/10.1016/S0040-6090(02)00483-2.

[37] F. Hu, T. Zhu, Z. Xie & J. Liu, "Effect of composite sintering additives containing non-oxide on mechanical, thermal and dielectric properties of silicon nitride ceramics substrate", Ceram. Int, vol. 47, no. 10, pp. 13635–13643, May 2021, doi: 10.1016/j.ceramint.2021.01.224.

[38] C. E. Lee, M. J. Kim, Y. J. Park, J. W. Ko, H. N. Kim & S. Bae, "The effect of silicon particle size on the characteristics of porous sintered reaction bonded silicon nitride", Int. J. Refract. Met. Hard Mater, vol. 101, no. July, p. 105647, 2021.

[39] A. R. Von Hippel, "Dielectric Materials and Applications", Artech House, 1995.

[40] C. Gabriel, S. Gabriel, E. H. Grant, E. H. Grant, B. S. J. Halstead & D. Michael P. Mingos, "Dielectric parameters relevant to microwave dielectric heating", Chem. Soc. Rev, vol. 27, no. 3, pp. 213–224, 1998, doi: 10.1039/A827213Z.

[41] O. A. Lukianova & V. V. Sirota, "Dielectric properties of silicon nitride ceramics produced by free sintering", Ceram. Int, vol. 43, no. 11, pp. 8284–8288, Aug. 2017, doi: 10.1016/j.ceramint.2017.03.161.

6- پی‌نوشت
[1] Hot Press
[2] Spark Plasma Sintering
[3] Hot Isostatic Pressing
[4] Liu et al
[5] Jiang et al
[6] Gazara-Meseir
[7] Park et al