Relation between deposit characteristics and ceramic coating quality in gas tunnel type plasma spraying.

Kobayashi, Akiko; Kurihara, Setsu; Habara, Yasuhiro; Arata, Yoshiaki

doi:10.2207/qjjws.8.457

Cited by 12 publications

(6 citation statements)

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“…The experimental method to produce the high hardness ceramic coatings by means of the gas tunnel type plasma spraying (Fig. 1) have described in the previous papers [6][7][8][9][10][11][12]. The spraying powder is fed inside plasma flame in axial direction from center electrode of plasma gun.…”

Section: Methodsmentioning

confidence: 99%

“…During high temperature service an oxide scale consisting mainly of α-alumina forms along bond/topcoat interface. Now, the gas tunnel type plasma spraying developed by the author has superior property as compared to the conventional type plasma spray method [6][7][8][9][10]. Usually the Vickers hardness of this sprayed coating became 20-30 % higher than that of conventional plasma spraying.…”

Section: Introductionmentioning

confidence: 99%

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Study on Improvement of Oxide Layer and Properties of Plasma Sprayed Alumina in Thermal Barrier Coatings

Kobayashi

Shanmugavelayutham

Yano

2007

SSP

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Thermal barrier coatings (TBC) have been used to improve the efficiency of turbine engine by providing the capability to sustain significant temperature gradient across the coating. TBC failure occurs easily at the interface between the metallic bondcoat and topcoat. Alumina was proposed as a potential candidate as an interlayer to improve the oxidation resistance of thermal barrier coating due to its low oxygen diffusivity against the harsh environment. The mechanical properties, thermal behaviour and high temperature oxidation resistance of the coatings formed by gas tunnel type plasma spraying were investigated in this study. The results showed that this system exhibits the improvement of mechanical properties of the coating and oxidation resistance. This interlayer is preferred in order to minimize the detrimental effect of phase transformation of γ- Al2O3 to α-Al2O3.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on Improvement of Oxide Layer and Properties of Plasma Sprayed Alumina in Thermal Barrier Coatings

Kobayashi

Shanmugavelayutham

Yano

2007

SSP

Self Cite

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“…Figure 1 shows the gas tunnel type plasma spraying torch. The experimental method to produce the high hardness ceramic coatings by means of the gas tunnel type plasma spraying have been described in the previous papers [4,5,11,12,13].…”

Section: %mentioning

confidence: 99%

“…Characteristics of gas tunnel type plasma spraying The gas tunnel type plasma spraying can make high quality ceramic coatings compared to conventional plasma spraying systems. The gas tunnel type plasma spraying torch [4,5,11,12,13]is shown in Figure 1. The coating is formed on the substrate traversed at the spraying distance: L. In this case, the gas divertor nozzle diameter was d=20 mm.…”

Section: Gas Tunnel Type Plasma Sprayingmentioning

confidence: 99%

“…New type plasma spray methods are expected for using the excellent characteristics of ceramics such as corrosion resistance, thermal resistance, and wear resistance [10] by reducing the porosity and increasing the coating density. Now, a high hardness ceramic coating could be obtained by means of the gas tunnel type plasma spraying, which were investigated in the previous study in detail [5,11,12,13]. The Vickers hardness of the zirconia (ZrO 2 ) coating was increased with decreasing spraying distance, and a higher Vickers hardness could be obtained at a shorter spraying distance.…”

Section: Introductionmentioning

confidence: 99%

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Smart coating technology by gas tunnel type plasma spraying

Kobayashi

2008

J. Phys.: Conf. Ser.

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Abstract. Nano-science & technology is one of the most important scientific fields, and the material processing using the nano-technology is now advanced towards more precise and controllable smart stage. Regarding thermal processing, plasma system with high precise, has been expected for smart thermal processing. The gas tunnel type plasma system developed by the author exhibits high energy density and also high efficiency. Among the applications to the various thermal processing, one practical application is plasma spraying of ceramics such as Al 2 O 3 and ZrO 2 . The characteristics of these ceramic coatings were superior to the conventional ones. The ZrO 2 composite coating has the possibility of the development of high functionally graded TBC (thermal barrier coating). In this study, the performance such as the mechanical properties, thermal behavior and high temperature oxidation resistance of the alumina/zirconia functionally graded TBCs produced by gas tunnel type plasma spraying was investigated and discussed. The results showed that the alumina/zirconia composite system exhibited the improvement of mechanical properties and oxidation resistance. Now, one of the advanced plasma application, a smart coating technology, is expected to obtain the desired characteristics of ceramics with improved corrosion resistance, thermal resistance, and wear resistance.

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Characteristics of high hardness alumina coatings formed by gas tunnel plasma spraying

Kobayashi

1996

JTST

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Relation between deposit characteristics and ceramic coating quality in gas tunnel type plasma spraying.

Cited by 12 publications

References 0 publications

Study on Improvement of Oxide Layer and Properties of Plasma Sprayed Alumina in Thermal Barrier Coatings

Study on Improvement of Oxide Layer and Properties of Plasma Sprayed Alumina in Thermal Barrier Coatings

Smart coating technology by gas tunnel type plasma spraying

Characteristics of high hardness alumina coatings formed by gas tunnel plasma spraying

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