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首页> 美国卫生研究院文献>Materials >A Study on the Microstructural Characterization and Phase Compositions of Thermally Sprayed Al2O3-TiO2 Coatings Obtained from Powders and Water-Based Suspensions
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A Study on the Microstructural Characterization and Phase Compositions of Thermally Sprayed Al2O3-TiO2 Coatings Obtained from Powders and Water-Based Suspensions

机译：粉末和水悬浮液获得的热喷涂Al2O3-TiO2涂层的微观结构表征和相组成的研究

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摘要

In this work, the alumina (Al O ) and alumina-titania coatings with different contents of TiO , i.e., Al O + 13 wt.% TiO and Al O + 40 wt.% TiO , were studied. The coatings were produced by means of powder and liquid feedstock thermal spray processes, namely atmospheric plasma spraying (APS), suspension plasma spraying (SPS) and suspension high-velocity oxygen fuel spraying (S-HVOF). The aim of the study was to investigate the influence of spray feedstocks characteristics and spray processes on the coating morphology, microstructure and phase composition. The results revealed that the microstructural features were clearly related both to the spray processes and chemical composition of feedstocks. In terms of phase composition, in Al O (AT0) and Al O + 13 wt.% TiO (AT13) coatings, the decrease in α-Al O , which partially transformed into γ-Al O , was the dominant change. The increased content of TiO to 40 wt.% (AT40) involved also an increase in phases related to the binary system Al O -TiO (Al TiO and Al Ti O ). The obtained results confirmed that desired α-Al O or α-Al O , together with rutile-TiO phases, may be preserved more easily in alumina-titania coatings sprayed by liquid feedstocks.
机译：在这项工作中，研究了具有不同TiO含量的氧化铝（Al O）和氧化铝-二氧化钛涂层，即Al O + 13 wt。％TiO和Al O + 40 wt。％TiO。该涂料是通过粉末和液体原料热喷涂工艺生产的，即大气等离子喷涂（APS），悬浮等离子喷涂（SPS）和悬浮高速氧气燃料喷涂（S-HVOF）。该研究的目的是研究喷涂原料的特性和喷涂工艺对涂层形态，微观结构和相组成的影响。结果表明，微观结构特征与喷涂工艺和原料的化学组成均明显相关。在相组成方面，在Al O（AT0）和Al O + 13 wt。％TiO（AT13）涂层中，α-AlO的减少（部分转变为γ-AlO）是主要变化。 TiO含量增加到40 wt。％（AT40）还涉及与二元体系Al O -TiO（Al TiO和Al Ti O）有关的相的增加。获得的结果证实，在用液体原料喷涂的氧化铝-二氧化钛涂层中，所需的α-AlO或α-AlO以及金红石型TiO相可以更容易地保存。

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