等离子喷涂用纳米结构T'相8YSZ球形喂料及应用展望
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摘要
目的通过纳米粉体再造粒技术制备出等离子喷涂用高性能纳米结构非平衡转变四方相ZrO2-8%(8YSZ)球形喂料,以满足高端装备的需求。通过调控再造粒工艺以期应用于"两机"及陶瓷3D打印的耗材。方法以纳米8YSZ粉体为原料,通过纳米粉体再造粒技术制备出等离子喷涂用纳米结构8YSZ喂料。利用扫描电镜(SEM)、透射电镜(TEM)、X射线衍射仪(XRD)研究了纳米结构8YSZ喂料的表面形貌、晶粒尺寸以及相结构。同时测定了纳米结构8YSZ喂料的松装密度、振实密度、流动性等物性参数。结果制备的纳米结构8YSZ喂料呈球形形貌,喂料表面光滑且内部致密,喂料处于自由流状态且其粒度满足等离子喷涂要求。在纳米粉体再造粒过程中,纳米结构8YSZ喂料晶粒尺寸没有明显长大,相结构为非平衡转变四方相即T′相。结论通过对纳米粉体再造粒工艺的调控,可以制备出粒度分布与组织结构可控的高性能纳米结构T'相de8YSZ球形喂料。制备出的高性能喂料有望用于航空发动机和燃气轮机(两机)等高端装备以及用于陶瓷3D打印的耗材。
The work aims to fabricate high-performance nanostructured non-transformable tetragonal 8YSZ feedstocks used for plasma spraying to meet the demand of high-end equipment by the nanopowder regranulation technique and then apply the feedstocks as the consumables of "aero-engine and gas turbine" and ceramic 3D printing. The nanostructured 8YSZ feedstocks used for plasma spraying were prepared by the nanopowder regranulation technology with nano-8YSZ powders as raw materials. The surface morphology, grain size and phase structure of nanostructured 8YSZ feedstocks were investigated by scanning electron microscopy(SEM), transmission electron microscopy(TEM) and X-ray diffraction(XRD). Meanwhile, the apparent density, tap density and flowability of nanostructured 8YSZ feedstocks were measured. The as-prepared nanostructured 8YSZ feedstocks exhibited spherical and smooth morphology. The feedstocks had smooth surface and dense internal microstructure. The feedstocks were in free-flowing state and the particle size met the requirements for plasma spraying. The grain size of nanostructured 8YSZ feedstocks did not grow obviously in the process of the nanopowder regranulation. The phase structure of feedstocks was non-equilibrium transformation tetragonal phase, i.e. T' phase. The high performance nanostructured spherical T' phase 8YSZ feedstocks with controllable particle size distribution and microstructure can be prepared by adjusting the process of nanopowder regranulation. The as-prepared high performance feedstocks are expected to be used in high-end equipment such as aero-engines and gas turbines, as well as ceramic 3D printing consumables.
The work aims to fabricate high-performance nanostructured non-transformable tetragonal 8YSZ feedstocks used for plasma spraying to meet the demand of high-end equipment by the nanopowder regranulation technique and then apply the feedstocks as the consumables of "aero-engine and gas turbine" and ceramic 3D printing. The nanostructured 8YSZ feedstocks used for plasma spraying were prepared by the nanopowder regranulation technology with nano-8YSZ powders as raw materials. The surface morphology, grain size and phase structure of nanostructured 8YSZ feedstocks were investigated by scanning electron microscopy(SEM), transmission electron microscopy(TEM) and X-ray diffraction(XRD). Meanwhile, the apparent density, tap density and flowability of nanostructured 8YSZ feedstocks were measured. The as-prepared nanostructured 8YSZ feedstocks exhibited spherical and smooth morphology. The feedstocks had smooth surface and dense internal microstructure. The feedstocks were in free-flowing state and the particle size met the requirements for plasma spraying. The grain size of nanostructured 8YSZ feedstocks did not grow obviously in the process of the nanopowder regranulation. The phase structure of feedstocks was non-equilibrium transformation tetragonal phase, i.e. T' phase. The high performance nanostructured spherical T' phase 8YSZ feedstocks with controllable particle size distribution and microstructure can be prepared by adjusting the process of nanopowder regranulation. The as-prepared high performance feedstocks are expected to be used in high-end equipment such as aero-engines and gas turbines, as well as ceramic 3D printing consumables.
引文
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[22]NGO T D,KASHANI A,IMBALZANO G,et al.Additive manufacturing(3D printing):A review of materials,methods,applications and challenges[J].Composites Part B:Engineering,2018,143:172-196.
[2]CLARKE D R,PHILLPOT S R.Thermal barrier coating materials[J].Materials today,2005,8(6):22-29.
[3]CLARKE D R,OECHSNER M,PADTURE N P.Thermal-barrier coatings for more efficient gas-turbine engines[J].Mrs bull,2012,37(10):891-898.
[4]REN X,PAN W.Mechanical properties of high-temperature-degraded yttria-stabilized zirconia[J].Acta materialia,2014,69(5):397-406.
[5]FENG J,REN X,WANG X,et al.Thermal conductivity of ytterbia-stabilized zirconia[J].Scripta materialia,2012,66(1):41-44.
[6]GAN J A,BERNDT C C.Nanocomposite coatings:thermal spray processing,microstructure and performance[J].International materials reviews,2015,60(4):195-244.
[7]LOGHMAN-ESTARKI M R,RAZAVI R S,JAMALI H,et al.Effect of scandia content on the thermal shock behavior of SYSZ thermal sprayed barrier coatings[J].Ceramics international,2016,42(9):11118-11125.
[8]WANG L,GUO L,LI Z,et al.Protectiveness of Pt and Gd2Zr2O7 layers on EB-PVD YSZ thermal barrier coatings against calcium-magnesium-alumina-silicate(CMAS)attack[J].Ceramics international,2015,41(9):11662-11669.
[9]SCHULZ U,BRAUE W.Degradation of La2Zr2O7 and other novel EB-PVD thermal barrier coatings by CMAS(Ca O-Mg O-Al2O3-SiO2)and volcanic ash deposits[J].Surface&coatings technology,2013,235:165-173.
[10]MAUER G.Plasma characteristics and plasma-feedstock interaction under PS-PVD process conditions[J].Plasma chemistry&plasma processing,2014,34(5):1171-1186.
[11]MAUER G,JARLIGO M O,REZANKA S,et al.Novel opportunities for thermal spray by PS-PVD[J].Surface&coatings technology,2015,268:52-57.
[12]VARDELLE A,MOREAU C,AKEDO J,et al.The 2016thermal spray roadmap[J].Journal of thermal spray technology,2016,25(8):1376-1440.
[13]PRABHAKARAN K,BEIGH M O,LAKRA J,et al.Characteristics of 8 mol%yttria stabilized zirconia powder prepared by spray drying process[J].Journal of materials processing technology,2007,189(1-3):178-181.
[14]WANG L,WANG Y,SUN X G,et al.Thermal shock behavior of 8YSZ and double-ceramic-layer La2Zr2O7/8YSZthermal barrier coatings fabricated by atmospheric plasma spraying[J].Ceramics international,2012,38(5):3595-3606.
[15]LOGHMAN-ESTARKI M R,AHMADI-PIDANI R,RAZAVI R S,et al.Fabrication and evaluation of plasma-sprayed nanostructured and conventional YSZthermal barrier coatings[J].Current nanoscience,2012,8(3):402-409.
[16]WANG Y,JIANG S,WANG M,et al.Abrasive wear characteristics of plasma sprayed nanostructured alumina/titania coatings[J].Wear,2000,237(2):176-185.
[17]胡长均.纳米结构ZrO2-Y2O3和ZrO2-Y2O3-CeO2喂料及热障涂层的研究[D].哈尔滨:哈尔滨工业大学,2007.HU C J.Nano-structured ZrO2-Y2O3 and ZrO2-Y2O3-Ce O2feedstocks and TBCs[D].Harbin:Harbin Institute of Technology,2007.
[18]HAJIZADEH-OGHAZ M,RAZAVI R S,LOGHMAN-ESTARKI M R.Synthesis and characterization of nontransformable tetragonal YSZ nanopowder by means of Pechini method for thermal barrier coatings(TBCs)applications[J].Journal of sol-gel science and technology,2014,70(1):6-13.
[19]DAGGUPATI V N,NATERER G F,GABRIEL K S,et al.Effects of atomization conditions and flow rates on spray drying for cupric chloride particle formation[J].International journal of hydrogen energy,2011,36(17):11353-11359.
[20]吴静,朱丽娟,袁福河,等.K417G高温合金纳米氧化锆热障涂层的制备与性能[J].中国表面工程,2006,19(5):26-31.WU J,ZHU L J,YUAN F H,et al.Preparation and properties of nano-ZrO2 thermal barrier coating on K417Gsuperalloy[J].China surface engineering,2006,19(5):26-31.
[21]周洪.钛合金表面纳米热障涂层的制备与组织性能及其表面激光重熔的研究[D].上海:上海交通大学,2008.ZHOU H.Fabrication and performance of nanostructured thermal barrier coatings on titanium alloy substrate and surface laser-glazing of ceramic coatings[D].Shanghai:Shanghai Jiao Tong University,2008.
[22]NGO T D,KASHANI A,IMBALZANO G,et al.Additive manufacturing(3D printing):A review of materials,methods,applications and challenges[J].Composites Part B:Engineering,2018,143:172-196.
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