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首页> 外文期刊>Materials Science and Engineering >Quantification of void network architectures of suspension plasma-sprayed (SPS) yttria-stabilized zirconia (YSZ) coatings using Ultra-small-angle X-ray scattering (USAXS)
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Quantification of void network architectures of suspension plasma-sprayed (SPS) yttria-stabilized zirconia (YSZ) coatings using Ultra-small-angle X-ray scattering (USAXS)

机译：使用超小角度X射线散射（USAXS）定量分析悬浮等离子喷涂（SPS）氧化钇稳定的氧化锆（YSZ）涂层的空隙网络架构

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摘要

Suspension plasma spraying (SPS) is able to process a stabilized suspension of nanometer-sized feedstock particles to form thin (from 20 to 100 μm) coatings with unique microstructures. The void (pore) network structure of these ceramic coatings is challenging to characterize and quantify using commonly used techniques due to small sizes involved. Nevertheless, the discrimination of these pores in terms of their size and shape distribution, anisotropy, specific surface area, etc., is critical for the understanding of processing, microstructure, and properties relationships. We will show that one of suitable combinations of techniques providing sufficient detail is ultra-small-angle X-ray scattering (USAXS) and helium pycnometry, combined with scanning electron microscopy (SEM). Yttria-partially stabilized zirconia (YSZ) coatings were manufactured by plasma processing of suspension of particles with average diameter of ～50 nm. Several sets of spray parameters (plasma gas mixture, spray distance, electric arc intensity, etc.) were used to generate plasma jets with different mass enthalpies and coefficients of thermal transfer and different heat fluxes transferred to the substrate. Free-standing coatings were studied as-sprayed and annealed at 800 and 1100 ℃ for 10 and 100 h (non-constrained sintering). Results indicate that the SPS coatings exhibit nanosized pore microstructure: average void size was about the same size scale as the feedstock size; i.e., nanometer sizes with multimodal void size distribution. About 80% of the pores (by number) exhibited characteristic dimensions smaller than 30 nm. Total void content of as-sprayed SPS coatings varies between 13% and 20%. Most of the voids were found to be opened with only between one-tenth to one-third of voids volume being inaccessible by intrusion (not connected to either surface). During annealing, even at temperatures as low than 800℃, the microstructure transformed: while the total void content did not change significantly, the void size distribution evolved toward larger sizes. This unique void system, together with the nanometer scale of the particulate matrix itself, gave these coatings very low apparent thermal conductivity (in the order of 0.1 W m~(-1) K~(-1)), as rarefaction effect and phonon scattering mechanisms are very likely emphasized.
机译：悬浮等离子喷涂（SPS）能够处理稳定的纳米级原料颗粒悬浮液，以形成具有独特微观结构的薄涂层（20至100μm）。由于涉及的尺寸小，这些陶瓷涂层的空隙（孔）网络结构难以通过常用技术表征和量化。然而，对于这些孔的大小和形状分布，各向异性，比表面积等的区分对于理解加工，微观结构和性能关系至关重要。我们将显示提供足够详细信息的技术的合适组合之一是超小角度X射线散射（USAXS）和比重瓶比重瓶，结合扫描电子显微镜（SEM）。氧化钇部分稳定的氧化锆（YSZ）涂层是通过对直径约50 nm的颗粒悬浮液进行等离子体处理而制成的。使用几组喷雾参数（等离子气体混合物，喷雾距离，电弧强度等）来生成具有不同质量焓和热传递系数以及传递给基材的热通量不同的等离子体射流。研究了独立涂层的喷涂情况，并在800和1100℃下退火10和100 h（无约束烧结）。结果表明，SPS涂层表现出纳米级的孔微结构：平均空隙尺寸与原料尺寸大致相同；即具有多峰空隙尺寸分布的纳米尺寸。约80％的孔（数量）显示出小于30 nm的特征尺寸。喷涂后的SPS涂层的总空隙含量在13％和20％之间变化。发现大多数空隙是开放的，只有十分之一到三分之一的空隙无法通过侵入（未连接到任一表面）进入。在退火过程中，即使在低于800℃的温度下，组织也发生了转变：虽然总空隙含量没有显着变化，但空隙尺寸分布却朝着较大尺寸发展。这种独特的孔隙系统，加上颗粒基质本身的纳米级尺寸，使这些涂层的表观热导率非常低（约为0.1 W m〜（-1）K〜（-1）），具有稀疏效应和声子。散射机制很可能得到强调。

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  • 来源
    《Materials Science and Engineering》 |2010年第1期|p.91-102|共12页
  • 作者

    Antoine Bacciochini; Jan Ilavsky; Ghislain Montavon; Alain Denoirjean; Fadhel Ben-ettouil; Stephane Valette; Pierre Fauchais; Karine Wittmann-teneze;

  • 作者单位

    SPCTS, UMR CNRS no. 6638, Faculte des Sciences et Techniques, Universite de Limoges, 123 avenue Albert Thomas, 87060 Limoges Cedex, France;

    Advanced Photon Source, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439, USA;

    SPCTS, UMR CNRS no. 6638, Faculte des Sciences et Techniques, Universite de Limoges, 123 avenue Albert Thomas, 87060 Limoges Cedex, France,LERMPS - EA3316, Universite de Tech- nologie de Belfort-Montbeliard, site de Sevenans, 90010 Belfort Cedex, France;

    SPCTS, UMR CNRS no. 6638, Faculte des Sciences et Techniques, Universite de Limoges, 123 avenue Albert Thomas, 87060 Limoges Cedex, France;

    SPCTS, UMR CNRS no. 6638, Faculte des Sciences et Techniques, Universite de Limoges, 123 avenue Albert Thomas, 87060 Limoges Cedex, France;

    SPCTS, UMR CNRS no. 6638, Faculte des Sciences et Techniques, Universite de Limoges, 123 avenue Albert Thomas, 87060 Limoges Cedex, France;

    SPCTS, UMR CNRS no. 6638, Faculte des Sciences et Techniques, Universite de Limoges, 123 avenue Albert Thomas, 87060 Limoges Cedex, France;

    Commissariat à l'Energie Atomique (French Atomic Agency), Centre du Ripautt BP 16, 37000 Monts Cedex, France;

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  • 正文语种 eng
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  • 关键词

    ultra-small-angle X-ray scattering (USAXS); ceramic coating; suspension plasma spraying; porous architecture; thermomechanical properties;

    机译：超小角度X射线散射（USAXS）;陶瓷涂层;悬浮等离子喷涂;多孔结构;热力学性质;

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