“开桶即用”特高温陶瓷金属化专用钨及其复合粉的开发

Development of Tungsten and Its Compound Powders Specialized for Ultra-High Temperature Ceramics Metallizing without Grinding

本文采用钨酸铵改性-热解-氢气还原—精细加工的工艺,制备了"开桶即用"特高温陶瓷金属化专用钨及W-Y2O3复合粉。改性后钨酸铵颗粒的费氏粒度为2.5μm,较改性前减小了超过一个数量级,且颗粒呈空心薄壁球形,该结构保证了钨粉形核、长大环境的高度一致,使粒度超细且高度均匀。在此基础上制备的W-Y2O3复合粉中,絮状、纳米尺度的Y2O3较为均匀地包覆于超细钨粉颗粒表面。专用钨及其复合粉的开发有助于提高特高温陶瓷金属化产品的质量。

The tungsten and W-y2O3 Powdersspecialized for ultra-high temperature ceramics metallizing without grinding, were prepared by the process including APT modifying, pyrolysis, hydrogen reduction, and advanced dispersion. Fisher particle size of the modified APT was 2.5μm, which decreased by more than one order of magnitude compared with that of the raw APT. The particle uniformity of ultrafine tungsten powder was improved because of hollow thin-wall spherical structure of the modified APT, which ensured homogeneous nucleation and growth conditions during hydrogen reduction. Based on this, the W-Y2O3 powder was also prepared with ultra-fine tungsten particle coated by nanoscaled Y2O3 floccules. The available-without-grinding tungsten and W-Y2O3 powders have resulted in the increase of the quality＇of ultra-high temperature metallized ceramics products.