红外大直径成型多晶锗北京有色金属研究总院采用模铸定向凝固新工艺，研制成功了φ１８８～２５７ｍｍ成型多晶锗。该法可直接获得所需尺寸的透镜毛坯，与目前普遍采用的由单晶或多晶锭经切割、滚圆和磨削而成型透镜毛坯相比，省去了切、滚、磨等加工工序，简化了工艺，节... Infrared large diameter polycrystalline germanium Beijing Nonferrous Metal Research Institute using casting directional solidification of new technology, the successful development of φ188 ~ 257mm forming polycrystalline germanium. The method can directly obtain the lens blank of the required size, and eliminates the processing steps of cutting, rolling, grinding and the like compared with the commonly used method for cutting the lens blank formed by cutting, rounding and grinding single crystal or polycrystalline ingot. Simplify the process, section ...