Electron-Beam and Plasma Oxidation-Resistant and Thermal-Barrier Coatings Deposited on Turbine Blades Using Cast and Powder Ni(Co)CrAlY(Si) Alloys Produced by Electron Beam Melting IV. Chemical and Phase Composition and Structure of Cocralysi Powder Alloys and Their Use

IF 0.9 4区材料科学 Q3 MATERIALS SCIENCE, CERAMICS

Powder Metallurgy and Metal Ceramics Pub Date : 2023-02-02 DOI:10.1007/s11106-023-00333-0

I. M. Grechanyuk, M. I. Grechanyuk, G. A. Bagliuk, V. G. Grechanyuk, O. V. Khomenko, O. V. Dudnik, V. I. Gots

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Abstract

A new technique for producing powders from the electron-beam CoCrAlYSi alloy (MZP-11 grade) is proposed. The method includes step-by-step grinding of the alloy employing a press and a two-roll vertical mill. The energy consumed to produce these powders is almost one-seventh the energy consumed in conventional methods (crushers, mills) and within one-twentieth that in spraying methods. The chemical and phase composition and structure of the CoCrAlYSi powders were studied. The proposed grinding method allowed the production of powders that corresponded to the starting alloy in terms of chemical composition and structure. The powder particles had polyhedral shape, being close to round, were quite uniform in size, and almost completely preserved the microstructure of the starting CoCrAlYSi alloy. Grinding the alloy led to a slight increase in the content of some impurities in the 40–100 μm powders; in particular, the amount of oxygen increased from 0.05 to 0.08–0.09 wt.% and that of carbon from 0.06 to 0.08–0.1 wt.%. According to the chemical composition and technical characteristics, the powders comply with technical specifications for plasma deposition of two-layer thermal-barrier metal/ceramic coatings. The outer ceramic topcoat is formed with the participation of yttria-stabilized zirconia of at least 99.5 wt.% purity. The coating thickness is controlled by technical documents and is 135–225 μm for the metal layer and 80–120 μm for the ceramic layer. The developed metal powders are used to deposit thermal-barrier coatings on various types of gas turbine blades. The structure and composition of a two-layer thermal-barrier coating produced by plasma spraying of the CoCrAlYSi alloy and ZrO₂– Y₂O₃ ceramic powders were studied.

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利用电子束熔炼法生产的铸造和粉末 Ni(Co)CrAlY(Si)合金在涡轮叶片上沉积的电子束和等离子抗氧化及隔热涂层 IV.Cocralysi 粉末合金的化学和相组成及结构及其用途

提出了一种利用电子束 CoCrAlYSi 合金（MZP-11 级）生产粉末的新技术。该方法包括使用压机和双辊立磨对合金进行逐步研磨。生产这些粉末所消耗的能量几乎是传统方法（破碎机、碾磨机）的七分之一，是喷涂方法的二十分之一。对 CoCrAlYSi 粉末的化学成分、相组成和结构进行了研究。所建议的研磨方法可以生产出在化学成分和结构方面与初始合金一致的粉末。粉末颗粒呈多面体形状，接近圆形，大小相当均匀，几乎完全保留了初始 CoCrAlYSi 合金的微观结构。对合金进行研磨后，40-100 μm 的粉末中某些杂质的含量略有增加，特别是氧的含量从 0.05 wt.% 增加到 0.08-0.09 wt.%，碳的含量从 0.06 wt.% 增加到 0.08-0.1 wt.%。根据化学成分和技术特性，这些粉末符合双层隔热金属/陶瓷涂层的等离子沉积技术规范。外层陶瓷表层由纯度至少为 99.5%的钇稳定氧化锆参与形成。涂层厚度由技术文件控制，金属层为 135-225 μm，陶瓷层为 80-120 μm。开发的金属粉末用于在各种类型的燃气轮机叶片上沉积隔热涂层。研究了等离子喷涂 CoCrAlYSi 合金和 ZrO2- Y2O3 陶瓷粉末产生的双层隔热涂层的结构和成分。

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来源期刊

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

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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