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MANUFACTURE OF BOROSILICATE GLASS ESSENTIALLY FREE OF ALKALI AND ALKALINE EARTH METALS
MANUFACTURE OF BOROSILICATE GLASS ESSENTIALLY FREE OF ALKALI AND ALKALINE EARTH METALS
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机译：基本上不含碱金属和碱土金属的硼硅酸盐玻璃的生产
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1,213,372. Borosilicate glass. E. I. DU PONT DE NEMOURS & CO. 29 July, 1968 [31 July, 1967], No. 36152/68. Heading ClM. Borosilicate glass essentially free of alkali and alkaline earth metals is made by a method comprising heating an intimate mixture consisting of from 83 to 99À7% by weight of colloidally subdivided, amorphous silica and from 0-3 to 17% by weight of boric oxide or a source of boric oxide to provide such percentage of boric oxide, e.g. boric acid or ammonium borate, at a temperature of from 500‹ to 900‹ C. The glass contains a maximum of 0-05% by weight of alkali and alkaline earth metals. The ultimate particle diameter of the amorphous silica is less than 0-50 micron. One or more compounds which are thermally decomposable to silica or boric oxide or both and to volatile by-products can be used to form the silica-boric oxide mixtures. The time of thermal treatment can vary from one minute at the upper end of the temperature range to as much as 200 hours at the lower end. Low final temperatures between 500‹ C. and 800‹ C. yield soft to gritty powders whereas final temperatures higher than 800‹ C. produce granules or consolidated glass masses depending on the amount of B 2 O 3 present. The powders are used for forming glass fibres, laboratory apparatus, telescope mirror blanks and for sealing glasses.
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机译：1,213,372。硼硅酸盐玻璃。 E. I. DU PONT DE NEMOURS＆CO。1968年7月29日[1967年7月31日]，第36152/68号。标题ClM。基本上不含碱金属和碱土金属的硼硅酸盐玻璃是通过以下方法制成的：加热均匀混合物，该混合物包含83-99-97％重量比的胶体细分无定形二氧化硅和0-3-17％重量比的氧化硼或氧化硼源以提供一定百分比的氧化硼，例如硼酸或硼酸铵，温度为500℃至900℃。玻璃中所含碱金属和碱土金属的含量最高为0-05％。无定形二氧化硅的最终粒径小于0-50微米。可以使用一种或多种可热分解成二氧化硅或氧化硼或两者和分解成挥发性副产物的化合物来形成二氧化硅-氧化硼混合物。热处理时间可以从温度范围上限的一分钟到下限的多达200小时不等。最终温度在500°C至800°C之间时，较低的温度会产生软至粒状的粉末，而最终温度高于800°C时，则取决于存在的B 2 O 3的量而产生颗粒或固结的玻璃块。这些粉末用于形成玻璃纤维，实验室仪器，望远镜镜毛坯和用于密封玻璃。
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