共查询到20条相似文献,搜索用时 0 毫秒
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Beryllium glass has been prepared for the first time, and some of its physical and optical properties have been determined. More than eighty different compositions have been melted and studied. Four series were taken from the clear glass area and examined for density, hardness, refractive index, and ultra-violet light transmission in comparison with magnesium and calcium glasses 相似文献
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玻纤增强塑料中玻纤含量的控制 总被引:3,自引:0,他引:3
张向南 《现代塑料加工应用》1997,9(5):36-39
探索了双螺杆挤出机螺杆转速、加料机转速及玻璃纤维(玻纤)加入股数与玻破纤加入量的内在关系,提出了热塑性增强塑料在造粒过程中控制玻纤含量的方法。 相似文献
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N. L. Bowen 《Journal of the American Ceramic Society》1919,2(4):261-281
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A. W. Bitting 《Journal of the American Ceramic Society》1922,5(2):85-94
For centuries glass bottles have been recognized as superior containers. At present over 4000 different sizes and shapes are being made and the industry is in a state of rapid extension. Glass containers possess the advantage of being sanitary and permitting the contents to be seen. Recently the laboratory of the Glass Container Association has tested 180 lots of beverage bottles. Some of the better types, or those approaching the champagne style, were found to withstand an end crushing pressure of from 8000 to 12000 pounds, a transverse pressure of from 800 to 1800 pounds, a hydrostatic pressure of from 400 to 1600 pounds, and an impact of a fifty-pound hammer falling from 2 to 6 feet. Similar tests are in progress on other types of containers and on the closures employed. Troubles due to alkalinity are of rare occurrence. 相似文献
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R. H. Dalton 《Journal of the American Ceramic Society》1933,16(9):425-432
An apparatus is described for extracting the gas from glass at glass-furnace temperature and determining its composition. Results are given for glasses of various compositions and various melting histories. All ordinary glasses were found to contain appreciable quantities of dissolved (or chemically combined) gas, the amount varying from a few hundredths to a few tenths per cent. Water is frequently the most abundant gas, the content being highest in borosilicate glasses. Carbon dioxide is also usually present, the amount depending on the basicity of the glass. Nitrogen, carbon monoxide, and hydrogen were never found present in appreciable quantities. All oxidized glasses contain some oxygen. Glasses containing arsenic give off a comparatively large volume of oxygen. The effect of this oxygen on fining is discussed. It has been found that remelting a glas has little effect on the gas content. The gas content is greatly influenced by the size of the melt, being the lowest in small experimental melts. 相似文献