通过射频等离子体球化处理工艺,以不规则形状钨粉为原料,制备了球形钨粉,并研究了加料速率和粉末粒度对粉末球化率的影响.采用扫描电子显微镜、X射线衍射和激光粒度分析仪对球化处理前后粉末的形貌、物相和粒度分布进行了测试和分析.结果表明:粒度在5.5~26.5 μm范围的不规则形状钨粉,经等离子球化处理后得到表面光滑、分散性好、球化率可达100%的球形钨粉.球化处理后,粉末的粒度略微增大.随加料速率的增加,钨粉的球化率降低.随着钨粉球化率的提高,粉末的松装密度和流动性得到显著改善.松装密度由6.80 g/cm3提高到11.5 g/cm3,粉末流动性由14.12 s/50 g提高为6.95 s/50 g.
参考文献
[1] | Jiang X L;Boulos M .[J].Transactions of Nonferrous Metals Society of China,2006,16(01):13. |
[2] | Davis J W;Barabash V R;Makhankov A et al.[J].Journal of Nuclear Materials,1998,258-263(01):308. |
[3] | 沈春英,李志顺,丘泰,王玉春.浸渍型钡钨阴极用高性能铝酸盐研究[J].稀有金属材料与工程,2007(11):2057-2060. |
[4] | 卢平,沈春英,丘泰.掺杂氧化铈钡钨阴极的结构和发射性能的研究[J].稀有金属,2008(01):50-53. |
[5] | Cortenraad R.;van der Gon AWD.;Brongersma HH.;Gartner G.;Manenschijn A. .Surface analysis of thermionic dispenser cathodes[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2002(1/4):153-165. |
[6] | Kobayashi A;Sharafat S;Ghoniem NM .Formation of tungsten coatings by gas tunnel type plasma spraying[J].Surface & Coatings Technology,2006(14/15):4630-4635. |
[7] | Kumar, S;Na, H;Selvarajan, V;Lee, C .Influence of metal powder shape on drag coefficient in a spray jet[J].Current applied physics: the official journal of the Korean Physical Society,2009(3):678-682. |
[8] | T.G. Luo;X.H. Qu;M.L Qin .Dimension precision of metal injection molded pure tungsten[J].International Journal of Refractory Metals & Hard Materials,2009(3):615-620. |
[9] | Hartwig T;Veltl G;Petzoldt F et al.[J].Journal of the European Ceramic Society,1998,18(09):1211. |
[10] | Birger D .[J].Metal Powder Report,2008,63(02):12. |
[11] | Gervais Soucy;Mohamed Rahmane;Xiaobao Fan;Takamasa Ishigaki .Heat and mass transfer during in-flight nitridation of molybdenum disilicide powder in an induction plasma reactor[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2001(1/2):226-234. |
[12] | Kobayashi, N;Kawakami, Y;Kamada, K;Li, JG;Ye, R;Watanabe, T;Ishigaki, T .Spherical submicron-size copper powders coagulated from a vapor phase in RF induction thermal plasma[J].Thin Solid Films,2008(13):4402-4406. |
[13] | Boulos M .[J].Metal Powder Report,2004,59(05):16. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%