{"title":"Influence of Na2SO4 molten salts on the self-healing behavior of Ni/Al2O3 composites","authors":"D. Maruoka, K. Harada, T. Murakami, E. Kasai","doi":"10.1080/21870764.2023.2251248","DOIUrl":null,"url":null,"abstract":"ABSTRACT The objective of this study is to investigate the influence of Na2SO4 molten salt on the self-healing behavior of Ni/Al2O3 for its utilization as the middle pressure ceramic turbine blades of aircraft. Dense 5 vol% Ni/Al2O3 was prepared and cracks were introduced by the Vickers indentations. The samples were heat-treated ranging from 1000°C to 1150°C for 0.5 h to 48 h in air with Na2SO4 molten salt. The crack lengths of samples before/after the heat treatment were measured using scanning electron microscope (SEM) and the crack disappearance rate was calculated. X-ray diffraction (XRD) results show same peaks in the samples heat-treated with and without Na2SO4 molten salt. The crack disappearance rate of sample heat-treated with Na2SO4 molten salt is higher than that without molten salt and increases according to the parabolic manner. The apparent activation energies for crack disappearance are 354 kJ/mol for the sample heat-treated with Na2SO4 molten salt and 390 kJ/mol for that without Na2SO4 molten salt. The bending strength of the sample heat-treated with Na2SO4 molten salt is equivalent to that of the original sample. Ni/Al2O3 composite exhibits excellent corrosion resistance and self-healing function even in coexistence with Na2SO4 molten salt.","PeriodicalId":15130,"journal":{"name":"Journal of Asian Ceramic Societies","volume":null,"pages":null},"PeriodicalIF":2.2000,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Asian Ceramic Societies","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1080/21870764.2023.2251248","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, CERAMICS","Score":null,"Total":0}
引用次数: 0
Abstract
ABSTRACT The objective of this study is to investigate the influence of Na2SO4 molten salt on the self-healing behavior of Ni/Al2O3 for its utilization as the middle pressure ceramic turbine blades of aircraft. Dense 5 vol% Ni/Al2O3 was prepared and cracks were introduced by the Vickers indentations. The samples were heat-treated ranging from 1000°C to 1150°C for 0.5 h to 48 h in air with Na2SO4 molten salt. The crack lengths of samples before/after the heat treatment were measured using scanning electron microscope (SEM) and the crack disappearance rate was calculated. X-ray diffraction (XRD) results show same peaks in the samples heat-treated with and without Na2SO4 molten salt. The crack disappearance rate of sample heat-treated with Na2SO4 molten salt is higher than that without molten salt and increases according to the parabolic manner. The apparent activation energies for crack disappearance are 354 kJ/mol for the sample heat-treated with Na2SO4 molten salt and 390 kJ/mol for that without Na2SO4 molten salt. The bending strength of the sample heat-treated with Na2SO4 molten salt is equivalent to that of the original sample. Ni/Al2O3 composite exhibits excellent corrosion resistance and self-healing function even in coexistence with Na2SO4 molten salt.
期刊介绍:
The Journal of Asian Ceramic Societies is an open access journal publishing papers documenting original research and reviews covering all aspects of science and technology of Ceramics, Glasses, Composites, and related materials. These papers include experimental and theoretical aspects emphasizing basic science, processing, microstructure, characteristics, and functionality of ceramic materials. The journal publishes high quality full papers, letters for rapid publication, and in-depth review articles. All papers are subjected to a fair peer-review process.