MgO对Li2O-Al2O3-SiO2系统低膨胀微晶玻璃性能的影响

利用X射线衍射分析、扫描电镜、差热分析等测试手段,结合梯温炉实验、热膨胀系数的测定,研究了MgO对Li2O-Al2O3-SiO2系统低膨胀微晶玻璃的玻璃熔制、析晶性能及热膨胀性能的影响.     

Li2O在玻璃输液瓶配方中的应用

本文介绍了含Li2O玻璃输液瓶配方的设计、应用以及经济效益分析。     

Li2O,La2O3含量对Li2O—La2O3—Ta2O5—SiO2系统玻璃析？…

电极玻璃的析晶性能是直接影响电极制作的重要因素,本文通过析晶实验,利用Ｘ射线衍射分析对Ｌｉ２Ｏ－Ｌａ２Ｏ３－Ｔａ２Ｏ５－ＳｉＯ２系统玻璃的析晶性能进行了研究,结果表明：引入适量的Ｌｉ２Ｏ、Ｌａ２Ｏ３能改善该系统玻璃的析晶性能。     

热处理制度对Li2O—Al2O3—SiO2系统玻璃析晶及热膨胀系数的影响

采用传统熔融冷却法获得了以P2O5为成核剂的Li2O-Al2O3-SiO2系统基础玻璃，通过差热分析确定了使该玻璃微晶化的热处理条件，并获得了不同热处理温度下Li2O-Al2O3-SiO2系统低膨胀微晶玻璃；利用X射线衍射分析和扫描电子显微镜对晶化试样的物相和微观结构进行了研究，讨论了热处理制度对玻璃的析晶及热膨胀系数的影响，研究结果表明：以P2O5为成核剂，采用不同热处理制度能获得Li2-Al2O3-SiO2系统低膨胀微晶玻璃；在析晶初始温度下进行热处理，析出β-石英晶体，但晶体生长缓慢，结晶程度低；提高晶化温度，析出β-锂辉石晶体且晶体生长迅速。     

热处理对CaO-Al2O3-SiO2系微晶玻璃性能影响

以CaO-A l2O3-SiO2为主要原料,采用烧结法制备出微晶玻璃.利用DSC确定了核化温度和晶化温度.利用XRD和SEM研究微晶玻璃的物相组成和显微结构.通过研究热处理温度对微晶玻璃性能的影响,可得出在780℃核化1h、948℃晶化2h时,微晶玻璃的性能最好.     

SrO-Al2O3-SiO2系统微晶玻璃的晶化行为及性能

通过改变玻璃成分,在不同的热处理制度下制备SrO-Al2O3-SiO2系统微晶玻璃,用DTA、XRD、SEM等手段对该系统微晶玻璃材料的析晶过程进行了研究。在此基础上,讨论了晶化行为对微晶玻璃的热学及力学性能的影响。结果表明:材料的热学性能及力学性能与玻璃成分及热处理制度密切相关。可以找到某一确定组分的基础玻璃,经过较低的核化温度与较高晶化温度热处理后,能够得到力学性能优良、热学性能较好的微晶玻璃材料。     

Li2O—Al2O3—SiO2系统光敏微晶玻璃的低温热处理

主要研究和探讨了Ｌｉ２Ｏ－Ａｌ２Ｏ３－ＳｉＯ２系统光敏微晶玻璃热处理制度及曝光时间对其析晶晶相及其在氢氟酸中侵蚀的作用和影响，并通过Ｘ衍射等手段分析研究了其低温析晶晶相。     

组成对Li2O-Bi2O3-WO3-B2O3系统玻璃性能的影响

采用传统的熔融冷却法制备了Li2O-Bi2O3-WO3-B2O3系统玻璃,对玻璃的电导率、质量密度和硬度进行了研究.结果表明,在Li2O-Bi2O3-WO3-B2O3系统玻璃中,固定n(Bi):n(B)=3:2,当Li2O摩尔分数保持不变时,随着WO3摩尔分数的增加,玻璃的质量密度增大,硬度减小;当WO3摩尔分数保持不变时.随着Li2O摩尔分数的增加,玻璃的质量密度和硬度先增大后减小,在Li2O摩尔分数为13%时达到最大值,出现了硼反常现象,质量密度最大值为6.6 g/cm3,硬度最大值为401.6 HV.     

Li2O-B2O3-SiO2系统微晶玻璃制备及晶化机制

采用传统的熔融后冷却并恒温热处理的方法可获得组成为(1-x) Li2O·2B2O3·xSiO2 (x=0,0.05,0.1,0.15,0.2)的微晶玻璃,利用TDA,XRD,SEM及IR等测试方法研究了其显微组织结构.结果表明,在热处理过程中,表面晶化占主导地位,晶化过程由内部定向进行;SiO2的加入有利于晶相向Li2B4O7转化;结晶厚度、晶粒尺寸、与玻璃组成、热历史、表面状态、热处理制度及内部物质的扩散等因素有关.     

Li_2O、La_2O_3含量对Li_2O-La_2O_3-Ta_2O_5-SiO_2系统玻璃析晶性能的影响

电极玻璃的析晶性能是直接影响电极制作的重要因素 ,本文通过析晶实验 ,利用X射线衍射分析对Li2 O La2 O3 Ta2 O5 SiO2 系统玻璃的析晶性能进行了研究。结果表明 :引入适量的Li2 O、La2 O3能改善该系统玻璃的析晶性能。     

Li2O-B2O3-SiO2系电绝缘封接玻璃的研制

以Li2O-B2O3-SiO2系统为基础,添加少量外加剂,制备了结晶型电绝缘封接玻璃.测试表明,该电绝缘封接玻璃在540℃以下是电绝缘的,其热膨胀系数为109×10-7℃-1,主晶相为Li2O·SiO2.     

THE STRUCTURE AND PROPERTIES OF Li2O-Al2O3-SiO2 LOW EXPANSION GLASS CERAMICS CONTAINING B2O3

Through measuring the coefficient of linear expansion, the structure and properties of the Li2O-Al2O3-SiO2 low expansion glass ceramics containing B2O3 are studied by JR and XRD. It is shoutn that the IR method is efficient in the study of the glass-ceramics structure. There is a " Boron abnormality" in the system which has an important influence on the properties of the glass-ceramics.     

Effect of crystallization of CaO—P2O5—SiO2—MgO—F^— glass—ceramics on its mechanical properties

The microstructure of CaO-P2O5-SiO2-MgO-F glass-ceramics during crystallization were investigated and the crystallized phases were identified with DTA(Differential Thermal Analysis),SEM(Scanning Electron Microscope) and XRD(X-ray Diffraction) techniques,The mechanical properties such as bending strength and fracture toughness,as well as their changes with advancing crystallization were determined.The results show that the changes of the mechanical properties are correlated with the microstructures,The sample heated up to 810℃ and soaked for 4h has smaller crystalline size and less volum fraction of fluorophlogopite,so it has higher bending strength (about 190MPa),and higher crack toughness(about 2.63 MPa.m^1/2).     

B2O3对锂铝硅系统微晶玻璃结构性能的影响

采用差热分析(DTA),X-ray衍射分析(XRD),扫描电镜分析(SEM)等手段研究热处理制度对锂铝硅透明微晶玻璃热膨胀系数的影响。结果表明,随B2O3含量的增加,玻璃的熔化温度降低,熔化质量提高。经处理后的微晶玻璃样品,随B2O3含量的增加,透明性变差。当B2O3的含量超过3%时,出现比较严重的分相现象。微晶玻璃的主晶相为LixAlxSi1-xO2固溶体。     

Thermal behavior and lithium ion conductivity of L2O-Al2O3-TiO2-SiO2-P2O5 glass-ceramics

A lithium ion conductive solid electrolyte, L2O-Al2O3-TiO2-SiO2-P2O5 glass with NASICON-type structure have been synthesized and transformed into glass-ceramic through thermal-treatment at various temperatures from 700 to 1 000 ℃ for 12 h. The differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM) and complex impedance techniques were employed to characterize the samples. The experimental results indicated that the capability of glass forming in this system is superior to that of L2O-Al2O3-TiO2-P2O5. The glass has an amorphous structure and resultant glass-ceramic mainly consisting of LiTi2(PO4)3 phases. Impurity phases AlPO4, TiO2, TiP2O7 and unidentified phase were observed. With the enhanced heat-treatment temperature, grain grew gradually and lithium ion conductivity of glass-ceramics increased accordingly, the related impedance semicircles were depressed gradually and even disappeared, which could be analytically explained by the coordinate action of the ’Constant phase element’ (CPE) model and the ’Concept of Mismatch and Relaxation’ model (CMR). When the sample is devitrified at 1 000 ℃, the maximum room temperature lithium ion conductivity comes up to 4.1×10-4 S/cm, which is suitable for the application as an electrolyte of all-solid-state lithium batteries.     

尖晶石锂锰氧化物的电化学性能研究

以LiOH.H2O和Mn(CH3COO)2.2H2O为原料,用微波烧结和固相烧结相结合合成了尖晶石型Li4Mn5O12正极材料.XRD分析、DTA分析、循环伏安和充放电实验表明,先用300W的微波烧结30min,然后再用380℃后处理48 h可获得具有纯Li4Mn5O12物相的样品.该样品的初始放电容量为176mAh/g,40循环的放电容量为123 mAh/g.