Ceramics International最新文献

{"title":"Unveiling the importance of controllable growth of c-axis oriented Sn-doped ZnO nanorod arrays: Towards humidity sensing applications","authors":"A.S. Ismail ,&nbsp;M.H. Mamat ,&nbsp;R. Mohamed ,&nbsp;Z. Embong ,&nbsp;S. Kossar","doi":"10.1016/j.ceramint.2024.11.424","DOIUrl":"10.1016/j.ceramint.2024.11.424","url":null,"abstract":"<div><div>In this study, tin (Sn)-doped zinc oxide (ZnO) nanorod arrays (SZO) were prepared using a sonication assisted sol-gel immersion method, with the growth of the nanorod arrays controlled by varying the immersion time in the precursor material. Morphology images taken using a Field Emission Scanning Electron Microscope (FESEM) demonstrated an enlargement of the average diameter of the nanorod arrays from 55 nm at 5 min immersion to 122 nm at 200 min immersion. The cross-sectional and surface elemental analysis showed that the sample immersed for 60 min has the highest detection of Sn, with a bulk concentration of 1.8 at.% and surface concentration of 1 at.%. Interestingly, we noticed that Sn is not exist on the surface of 200 min immersion, indicating the depletion of the Sn precursor due to the prolongation of the immersion time. From the current voltage (I-V) analysis, 60 min immersion sample generated the lowest thin film resistivity, which engendered the best humidity sensitivity of 4.05. This study demonstrated the significant importance of optimizing the immersion or growth time for doped 1-D nanostructures to obtain the best humidity sensing performance.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 4","pages":"Pages 4487-4499"},"PeriodicalIF":5.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143235092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The impact of high-temperature annealing on magnetic properties, structure and martensitic transformation of Ni₂MnGa-based glass-coated microwires","authors":"Mohamed Salaheldeen ,&nbsp;Valentina Zhukova ,&nbsp;Juan Maria Blanco ,&nbsp;Julian Gonzalez ,&nbsp;Arcady Zhukov","doi":"10.1016/j.ceramint.2024.11.414","DOIUrl":"10.1016/j.ceramint.2024.11.414","url":null,"abstract":"<div><div>In this article we present our experimental results on the effect of high temperature annealing on magnetic and structure performance of NiMnGa-based glass coated microwires. The samples were annealed at 1173 K and 1273 K for 1h. The as-prepared sample exhibits weak ferromagnetic behaviour with magnetic remanence near to zero and average coercivity about 6 Oe. Annealing of NiMnGa microwires leads to increase in coercivity up to 230 Oe for the sample annealed at 1273 K. Additionally, high-temperature annealing induces martensitic transformation (MT). Annealing significantly influences the Curie temperature (T_c) of the samples, bringing it closer to room temperature, thereby making them more suitable for magnetic solid-state refrigeration applications. The observed changes can be attributed to several factors, such as internal stress relaxation, nanocrystalline structure, recrystallization processes, and variations in the magnetic ordering of phases present in the as-prepared and annealed states. While the insulating and flexible glass coating enhances the mechanical properties of the microwires, it is important to acknowledge that it can also significantly affects their magnetic properties. The current results confirm the stability of ferromagnetic and martensitic transformation of nanocrystalline NiMnGa-based glass-coated wires after heat treatment up to 1273 K.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 4","pages":"Pages 4378-4387"},"PeriodicalIF":5.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143235371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing photocatalytic potential of Mg0.5Ti0.5Fe2O4.5 NPs by optimizing the sintering temperature","authors":"Gurpinder Singh ,&nbsp;Ajaypal Kaur ,&nbsp;Manpreet Kaur ,&nbsp;Kiran Jeet ,&nbsp;J. Nagendra Babu","doi":"10.1016/j.ceramint.2024.11.488","DOIUrl":"10.1016/j.ceramint.2024.11.488","url":null,"abstract":"<div><div>Ti⁴⁺substituted magnesium ferrite nanoparticles (Mg_0.5Ti_0.5Fe₂O_4.5) with spinel structure were synthesized using the sol-gel process and sintered at 300, 400 and 500 °C. Mg_0.5Ti_0.5Fe₂O_4.5 nanoparticles were studied using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), Scanning Electron Microscopy (SEM) with X-ray dispersive spectroscopy (EDS), High Resolution Transmission Electron Microscopy (HRTEM) and Selected Area Electron Diffraction (SAED). Surface area of all synthesized nanoparticles was compared using BET method. The effect of sintering temperature on structure and photocatalytic activity was examined using tetracycline hydrochloride as a model pollutant under visible light irradiation. The XRD patterns confirmed the presence of spinel structure in Mg_0.5Ti_0.5Fe₂O_4.5NPs at all heat-treated temperatures and in the pure phase. TEM and SEM-EDX analyses confirmed the porosity and agglomeration in the doped ferrite nanoparticles. Infrared spectra showed absorption bands between 400 and 600 cm⁻¹, confirming the presence of the ferrite phase. Lattice constant and band gap energy were decreased due to substitution of tetravalent Ti⁴⁺ ion. Mg_0.5Ti_0.5Fe₂O_4.5 sintered at 400 °C showed a minimal band gap of 2.10 eV and highest photocatalytic potential. The combination of hydrogen peroxide and ferrites was discovered to have a synergistic effect on the photodegradation of tetracycline hydrochloride. Quenching experiments demonstrated that hydroxyl radicals and holes were dominating in the degradation of tetracycline hydrochloride under visible light. Kinetic studies of photodegradation and quenching tests were carried out using the Langmuir-Hinshelwood model.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 4","pages":"Pages 5135-5147"},"PeriodicalIF":5.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143235428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Embedded ferrihydrite nanoparticles in a SiO2 medium with enhanced superparamagnetic blocking temperature","authors":"Yuriy V. Knyazev ,&nbsp;Viktor L. Kirillov ,&nbsp;Aleksandr A. Krasikov ,&nbsp;Stanislav A. Skorobogatov ,&nbsp;Dmitry A. Velikanov ,&nbsp;Mikhail N. Volochaev ,&nbsp;Ekaterina D. Smorodina ,&nbsp;Oleg A. Bayukov ,&nbsp;Oleg N. Martyanov ,&nbsp;Dmitry A. Balaev","doi":"10.1016/j.ceramint.2024.11.473","DOIUrl":"10.1016/j.ceramint.2024.11.473","url":null,"abstract":"<div><div>The composite material based on the ferrihydrite nanoparticles (5Fe₂O₃ · 9H₂O) encapsulated in SiO₂ matrix was synthesized. Synthesized sample has been characterized by transmission electron microscopy, room-temperature ⁵⁷Fe Mössbauer spectroscopyand X-ray photoelectron spectroscopy. The data obtained have shown (i) the presence of isolated ferrihydrite nanoparticles with an average size of ∼4.3 nm in the SiO₂ matrix and (ii) the complete absence of the nanoparticles binding with the SiO₂ matrix. The temperature dependences of the <em>ac</em> and <em>dc</em> magnetization, as well as the temperature evolution of the Mössbauer spectra point out only the occurrence of the superparamagnetic blocking with decreasing temperature. The analysis of the relaxation time of particle magnetic moments have shown no magnetic interactions in the investigated system. A detailed examination of the magnetization curves has revealed that the non-interacted ferrihydrite nanoparticles formed by two magnetic subsystems: paramagnetic surface spins and the magnetically ordered core. Such magnetic morphology results in the significantly decrease of the anisotropy constant (<em>K</em> = 18 ∙ 10⁵ erg/cm³) compared to interacted nanoparticles. At the same time, a decisive role in the magnetic behavior of the material is played by the subsystem of free spins, which involves about half of all iron atoms on the particle surface.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 4","pages":"Pages 5020-5030"},"PeriodicalIF":5.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143235527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unveiling significant changes in optical, magnetic, and visible-light photocatalytic performance of CuFe₂O₄ nanocompositions through chelating agent modulation","authors":"Mohammed Ahmed Wahba","doi":"10.1016/j.ceramint.2024.11.410","DOIUrl":"10.1016/j.ceramint.2024.11.410","url":null,"abstract":"<div><div>This study presents a comprehensive investigation of copper ferrite (CuFe₂O₄) nanoparticles synthesized using the sol-gel auto-combustion method with three distinct chelating/combustion agents: glycine (GCF), succinic acid (SCF), and tartaric acid (TCF). The choice of chelating agent significantly influenced the structural, morphological, magnetic, and photocatalytic properties of the CuFe₂O₄ nanoparticles. The synthesis of high-crystallinity CuFe₂O₄ was achieved using glycine and succinic acid, resulting in certain impurities, namely Fe₂O₃ and CuO. In contrast, the tartaric acid yielded the purest form of CuFe₂O₄, containing only trace amounts of Fe₂O₃ while exhibiting lower crystallinity. Importantly, both tartaric acid and succinic acid significantly reduced particle size and surface roughness. Variations in the position of IR bands indicated changes in cation distribution within the Oh sites influenced by chelating agents variation. Optically, a significant red shift in the absorption edge was observed with an extended absorption tail into higher wavelengths, likely attributed to morphological variations in the nanocrystals. The GCF sample exhibited a band gap (BG) value of 1.56 eV, while the SCF and TCF samples displayed BG values of 1.64 eV and 1.60 eV, respectively suggesting the suitability of these ferrite powders for solar energy photocatalysis applications. The refractive index (n) values for the GCF, SCF, and TCF samples were recorded to be above 2.5, indicating their high refractive indices. Among the samples, GCF exhibited the highest refractive index value. A significant increase in coercivity was observed when transitioning from tartaric acid (530 Oe) to glycine (931 Oe), while an even more dramatic increase was recorded for the SCF sample, synthesized with succinic acid (1275 Oe). This demonstrates the substantial impact of the chelating agent on the magnetic coercivity of the CuFe₂O4 nanoparticles. The photocatalytic activity of CuFe₂O₄ nanoparticles was preliminary evaluated using the degradation of congo red dye under solar irradiation. GCF exhibited the highest photocatalytic performance (96 %), followed by SCF (92 %) and TCF (39 %). This superior performance can be attributed to the higher crystallinity and presence of free CuO and Fe₂O₃ phases in GCF and SCF, which likely facilitated charge carrier separation and transfer. The degradation process followed a pseudo-first-order reaction, as evidenced by the linear relationship between ln(C_t/C₀) and time.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 4","pages":"Pages 4329-4342"},"PeriodicalIF":5.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143235576","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Phase transformation and structural development in mechano-synthesized calcium-copper-titanate electroceramics","authors":"Morteza Alizadeh ,&nbsp;Hamed Ahmadi Ardakani ,&nbsp;Rasool Amini ,&nbsp;Mohammad Ghaffari ,&nbsp;Shima Pashangeh","doi":"10.1016/j.ceramint.2024.11.446","DOIUrl":"10.1016/j.ceramint.2024.11.446","url":null,"abstract":"<div><div>This research focuses on the mechano-synthesis of synthesizing calcium-copper-titanate (CCTO) powder through mechanical alloying of the respective oxides aiming to optimize the production of nanoscale electroceramics with high dielectric properties. Structural characterization was carried out using X-ray diffraction with Rietveld refinement (phase identification and quantification), while transmission electron microscopy was employed to observe particle size changes including the reduction of particle size to nanometric scales (10–35 nm). The mechano-synthesis process involving CaO, CuO, and TiO₂ resulted in the creation of perovskite CCTO, with minimal contamination observed from the milling process. Significant particle size reduction, nanostructure formation, and a high level of amorphization, alongside polymorphic transitions in TiO₂ during milling that played a critical role in achieving full amorphization, which was essential for the formation of high-purity CCTO. The study demonstrates that after 256 h of milling, 88 wt% of the powder consisted of crystalline CCTO, highlighting the potential for enhanced performance in dielectric and microelectronic applications. There was no detection of either stoichiometric CCTO or any non-stoichiometric phases prior to the complete amorphization of the powders. Therefore, results revealing significant advancements in particle size reduction, nanostructure formation, and amorphization, which influence enhanced material performance. Nucleating and growing the CCTO phase directly from an amorphous state without the formation of intermediate crystalline phases clears the potential for optimizing CCTO production processes.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 4","pages":"Pages 4721-4728"},"PeriodicalIF":5.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143235632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancement of dielectric, magnetic and microwave absorption properties of Co2+- Zr4+ substituted SrFe12O19 nanoparticles","authors":"Altaf Hussain,&nbsp;Iftikhar Hussain Gul,&nbsp;Muhammad Zarrar Khan","doi":"10.1016/j.ceramint.2024.11.451","DOIUrl":"10.1016/j.ceramint.2024.11.451","url":null,"abstract":"<div><div>Co²⁺-Zr⁴⁺ substituted M-type strontium hexagonal ferrite (SrCo_xZr_xFe_12-2xO_19, 0.00 ≤ x ≤ 0.50) nanoparticles were successfully synthesized using sol-gel auto combustion process. The x-ray diffractograms affirmed the development of distinct phase hexagonal ferrite with average crystallite size in the range of 28–35 nm. The fourier transformed infrared spectroscopy identified three distinct modes (between 400 and 650 cm⁻¹), which are consistent with the typical metal-oxygen bonds vibrations at octahedral and tetrahedral sites. All the samples exhibited a homogenous, consistently dispersed spherical shape without agglomeration. The vibrating sample magnetometer analysis revealed an overall increase in the value of saturation magnetization from 40.43 to 50.93 emu/g and remanence from 26.01 to 31.58 emu/g whereas the coercive field decreased from 5790.02 to 4289.89 Oe with increasing Co-Zr concentration. The permittivity and permeability parameters were examined using Agilent network analyzer that disclosed a general increase in both dielectric and magnetic losses with increasing Co-Zr contents <span><math><mrow><mtext>,</mtext></mrow></math></span> indicating enhanced energy dissipation behavior. However, the values of magnetic tangent losses are higher than dielectric tangent losses, revealing magnetic loss nature to be the primary loss mechanism for our synthesized nanoparticles. All the compositions showed reflection loss (R_L) below −10 dB in Ku band (12–18 GHz), representing 90 % absorption of incident microwaves. The highest R_L of value −33.42 dB was observed at 14.28 GHz for x = 0.35, revealing the potential candidacy of our synthesized compositions for microwave absorption applications.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 4","pages":"Pages 4768-4779"},"PeriodicalIF":5.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143235788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Preparation of 99.6 % alumina ceramic substrates with high thermal conductivity by tape casting and warm pressing process","authors":"Wencai Liu ,&nbsp;Yi Shen ,&nbsp;Da Li ,&nbsp;Xueqiong Ouyang ,&nbsp;Qing Liu ,&nbsp;Shuangxi Wang","doi":"10.1016/j.ceramint.2024.11.471","DOIUrl":"10.1016/j.ceramint.2024.11.471","url":null,"abstract":"<div><div>High-purity alumina ceramic substrates have drawn immense attention because of its high strength and hardness, as well as good chemical stability. However, the high sintering temperature and low product yield are significant barriers to the preparation of high-purity alumina ceramic substrates. In this study, modified alumina nanoparticles are used to fabricate high-purity alumina ceramic substrates under pressureless sintering via a tape casting–warm pressing process. The influences of powder modification, forming processes, sintering temperature, and powder particle size on the microstructure, mechanical properties, and thermal properties of the fabricated alumina ceramic substrates are investigated. The experimental results show that tape casting–warm pressing significantly improves the microstructure and density of the green tape and ceramic substrate. As the particle size decreases from 1 μm to 100 nm, the grain arrangement of the ceramic substrate gradually becomes more compact. The smooth ceramic substrate prepared with 100 nm modified powders achieves a relative density of 98.85 % when sintered at 1550 °C, while the average roughness is only 20.0 nm. Especially, the 99.6 % alumina ceramic substrate exhibits excellent physical and mechanical properties, with a thermal conductivity of 37.39 W/(m·K) and fracture toughness of 4.68 MPa m^1/2, making it highly suitable for application in the power integrated-circuit field.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 4","pages":"Pages 5000-5010"},"PeriodicalIF":5.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143236257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Flexible ceramic composites for Magnetic field sensor Applications","authors":"Sajan Masih ,&nbsp;Niyti Sharma ,&nbsp;Sunil Kumar ,&nbsp;Arshdeep Kaur ,&nbsp;Shiffali Middha ,&nbsp;P.D. Babu ,&nbsp;Rubina Ghosh ,&nbsp;P.N. Vishwakarma ,&nbsp;Jaswinder Pal ,&nbsp;Indu Sharma ,&nbsp;Gurpreet Singh ,&nbsp;Mandeep Singh ,&nbsp;Arvind Kumar ,&nbsp;Anupinder Singh","doi":"10.1016/j.ceramint.2024.12.025","DOIUrl":"10.1016/j.ceramint.2024.12.025","url":null,"abstract":"<div><div>Thin flexible mats of IPN-Multiferroic perovskite were prepared using In-situ polymerization of PU/PMMA &amp; (PrFeO₃)_0.24-(PbTiO₃)_0.76). X-ray diffraction peaks confirmed the presence of a tetragonal crystal phase (P<em>4mm</em> No. 99) of perovskite in a non-crystalline interpenetrating polymer network (IPN). The M-H hysteresis revealed the presence of magnetic ordering, whereas the P vs. E loop showed the presence of ferroelectric ordering in composites. The detection of elements present in the sample was done by energy-dispersive X-ray spectroscopy (EDS). The FTIR spectra of flexible mats revealed distinct transmittance peaks indicating various functional groups, including Si-OH, OH, methylene (CH2), urethane carbonyl (C=O), Si-O-Si, Fe-O, Ti-O, and PbO, thus, confirming their expected presence within the sample. The variation in weight loss and elongation at the break due to the incorporation of multiferroic ceramic directly manifested improved mechanical properties of pure IPN. The change in voltage with both frequency and magnetic field, attested for magneto-electric coupling in the prepared flexible sheets. We also observed the magnetoelectric coupling coefficient ‘α_ME’ by subjecting the sample to an AC magnetic field of 20 Oe, scanning frequencies from 150 Hz to 500Hz. The maximum value of ‘α_ME’ was obtained between 180 Hz and 220 Hz. At three different frequencies (180 Hz, 200 Hz, and 220 Hz), the DC magnetic field varied from 0 to 10.31 kOe. The maximum ME coefficient, 1.66 mVcm^-1Oe^-1, is obtained for <em>x</em> = 40 wt%. This predicts their capability to be used in various device applications including magnetic field sensors.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 5","pages":"Pages 5790-5798"},"PeriodicalIF":5.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143357471","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Wear and corrosion resistance of cathodic plasma electrolytic deposited Al2O3-ZrO2 composite ceramic coatings on sintered NdFeB magnet","authors":"Z.H. Rao,&nbsp;J.L. Xu,&nbsp;J. Huang,&nbsp;X.H. Zhang,&nbsp;Y.C. Ma,&nbsp;J.M. Luo","doi":"10.1016/j.ceramint.2024.12.017","DOIUrl":"10.1016/j.ceramint.2024.12.017","url":null,"abstract":"<div><div>To enhance the wear and corrosion resistance of the sintered NdFeB magnet, Al₂O₃-ZrO₂ composite ceramic coatings were fabricated using cathodic plasma electrolytic deposition (CPED) technique. The effect of zirconium sulfate concentrations on the microstructure and properties of the coatings were investigated. The composite ceramic coatings are mainly composed of γ-Al₂O₃ and t-ZrO₂ phases, and the volume fractions of t-ZrO₂ phase gradually increase with increasing the concentrations of zirconium sulfate. At the same time, the surface morphologies of the coatings change from coral reef-like structure to pan-like structure. Furthermore, the negative influence of the composite ceramic coatings on the magnetic properties of the NdFeB magnet also gradually diminishes. The composite ceramic coatings enhance the microhardness of the NdFeB magnet by 1.76 times, and substantially reduce the friction coefficient and wear rate, thereby improving its wear resistance. Concurrently, the composite coatings greatly improve the sulfuric acid immersion corrosion and electrochemical corrosion of the magnet. This paper provides a new protection strategy for the sintered NdFeB magnets.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 5","pages":"Pages 5695-5705"},"PeriodicalIF":5.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143323492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}