CAJ | 학술논문

研究了采用硼热还原法制备LaB6粉末的反应合成工艺。La2O3-B系反应热力学分析表明，气体分压对LaB6的形成有重要影响，减小气体分压可以明显降低LaB6的合成温度；结合DTA测定结果，确定了制备LaB6粉末的合成温度。同时，对不同温度和保温时间条件下所生成的LaB6粉末的相组成、颗粒尺寸与形貌以及纯度进行了测试分析，实验结果表明，La2O3-B系制备LaB6粉末的优化工艺是真空度133Pa，1 923K保温6 h，所合成的LaB6粉末平均粒径为6μm，纯度达99.2％，颗粒形态比较规整，多数呈近似团块状。
연구료채용붕열환원법제비LaB6분말적반응합성공예。La2O3-B계반응열역학분석표명，기체분압대LaB6적형성유중요영향，감소기체분압가이명현강저LaB6적합성온도；결합DTA측정결과，학정료제비LaB6분말적합성온도。동시，대불동온도화보온시간조건하소생성적LaB6분말적상조성、과립척촌여형모이급순도진행료측시분석，실험결과표명，La2O3-B계제비LaB6분말적우화공예시진공도133Pa，1 923K보온6 h，소합성적LaB6분말평균립경위6μm，순도체99.2％，과립형태비교규정，다수정근사단괴상。
The synthesis of LaB6 powder by borothermic reduction method from the La2O3 - B system was investigated systematically in the present study. Thermodynamic analysis showed that the partial pressure of resultant gases played an important role during the formation of LaB6 powder, and that the synthetic temperature decreased notably by reducing the partial pressure. The synthetic conditions were determined combining the resulting of DTA analysis. The phase compositions of the products at different temperatures for different holding times were analyzed by X - ray diffraction, and the powder morphology and purity were examined by scanning electronic microscope and chemistry analysis separately. It is pointed out that the optimal conditions to fabricate LaB6 powder from the La2O3- B system are a holding time of 6 h at 1 923 K under 1Torr pressure, and that LaB6 powders are obtained with purity of 99.2 % and regular shape in average diameter of 6μm.