Synthesis of Lanthanum Pyrochlore–Lanthanum Phosphate Composite Powders for Thermal Barrier Coating Applications

IF 0.9 4区 材料科学 Q3 MATERIALS SCIENCE, CERAMICS Powder Metallurgy and Metal Ceramics Pub Date : 2024-08-13 DOI:10.1007/s11106-024-00429-1
K. Karthikeyan, S. Manisha Vidyavathy
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Abstract

Thermal barrier coatings (TBCs) play a critical role in protecting metallic substrates from high-temperature degradation in aerospace and industrial applications. This study was undertaken to synthesize and evaluate a novel lanthanum phosphate zirconate (LaPZ) composite as a potential candidate for TBCs. The LaPZ composite was synthesized by a high-energy ball milling method followed by calcination, which allows precise control over the composition and microstructure. The synthesized LaPZ composite was characterized by various techniques, including X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermal analysis. Lanthanum phosphate was prepared by precipitation method: calcined at 700°C and further calcined at 1,200°C for 2 h. LP-C was used for the preparation of composite powders. It was ball milled at 350 rpm for 8 h, wet milled with distilled water in a high energy planetary mill with zirconia media, and calcined at 1,300°C for 4 h. X-ray diffraction analysis at 1,300°C revealed LaPZ composite powders with a cubic pyrochlore structure of La2Zr2O7 and monoclinic LaPO4. To obtain the pyrochlore structure, LaP and zirconia were taken in two different molar ratios, namely 1 : 1 (LaPZ 1) and 1 : 2 (LaPZ 2). The coefficient of thermal expansion (CTE) of the LaPZ 1 coating was approximately 8.97 · 10–6 K–1. The LAPZ 2 coating exhibited a CTE of 9.15 · 10–6 K–1 when exposed to temperatures ranging from 0 to 1,400°C. Samples maintained stable thermal expansion up to 1,400°C, indicating the suitability of LaPZ for TBC applications.

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合成热障涂层应用中的镧系吡咯洛尔-磷酸镧复合粉末
在航空航天和工业应用中,热障涂层(TBC)在保护金属基底免受高温降解方面发挥着至关重要的作用。本研究旨在合成和评估一种新型磷酸锆酸镧(LaPZ)复合材料,将其作为热障涂层的潜在候选材料。LaPZ 复合材料是通过高能球磨法合成的,然后进行煅烧,从而实现了对成分和微观结构的精确控制。合成的 LaPZ 复合材料通过各种技术进行了表征,包括 X 射线衍射 (XRD)、扫描电子显微镜 (SEM) 和热分析。磷酸镧采用沉淀法制备:在 700°C 煅烧,然后在 1,200°C 煅烧 2 小时。在 1,300°C 下进行的 X 射线衍射分析表明,LaPZ 复合粉末具有 La2Zr2O7 立方热核结构和 LaPO4 单斜结构。为了获得这种热长石结构,LaP 和氧化锆采用了两种不同的摩尔比,即 1 : 1(LaPZ 1)和 1 : 2(LaPZ 2)。LaPZ 1 涂层的热膨胀系数(CTE)约为 8.97 - 10-6 K-1。在 0 至 1,400°C 的温度范围内,LAPZ 2 涂层的热膨胀系数为 9.15 - 10-6 K-1。样品在 1,400°C 时仍能保持稳定的热膨胀,这表明 LaPZ 适用于 TBC 应用。
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来源期刊
Powder Metallurgy and Metal Ceramics
Powder Metallurgy and Metal Ceramics 工程技术-材料科学:硅酸盐
CiteScore
1.90
自引率
20.00%
发文量
43
审稿时长
6-12 weeks
期刊介绍: Powder Metallurgy and Metal Ceramics covers topics of the theory, manufacturing technology, and properties of powder; technology of forming processes; the technology of sintering, heat treatment, and thermo-chemical treatment; properties of sintered materials; and testing methods.
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