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Self-reinforced lithium disilicate (Li2Si2O5, LD) glass-ceramics were hot pressing sintered by introducing 5 wt% Li2Si2O5 crystal seeds into two different glass compositions of SiO2–Li2O–P2O5–ZrO2–Al2O3–K2O–La2O3 (7C LD) and SiO2–Li2O–K2O–La2O3 (4C LD). The results show that the seeds play an important role in the crystallization inducement, and microstructural and property improvement of the glass, especially for the glass powder without the nucleating agent of P2O5. The microstructure features a wider bimodal grain size distribution with large rod-like crystals epitaxially grown along the seeds and small crystals nucleated from the glass powder itself, contributing to the improvement of the performance especially the fracture toughness. The specimen of 4C LD glass with the addition of 5 wt% Li2Si2O5 seeds exhibited the best comprehensive properties with a good flexural strength (396±7 MPa), improved fracture toughness (3.31±0.19 MPa·m1/2), and comparable translucency as IPS e.max. This research provides a new idea and method for the improvement of the fracture toughness of lithium disilicate glass-ceramics without affecting its aesthetic appearance, and lays the foundation for its clinical applications.


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Improved performances of lithium disilicate glass-ceramics by seed induced crystallization

Show Author's information Ting ZHAOaMei-Mei LIANaYi QINa( )Jian-Feng ZHUaXin-Gang KONGaJian-Feng YANGb
School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science and Technology, Xi’an 710021, China
State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China

Abstract

Self-reinforced lithium disilicate (Li2Si2O5, LD) glass-ceramics were hot pressing sintered by introducing 5 wt% Li2Si2O5 crystal seeds into two different glass compositions of SiO2–Li2O–P2O5–ZrO2–Al2O3–K2O–La2O3 (7C LD) and SiO2–Li2O–K2O–La2O3 (4C LD). The results show that the seeds play an important role in the crystallization inducement, and microstructural and property improvement of the glass, especially for the glass powder without the nucleating agent of P2O5. The microstructure features a wider bimodal grain size distribution with large rod-like crystals epitaxially grown along the seeds and small crystals nucleated from the glass powder itself, contributing to the improvement of the performance especially the fracture toughness. The specimen of 4C LD glass with the addition of 5 wt% Li2Si2O5 seeds exhibited the best comprehensive properties with a good flexural strength (396±7 MPa), improved fracture toughness (3.31±0.19 MPa·m1/2), and comparable translucency as IPS e.max. This research provides a new idea and method for the improvement of the fracture toughness of lithium disilicate glass-ceramics without affecting its aesthetic appearance, and lays the foundation for its clinical applications.

Keywords:

lithium disilicate (LD), seeds, mechanical properties, translucency
Received: 25 July 2020 Revised: 22 January 2021 Accepted: 22 January 2021 Published: 03 March 2021 Issue date: June 2021
References(64)
[1]
Thieme K, Avramov I, Rüssel C. The mechanism of deceleration of nucleation and crystal growth by the small addition of transition metals to lithium disilicate glasses. Sci Rep 2016, 6: 25451.
[2]
Gaddam A, Fernandes HR, Tulyaganov DU, et al. Role of manganese on the structure, crystallization and sintering of non-stoichiometric lithium disilicate glasses. Rsc Adv 2014, 4: 13581-13592.
[3]
Zhao T, Qin Y, Wang B, et al. Improved densification and properties of pressureless-sintered lithium disilicate glass-ceramics. Mat Sci Eng A 2015, 620: 399-406.
[4]
Wang F, Gao J, Wang H, et al. Flexural strength and translucent characteristics of lithium disilicate glass-ceramics with different P2O5 content. Mater Des 2010, 31: 3270-3274.
[5]
Huang SF, Li Y, Wei SH, et al. A novel high-strength lithium disilicate glass-ceramic featuring a highly intertwined microstructure. J Eur Ceram Soc 2017, 37: 1083-1094.
[6]
Wen LE, Roberts HW, Platt JA, et al. Microstructural evolution and physical behavior of a lithium disilicate glass-ceramic. Dent Mater 2015, 31: 928-940.
[7]
Zhang F, Reveron H, Spies BC, et al. Trade-off between fracture resistance and translucency of zirconia and lithium-disilicate glass ceramics for monolithic restorations. Acta Biomater 2019, 91: 24-34.
[8]
Tinschert J, Natt G, Mautsch W, et al. Fracture resistance of lithium disilicate-, alumina-, and zirconia-based three-unit fixed partial dentures: A laboratory study. Int J Prosthodont 2001, 14: 231-238.
[9]
Harada K, Raigrodski AJ, Chung KH, et al. A comparative evaluation of the translucency of zirconias and lithium disilicate for monolithic restorations. J Prosthet Dent 2016, 116: 257-263.
[10]
Huang X, Zheng X, Zhao G, et al. Microstructure and mechanical properties of zirconia-toughened lithium disilicate glass-ceramic composites. Mater Chem Phys 2014, 143: 845-852.
[11]
Thieme K, Ruessel C. Nucleation and growth kinetics and phase analysis in zirconia-containing lithium disilicate glass. J Mater Sci 2015, 50: 1488-1499.
[12]
Schweiger M, Frank M, Von Clausbruch SC, et al. Microstructure and properties of a composite system for dental applications composed of glass-ceramics in the SiO2–Li2O–ZrO2–P2O5 system and ZrO2-ceramic (TZP). J Mater Sci 1999, 34: 4563-4572.
[13]
Elsaka SE, Elnaghy AM. Mechanical properties of zirconia reinforced lithium silicate glass-ceramic. Dent Mater 2016, 32: 908-914.
[14]
Bergamo ETP, Bordin D, Ramalho IS, et al. Zirconia-reinforced lithium silicate crowns: Effect of thickness on survival and failure mode. Dent Mater 2019, 35: 1007-1016.
[15]
Zhang NZ, Anusavice KJ. Effect of alumina on the strength, fracture toughness, and crystal structure of fluorcanasite glass-ceramics. J Am Ceram Soc 1999, 82: 2509-2513.
[16]
Tzeng JM, Duh JG, Chung KH, et al. Al2O3- and ZrO2-modified dental glass ceramics. J Mater Sci 1993, 28: 6127-6135.
[17]
Guazzato M, Albakry M, Ringer SP, et al. Strength, fracture toughness and microstructure of a selection of all-ceramic materials. Part I. Pressable and alumina glass-infiltrated ceramics. Dent Mater 2004, 20: 441-448.
[18]
Kotoul M, Pokluda J, Šandera P, et al. Toughening effects quantification in glass matrix composite reinforced by alumina platelets. Acta Mater 2008, 56: 2908-2918.
[19]
Xia L, Wang XY, Wen GW, et al. Influence of brick pattern interface structure on mechanical properties of continuous carbon fiber reinforced lithium aluminosilicate glass-ceramics matrix composites. J Eur Ceram Soc 2012, 32: 409-418.
[20]
Sarno RD, Tomozawa M. Toughening mechanisms for a zirconia-lithium aluminosilicate glass-ceramic. J Mater Sci 1995, 30: 4380-4388.
[21]
Heffernan MJ, Aquilino SA, Diaz-Arnold AM, et al. Relative translucency of six all-ceramic systems. Part II: Core and veneer materials. J Prosthet Dent 2002, 88: 10-15.
[22]
Gonzaga CC, Okada CY, Cesar PF, et al. Effect of processing induced particle alignment on the fracture toughness and fracture behavior of multiphase dental ceramics. Dent Mater 2009, 25: 1293-1301.
[23]
Wen G, Zheng X, Song L. Effects of P2O5 and sintering temperature on microstructure and mechanical properties of lithium disilicate glass-ceramics. Acta Mater 2007, 55: 3583-3591.
[24]
Denry IL, Holloway JA. Effect of post-processing heat treatment on the fracture strength of a heat-pressed dental ceramic. J Biomed Mater Res Part B: Appl Biomater 2004, 68B: 174-179.
[25]
Albakry M, Guazzato M, Swain MV. Influence of hot pressing on the microstructure and fracture toughness of two pressable dental glass-ceramics. J Biomed Mater Res Part B: Appl Biomater 2004, 71B: 99-107.
[26]
Yuan K, Wang F, Gao J, et al. Effect of zircon-based tricolor pigments on the color, microstructure, flexural strength and translucency of a novel dental lithium disilicate glass-ceramic. J Biomed Mater Res Part B: Appl Biomater 2014, 102: 98-107.
[27]
Yuan K, Wang F, Gao J, et al. Effect of sintering time on the microstructure, flexural strength and translucency of lithium disilicate glass-ceramics. J Non-Cryst Solids 2013, 362: 7-13.
[28]
Shan ZJ, Liu JX, Shi F, et al. A new strengthening theory for improving the fracture strength of lithium disilicate glass-ceramics by introducing Rb or Cs ions. J Non-Cryst Solids 2018, 481: 479-485.
[29]
Shan ZJ, Liu JX, Liu M, et al. Surface strengthening of lithium disilicate glass-ceramic by ion-exchange using Rb, Cs nitrates. Ceram Int 2018, 44: 12466-12471.
[30]
Zheng X, Wen G, Song L, et al. Effects of P2O5 and heat treatment on crystallization and microstructure in lithium disilicate glass ceramics. Acta Mater 2008, 56: 549-558.
[31]
Molla AR, Chakradhar RPS, Kesavulu CR, et al. Microstructure, mechanical, EPR and optical properties of lithium disilicate glasses and glass-ceramics doped with Mn2+ ions. J Alloys Compd 2012, 512: 105-114.
[32]
Thompson JY, Anusavice KJ, Balasubramaniam B, et al. Effect of micmcracking on the fracture toughness and fracture surface fractal dimension of lithia-based glass-ceramics. J Am Ceram Soc 1995, 78: 3045-3049.
[33]
Zhao T, Li AJ, Qin Y, et al. Influence of SiO2 contents on the microstructure and mechanical properties of lithium disilicate glass-ceramics by reaction sintering. J Non-Cryst Solids 2019, 512: 148-154.
[34]
Zhao T, Qin Y, Zhang P, et al. High-performance, reaction sintered lithium disilicate glass-ceramics. Ceram Int 2014, 40: 12449-12457.
[35]
Hirao K, Nagaoka T, Brito ME, et al. Microstructure control of silicon nitride by seeding with rodlike β-silicon nitride particles. J Am Ceram Soc 1994, 77: 1857-1862.
[36]
Pyzik AJ, Beaman DR. Microstructure and properties of self-reinforced silicon nitride. J Am Ceram Soc 1993, 76: 2737-2744.
[37]
Yoshizawa YI, Toriyama M, Kanzaki S. Preparation of high fracture toughness alumina sintered bodies from bayer aluminum hydroxide. J Ceram Soc Jpn 1998, 106: 1172-1177.
[38]
Chen IW, Rosenflanz A. A tough SiAlON ceramic based on α-Si3N4 with a whisker-like microstructure. Nature 1997, 389: 701-704.
[39]
Peillon FC, Thevenot F. Microstructural designing of silicon nitride related to toughness. J Eur Ceram Soc 2002, 22: 271-278.
[40]
Becher PF, Hsueh CH, Angelini P, et al. Toughening behavior in whisker-reinforced ceramic matrix composites. J Am Ceram Soc 1988, 71: 1050-1061.
[41]
Wang B, Yang J, Guo R, et al. Microstructure and property enhancement of silicon nitride-barium aluminum silicate composites with β-Si3N4 seed addition. J Mater Sci 2009, 44: 1351-1356.
[42]
Höland W, Apel E, van‘t Hoen C, et al. Studies of crystal phase formations in high-strength lithium disilicate glass-ceramics. J Non-Cryst Solids 2006, 352: 4041-4050.
[43]
Soares PC, Zanotto ED, Fokin VM, et al. TEM and XRD study of early crystallization of lithium disilicate glasses. J Non-Cryst Solids 2003, 331: 217-227.
[44]
Fernandes HR, Tulyaganov DU, Goel A, et al. Effect of K2O on structure-property relationships and phase transformations in Li2O-SiO2 glasses. J Eur Ceram Soc 2012, 32: 291-298.
[45]
Thieme K, Rüssel C. Nucleation inhibitors—The effect of small concentrations of Al2O3, La2O3 or TiO2 on nucleation and crystallization of lithium disilicate. J Eur Ceram Soc 2014, 34: 3969-3979.
[46]
Bischoff C, Eckert H, Apel E, et al. Phase evolution in lithium disilicate glass-ceramics based on non-stoichiometric compositions of a multi-component system: Structural studies by 29Si single and double resonance solid state NMR. Phys Chem Chem Phys 2011, 13: 4540-4551.
[47]
Apel E, van’t Hoen C, Rheinberger V, et al. Influence of ZrO2 on the crystallization and properties of lithium disilicate glass-ceramics derived from a multi-component system. J Eur Ceram Soc 2007, 27: 1571-1577.
[48]
Fernandes HR, Tulyaganov DU, Goel IK, et al. Crystallization process and some properties of Li2O-SiO2 glass-ceramics doped with Al2O3 and K2O. J Am Ceram Soc 2008, 91: 3698-3703.
[49]
Fernandes HR, Tulyaganov DU, Goel A, et al. Effect of Al2O3 and K2O content on structure, properties and devitrification of glasses in the Li2O-SiO2 system. J Eur Ceram Soc 2010, 30: 2017-2030.
[50]
Lutterotti L, Matthies S, Wenk HR. MAUD: A friendly Java program for Material Analysis Using Diffraction. International Union of Crystallography Newsletter 1999, 21: 14-15.
[51]
Apel E, Höland W, Schweiger M, et al. Lithium disilicate glass ceramic. US Patent 7871948. 2011.
[52]
Burgner LL, Weinberg MC, Lucas P, et al. XRD investigation of metastable phase formation in Li2O-2SiO2 glass. J Non-Cryst Solids 1999, 255: 264-268.
[53]
Burgner LL, Lucas P, Weinberg MC, et al. On the persistence of metastable crystal phases in lithium disilicate glass. J Non-Cryst Solids 2000, 274: 188-194.
[54]
Höland W, Rheinberger V, Schweiger M. Control of nucleation in glass ceramics. Phil Trans R Soc A 2003, 361: 575-589.
[55]
Iqbal Y, Lee WE, Holland D, et al. Metastable phase formation in the early stage crystallisation of lithium disilicate glass. J Non-Cryst Solids 1998, 224: 1-16.
[56]
Huang SF, Cao P, Li Y, et al. Nucleation and crystallization kinetics of a multicomponent lithium disilicate glass by in situ and real-time synchrotron X-ray diffraction. Cryst Growth Des 2013, 13: 4031-4038.
[57]
Höland W, Beall GH. Glass-ceramic Technology. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012.
[58]
Huang SF, Zhang B, Huang ZH, et al. Crystalline phase formation, microstructure and mechanical properties of a lithium disilicate glass-ceramic. J Mater Sci 2013, 48: 251-257.
[59]
Huang S, Huang Z, Gao W, et al. Trace phase formation, crystallization kinetics and crystallographic evolution of a lithium disilicate glass probed by synchrotron XRD technique. Sci Rep 2015, 5: 9159.
[60]
Goharian P, Nemati A, Shabanian M, et al. Properties, crystallization mechanism and microstructure of lithium disilicate glass-ceramic. J Non-Cryst Solids 2010, 356: 208-214.
[61]
Fernandes HR, Tulyaganov DU, Goel A, et al. Structural characterisation and thermo-physical properties of glasses in the Li2O-SiO2-Al2O3-K2O system. J Therm Anal Calorim 2011, 103: 827-834.
[62]
Tulyaganov DU, Agathopoulos S, Kansal I, et al. Synthesis and properties of lithium disilicate glass-ceramics in the system SiO2-Al2O3-K2O-Li2O. Ceram Int 2009, 35: 3013-3019.
[63]
Zhang JY, Zhan H, Fu ZY, et al. In-situ synthesis and sintering of mullite glass composites by SPS. J Adv Ceram 2014, 3: 165-170.
[64]
Höland W, Schweiger M, Frank M, et al. A comparison of the microstructure and properties of the IPS Empress®2 and the IPS Empress® glass-ceramics. J Biomed Mater Res 2000, 53: 297-303.
Publication history
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Publication history

Received: 25 July 2020
Revised: 22 January 2021
Accepted: 22 January 2021
Published: 03 March 2021
Issue date: June 2021

Copyright

© The Author(s) 2021

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 51702193 and 51502165), the General Project in Industrial Area of Shaanxi Province (Grant No. 2020GY-281), the Natural Science Foundation of Shaanxi Provincial Department of Education (Grant No. 20JK0525), the Shaanxi Provincial Education Department serves Local Scientific Research Plan (Grant No. 20JC008), and the Scientific Research Fund of Shaanxi University of Science & Technology (Grant No. BJ16-20 and BJ16-21).

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