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《Chinese Journal of Rare Metals》 2014-06
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Preparation and Influence Factors of ZrO_2-MoSi_2 Agglomerated Composite Powder used for Plasma-Spraying

Zhu Langtao;Yang Jun;Zhang Qingying;Wang Jing;Han Zhihai;Yang Jianfeng;School of Metallurgical Engineering,Xi'an University of Architecture & Technology;China National Heavy Machinery Research Institute Co. ,Ltd.;School of Materials Science and Engineering,Lanzhou University of Technology;State Key Laboratory for Mechanical Behavior of Materials,Xi'an Jiaotong University;  
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 ℃.
【Fund】: 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
【CateGory Index】: TB383.3
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