Preparation of highly dense glass-ceramic by sintering ultrafine CaO-MgO-Al2O3-SiO2-CaCl2 glass powder

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

Ceramics International Pub Date : 2025-05-01 DOI:10.1016/j.ceramint.2025.01.564

Hong-Yang Wang, Shu-Qiang Jiao, Guo-Hua Zhang

引用次数: 0

Abstract

This work prepared a highly dense glass-ceramic (GC) by the powder sintering method. The ultrafine glass powder (D₅₀ = 1.07 μm) was uniaxially pressed at 50 MPa and heat treated at 875–950 °C for densification and crystallization. According to the XRD results (X-ray diffraction analysis), the as-prepared GC was comprised of augite and anorthite. The crystallinity of GC was ranged from 1 to 90 % by changing the sintering temperature and time. It was found that increasing the crystallinity improved the bending strength, Vickers hardness, and fracture toughness of the GC provided that the crystallization did not cause an increase in porosity. The use of ultrafine powder promoted the densification and microstructure uniformity of GC. Sample sintered at 925 °C for 2 h exhibited a high crystallinity (78 %) and a low porosity (<0.1 vol%), thus showing the highest bending strength and Vickers hardness of 201 MPa and 6.82 GPa, respectively.

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超细CaO-MgO-Al2O3-SiO2-CaCl2玻璃粉烧结制备高密度玻璃陶瓷

采用粉末烧结法制备了高密度玻璃陶瓷（GC）。将D50 = 1.07 μm的超细玻璃粉在50 MPa下单轴加压，在875 ~ 950℃下热处理致密化结晶。XRD （x射线衍射分析）结果表明，制备的气相色谱主要由奥辉石和钙长石组成。通过改变烧结温度和烧结时间，GC的结晶度在1% ~ 90%之间。研究发现，在结晶不增加孔隙率的前提下，提高结晶度可以提高气相色谱的抗弯强度、维氏硬度和断裂韧性。超细粉末的使用促进了气相色谱的致密化和微观结构的均匀性。样品在925℃下烧结2 h，结晶度高（78%），孔隙率低（<0.1 vol%），弯曲强度和维氏硬度最高，分别为201 MPa和6.82 GPa。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.