Evaluating thermal expansion coefficient and density of ceramic coatings by relative method

Wei, Chenguang; Liu, Zhengquan; Bao, Yiwang; Wan, Detian; Qiu, Yan; Liu, Xiaogen

doi:10.1016/j.matlet.2015.09.034

Cited by 13 publications

(10 citation statements)

References 5 publications

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“…For other configurations in Figure 5A,C, similar equations can be obtained. To demonstrate it, Wei et al 70 used graphite bar as substrate and coated it with four-face chemical vapor Then the CTE of SiC coating was calculated according to Equation ( 6) with an average value of 4.805 × 10 −6 / • C in 1000 • C, which is consistent with reported values. This relative method has several advantages: utilizing conventional equipment for bulk materials, no need to detach film from the substrate, easy handling, and simple calculation…”

Section: Coefficient Of Thermal Expansionsupporting

confidence: 74%

“…Wei et al proposed a relative method to evaluate the CTE of coatings. 70 Samples used in this method could be rectangular bars or cylinders, which are regular shapes for conventional CTE measurement for bulk materials. Symmetric coatings, two-face or four-face on rectangular bars and cylindrical coating, are deposited on these bulk samples, as shown in Figure 5.…”

Section: Coefficient Of Thermal Expansionmentioning

confidence: 99%

See 1 more Smart Citation

Evaluation of environmental barrier coatings: A review

Xiao

Li²,

Huang

et al. 2023

Int J Applied Ceramic Tech

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Environmental barrier coatings (EBCs) greatly improve the service performance of SiC‐based ceramic matrix composites (CMCs) in high‐temperature combustion chambers. Working environments with physical ablation, high temperature, and chemical corrosion require the performance of designed EBC materials and/or structures to be properly evaluated before their real applications. In this paper, EBCs’ lifetime‐related phase stability, chemical compatibility, and microstructure retainability are discussed. And then, evaluation methods for basic and environmental properties of EBCs are thoroughly reviewed with newly proposed methods and improved techniques. Pros and cons of each method along with some potential strategies/techniques are also provided. We hope this article can give a timely and overall review for efficient and effective evaluation of EBCs and provide guidance not only for beginners but also for seasoned researchers when they design and develop high‐performance EBC systems.

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Section: Coefficient Of Thermal Expansionsupporting

confidence: 74%

Section: Coefficient Of Thermal Expansionmentioning

confidence: 99%

Evaluation of environmental barrier coatings: A review

Xiao

Li²,

Huang

et al. 2023

Int J Applied Ceramic Tech

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“…11(a), the microcracks were observed on the coating surface. According to the research results of Wei et al [34], the thermal expansion coefficient of SiC coating was greater than that of graphite substrate. So the coating was under compressive stress caused by the thermal mismatch during the heating process and the closure of microcracks may occur.…”

Section: Ht Elastic Modulus Of Sic Coatings Evaluated By the Relatimentioning

confidence: 95%

“…The relative method is a kind of technical consideration of an indirect test, in which the less measurable parameters can be determined from the directly testable parameters [32][33][34]. The bending method and split ring method are usually used to measure the modulus of monolithic beams and ceramic tubes at room temperature, respectively [35][36][37][38].…”

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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“…[6][7][8][9] Hence, the toughening agent at the designated area is enriched. [10][11][12][13] When toughening materials are added, the weight of the CFRP increases, and its in-plane mechanical properties decrease. [14][15][16][17][18][19] Therefore, numerous studies have been performed globally to obtain suitable toughening materials and structures.…”

Section: Introductionmentioning

confidence: 99%

Microstructure, hygrothermal, and mechanical properties of interlaminar toughening of CFRP composite using polyamide veil

Zheng

Yao

Zhou

et al. 2020

High Performance Polymers

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The addition of polyamide veil (PAV) to the interlaminar area of carbon fiber (CF) fabric/epoxy composites can effectively increase their toughness with high accuracy. Vacuum-assisted resin infusion (VARI) was used to fabricate composite structures. VARI was applied to obtain a PAV, which is an interleaf between fabric piles of CFs. The thermoplastic PAV was dissolved in epoxy when the PAV was cured at high temperature. A phase-separated morphology with a PAV-rich secondary phase was formed during the curing process. Experimental results indicated that compression after impact (CAI), which is the average value of CAI, increased by threefold when two layers of PAV were added. The thermal and mechanical characteristics of the composite were analyzed and compared at room temperature and high-temperature wet conditions.

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Evaluating thermal expansion coefficient and density of ceramic coatings by relative method

Cited by 13 publications

References 5 publications

Evaluation of environmental barrier coatings: A review

Evaluation of environmental barrier coatings: A review

Evaluating high temperature elastic modulus of ceramic coatings by relative method

Microstructure, hygrothermal, and mechanical properties of interlaminar toughening of CFRP composite using polyamide veil

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