...Silica glass consisting only of SiO2 is the best in terms of heat resistance, but due to the high manufacturing costs, various types of heat-resistant glass are produced. Representative examples include Vycor (a registered trademark of Corning Inc., USA), which was developed to easily produce glass with a composition as close as possible to that of silica glass; borosilicate glass, which reduces the amount of alkali and alkaline earth elements that cause a decrease in heat resistance and improves the difficulty of melting by adding B2O3 ; and aluminosilicate glass, which introduces alkaline earth elements but adds Al2O3 to make the glass structure closer to that of silica glass. The representative compositions are shown in the table below. *Some of the terminology that refers to "aluminosilicate glass" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…SiO2成分のみからなる石英ガラスが耐熱性の面からは最良であるが,製造コストが高いため種々の耐熱ガラスが作られている。すなわち,石英ガラスにできるだけ近い組成のガラスを容易に製造することを目的として開発されたバイコールVycor(アメリカのコーニング社の登録商標),耐熱性低下の原因となるアルカリ,およびアルカリ土類元素の量を減少させ,溶融が困難になる点をB2O3成分を添加することによって改良したホウケイ酸系ガラス,またアルカリ土類元素を導入しつつも,ガラス構造を石英ガラスに近づけるためにAl2O3を添加したアルミノケイ酸ガラスなどが代表的なものである。表にその代表的組成を挙げる。… ※「アルミノケイ酸ガラス」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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