还原氧化石墨烯（rGO）混合HVOF喷涂纳米结构涂层的特性

IF 2.4 4区材料科学 Q3 MATERIALS SCIENCE, COATINGS & FILMS

Surface Engineering Pub Date : 2023-04-03 DOI:10.1080/02670844.2023.2232967

A. Srikanth, V. Bolleddu

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引用次数: 1

摘要

与空气等离子喷涂陶瓷涂层相比，高速氧燃料喷涂陶瓷涂层具有更小的孔隙率和优异的粘结强度。特别地，HVOF喷涂的碳化钨-钴（WC-Co）涂层具有意想不到的脆性断裂的缺点。这些涂层通常在较高的应力水平下失效，因为它们的断裂韧性较低，这是由于在涂层沉积过程中发生脱碳而导致的。在本工作中，研究了在添加和不添加rGO的情况下HVOF喷涂的WC-25wt-%Co纳米结构涂层。在添加1.5%rGO的WC-25wt-%Co涂层的微观结构中发现，rGO已从基体中拉出并包裹在断裂区域中。还观察到，随着rGO添加百分比的增加，WC-25wt-%Co涂层中的孔隙率由于孔隙数量的减少而减少。

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Characteristics of reduced graphene oxide (rGO) mixed HVOF-sprayed nanostructured coatings

ABSTRACT High-velocity oxyfuel (HVOF) sprayed ceramic coatings possess less porosity and exceptional cohesive strength as compared to the air plasma sprayed ceramic coatings. In particular, the HVOF-sprayed tungsten carbide-cobalt (WC-Co) coatings have the disadvantage of unexpected brittle fracture. These coatings usually fail at higher levels of stress because of their lower fracture toughness that results due to decarburization occurring during the deposition of the coatings. In this work, the HVOF-sprayed nanostructured WC-25wt-%Co coatings have been investigated with and without the addition of rGO. It was found in the microstructure of 1.5% rGO-added WC-25wt-%Co coatings that the rGO has been pulled out from the matrix and wrapped in the fractured regions. It was also observed with an increasing percentage of rGO addition that the porosity in the WC-25wt-%Co coatings has been reduced due to a reduction in the number of pores.

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来源期刊

Surface Engineering 工程技术-材料科学：膜

CiteScore

5.60

自引率

14.30%

发文量

审稿时长

2.3 months

期刊介绍： Surface Engineering provides a forum for the publication of refereed material on both the theory and practice of this important enabling technology, embracing science, technology and engineering. Coverage includes design, surface modification technologies and process control, and the characterisation and properties of the final system or component, including quality control and non-destructive examination.