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材料工程  2010 

冷喷涂中氮和氦混合气体对颗粒加速作用的模拟研究

, PP. 12-15

Keywords: 冷喷涂,混合气体,拉伐尔喷管,数值模拟

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Abstract:

采用FLUENT软件数值模拟氮和氦混合气体在拉伐尔喷管内对颗粒的加速过程,并与一维等熵定常流动理论值进行比较,同时研究混合气体中氦气含量对喷管出口处气体以及颗粒的速度和温度的影响。结果表明喷管中气体参数的模拟值和一维理论值比较吻合,可以预计颗粒的出口参数,指导冷喷涂工艺。随着混合气体中氦气含量的升高,气体和颗粒的出口速度不断提高,温度不断降低,但速度和温度的变化率不断减小,在氮气中加入少量氦气可以提高气体和颗粒的出口速度,同时避免了全部使用氦气加速时的高成本。

References

[1]  ASSADI H,GARTNER F,STOLTENHOFF T,et al.Bonding mechanism in cold gas spraying[J].Acta Materialia,2003,51(15):4379-4394.
[2]  李文亚,李长久,王豫跃,等.冷喷涂Cu粒子参量对其碰撞变形行为的影响[J].金属学报,2005,41(3):282-286.
[3]  李文亚,李长久.冷喷涂特性[J].中国表面工程,2002,54(01):12-16.
[4]  LI W Y,LIAO H,DOUCHY G,et al.Optimal design of a cold spray nozzle by numerical analysis of particle velocity and experimental validation with 316L stainless steel powder[J].Materials & Design,2007,28(7):2129-2137.
[5]  JODOIN B,RALETZ F,VARDELLE M.Cold spray modeling and validation using an optical diagnostic method[J].Surface and Coatings Technology,2006,200(14-15):4424-4432.
[6]  RICHER P,Z IGA A,YANDOUZI M,et al.CoNiCrAlY microstructural changes induced during cold gas dynamic spraying[J].Surface and Coatings Technology,2008,203(3-4):364-371.
[7]  GRUJICIC M,TONG C,DEROSSET W S,et al.Flow analysis and nozzle-shape optimization for the cold-gas dynamic-spray process[J].Proceedings of the Institution of Mechanical Engineers,Part B:Journal of Engineering Manufacture,2003,217(11):1603-1613.
[8]  FLUENT INC.Fluent 6.3 user's guide[M].Lebanon NH,USA:Centerra Resource Park,2006.
[9]  章华兵,张俊宝,单爱党,等.气体温度对冷喷涂Ni颗粒结合与变形行为的影响[J].金属学报,2007,43(08):823-828.
[10]  DYKHUIZEN R C,SMITH M F.Gas dynamic principles of cold spray[J].Journal of Thermal Spray Technology,1998,7(2):205-212.
[11]  王晓放,李芳,赵爱娃,等.喷嘴出口截面形状对冷喷涂涂层性能影响的数值分析[J].机械工程材料,2006,(12):84-86.
[12]  YOON S,KIM H J,LEE C.Deposition behavior of bulk amorphous NiTiZrSiSn according to the kinetic and thermal energy levels in the kinetic spraying process[J].Surface and Coatings Technology,2006,200(20-21):6022-6029.
[13]  BALANI K,LAHA T,AGARWAL A,et al.Effect of carrier gases on microstructural and electrochemical behavior of cold-sprayed 1100 aluminum coating[J].Surface and Coatings Technology,2005,195(2-3):272-279.

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