热障涂层(TBCs)在使用过程中表面陶瓷层的脱落是影响其使用寿命的关键,针对以上问题,建立了凝固生长过程流动及传热传质模型,用格子波尔兹曼法(LBM)研究了涂层凝固生长过程.结果显示:不考虑对流影响时,晶体生长的形貌呈现对称十字枝晶形状;在考虑对流的情况下,迎流部分生长快,背流部分生长受到抑制.在大的过冷度影响下,晶界出现波动,出现二次枝晶生长.等离子喷涂涂层在温度梯度下朝向正温度梯度方向呈柱状晶生长.枝晶生长受到对流的影响和侧向温度梯度的影响.迎流方向和大温度梯度方向枝晶形貌发达,背流方向和小温度梯度处枝晶生长受到抑制.
参考文献
| [1] | 韩志海,王海军,白宇,丁春华,徐滨士.超音速等离子喷涂制备细密柱晶结构热障涂层研究进展[J].热喷涂技术,2011(02):1-14,40. |
| [2] | PAWLOWSKI L.The science and engineering of thermal Spray coatings[M].West Sussex:John Wiley,2008.,2008. |
| [3] | 王秀敏,韩会民,丛吉远,王玉魁.等离子喷涂陶瓷涂层后氧化处理的研究[J].金属热处理,2000(04):32-33. |
| [4] | 赵文轮,大森明 .后氧化对陶瓷热喷涂涂层结合强度的影响[J].西安交通大学学报,1995,29(8):77-83.ZHAO W L,DA S M.After oxidation effect on bonding strength of ceramic ther`l spraying coating[J].Journal of Xi'an Jiaotong University,1995 (8):77-83.,1995. |
| [5] | FEDERER J I,VAN R M,PRICE J R .Evaluation of ceramic coatings on silicon carbide[J].Surface and Coatings Teehnology,1989,39 |
| [6] | BOULOS M I,FAUCHAIS P,PFENDER E.Thermal plasmas fundamentals and applications[M].New York:Plenum Press,1994.,1994. |
| [7] | YE R,MURPHY A B,ISHIGAKI T .Numerical modeling of an Ar-H2 radio-frequency plasma reactor under thermal and chemical nonequilibrium conditions[J].Plasma Chem Plasma Process,2007,27(1):189-204.,2007. |
| [8] | TACKE K H.Application of finite differnce enthalpy method to dendritic growth[M].Essex:Longman Si Tech,1990.,1990. |
| [9] | BELTRAN S,STEFANESCU D M .Growth of soluta ldendritcs:a cellular automaton model and its quantitative capabilities[J].Met allurgieal and Materials Transaetions A,2003,34(2):367-382.,2003. |
| [10] | ZHU P,SMITH R W .Dynamics simulation of crystal growth by monte carlo method-1:model description and kinetics[J].Acta Materialia,1992,40 |
| [11] | ZHU P SMITH R W .Dynamics simulation of crystal growth by monte carlo method-2:ingot mierostructure[J].Acta Materialia,1992,40 |
| [12] | ZHAO P,HEINRICH J C .Front-tracking finite element method for dendritic solidifcation[J].Journal of Computational Physics,2001,173 |
| [13] | ZHU M F,STEFANESCU D M .Virtual front tracking model for the quantitative modeling of dendritic growth in solidification of alloys[J].Acta Materialia,2007,55 |
| [14] | GIBOU F,FEDKIW R,CAFLISCH R,et al .A level set approch for the numerical simulation of dendritic growth[J].Journal of Scientific Computing,2003,19:183-199.,2003. |
| [15] | STEINBAEH I,SEHMITZ G J.Direct numerical simulation of solidification strueture using the Phase-field method[J].Modeling of Casting,Welding and Advanced Solidification Proeess Ⅷ,1998:521-523.,1998. |
| [16] | MILLER W,SUCCI S .A lattice boltzmann model for anisotropic crystal growth from melt[J].Journal of Statistical Physis,2002,107:173-186.,2002. |
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