Effects of heat pressing on microstructure and mechanical properties of lithium disilicate glass ceramics with different crystal morphology

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2025-03-01 DOI:10.1016/j.ceramint.2024.12.289

Ding Li , Ming Zhou , Yaming Zhang , Meng Meng , Xiaocheng Li , Xigeng Lyu , Bin Qin , Fu Wang , Zhenzhen Zhang

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引用次数: 0

Abstract

The purpose of this study is to investigate effects of heat pressing on microstructure and mechanical properties of lithium disilicate glass ceramics with different crystal morphology. Lithium disilicate glass-ceramics (LD) were melted to form precursory glass blocks, which were crystallized by two-step heat treatment. The second steps at 900 °C, 915 °C, and 930 °C (below, equal to and above the heat pressing temperature) were designed for specimens in group G1–G3 (n = 20, per group) respectively to form LD. Then specimens in group G1–G3 were heat-pressed at 915 °C to form Group G1p, G2p and G3p. Six groups of glass ceramics were characterized using X-ray diffraction (XRD) and subsequently evaluated via flexural strength testing, nanoindentation testing, and toughness measurements. The microstructures and fracture morphologies were analyzed using scanning electron microscopy (SEM). One-way analysis of variance (ANOVA) was used to analyze the data. After heat pressing, the crystal size of LD in G1p was larger than that in G1, while these was no significant changes from G2 to G2p, or from G3 to G3p. The crystals displayed varying degrees of oriented distribution along their long axis after heat pressing: mild in G1p, pronounced in G2p and G3p. G1p showed lower flexural strength than G1, whereas G2p exhibited higher flexural strength than G2 (p < 0.05). G1p, G2p, and G3p exhibited lower average hardness than G1, G2, and G3. The fracture toughness along the longitudinal (Gpl) direction was different from that along the transverse (Gpt) direction. As the heat treatment temperature increased, the crystal size in LD increased and crystal content declined. After heat pressing, the crystals in the 915 °C and 930 °C groups became oriented, the flexural strength increased, the fracture toughness in specific directions improved, while the hardness had no significant change.

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.