低介低温烧结玻璃／钙长石复合绝缘材料的研究

通过对低介电常数 CaO-Li2O-B2O3-SiO2-Al2O3玻璃设计及与钙长石晶体的复合优化，制备了具有低温、低介、与硅相匹配的低热膨胀系数的新型绝缘复合材料。样品在970℃烧结0．5h后，介电常数5．125，介质损耗2．48×10^-3，抗折强度105．8MPa，热膨胀系数（25～500℃）3．38×10^-6℃^-1。并研究了玻璃与钙长石加入量、显微结构等因素对材料性能的影响。     

Improving the flexural strength of porcelain by residual stress in anorthite coating

Flexural strength is an important parameter of domestic ceramics to meet the criteria for mechanized washing, filling, and sealing process in the automatic production line. In this work, the anorthite coating was prepared using calcite, silica, and alumina as raw materials. Taking the temperature with the highest matrix strength as the optimal temperature, the influences of chemical formulation on the phase composition and the coefficient of thermal expansion (CTE) of coatings were investigated. The enhancement effect of the coating with different formulations and surface number and thickness was compared. As a result, the flexural strength of the ordinary domestic ceramic body was improved due to the residual compressive stress in the coating caused by a mismatch of CTE between the coating and the matrix. At the optimal sintering temperature (1280°C), the coating with 20 mass% alumina addition has the best strengthening effect on the body, in which the thickness of the anorthite coating is approximately 50 µm and the flexural strength has increased by 64.6%, from 88 ± 4 to 144 ± 6 MPa.     

pH值对溶胶凝胶法合成钙长石超细粉末的影响

采用溶胶凝胶法合成钙长石超细粉末。利用对胶体的观察以及衍射分析技术和粒度分析技术,讨论了溶胶凝胶法制备钙长石过程中不同pH值的胶体形成凝胶情况以及对粉末粒子大小和分布的影响。研究表明,取pH=2时效果最好。     

低熔、低介玻璃粉末的初步研究

通过玻璃组成与性能关系的设计研究,以及玻璃／钙长石／莫来石复合设计,研究了合适的玻璃相种类对复合材料的介电性能等的影响。通过比较其综合性能,初步确定出性能优良的低熔、低介玻璃粉末。     

Low-Temperature Sintering and Microwave Dielectric Properties of Anorthite-Based Glass-Ceramics

TiO₂ nucleated anorthite-based glass-ceramics were fabricated from glass powders. After sintering and crystallization heat treatment, various physical properties, including apparent bulk density and water absorption, were examined to evaluate the sintering behavior of anorthite-based glass-ceramic. Results showed that the complete-densification temperature for specimens was as low as 900°C. Sufficient crystallization was achieved by subsequently raising the firing temperature to 950°C, and the dielectric quality factor was promoted to the maximum value. Contents of nucleating agent (TiO₂) played an important role in the dielectric constants. The crystallinity was controlled by raising the firing temperature at a constant heating rate. The degree of crystallization affected the dielectric properties of sintered glass-ceramics. At the resonant frequency of 10 GHz, anorthite glass-ceramics with 5 wt% TiO₂ possessed the lowest permittivity of 8 and exhibited appropriate dielectric properties as compared with those with B₂O₃ and 10 wt% TiO₂.     

叶蜡石在低温制备钙长石质陶瓷基片中的应用研究

研究了用叶蜡石、碳酸钙与适量的氧化铝,在加入添加剂的条件下,用原位反应烧结法制备出低温烧结（1200℃）的新型钙长石质陶瓷基片材料。在满足使用强度条件下,与目前常用的氧化铝质陶瓷基片相比,叶蜡石制备出的低温烧结钙长石质陶瓷基片的介电常数小,电绝缘性能好;体积密度轻,对减轻电器设备的质量有利;特别是烧成温度低,对于采用高导电率导体,像铜、银、金等引线的要求十分有利,且原料价格低,有很好的经济效益。并讨论了CaCO3原料适当的引入粒度和Al2O3的加入量的影响。     

工业废石膏在研制新型隔热材料中的应用

本文利用陶瓷厂的废石膏为主要原料,通过加入合适的添加剂,研制出性能优异的新型轻质隔热材料,废石膏的加入量可达４０ｗｔ％,开辟了工业废石膏再利用的又一新途径。     

White porcelain material based on diopside

The intention of the present study was to develop an alternative composition for making porcelain material using diopside as the main raw material. Particle size distribution, X‐ray diffraction, X‐ray fluorescence spectrometer, and field emission scanning electron microscope were carried out to characterize the body. Alfa‐quartz, diopside, anorthite, and clinoenstatite were major phases of fired sample. The flexural strength, 131.54 MPa, was two times higher than that of conventional porcelains. During firing, iron ions were diffused into diopside crystal lattice giving the porcelain body a favorable whiteness. It is applicable in preparation of porcelain material using diopside as the main raw material.