Mechanical Properties and Crack Growth Behaviors of High-Temperature Protective Coatings by Low-Pressure Plasma Spray.

Itoh, Yoshiyasu; Saitoh, Masahiro; Miyazaki, Matsuo

doi:10.1299/kikaia.60.2538

Cited by 2 publications

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“…MCrAlY, where M means Co and/or Ni, coatings have been developed to protect gas turbine blades from oxidation and corrosion at high temperature. 1) Itoh et al 2,3) systematically investigated the mechanical properties of MCrAlY coatings by both four points bending test and resonance method. However, the mechanical properties of the thin MCrAlY coatings used in actual turbine system were unknown, because there was not a proper measurement method of thin sprayed coatings.…”

Section: Introductionmentioning

confidence: 99%

Development of Lateral Compression Method of Circular Tube Thin Coating for Mechanical Properties of Plasma Sprayed CoNiCrAlY

Waki

Kobayashi

2006

Mater. Trans.

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CoNiCrAlY coatings have been developed to protect gas turbine blades from oxidation and corrosion at high temperature. However, the mechanical properties of the thin CoNiCrAlY coatings used in actual turbine system were unknown, because there was not a proper measurement method of thin sprayed coatings. Lateral compression test for the circular tube coatings of plasma-sprayed thin coating was newly developed. In considering the deformation of the tubes, the elastic contact with a flat plate jig and a tube surface was taken into account as well as the bending of the curved beam of the tube. Young's moduli of well known materials obtained from the lateral compression tests agreed well with the true values. CoNiCrAlY tube specimens independent of substrates were manufactured by dissolving out the substrates by nitric acid. The thickness of coatings were selected from 150 to 700 mm. The effects of spraying particle size, spraying atmosphere and thermal treatment on mechanical properties, such as Young's modulus and bending strength, of CoNiCrAlY were examined. It was found that Young's modulus and a fracture stress increased with an increase of the coating thickness. Young's modulus was sensitive to the spraying powder size and increased with a decrease of the size. It was found that spraying with small spraying powder was the most effective in increasing the Young's modulus. It was also found that Young's modulus was governed by the porosity if thickness and process were given. It was found that thermal treatment was the most effective in increasing the bending strength.

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Section: Introductionmentioning

confidence: 99%

Development of Lateral Compression Method of Circular Tube Thin Coating for Mechanical Properties of Plasma Sprayed CoNiCrAlY

Waki

Kobayashi

2006

Mater. Trans.

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“…Many studies on a strength have been presented in this research field from the various viewpoints, as an influence of existence of a coating on fatigue strength of a substrate (3) , conditions of crack initiation of coating (5), (6) , bad influences of deterioration and crack of the coating on the base material (1), (4) , delamination strength of the coating (4), (7) . The strength of the coating's own is closely related to delamination strength between coating and substrate and these both strengths have been discussed in a confused mind.…”

Section: Introductionmentioning

confidence: 99%

Evaluations of Strength of Thermal Sprayed Coating for Complex Loading

Kaneko

Ohmori

2010

JMMP

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Fracture strength of WC-12Co thermal sprayed coating is investigated experimentally and analytically. In the experiments, one pair of butt cylindrical specimen with coating is subjected to combined tension with torsion stresses. Fracture loci were obtained for three kinds of thickness of the coating in σ-τstress plane. Stress distributions at crack tip singular point on fractured surfaces are analyzed by Finite-Element-Method and approximated by the expression σ＝KR -λ where R means normalized thickness coordinate. It is found that the normal stress distributions are common to all cases of testing stress conditions and so fracture condition of the brittle coating is represented as K≧Kcr in the normal stress distribution even under mixed deformation mode I and III. The delamination critical shear stress distribution could also be obtained.

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Mechanical Properties and Crack Growth Behaviors of High-Temperature Protective Coatings by Low-Pressure Plasma Spray.

Cited by 2 publications

References 0 publications

Development of Lateral Compression Method of Circular Tube Thin Coating for Mechanical Properties of Plasma Sprayed CoNiCrAlY

Development of Lateral Compression Method of Circular Tube Thin Coating for Mechanical Properties of Plasma Sprayed CoNiCrAlY

Evaluations of Strength of Thermal Sprayed Coating for Complex Loading

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