催化剂含量对球磨退火法制备氮化硼纳米管形貌及产率的影响  

Effect of catalyst content on morphology and productivity of boron nitride nanotubes synthesized by ball milling and annealing method

作　　者：李艳娇 秦忠宝 杜海霞 王力群 刘顾 王龙 LI Yanjiao;QIN Zhongbao;DU Haixia;WANG Liqun;LIU Gu;WANG Long(Basic Department,Rocket Force University of Engineering,Xi’an 710025,China;School of Science,Xi’an Jiaotong University,Xi’an 710049,China;Zhijian Laboratory,Rocket Force University of Engineering,Xi’an 710025,China)

机构地区：[1]火箭军工程大学基础部,西安710025 [2]西安交通大学理学院,西安710049 [3]火箭军工程大学智剑实验室,西安710025

出　　处：《材料工程》2023年第11期111-119,共9页Journal of Materials Engineering

基　　金：国家自然科学基金项目(51905542)。

摘　　要：以氧化硼、氨气为反应原料,铁粉或镁粉为催化剂,采用球磨退火法制备了氮化硼纳米管,研究铁或镁含量变化对氮化硼纳米管形貌及产率的影响。结果表明:当氧化硼前驱体中不含催化剂时,可获得产率很低、均匀细小的氮化硼纳米管。适量铁可以起到良好的催化作用,退火后生成大量尺寸均匀的氮化硼纳米管。随着铁含量的增加,产物产率降低,形貌从尺寸均匀的氮化硼纳米管变为长短粗细都不均匀的氮化硼纳米管。当氧化硼与铁含量的摩尔比达到1∶1时,产物产率增加,形貌从表面光滑的氮化硼纳米管变为表面垂直生长大量氮化硼纳米片的珊瑚状氮化硼微纳米结构,其直径也明显增加。镁含量变化只对产物尺寸大小、均匀性及产率有所影响,对形貌没有明显影响。氮化硼纳米管的上述形貌和产率变化规律可以用气-液-固生长机理来解释。Boron nitride nanotubes were prepared by ball milling and annealing method using boron oxide and ammonia as raw materials and iron or magnesium powder as catalyst.The effect of iron or magnesium content on morphology and yield of boron nitride nanotubes was studied.The results show that uniform fine boron nitride nanotubes can be obtained by annealing process when the precursor of boron oxide does not contain catalyst,but the yield is very low.Appropriate iron can play a good catalytic role,a large number of boron nitride nanotubes with uniform size can be obtained.With the increase of iron content,the productivity of the product decreases and the morphology of the annealed products changes from boron nitride nanotubes with uniform size to boron nitride nanotubes with uneven diameter and length.When the molar ratio of boron oxide and iron content reaches 1∶1,the productivity of the product increases and the morphology of them changes from smooth boron nitride nanotubes to coral-like boron nitride micro-nanostructures with a large number of boron nitride nanosheets growing vertically on the surface of boron nitride nanotubes,and the diameter of the product increases obviously.The change of magnesium content only affects the size,uniformity and productivity of the product,no effect on morphology was observed.Changes in morphology and yield of boron nitride nanotubes can be explained by gas-liquid-solid growth mechanism.

关 键 词：催化剂含量 氮化硼纳米管 珊瑚状氮化硼微纳米结构 球磨退火法 形貌 产率 

分 类 号：TQ031.2[化学工程]