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Preparation, Crystallization and Mechanical Properties of Potassium Aluminosilicate glass-ceramics

Journal of Wuhan University of Technology(Materials Science) 2024年第3期39卷 587-595页

作者：郑伟宏黄猛 GAO Zipeng ZHANG Hang YUAN Jian TIAN Peijing PENG Zhigang State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China Shahe Research Institute of glass Technology Shahe 054100China

In this study,transparent K_(2)O-Al_(2)O_(3)-SiO_(2)(KAS)glass-ceramics with leucite as the main crystalline phase were prepared by melting-quench method and two-step heat treatment.The effects of SiO_(2)/Al_(2)O_(3) ratio and heat treatment on crystallization and mechanical properties were studied.The crystallization kinetics and X-Ray Diffraction(XRD)results showed that SiO_(2)/Al_(2)O_(3) ratio and heat treatment system had a direct impact on the crystallization behavior of potassium aluminosilicate glass-ceramics.When heat-treated at 680℃/2 h and 780℃/1 h,cracks generated on the surface of the sample with the addition of SiO_(2)/Al_(2)O_(3)=4.8(in mol)due to the huge difference in the coefficient of thermal expansion between glass matrix and surface.When the addition of SiO_(2)/Al_(2)O_(3)(in mol)was 4,the sample with leucite as the main crystalline phase showed an excellent fracture toughness(1.46 MPa·m^(0.5))after the heat treatment of 680℃/2 h and 780℃/5 h.And there was a phase transformation from kaliophilite to leucite.The crystalline phases of the sample heat-treated at 680℃/8 h and 780℃/1 h were leucite and kaliophilite,which resulted in the visible light transmittance of 63%and the fracture toughness of 0.91 MPa·m^(0.5).Furthermore,after the heat treatment of 680℃/2 h and 780℃/5 h,the main crystalline phase of the sample with SiO_(2)/Al_(2)O_(3)=3.2(in mol)was still kaliophilite.Because leucite only grows on the surface of the sample and is hard to grow inward,it is hard to achieve the bulk crystallization of leucite in the sample with SiO_(2)/Al_(2)O_(3)=3.2(in mol).

关键词： leucite glass-ceramic kaliophilite crystallization kinetics

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Preparation and Characterization of glass-ceramic Basalt Fiber

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Journal of Harbin Institute of Technology(New Series) 2022年第6期29卷 27-33页

作者： Lida Luo Tan Yan Jin Liu Linfeng Ding Qingwei Wang Wan Jiang State Key Laboratories for Modification of Chemical Fiber and Polymer Materials Donghua UniversityShanghai 201620China Engineering Research Center of Advanced glass Manufacturing Technology Ministry of EducationDonghua UniversityShanghai 201620China Institute of Functional Materials Donghua UniversityShanghai 201620China

Basalt fiber(BF)is widely applied in the construction industry to improve the mechanical properties of construction materials.Recent studies show that BF has the potential to further enhance its performance via a crystallization approach.In this work,the glass-ceramic basalt fibers(GCBFs)were prepared through nucleation and crystallization treatments according to the crystallization kinetics calculations.Results from XRD and SEM show that GCBFs have main crystalline phases of Diopside and Augite reach crystallinity of around 46%±10%.In particular,the GCBFs sample with the largest mean crystal size maintains the lowest tensile strength of~197 MPa(compared with the pristine BFs of~737 MPa).Moreover,the weight loss and ion dissolution of GCBFs were explored in seawater environments and it was investigated that,GCBFs have better anti-seawater corrosion than the pristine BFs and have the potential to apply in the marine industry.

关键词： glass-ceramic basalt fiber tensile strength crystallization seawater environment

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Joining dense Si3N4 to porous Si3N4 by using an anorthite based glass-ceramic

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Science China(Technological Sciences) 2020年第8期63卷 1538-1548页

作者： FANG Jian ZHANG Jie LIU ChunFeng SUN LiangBo GUO SongSong WANG DongBao School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Center of Analysis and Measurement Harbin Institute of TechnologyHarbin 150001China

This study focuses on the design,characterization and testing of a novel anorthite based glass-ceramic solder for joining dense Si3N4 and porous Si3N4 ceramic.It was found that the glass solder possesses a favorable wetting ability on two ceramic surfaces.Additionally,the influence of crystallization treatment on the microstructure and shear strength of joints was investigated.The results showed that CaAl2 Si2O8 was the main product in the seam.After crystallization treatment,the crystallinitiy of the seam and shear strength of joints were improved obviously.The shear strength of joints after crystallization was 52 MPa at room temperature,and it increased to 59 MPa at 850℃.Finally,the joining mechanism of the dense Si3N4/glass-ceramic/porous Si3N4 bonded joints was proposed.Intergranular diffusion of elements was identified as the main mechanism of bonding in the interface of dense Si3N4/glass-ceramic.In the porous Si3N4 side,the bonding was achieved by infiltration that was controlled by capillarity and resistance of the viscous forces.

关键词： Si3N4 ceramic glass-ceramic joining microstructure shear strength

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Preparation of Long-Lasting Phosphorescence (LLP) glass-ceramic Materials

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Journal of Rare Earths 2004年第1期22卷 67-69页

作者：李成宇苏锵王淑彬 Key Laboratory of Rare Earth Chemistry and Physics School of Chemistry and Chemical Engineering Zhongshan University Guangzhou 510275 China

Three kinds of glass-ceramics, i.e., Mn 2+ doped zinc borosilicate, Eu 2+, Dy 3+ co-doped strontium aluminoborate and Eu 2+, Nd 3+ co-doped calcium aluminoborate were prepared, whose phosphorescence emission band peaks at 525, 516 and 464 nm, respectively. In preparation of these glass-ceramics the base glasses were gained by heating the mixed starting materials at high temperature to get the transparent glasses; then those glasses were heat-treated and turned to opaque glass-ceramics. X-ray diffraction (XRD) shows that the crystallites are ZnSiO 4, SrAl 2O 4 and α-CaAl 2B 2O 7, respectively. It is a useful way to get new LLP materials by the method reported in this work that may be considered as “from glass to crystal”.

关键词： optics luminescence glass-ceramic heat-treatment long-lasting phosphorescence rare earths

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Effects of Na_2O content on crystallization and dielectric properties of Na_2O-PbO-Nb_2O_5-SiO_2 glass-ceramic

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Rare Metals 2006年第Z2期25卷 246-249页

作者： GAO Jian MAO Changhui DU Jun TANG Qun Advanced Electronic Materials Institute General Research Institute for Non-Ferrous Metals Beijing 100088 China Advanced Electronic Materials Institute General Research Institute for Non-Ferrous Metals Beijing 100088 China Advanced Electronic Materials Institute General Research Institute for Non-Ferrous Metals Beijing 100088 China Advanced Electronic Materials Institute General Research Institute for Non-Ferrous Metals Beijing 100088 China

Na2O-PbO-Nb2O5-SiO2 glass-ceramic were synthesized by melt-quench process. The crystallization processing of the dielectric phases were carried out at temperature range from 750 to 900 ℃. The effects of Na2O content on crystallization and dielectric properties of Na2O-PbO-Nb2O5-SiO2 glass-ceramic were investigated by means of differential thermal analysis(DTA), X-ray diffraction (XRD) and dielectric constant measurements. The results show that Pb2Nb2O7, NaNbO3 and PbNb2O6 are the crystallization phases which would be formed from the Na2O-PbO-Nb2O5-SiO2 glass at the temperature range from 750 to 900 ℃. For a definite Na2O content, the dielectric constant increases with crystallization temperature. The initial crystallization temperature of NaNbO3 phase decreases with the increase of Na2O content, leading to the increase of dielectric constant of the glass-ceramic. Formation of PbNb2O6 phase at 850 and 900 ℃ would greatly increase the dielectric constant of Na2O-PbO-Nb2O5-SiO2 glass-ceramics, but the increase of Na2O content will inhibit the crystallization of PbNb2O6 phase.

关键词： glass-ceramic crystallization dielectric constant

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Effect of Au film pre-deposited at different durations as inner electrode on the electrical properties and interface microstructures of Na_2O-PbO-Nb_2O_5-SiO_2 multi-layer glass-ceramic capacitors

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Acta Metallurgica Sinica(English Letters) 2011年第6期24卷 449-456页

作者： Jun ZHU Jun LUO Qingmeng ZHANG Jun DU Advanced Electronic Materials Institute General Research Institute for Nonferrous Metals Beijing 100088 China

To further study the effect of sputtered Au film as transition electrode layer on the electrical properties and interface microstructures of Na20-PbO-Nb2O5-SiO2 multilayer glass-ceramic capacitors, Au films pre-deposited at different time were prepared by DC magnetron sputtering. Compared with the single paste electrode structure, samples with Au films pre-deposited from 6 to 18 min have the consistent perfor- mance to effectively improve the electrical properties of the capacitors, resulting in the doubled breakdown strength, an increase of equivalent capacitance by 22% and a decrease of leakage current by an order of magnitude. SEM observations indicate that the Au films with deposition time from 6 to 18 min would all help the formation of a dense electrode/dielectric interface and inhibit the diffusion of Ag. The results reveal that Au film pre-deposited for 6 min as inner electrode was sufficient to improve the interface microstructure and therefore to inhibit the Ag diffusion and enhance the overall performance of the multi-layer glass-ceramic capacitors.

关键词： Inner electrode Deposition time glass-ceramic Multi-layer capacitor

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Dielectric and impedance properties of sintered magnesium aluminum silicate glass-ceramic

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Journal of Advanced ceramics 2013年第1期2卷 71-78页

作者： Abhijit PRASAD Amitabha BASU Department of Applied Physics Indian School of MinesDhanbad 826004India

Magnesium aluminum silicate(MgO-Al_(2)O_(3)-SiO_(2),MAS)glass-ceramic was prepared via sintering route.X-ray diffraction(XRD)analysis indicates the formation of multiphase compound with magnesium silicate fluoride and cordierite as major phases.Dielectric studies of the compound shows a strong frequency dispersion of permittivity in the low frequency region followed by a nearly frequency-independent behavior in the high frequency region.The presence of alkali ions(K+)in MAS glass-ceramic results in higher dielectric constant and higher losses.Dielectric loss(tanδ)seems to be reduced at higher frequencies after reaching the instrumental saturation at 1 kHz.Electrical properties of the material have been studied using a complex impedance spectroscopy(CIS)technique in a wide temperature(30-500℃)and frequency(100 Hz-5 MHz)ranges.The complex impedance plots reveal the contribution of bulk as well as grain boundary effects in it.The bulk resistance,evaluated from complex impedance spectrum,has been observed to decrease with the rise in temperature,showing a typical negative temperature coefficient of resistance(NTCR)behavior.The smaller activation energy(Ea)of the compound within moderate temperature range suggests the presence of ions(K^(+)and F^(-))and singly ionized oxygen vacancies in the conduction process.The nature of variation of the electrical conductivity,and the values of activation energy of different temperature regions,suggest that the conduction process is of mixed type.

关键词： glass-ceramic conductivity dielectric properties electrical properties

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RESEARCH AND PRODUCTION OF glass-ceramic DECORATED MATERIAL CONTAINING CHROMIUM

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Journal of Wuhan University of Technology(Materials Science) 2000年第3期15卷 41-46页

作者：程金树 Wuhan University of Technology China Sch. of Mat. Science and Technology Wuhan University of Technology Wuhan 430070 China

In this paper, the influences of catch-color agent content on glass-ceramic decorated material in the system of CaO-Al2O3-SiO2 were studied. By ladder temperature furnace and sintering shrinkage curve measurement . the influence of catch-color agent content on sintering and crystallization temperature was discussed. By means of XRD, three point bending strength and density measurement, the properties of the decorated material were investigated.

关键词： glass-ceramic catch-color agent: sintering crystallization

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Effect of the Cool System on Internal Stress of CaO-Al_2O_3-SiO_2 glass-ceramic System

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Journal of Wuhan University of Technology(Materials Science) 2007年第4期22卷 760-763页

作者：何峰 Key Laboratory of Silicate Materials Science and Engineering of Ministry of Education(Wuhan University of Technology)

The samples were attained through altering the cooling system of producing glass-ceramics. The X-ray diffraction was used to test the stress value of different samples. The relation of the cooling system and internal stress were also investigated. The experimental results show that the stress of glass-ceramic had a close relation with starting cool temperature. Above 800 ~C, glass-ceramic could be accelerated cooling and did not bring stress. Temperature between 500 ℃ and 800℃ was an important temperature range of the formation of stress in glass-ceramic, in which the glass-ceramic stress would change obviously. Cool system was the key on how to control and eliminate internal stress in order to reduce the destroy of materials crated by internal stress. In addition, glass particles size increase, glass-ceramic stress increase in consequent.

关键词： CaO-Al203-SiO2 system glass-ceramic internal stress cooling system

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Preparation and Microstructure of glass-ceramics and ceramic Composite Materials

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Journal of Wuhan University of Technology(Materials Science) 2008年第4期23卷 562-565页

作者： HE Feng XIE Junlin HAN Da School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China

The technology and microstructure of glass-ceramics and ceramic composite materials were studied. A suitable ceramic body was chosen on the basis of the sintering temperature of CaO-Al2O3-SiO2 system glass-ceramics. According to the expansion coefficient of the ceramic body, that of CaO-Al2O3-SiO2 system glass-ceramics was adjusted, fl-wollastonite was found present as the major crystalline phase in glass- ceramic. The CaO-Al2O3-SiO2 system glass-ceramic layer and ceramic body could be sintered together by adjusting the sintering period. The compositions of glass-ceramic layer and ceramic body diffuse mutually at 1 100 ℃, resulting in an interface between them. To achieve good sintered properties of glass-ceramics and the chosen ceramic body, at least a four-hour sintering time is used.

关键词： CaO-Al2O3-SiO2 system glass-ceramic ceramic body

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