Determination of high temperature mechanical properties of thermal barrier coatings by nanoindentation

Shang, Fulin; Zhang, X.; Guo, Xiaoqiang; Zhao, Pengfei; Chang, Young-Il

doi:10.1179/1743294413y.0000000227

Cited by 33 publications

(18 citation statements)

References 20 publications

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“…The crack length could be measured. Formula (1) reflects the relationship of fracture toughness and crack length according to the Nihhara relation [41]:…”

Section: Propertiesmentioning

confidence: 99%

Mechanical Properties of Multi-Sized Porous Thermal Barrier Coatings at Micro and Nano Scales after Long-Term Service at High Temperature

et al. 2022

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Atmospheric plasma-sprayed multi-sized porous structures in thermal barrier coatings (TBCs) were constructed with hollow spherical (HOSP) 8YSZ powders and polypropylene pore formers. The mechanical properties of the multi-sized TBCs were investigated through the nanoindentation method as comparations of the as-sprayed coating and those serving at 1100 °C for a long-term. The results showed that the introduction of the multi-sized pores into TBCs could lead to the decrease of the hardness and modulus as well as the increase of fracture toughness. The hardness and modulus of the coating increased, and the fracture toughness of the coating decreased with the prolongation of the serving times at high temperatures. The mechanical properties of the coating became stable after 60 days’ serving at 1100 °C. The hardness, elastic modulus and fracture toughness of the TBCs increased to 6.51, 7.79, 10.04 GPa and 126.36, 135.13, 145.22 GPa as well as 1.049, 1.157, 1.255 MPa·m0.5, respectively, corresponding to the multi-sized porous TBCs with 0%, 10% and 15% PP powders. The nano-size pores disappeared gradually in the multi-sized TBCs during serving at 1100 °C. The macropores deposited between the ceramic particles penetrated with little diffusion and were not easy to disappear. The introduction of a multi-scale pore structure into the TBCs could improve the stress-strain tolerance of the TBCs.

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“…The crack length could be measured. Formula (1) reflects the relationship of fracture toughness and crack length according to the Nihhara relation [41]:…”

Section: Propertiesmentioning

confidence: 99%

Mechanical Properties of Multi-Sized Porous Thermal Barrier Coatings at Micro and Nano Scales after Long-Term Service at High Temperature

et al. 2022

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“…e elastic modulus and maximum depth of the indentation of the base material are selected as the fundamental quantity. Π theorem is applied to nondimensionalize equations (12) and (13), and the following equations can be obtained:…”

Section: Substrate Effect In Indentation Of In Coating and Dimensionlmentioning

confidence: 99%

“…In the numerical simulation of this study, fixed maximum depth of the indentation (equal to that in the indentation test) is taken, and equations (12) and (13) can be expressed as…”

Section: Substrate Effect In Indentation Of In Coating and Dimensionlmentioning

confidence: 99%

“…For example, the American Society for Testing and Materials (ASTM) gave a standard test method [11] for the mechanical properties of coating materials, and the premise of the test is to assume that the properties of the coating are isotropic and linear. Several recent studies [12][13][14][15] on the mechanical properties of hard coatings have also equated coatings with isotropic materials. However, the microstructure feature of the hard coating resulting from the special preparation process (such as the layered structure prepared by air plasma spraying [16] and the columnar structure prepared by physical vapor deposition [17]) makes the elastic modulus of the hard coating show a significant difference in horizontal and vertical directions in the coating surface [16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Identification of the Anisotropic Elastic Parameters of NiCrAlY Coating by Combining Nanoindentation and Finite Element Method

Zhai

Chen

Xin-yuan

et al. 2019

Shock and Vibration

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For vibration damping, coatings are prepared on surface of the structures (substrates), which constitute the coating-substrate composite structures. Elastic parameters of the coating are indispensable for the vibration and damping analysis of the composite structure. Due to the small scale of coating thickness and elastic difference compared with the substrate, the identification results are inevitably influenced by the existence of substrate. Moreover, resulting from the preparation process, elastic properties of hard coating often exhibit anisotropic properties. All the above factors bring about the difficulties of accurate identification. In this study, a method for identifying anisotropic elastic parameters of hard coatings considering substrate effect is proposed, by combining nanoindentation and finite element analysis. Based on the identification results, finite element models are established to analyze the vibration characteristics of the coating-substrate composite structure, which verify the rationality of the anisotropic elastic parameters for vibration analysis. The studies in this paper are significant to more accurately identify the mechanical parameters for establishing the dynamic model. Moreover, they lay the foundation for further optimization design of hard coating damping.

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“…3) It is to utilize the indentation method directly to evaluate HT modulus of coatings at temperatures below 1000 ℃ [16][17][18]. However, the drawback stems from the oxidation, erosion, and stiffness degradation of the indenter at HT that affect deeply the measurements [19,20].…”

Section: Introductionmentioning

confidence: 99%

Evaluating high temperature elastic modulus of ceramic coatings by relative method

et al. 2017

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Abstract:The accurate evaluation of the elastic modulus of ceramic coatings at high temperature (HT) is of high significance for industrial application, yet it is not easy to get the practical modulus at HT due to the difficulty of the deformation measurement and coating separation from the composite samples. This work presented a simple approach in which relative method was used twice to solve this problem indirectly. Given a single-face or double-face coated beam sample, the relative method was firstly used to determine the real mid-span deflection of the three-point bending piece at HT, and secondly to derive the analytical relation among the HT moduli of the coating, the coated and uncoated samples. Thus the HT modulus of the coatings on beam samples is determined uniquely via the measured HT moduli of the samples with and without coatings. For a ring sample (from tube with outer-side, inner-side, and double-side coating), the relative method was used firstly to determine the real compression deformation of a split ring sample at HT, secondly to derive the relationship among the slope of load-deformation curve of the coated ring, the HT modulus of the coating and substrate. Thus, the HT modulus of ceramic coatings can be evaluated by the substrate modulus and the load-deformation data of coated rings. Mathematic expressions of those calculations were derived for the beam and ring samples. CVD-SiC coatings on graphite substrate were selected as the testing samples, of which the measured modulus ranging from room temperature to 2100 ℃ demonstrated the validity and convenience of the relative method.

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Determination of high temperature mechanical properties of thermal barrier coatings by nanoindentation

Cited by 33 publications

References 20 publications

Mechanical Properties of Multi-Sized Porous Thermal Barrier Coatings at Micro and Nano Scales after Long-Term Service at High Temperature

Mechanical Properties of Multi-Sized Porous Thermal Barrier Coatings at Micro and Nano Scales after Long-Term Service at High Temperature

Identification of the Anisotropic Elastic Parameters of NiCrAlY Coating by Combining Nanoindentation and Finite Element Method

Evaluating high temperature elastic modulus of ceramic coatings by relative method

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