Method for strengthening and toughening lithium disilicate glass ceramic and activating surface of lithium disilicate glass ceramic by utilizing ion exchange

Abstract

The invention discloses a method for strengthening and toughening lithium disilicate glass ceramic and activating the surface of the lithium disilicate glass ceramic by utilizing ion exchange. The method comprises the steps of 1, preparing mixed salt of NaNO3 and KNO3; 2, heating and melting to a liquid state to obtain mixed bath salt; 3, cooling along with the furnace, keeping the constant temperature, and immersing into lithium disilicate glass ceramic for ion exchange treatment; and 4, conducting ultrasonic cleaning after washing, and obtaining the toughened and surface-activated lithium disilicate glass ceramic. By adopting ion exchange treatment, Li < + > on the lithium disilicate glass ceramic surface layer and Na < + > in the mixed bath salt are exchanged due to chemical potential difference to generate residual compressive stress, so that the strengthening and toughening effect is realized, and the mechanical property is improved. Meanwhile, the composition and energy state of the lithium disilicate glass ceramic surface layer are changed, the exchanged Na < + > has a greater dissolution tendency in biological fluid, the surface activation effect on the lithium disilicate glass ceramic is realized, and the lithium disilicate glass ceramic has a wide application prospect in the field of bone repair.

Description

Technical field [0001] The present invention belongs to the field of biomedical materials, and more particularly to a method of utilizing ion exchange on lithium silicate glass ceramic ceramic ceramic ceramic ceramic ceramics. Background technique [0002] Lithium silicate glass ceramics is an important medical repair material, which has good chemical stability, processability, is a very potential bone deficiency repair or small bone alternative material. However, Reference 1 (Daguano JK, Milesi MT, Rodas AC, Weber AF, Sarkis JE, Hortellani MA, Zanotto ED.In vitrobiocompatibility of new bioactive lithia-silica glass-ceramics.MaterialsScience and Engineering: C, 2019,94: 117 -1251) and 2 (Ye J, Wen C, Wu J, Wen N, Sa BS, Zhang T.Mechanical and bioactive properties of lithium disilicate glass-ceramic mixtures synthesized by two different methods.Journal of Non-Crystalline Solids, 2019, 509: 1-9) Point out that the lack of biological inertness and mechanical properties of lithium li...

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Reference 4 (Riaz M, Zia R, Saleemi F, Ahmad R, Hussain T. Influence of Titanium on Structural, Biological and Antibacterial Properties of SiO 2 -CaO-Na 2 O-P 2 o 5 Glass-ceramics.MaterialsToday:Proceedings,2015,2(10):5313-5317), reference 5 (Kargozar S, Mozafari M, Ghodrat S, Fiume E, Baino F. Copper-Containing Bioactive Glasses and Glass-Ceramics:From Tissue Regeneration to Cancer Therapeutic Strategies. Materials Science and Engineering: C, 2021, 121: 111741.) and reference 6 (Kang T-Y, Seo J-Y, RyuJ-H, Kim K-M, Kwon J-S. Improvement of the mechanical and biological properties of bioactive glasses by the addition of zirconium oxide (ZrO2) as a synthetic bone graft substitute. Journal of Biomedical Materials Research Part A, 2020: 37113) pointed out that the dissolution of active alkali ions and biological activity can be improved theoretically by adjusting the chemical composition and ratio of glass ceramics improvement, but it will have a greater risk of maintaining the mechanical properties of glass ceramics

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