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日本新技术事业团委托给东京钨公司开发的“钨单晶体的制造技术”已获成功。单晶体在3380℃下热膨胀低,可望用于激光反射镜等方面,目前已确立了可获得平坦平面的大型结晶的大批量生产技术,在世界上首次达到实用规模。钨在高温下具有优良的强度及耐久性,但多晶钨因晶界的存在而变脆,难以制得平坦的平面。因此也尝试过采用高频或电子束熔融、冷却的方法使其单晶化,但在成本以及单晶体的大小上有限度,因而作为
Japan’s new technology mission commissioned Tokyo Tungsten company developed the “tungsten single crystal manufacturing technology” has been successful. Single crystal at 3380 ℃ low thermal expansion, is expected to be used for laser mirrors and so on, has been established to obtain a flat planar large crystals of mass production technology, the world’s first practical scale. Tungsten has excellent strength and durability at high temperatures, but polycrystalline tungsten becomes brittle due to the presence of grain boundaries, making it difficult to produce flat surfaces. Therefore, attempts have also been made to single-crystallize by high-frequency or electron beam melting and cooling, but there is a limit in the cost and the size of the single crystal. Therefore,