Critical bonding temperature for the splat bonding formation during plasma spraying of ceramic materials

Yang, Guan-Jun; Hao, Shun; Xing, Ya-Zhe; Yang, Er‐Juan

doi:10.1016/j.surfcoat.2013.09.010

Cited by 90 publications

(26 citation statements)

References 37 publications

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“…A pyrometer (RAYR312ML3U, Raytek, Santa Cruz, CA) was used to monitor the surface temperature during spraying. Other details of the preheating setup can be found elsewhere . In addition, similar to Part I, YSZ coatings were prepared using a commercially available hollow spheroidized 8 wt% YSZ powder (HOSP, −75 to +45 μm, Metco 204B‐NS, Sulzer Metco Inc., New York).…”

Section: Methodsmentioning

confidence: 99%

A comprehensive sintering mechanism for TBCs‐Part II: Multiscale multipoint interconnection‐enhanced initial kinetics

et al. 2017

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During thermal exposure, the sintering process of the plasma‐sprayed thermal barrier coatings (PS‐TBCs) presents significant two‐stage kinetics, as reported in the Part I. As a companion study, this part aims to reveal the mechanism responsible for the ultrafast sintering kinetics when initially exposed, since the initial short stage (stage‐I) often finishes most increment of the mechanical and thermal properties. A detailed examination of the pore healing behavior was carried out, based on the experimental result in Part I that the dominant structural change at the stage‐I is the significant healing at intersplat pore tips. Results show that the smooth splat surface, which made up the wedge‐shaped intersplat pores, changed to a rough surface with multiscale convexs after high‐temperature thermal exposure. Moreover, the multiscale roughening is highly sensitive to various orientations of the columnar grains inside the splats. Subsequently, multipoint connection between the counter‐surfaces of the intersplat pores was formed by the bridging of multiscale convexs. This multiscale multipoint connection between pore surfaces significantly accelerated the healing of intersplat pores, which can be dominantly responsible for the ultrafast sintering kinetics at the stage‐I. This comprehensive sintering mechanism could offer some positive suggestions toward prolonging the thermal‐insulating effect of TBCs.

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Section: Methodsmentioning

confidence: 99%

A comprehensive sintering mechanism for TBCs‐Part II: Multiscale multipoint interconnection‐enhanced initial kinetics

et al. 2017

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“…On the one hand, the lamellar structure with limited bonding ratio exhibits good thermal insulating performance and on the other hand such feature reduces the fracture toughness of the coating. 15 In our previous study 16,17 on the formation of Al 2 O 3 and YSZ splats on the substrate with the same material as splat, it was found that there is a critical deposition temperature above which adjacent splats can be bonded together completely. Therefore, by controlling the deposition temperature, ceramic coatings with well bonded splats can be plasma sprayed at certain deposition temperature with improved coating properties.…”

Section: Introductionmentioning

confidence: 98%

“…With YSZ, as already mentioned, the coating fracture toughness can be controlled by increasing deposition temperature to over the critical bonding temperature of about 600uC. 17 However, with LZO there is no bonding formation temperature available yet.…”

Section: Introductionmentioning

confidence: 99%

Splat interface bonding formation during plasma spraying of LZO coating

Liu

Yang

et al. 2014

Materials Research Innovations

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Plasma sprayed ceramic coatings of low thermal conductivity are becoming important candidates for next generation thermal barrier coatings. The rare earth ceramic materials are regarded as promising materials which can be applied by plasma spraying. However, the lower mechanical strength of these materials compared with YSZ limits their performance during thermal cycling. The interlamellar bonding of plasma sprayed ceramic coatings dominates their mechanical properties. In this study, the rare earth ceramic LZO splats were deposited on both YSZ and LZO surfaces at different surface temperatures to reveal the effect of the deposition temperature on the splat interface bonding formation. The bonding conditions between splat and different substrates were examined from the cross-sections by fracturing the splats. It is confirmed that at low surface temperature no effective splat bonding formed between the splat and the substrate surface. It is also observed that there was a critical surface temperature over which the interface bonding begins to form. The present results will benefit the control of splat interface bonding, and thus the properties of the coatings.

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“…It was found that the critical bonding temperature is~300°C or~650°C for Al 2 O 3 or YSZ, respectively [22]. Surface & Coatings Technology 274 (2015) [37][38][39][40][41][42][43] Above all, it can be clearly seen that the splat morphology and the intersplat bonding, which determine the coating properties, can be significantly modified through increasing the substrate surface temperature [21,22]. As the splat bonding between flattened splats can be controlled, the crystalline structure becomes another critical factor that determines the properties of thermally sprayed ceramics.…”

Section: Introductionmentioning

confidence: 99%

Epitaxial grain growth during 8YSZ splat formation on polycrystalline YSZ substrates by plasma spraying

Yang

Luo

Yang

et al. 2015

Surface and Coatings Technology

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Critical bonding temperature for the splat bonding formation during plasma spraying of ceramic materials

Cited by 90 publications

References 37 publications

A comprehensive sintering mechanism for TBCs‐Part II: Multiscale multipoint interconnection‐enhanced initial kinetics

A comprehensive sintering mechanism for TBCs‐Part II: Multiscale multipoint interconnection‐enhanced initial kinetics

Splat interface bonding formation during plasma spraying of LZO coating

Epitaxial grain growth during 8YSZ splat formation on polycrystalline YSZ substrates by plasma spraying

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