[논문]Effect of Processing Parameters and Powder Size on Microstructures and Mechanical Properties of Y2O3 Coatings Fabricated by Suspension Plasma Spray

Kim, Sun-Joo; Lee, Jung-Ki; Oh, Yoon-Suk; Kim, Seongwon; Lee, Sung-Min

doi:10.4191/kcers.2015.52.6.395

Effect of Processing Parameters and Powder Size on Microstructures and Mechanical Properties of Y2O3 Coatings Fabricated by Suspension Plasma Spray 원문보기

한국세라믹학회지 = Journal of the Korean Ceramic Society, v.52 no.6, 2015년, pp.395 - 402

Kim, Sun-Joo (Engineering Ceramic Team, Korea Institute of Ceramic Engineering and Technology) , Lee, Jung-Ki (Engineering Ceramic Team, Korea Institute of Ceramic Engineering and Technology) , Oh, Yoon-Suk (Engineering Ceramic Team, Korea Institute of Ceramic Engineering and Technology) , Kim, Seongwon (Engineering Ceramic Team, Korea Institute of Ceramic Engineering and Technology) , Lee, Sung-Min (Engineering Ceramic Team, Korea Institute of Ceramic Engineering and Technology)

Abstract ▼ AI-Helper

The suspension plasma spray (SPS) technique has been used to obtain dense $Y_2O_3$ coatings and to overcome the drawbacks of the conventional air plasma spray (APS). SPS uses suspensions containing micrometer or sub-micrometer sized powders dispersed in liquid media. In this study, microstructure developments and mechanical properties have been investigated as functions of particle size of source material and plasma processing parameters such as plasma power and stand-off distance. The microstructure of the coating was found to be highly related to the particle size and the plasma processing parameters, and it was directly reflected in the hardness and the adhesion strength. When fine powder (BET $16.4m^2/g$) was used as a raw material in the suspension, there was, with increasing stand-off distance, a change from a dense structure with a slightly bumpy surface to a porous structure with a cauliflower-like surface. On the other hand, when a coarse powder (BET $2.8m^2/g$) was used, the coating density was lower, with microscopic splats on the surface. Using fine $Y_2O_3$ powders, the coating layer with an optimum short stand-off distance showed a high hardness of approximately 90% of that of sintered $Y_2O_3$ and an adhesion strength several times higher than that of the coating by conventional APS.

주제어

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제안 방법

In order to investigate the other cause of monoclinic Y₂O₃ crystallization, the oxygen to yttrium ratios were measured using X-ray photoelectron spectroscopy. To quantify the ratio, bulk Y₂O₃ sintered under atmospheric condition was used as a reference and its O/Y ratio was normalized to 1.

대상 데이터

In this study, Y₂O₃ raw materials with different particle sizes were used for a suspension plasma spray. In addition, the effects of the plasma processing parameters, such as the plasma power and the stand-off distance were examined in terms of the microstructural development of the coatings.
Two types of Y2O3 powders were used: fine Y2O3 powder (99.99%, D50: 1.04 μm, High Purity Chemicals, Japan) and coarse Y2O3 powder (99.99%, D50: 5.03 μm, High Purity Chemicals, Japan).

이론/모형

High magnification microstructures were obtained through transmission electron microscopy (TEM, Tecnai F20, FEO, USA). TEM samples were prepared by the focused ion beam method (FIB, NOVA 200, FEI COMPANY, USA).
An average of 5 indentations was considered as the hardness. The adhesion bond strength of the coating was measured using the pullout method. Coated surface was bonded to a metal coupon with a diameter of 8 mm using epoxy adhesive (ENSURE CP-7406, Foto polymer, Singapore).

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