Haiyang Zhu , Renli Fu , Simeon Agathopoulos , Jun Fang , Guojun Li , Qinjiang He
{"title":"Crystallization behaviour and properties of BaO-CaO-B2O3-SiO2 glasses and glass-ceramics for LTCC applications","authors":"Haiyang Zhu , Renli Fu , Simeon Agathopoulos , Jun Fang , Guojun Li , Qinjiang He","doi":"10.1016/j.ceramint.2018.03.003","DOIUrl":null,"url":null,"abstract":"<div><p><span>The influence of BaO content (up to 15 mol%) on the crystallization behaviour, structure, thermal properties and microwave dielectric properties of the BaO-CaO-B</span><sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub> glasses and glass-ceramics system was investigated. The glasses were produced by melting at 1400 °C and quenching into water, and the glass-ceramics were produced via heat treatment at temperatures between 750 and 800 °C. The results of X-ray diffraction analysis showed that increasing the BaO content raised the resistance of the glass against crystallization and favoured the transformation of β-CaSiO<sub>3</sub> and α-CaSiO<sub>3</sub> phases, which crystallized in the Ba-free and in low BaO content compositions, into SiO<sub>2</sub> and Ba<sub>4</sub>Si<sub>6</sub>O<sub>16</sub><span>, which crystallized in compositions with higher concentrations of BaO. The BaO content had little influence on the glass transition temperature (</span><em>T</em><sub>g</sub>) and the linear coefficient of thermal expansion (CTE), but strongly reduced the softening point (<em>T</em><sub>s</sub>). Even the addition of BaO as minor additives resulted in a dramatic reduction of the <em>T</em><sub>s</sub>; for example, the <em>T</em><sub>s</sub><span> decreased from 902 °C for the Ba-free composition to 682 °C for the BaO-containing one (5%). Low values of the dielectric constant (5.9 ≤ </span><em>ε</em><sub>r</sub> ≤ 6.63) and dielectric loss (1.12 × 10<sup>−3</sup> ≤ tan<em>δ</em> ≤ 3.15 × 10<sup>−3</sup>) were measured.</p></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"44 9","pages":"Pages 10147-10153"},"PeriodicalIF":5.6000,"publicationDate":"2018-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.ceramint.2018.03.003","citationCount":"29","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Ceramics International","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0272884218305510","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, CERAMICS","Score":null,"Total":0}
引用次数: 29
Abstract
The influence of BaO content (up to 15 mol%) on the crystallization behaviour, structure, thermal properties and microwave dielectric properties of the BaO-CaO-B2O3-SiO2 glasses and glass-ceramics system was investigated. The glasses were produced by melting at 1400 °C and quenching into water, and the glass-ceramics were produced via heat treatment at temperatures between 750 and 800 °C. The results of X-ray diffraction analysis showed that increasing the BaO content raised the resistance of the glass against crystallization and favoured the transformation of β-CaSiO3 and α-CaSiO3 phases, which crystallized in the Ba-free and in low BaO content compositions, into SiO2 and Ba4Si6O16, which crystallized in compositions with higher concentrations of BaO. The BaO content had little influence on the glass transition temperature (Tg) and the linear coefficient of thermal expansion (CTE), but strongly reduced the softening point (Ts). Even the addition of BaO as minor additives resulted in a dramatic reduction of the Ts; for example, the Ts decreased from 902 °C for the Ba-free composition to 682 °C for the BaO-containing one (5%). Low values of the dielectric constant (5.9 ≤ εr ≤ 6.63) and dielectric loss (1.12 × 10−3 ≤ tanδ ≤ 3.15 × 10−3) were measured.
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.