孙 航1，贾均红1,2，杨 杰1，何乃如1，杨鑫然1，蔡粮臣1
（1. 陕西科技大学 机电工程学院，陕西 西安 710021；2. 中国科学院 兰州化学物理研究所，兰州 甘肃 730000）
DOI:10.13732/j.issn.1008-5548.2021.06.004
收稿日期： 2021-04-01，修回日期：2021-05-26，在线出版时间：2021-10-18 14:26。
基金项目：国家自然科学基金项目，编号：51675508；陕西省重点研发计划项目，编号：2019GY-173。
第一作者简介：孙航(1997—)，男，硕士研究生，研究方向为高温润滑耐磨涂层。E-mail：787796716@qq.com。
通信作者简介：贾均红(1974—)，男，博士，教授，博士生导师，研究方向为摩擦学及表面技术。E-mail：jhjia@sust.edu.cn。
摘要：通过高能球磨、喷雾造粒结合热处理的方法制备了可用于等离子喷涂的MoO3-Bi2O3(简称MB)纳米团聚复合粉体,采用激光粒度仪、霍尔流量计、高分辨场发射扫描电镜、X-射线衍射仪等方法考察球磨浆料中MB粉体的质量分数与热处理温度对复合粉体粒径分布、致密度、球形度、松装密度及流动性的影响,并在室温到800℃对该粉体所制得涂层的摩擦性能进行测试。结果表明,通过机械球磨和喷雾造粒获得粒径为33.77～54.96μm的MB纳米复合粉体;随着球磨浆料中MB粉体的质量分数的增加,喷雾造粒所得粉体形貌逐渐趋于规则球形,粒径分布先变窄再变宽,发现球磨浆料中MB粉体合适的质量分数为35%,但所得颗粒结构较为疏松不致密;实验发现,复合粉体的最佳热处理温度为500℃,此时粉体松装密度为1.98 g·cm-3,50 g粉体所需的流动时间为25.97 s,粒径为39.26～51.62μm,热处理过程中未发生固相反应产生新相;复合涂层在400℃时摩擦系数低至0.2,在600℃时磨损率低至9.28×10-5mm3/(N·m)。
关键词：高能球磨；喷雾造粒；热处理；纳米结构；等离子喷涂
Abstract：MoO3-Bi2O3(MB) nano-agglomerated composite powders for plasma spraying were prepared by high-energy ball milling and spray granulation combined with heat treatment. Using laser particle size analyzer,hall flowmeter,high-resolution field emission scanning electron microscope,X-ray diffractometer and other methods to investigate the effect of the mass fraction of MB powder in the ball mill slurry and the heat treatment temperature on the particle size distribution,density,sphericity,bulk density and fluidity of the composite powder. The friction performance of the coating made of the powder was tested at room temperature to 800 ℃ . The results showed that MB nano-structure composite powders with particle size distribution ranging from 33. 77 μm to 54. 96 μm were obtained by mechanical ball milling and spray granulation. With the increase of the mass fraction of MB powder in the ball-milling slurry,the morphology of the powders obtained by spray granulation gradually tended to be regular spherical,and the particle size distribution first narrowed and then widened. It was found that the suitable mass fraction of MB powder in the ball-milling slurry was 35%,but the structure particles of the powders obtained were loose and not dense. The results show that the optimal heat treatment temperature of the composite powder is 500 ℃,when the loose density is 1. 98 g/cm3,the flow time of 50 g powder is 25. 97 s,the particle size distribution is 39. 26 ～ 51. 62 μm,and no new phase is generated by solid phase reaction. The coating is as low as 0. 2 at 400 ℃,and the wear rate is as low as 9. 28 × 10-5 mm3/(N·m) at 600 ℃ .
Keywords：high energy ball mill; spraying-dry; heat treatment; nanostructure; plasma spraying
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