等离子喷涂用ZrO_2-MoSi_2复合粉末的制备及其影响因素  

Preparation and Influence Factors of ZrO_2-MoSi_2 Agglomerated Composite Powder used for Plasma-Spraying

作　　者：朱浪涛[1,2] 杨军[1] 张庆莹[3] 王静[1] 韩志海[4] 杨建锋[4] 

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055 [2]中国重型机械研究院股份公司,陕西西安710032 [3]兰州理工大学材料科学与工程学院,甘肃兰州730050 [4]西安交通大学金属材料国家重点实验室,陕西西安710049

出　　处：《稀有金属》2014年第6期1043-1048,共6页Chinese Journal of Rare Metals

基　　金：西安交通大学金属材料强度国家重点实验室开放课题基金(20131314);陕西省冶金工程重点学科资助

摘　　要：选用纳米Zr O2粉末作为Mo Si2基复合材料室温增韧和高温弥散强化的第二添加相,利用喷雾造粒方法制备了用于等离子喷涂的Zr O2-Mo Si2复合粉末。采用标准漏斗法测量了复合粉末的松装密度,通过RISE-2008激光粒度分析仪测试了复合粉末的粒度及其分布,借用扫描电镜（SEM）观察了复合粉末的表面形貌与结构,结合试验测定结果及理论计算结果分别研究了起始粉末的球磨时间、料浆中固含量、粘结剂含量及分散剂含量、喷雾干燥条件对粉末造粒的影响规律。结果表明：当球磨时间为12 h时,粉末的粒度分布于1－2μm之间;当料浆成分中固含量为70%,粘结剂含量为10%,分散剂含量为1%时,料浆具有良好的流动性及稳定性;喷雾干燥过程中,进风温度为200℃,出风温度为120℃,蠕动泵速率为2 ml·min^-1,进气气压为0.2 MPa时,所制备的团聚型复合粉末成球度较高,表面致密且分散,颗粒之间无粘结现象,颗粒粒径的平均值为42μm,松装密度为2.17 g·cm^-3,经1200℃真空烧结热处理后的团聚型复合粉末具有较高的流动性。The nano Zr O2 powder was selected to the Mo Si2 composites as a second phase for toughening at room temperature and dispersion strengthening at high temperature. The Zr O2-Mo Si2 agglomerated composite powders used for air plasma spraying were prepared by spray drying method. The apparent density of the powders were measured by standard funnel method,the particle size and distribution were tested by RISE-2008 laser particle size analyzer,the surface morphology and structure of the composite powders were observed by scanning electron microscope（ SEM）. Based on the theory analysis and testing results,the effects of raw powder milling time,solid content,binder content,dispersant content,and the spray drying conditions on the powder granulation were studied. The results showed that when the milling time was 12 h,the powder size distribution was between 1 － 2 μm. The slurry had good fluidity and stability when the solid content of the slurry was 70%,the binder content was 10% and the dispersant content was 1%. As the inlet air temperature was 200 ℃,the export air temperature was 120 ℃,the peristaltic pump rate was 2 ml·min^- 1,the inlet pressure was 0. 2MPa,agglomerated composite powder prepared possessed good agglomeration degree,surface dense and dispersion,the average particle diameter of the prepared powder was 42 μm,and the apparent density of the prepared powders was 2. 17 g·cm^- 3. Specially,agglomerated composite powder had high flowability after vacuum sintering at 1200 ℃.

关 键 词：Zr O2-MoSi2复合粉末 等离子喷涂 喷雾造粒 松装密度 

分 类 号：TG178[金属学及工艺—金属表面处理]