{"title":"Microstructural Evolution and Tribological Performance of Functionally Graded Al-µB4C/BNNP Coatings Produced via Cold Spray","authors":"Achyuth Kulkarni, Michael Krenn, Troy Y. Ansell","doi":"10.1007/s11666-025-01985-7","DOIUrl":null,"url":null,"abstract":"<div><p>This study investigates the microstructural and mechanical properties of cold-sprayed AA7075 coatings reinforced with varying compositions of micro-boron carbide (µB<sub>4</sub>C) and boron nitride nanoplatelets (BNNPs). Functionally graded coatings (FGCs) with different ceramic content (10-30 vol.% µB<sub>4</sub>C) were produced and analyzed for surface roughness, microstructure, hardness, and wear resistance. The inclusion of BNNPs improved particle distribution and reduced clustering in dual-reinforced compositions. Nanoindentation and wear tests show that coatings with higher µB<sub>4</sub>C content exhibited increased hardness and reduced wear rates, with a maximum hardness of 7.2 GPa for Al-30%µB<sub>4</sub>C. The wear resistance improved up to 46.5% compared to unreinforced AA7075, with µB<sub>4</sub>C particles enhancing load transfer and minimizing frictional forces.</p></div>","PeriodicalId":679,"journal":{"name":"Journal of Thermal Spray Technology","volume":"34 5","pages":"1736 - 1746"},"PeriodicalIF":3.3000,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Thermal Spray Technology","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1007/s11666-025-01985-7","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, COATINGS & FILMS","Score":null,"Total":0}
引用次数: 0
Abstract
This study investigates the microstructural and mechanical properties of cold-sprayed AA7075 coatings reinforced with varying compositions of micro-boron carbide (µB4C) and boron nitride nanoplatelets (BNNPs). Functionally graded coatings (FGCs) with different ceramic content (10-30 vol.% µB4C) were produced and analyzed for surface roughness, microstructure, hardness, and wear resistance. The inclusion of BNNPs improved particle distribution and reduced clustering in dual-reinforced compositions. Nanoindentation and wear tests show that coatings with higher µB4C content exhibited increased hardness and reduced wear rates, with a maximum hardness of 7.2 GPa for Al-30%µB4C. The wear resistance improved up to 46.5% compared to unreinforced AA7075, with µB4C particles enhancing load transfer and minimizing frictional forces.
期刊介绍：
From the scientific to the practical, stay on top of advances in this fast-growing coating technology with ASM International''s Journal of Thermal Spray Technology. Critically reviewed scientific papers and engineering articles combine the best of new research with the latest applications and problem solving.
A service of the ASM Thermal Spray Society (TSS), the Journal of Thermal Spray Technology covers all fundamental and practical aspects of thermal spray science, including processes, feedstock manufacture, and testing and characterization.
The journal contains worldwide coverage of the latest research, products, equipment and process developments, and includes technical note case studies from real-time applications and in-depth topical reviews.
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