Preparation and characterization of lithium disilicate glass-ceramics derived from sol-gel route with varied agitation speeds

IF 3.5 2区医学 Q2 ENGINEERING, BIOMEDICAL

Journal of the Mechanical Behavior of Biomedical Materials Pub Date : 2025-09-30 DOI:10.1016/j.jmbbm.2025.107218

Yaming Zhang , Xinyi Bai , Ding Li , Xi Liu , Xigeng Lyu , Fu Wang

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Abstract

Lithium disilicate (LD) glass-ceramics were fabricated through conventional sol-gel and pressureless sintering methods, with the influence of stirring speeds (200, 400, 600 and 1000 rpm) on their microstructural evolution, phase formation, and mechanical properties being systematically investigated. The variation in agitation speed significantly affected the agglomerated sizes and morphological characteristics of the gel-derived LD powers, which in true induced noticeable differences in phase compositions and crystallinities of both the precursor powers and the final glass-ceramics. These morphological variations directly correlated with the archived relative densities of the sintered LD glass-ceramics, and the mechanical property variations were also linked with the differing aspect ratios of the precipitated LD crystals within the microstructures. Optimal performance was obtained at the stirring speed of 400 rpm, yielding glass-ceramics with exceptional properties: highest relative density (94.01 ± 0.16 %), flexural strength (182.72 ± 1.5 MPa), hardness (3.84 ± 0.20 GPa), and fracture toughness (3.07 ± 0.17 MPa·m^1/2). These finding demonstrated that mechanical stirring parameters profoundly influenced the characteristics of gel-derived LD powders and resultant glass-ceramics, suggesting potential applicability of this process control strategy to other gel-derived lithium silicate materials, including Li₂SiO₃ and Li₄SiO₄.

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溶胶-凝胶法制备不同搅拌速度的二硅酸锂微晶玻璃

采用溶胶-凝胶法和无压烧结法制备了二硅酸锂（LD）微晶玻璃，系统研究了搅拌速度（200、400、600和1000 rpm）对其显微组织演变、相形成和力学性能的影响。搅拌速度的变化显著影响了凝胶衍生LD粉体的团聚尺寸和形态特征，从而导致了前驱体粉体和最终微晶玻璃的相组成和结晶度的显著差异。这些形态变化与烧结LD微晶玻璃的相对密度直接相关，力学性能的变化也与微观结构中析出LD晶体的不同长宽比有关。在400 rpm的搅拌速度下获得最佳性能，得到的微晶玻璃具有优异的性能：最高的相对密度（94.01±0.16%）、抗弯强度（182.72±1.5 MPa）、硬度（3.84±0.20 GPa）和断裂韧性（3.07±0.17 MPa·m1/2）。这些发现表明，机械搅拌参数深刻地影响了凝胶衍生LD粉末和所得微晶玻璃的特性，表明该过程控制策略可能适用于其他凝胶衍生的硅酸锂材料，包括Li2SiO3和Li4SiO4。

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来源期刊

Journal of the Mechanical Behavior of Biomedical Materials 工程技术-材料科学：生物材料

CiteScore

7.20

自引率

7.70%

发文量

505

审稿时长

46 days

期刊介绍： The Journal of the Mechanical Behavior of Biomedical Materials is concerned with the mechanical deformation, damage and failure under applied forces, of biological material (at the tissue, cellular and molecular levels) and of biomaterials, i.e. those materials which are designed to mimic or replace biological materials. The primary focus of the journal is the synthesis of materials science, biology, and medical and dental science. Reports of fundamental scientific investigations are welcome, as are articles concerned with the practical application of materials in medical devices. Both experimental and theoretical work is of interest; theoretical papers will normally include comparison of predictions with experimental data, though we recognize that this may not always be appropriate. The journal also publishes technical notes concerned with emerging experimental or theoretical techniques, letters to the editor and, by invitation, review articles and papers describing existing techniques for the benefit of an interdisciplinary readership.