等离子喷涂用纳米结构T'相8YSZ球形喂料及应用展望

Nanostructured T' Phase 8YSZ Spherical Feedstocks for Plasma Spraying and Application Prospects

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.