x B2O3-10SiO 2-10Na2O(x =50,60,70,80,90)system glasses were prepared using conventional melt quenching technology.The structure of borosilicate glass was analyzed by IR with different content of B2O3 . The thermal expansion coefficient,transition temperature,softening temperature and high temperature viscosi-ty were tested.The results showed that it is difficult for the borosilicate glasses with high content B2O3 to crys-tallize;with the content of B2O3 increasing,[BO3 ]and [BO4 ]increased sharply and the main products were [BO3 ];the thermal expansion coefficient presented a S type change,while the transition temperature,soften-ing temperature and high temperature viscosity decreased;both dielectric constant and dielectric loss appeared minimal value (5.1 9 for dielectric constant and 3.584×10 -4 for dielectric loss at 1 MHz),the excess content of B2O3 would be counterproductive.

Glass-ceramic materials of the Li2O-ZnO-SiO2 system, with various amounts of TiO2 added, have been prepared. The appropriate heat treatment temperatures were selected according to the information provided by the differential thermal analysis (DTA). X-ray diffraction (XRD) analysis demonstrated that in the LZS glass-ceramics system, the main phases are Li2ZnSiO4, cristobalite, tridymite and quartz. The scanning electron microscopy (SEM) revealed that crystals appear as lamellar and spherical particles in the glass-ceramics samples. In addition, the average coefficient of the thermal expansion (CTE) values first decreased, then increased and finally tended to flatten. When the content of TiO2 increased to 6%, the CTE value decreased to 9.15×10-6/K, reached the lowest value. When the content of TiO2 increased to 10%, the CTE value reached highest value 13.90×10-6/K.

本文介绍了浮法锡槽污染的来源及当前国内外各种锡槽吹扫方法的原理和优缺点.通过对锡槽内相关化学反应热力学参数的变化进行分析,确定氯气吹扫锡槽可能发生的化学反应.并采用扫描电子显微镜(SEM)和x射线能谱仪(EDS)对氯气吹扫锡槽作业后玻璃板表面的滴落物和一些玻璃样片进行性质表征.结果表明,锡槽污染最终的沉积物主要以SnO、SnS、SnO2、SnS2的物质形态存在,此类沉积物是引起浮法玻璃锡缺陷的关键.锡槽污染机理和氯气吹扫方式的研究可为高端玻璃生产线锡槽保护与污染治理提供科学的参考依据.

The glass-ceramics were produced via heat treatment from bulk base glass at the appropriate treatment temperatures provided by the differential thermal analysis (DTA) measurement. The effect of nucleation on crystallization kinetics has been explored. It is found that nucleation indeed decreased the activation energy of crystallization. X-ray diffraction (XRD) analysis demonstrated that the main crystalline phase was magnesium alumino-silicate (MgAl2Si3O10), Scanning electron microscopy (SEM) morphology showed that the crystals were needle-like in all the samples.

Li 2 O-Al 2 O 3 -SiO 2 glass-ceramics doped with Nd 2 O 3 were prepared by the melting method. The effects of Nd 2 O 3 on the crystallization behavior of Li 2 O-Al 2 O 3 -SiO 2 glass-ceramics were studied by DTA, XRD and SEM. With the increase of Nd 2 O 3 content, the glass crystallization temperature arised. The SEM result indicates that the main crystal phase of Li 2 O-Al 2 O 3 -SiO 2 glass-ceramics doped with Nd 2 O 3 is β-quartz solid solution, for without doping Nd 2 O 3 it is β-spodumene solid solution. These results shows that the crystallization temperature increases significantly by doping Nd 2 O 3 , and phase transition from β-quartz to β-spodumene is suppressed. The grain size increases with the increase of Nd 2 O 3 content.

The glass-ceramics were produced via heat treatment from bulk base glass at the appropriate treatment temperatures provided by the differential thermal analysis (DTA) measurement. The effect of nucleation on crystallization kinetics has been explored. It is found that nucleation indeed decreased the activation energy of crystallization. X-ray diffraction (XRD) analysis demonstrated that the main crystalline phase was magnesium alumino-silicate (MgAl2Si3O10), Scanning electron microscopy (SEM) morphology showed that the crystals were needle-like in all the samples.

The mechanism of the increased crystallization stability (the difference between glass incipient crystallization temperature and transition temperature) of Sb2O3 —doped vanadium phosphate sealing glass investigated by X-ray photoelectron spectroscopy (XPS) is reported in the present study. Experimental results showed that after doping with Sb2O3, the rate of bridging oxygen increased while the rate of no-bridging oxygen decreased, and the ratio of V4+/Vtotal also increased, too. This two changes led to the break of V=0 bond which is essential for the formation of V2O5 crystalline phase, thus inhibited the formation of that crystalline phase and improved glass crystallization stability.

Li2O-Al2O3-SiO2 glass-ceramics doped with Nd2O3 were prepared by the melting method. The effects of Nd2O3 on the crystallization behavior of Li2O-Al2O3-SiO2 glass-ceramics were studied by DTA, XRD and SEM. With the increase of Nd2O3 content, the glass crystallization temperature arised. The SEM result indicates that the main crystal phase of Li2O-Al2O3-SiO2 glass-ceramics doped with Nd2O3 is β-quartz solid solution, for without doping Nd2O3 it is β-spodumene solid solution. These results shows that the crystallization temperature increases significantly by doping Nd2O3, and phase transition from β-quartz to β-spodumene is suppressed. The grain size increases with the increase of Nd2O3 content.