Effects of Microwave Sintering and ZnO Addition on the Properties of Zirconia Toughened Alumina Ceramics for Artificial Joints

Abstract

Brittleness remains one of the primary barrier limiting the clinical application of zirconia-toughened alumina (ZTA) ceramics in total hip arthroplasty (THA). To address this limitation, we developed a novel series of ZTA ceramics through an energy-efficient microwave sintering process, employing ZnO at concentrations of 0–2.5 wt% as a multifunctional sintering additive. We systematically investigated the effects of ZnO content on phase composition, microstructure, and mechanical performance enhancement were systematically elucidated. The results showed introducing ZnO into ZTA significantly enhanced its overall performance. At the optimal ZnO content of 0.5 wt%, the composite achieved a relative density of 98.41%, a Vickers microhardness of approximately 1903.2 HV, and a flexural strength of 882.34 MPa. The enhancement of these properties stems from the dual role of zinc oxide: promoting densification and grain refinement. The in situ formed plate-like ZnAl₂O₄ spinel grains contribute to toughening through crack deflection and the pull-out effect. However, excessive introduction of spinel phases was found to compromise the overall material performance. Microwave sintering significantly improved the densification of ZTA ceramics at 1 500 °C compared to conventional sintering methods. Our findings demonstrate the potential of ZnO incorporation and microwave sintering in improving the properties of ZTA ceramics and provides a new strategy for the rapid preparation of high-performance ZTA ceramics.

Keywords

microwave sintering / ZTA ceramics / mechanical properties / microstructure

References

[1] Li Y X, Gong Y L, Li Q, et al.Study of Cu-doped Zirconia Toughened Alumina Ceramics (Cu-ZTA) Subject to Lubrication Behaviors for Arthroplasty[J]. Ceramics International, 2024, 50(17): 31 691-31 699.

[2] Mahmood A A, Gafur M A, Hoque M EEffect of MgO on the Physical, Mechanical and Microstructural Properties of ZTA-TiO₂ Composites[J]. Materials Science and Engineering: A, 2017, 707: 118-124.

[3] Bapanapalle C O, Prajapati P K, Sadhu K K, et al.Simultaneous Effect of Microwave Sintering and TiO₂ Addition on Sinterability, Mechanical Properties, and Scratch Resistance of Zirconia Toughened Alumina Ceramics[J]. Ceramics International, 2024, 50(23): 49 782-49 791.

[4] Tan P, Yang Y, Sui Y, et al.Influence of CeO₂ Addition on the Microstructure and Mechanical Properties of Zirconia-Toughened Alumina (ZTA) Composite Prepared by Spark Plasma Sintering[J]. Ceramics International, 2020, 46(6): 7 510-7 516.

[5] Yang Z, Yang L, Wang P, et al.Effect of Sintering Aid Combined Vacuum Infiltration on the Properties of Al₂O₃-based Ceramics via Binder Jetting[J]. Additive Manufacturing, 2024, 79: 103 898.

[6] Li S, Ge L, Gu H, et al.Sinterability and Electrical Properties of ZnO-doped Ce_0.8Y_0.2O_1.9 Electrolytes Prepared by an EDTA-citrate Complexing Method[J]. Journal of Alloys and Compounds, 2011, 509(1): 94-98.

[7] Liu Y, Lao LStructural and Electrical Properties of ZnO Doped 8 mol% Yttria-Stabilized Zirconia[J]. Solid State Ionics, 2006, 177159-163.

[8] Eqbal A, Chakrabarti TStudy on the Electrochemical Effect of ZnO Addition on Flash Sintering of 3 mol% Yttria Stabilized Zirconia[J]. Journal of the European Ceramic Society, 2023, 43(14): 6 260-6 271.

[9] Li Y, Guo L, Chen L, et al.Effect of Zn(OH)₂ on Properties of Corundum Based Castables Bonded with Calcium Aluminate Cement[J]. Ceramics International, 2021, 47(1): 57-63.

[10] Cherkasova N, Veselov S, Bataev A, et al.Structure and Mechanical Properties of Ceramic Materials Based on Alumina and Zirconia with Strontium Hexaaluminate Additives[J]. Materials Chemistry and Physics, 2021, 259: 123 938.

[11] Necina V, Pabst WInfluence of the Heating Rate on Grain Size of Alumina Ceramics Prepared via Spark Plasma Sintering (SPS) [J]. Journal of the European Ceramic Society, 2020, 40(10): 3 656-3 662.

[12] Suleiman B, Zhang H, Ding Y, et al.Microstructure and Mechanical Properties of Cold Sintered Porous Alumina Ceramics[J]. Ceramics International, 2022, 48(10): 13 531-13 540.

[13] Chaix J MPomeroy MMicrowave Sintering of Ceramics. Encyclopedia of Materials: Technical Ceramics and Glasses, 2021, Oxford: Elsevier, 327-341. M]

[14] Abbas M K G, Ramesh S, Sara Lee K Y, et al.Densification of Copper Oxide Doped Alumina Toughened Zirconia by Conventional Sintering[J]. Ceramics International, 2022, 48(5): 6 287-6 293.

[15] Oghbaei M, Mirzaee OMicrowave Versus Conventional Sintering: A Review of Fundamentals, Advantages and Applications[J]. Journal of Alloys and Compounds, 2010, 494(1–2): 175-189.

[16] Mishra R R, Sharma A KMicrowave-material Interaction Phenomena: Heating Mechanisms, Challenges and Opportunities in Material Processing[J]. Composites Part A: Applied Science and Manufacturing, 2016, 81: 78-97.

[17] Gil-Flores L, Salvador M D, Penaranda-Foix F L, et al.Microstructure and Mechanical Properties of 5.8 Ghz Microwave-Sintered ZrO₂/Al₂O₃ Ceramics[J]. Ceramics International, 2019, 45(14): 18 059-18 064.

[18] Branson D LKinetics and Mechanism of the Reaction between Zinc Oxide and Aluminum Oxide[J]. Journal of the American Ceramic Society, 1965, 48(11): 591-595.

[19] Bouhamed H, Baklouti SSynthesis and Characterization of Al₂O₃/ZnO Nanocomposite by Pressureless Sintering[J]. Powder Technology, 2014, 264: 278-290.

[20] Aidhy D S, Liu B, Zhang Y, et al.Chemical Expansion Affected Oxygen Vacancy Stability in Different Oxide Structures from First Principles Calculations[J]. Computational Materials Science, 2015, 99: 298-305.

[21] Eqbal A, Chakrabarti TStudy on the Electrochemical Effect of ZnO Addition on Flash Sintering of 3 Mol% Yttria Stabilized Zirconia[J]. Journal of the European Ceramic Society, 2023, 43(14): 6 260-6 271.

[22] Yin Z, Huang C, Zou B, et al.Study of the Mechanical Properties, Strengthening and Toughening Mechanisms of Al₂O₃/TiC Micro-nano-composite Ceramic Tool Material[J]. Materials Science and Engineering: A, 2013, 577: 9-15.

[23] Liu Q, Fan G, Tan Z, et al.Reinforcement with Intragranular Dispersion of Carbon Nanotubes in Aluminum Matrix Composites[J]. Composites Part B: Engineering, 2021, 217: 108 915.

[24] Zuo F, Carry C, Saunier S, et al.Comparison of the Microwave and Conventional Sintering of Alumina: Effect of MgO Doping and Particle Size[J]. Journal of the American Ceramic Society, 2013, 96(6): 1 732-1 737.

[25] Xue J X, Shu R, Liao Y H, et al.Pressureless Sintering of HfB₂-based Ceramics as Control Rod Materials: Synergistic Effects of the Sintering Additive and Solid Solution[J]. Ceramics International, 2022, 48(1): 1 191-1 196.

[26] Zhang C, Zhu C, Shin S, et al.Enhancement of Recrystallization Texture in Non-equiatomic Fe-Ni-Co-Al-based High Entropy Alloys by Combination of Annealing and Cr Addition[J]. Journal of Alloys and Compounds, 2018, 768277-286.

[27] Hou X, Li X, Liu M, et al.Molten Salt Synthesis and Formation Mechanism of Magnesium Aluminate Spinel Using Different Shape Al₂O₃ as the Templets[J]. Ceramics International, 2019, 45: 14 397-14 403.

[28] Yan S, Yin Z, Yuan J, et al.Microstructure and Properties of Submicron Grained Alumina Ceramic Tool Material Prepared by Two-Step Microwave Sintering[J]. Ceramics International, 2018, 44(14): 17 479-17 485.

[29] Chen Y, Fan B, Yang B, et al.Microwave Sintering and Fracture Behavior of Zirconia Ceramics[J]. Ceramics International, 2019, 45(14): 17 675-17 680.

[30] Bhattacharya M, Basak TA Review on the Susceptor Assisted Microwave Processing of Materials[J]. Energy, 2016, 97: 306-338.

[31] Marcomini R F, Souza D M P F DMicrostructural and Electrical Features of Yttrium Stabilised Zirconia with ZnO as Sintering Additive [J]. Materials Research, 2016, 19(1): 45-50.

[32] Chen C, Ma Q, He C, et al.Effects of MgO and Fe₂O₃ Additives on the Microstructure and Fracture Properties of Aluminium Titanate Flexible Ceramics[J]. Ceramics International, 2023, 49(12): 19 806-19 816.

[33] Qiao Z, Li S, Li Y, et al.Fabrication, Structure, and Physical Properties of Three-B-Site Perovskite Ba(Zr_1–2xTi_xCe_x)O₃[J]. Journal of Alloys and Compounds, 2024, 1004: 175 835.

[34] Vishista K, Gnanam F DMicrostructural Development of SrAl₁₂O₁₉ in Alumina–strontia Composites[J]. Journal of the European Ceramic Society, 2009, 29(1): 77-83.

[35] Bakhtierkhalzi M, Wahedul Islam M, Suzauddin M, et al.Effect of TiO₂ as Sintering Additive on Microstructural, Physical, and Mechanical Properties of Ceo₂ Doped Zirconia Toughened Alumina Ceramic Composite[J]. Ceramics International, 2023, 49(4): 6 666-6 670.

[36] Azhar A Z A, Mohamad H, Ratnam M M, et al.The Effects of MgO Addition on Microstructure, Mechanical Properties and Wear Performance of Zirconia-toughened Alumina Cutting Inserts[J]. Journal of Alloys and Compounds, 2010, 497(1–2): 316-320.

[37] Vishista K, Gnanam F DEffect of Strontia on the Densification and Mechanical Properties of Sol-Gel Alumina[J]. Ceramics International, 2006, 32(8): 917-922.

[38] Zhang F, Chevalier J, Olagnon C, et al.Slow Crack Growth and Hydrothermal Aging Stability of an Alumina-toughened Zirconia Composite Made from La₂O₃-doped 2Y-TZP[J]. Journal of the European Ceramic Society, 2017, 37(4): 1 865-1 871.

[39] Wu D, Yu X, Zhao Z, et al.One-step Additive Manufacturing of Ticp Reinforced Al₂O₃–ZrO₂ Eutectic Ceramics Composites by Laser Directed Energy Deposition[J]. Ceramics International, 2023, 49(8): 12 758-12 771.

[40] Hong Y, Bai M, Wang S, et al.Improved Ageing-resistance and Fracture Toughness of Zirconia-toughened Alumina Bioceramics via Composition and Microstructure Design[J]. Journal of the European Ceramic Society, 2023, 43(5): 2 208-2 221.

[41] Rejab N A, Azhar A Z A, Kian K S, et al.Effects of MgO Addition on the Phase, Mechanical Properties, and Microstructure of Zirconia-toughened Alumina Added with CeO₂ (ZTA-CeO₂) Ceramic Composite[J]. Materials Science and Engineering: A, 2014, 59518-24.

[42] Yin Z, Yuan J, Wang Z, et al.Preparation and Properties of an Al₂O₃/Ti (C, N) Micro-nano-composite Ceramic Tool Material by Microwave Sintering[J]. Ceramics International, 2016, 42(3): 4 099-4 106.

[43] Sun X, Li J, Guo S, et al.Intragranular Particle Residual Stress Strengthening of Al₂O₃-SiC Nanocomposites[J]. Journal of the American Ceramic Society, 2005, 88: 1 536-1 543.

[44] Yang M, Wang H, Chen R, et al.Comparison of the Microwave and Conventional Sintering of Li₂TiO₃ Ceramic Pebbles[J]. Ceramics International, 2018, 44(16): 19 672-19 677.

[45] Charmond S, Carry C P, Bouvard DDensification and Microstructure Evolution of Y-Tetragonal Zirconia Polycrystal Powder During Direct and Hybrid Microwave Sintering in a Single-Mode Cavity[J]. Journal of the European Ceramic Society, 2010, 30(6): 1 211-1 221.

[46] Laughlin D EMagnetic Transformations and Phase Diagrams[J]. Metallurgical and Materials Transactions A, 2019, 50(6): 2 555-2 569.

[47] Li Y, Yang Y, Qing Y, et al.Enhancing ZnO-NP Antibacterial and Osteogenesis Properties in Orthopedic Applications: A Review[J]. International Journal of Nanomedicine, 2020, 15: 6 247-6 262.

[48] Bužarovska A, Dinescu S, Lazar A D, et al.Nanocomposite Foams Based on Flexible Biobased Thermoplastic Polyurethane and ZnO Nanoparticles as Potential Wound Dressing Materials[J]. Materials Science and Engineering: C, 2019, 104: 109 893.

[49] Wang Z, Wang X, Wang Y, et al.NanoZnO-modified Titanium Implants for Enhanced Anti-Bacterial Activity, Osteogenesis and Corrosion Resistance[J]. Journal of Nanobiotechnology, 2021, 19(1): 353-375.

[50] Zhu Y, Liu K, Deng J, et al.3D Printed Zirconia Ceramic Hip Joint with Precise Structure and Broad-Spectrum Antibacterial Properties [J]. International Journal of Nanomedicine, 2019, 145 977-5 987.

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