Open Ceramics最新文献

{"title":"Towards a debinding-free additive manufacturing of ceramics: A development perspective of water-based LSD and LIS technologies","authors":"Andrea Zocca ,&nbsp;Jens Günster","doi":"10.1016/j.oceram.2024.100632","DOIUrl":"https://doi.org/10.1016/j.oceram.2024.100632","url":null,"abstract":"<div><p>Ceramic additive manufacturing (AM) requires a complex process chain with various post-processing steps that require expensive machines and special expertise. The key to further market penetration is AM that makes it possible to integrate into an already established ceramic process chain. Most successful AM technologies for ceramics are, however, based on processes that initially have been developed for polymeric materials. For ceramics AM, polymers or precursors are loaded with ceramic particles. This strategy facilitates the entry into AM, however the introduction of organic additives into the ceramic process chain represents a considerable technological challenge to ultimately obtain a ceramic component after additive shaping. In the present communication, two technologies based on ceramic suspensions will be introduced, the “layerwise slurry deposition” (LSD) and “laser induced slip casting” (LIS) technology. Both technologies take advantage of the high packing densities reached by conventional slip casting and moreover enable the processing of fines, even nanoparticles.</p></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"19 ","pages":"Article 100632"},"PeriodicalIF":2.9,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666539524000968/pdfft?md5=48814f06be0da5ededd5ad893c7ba1de&pid=1-s2.0-S2666539524000968-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141542099","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"3D printing of multi-scale porous β-tricalcium phosphate scaffolds: Mechanical properties and degradation","authors":"Shareen S.L. Chan ,&nbsp;Daniel E. Heath ,&nbsp;George V. Franks","doi":"10.1016/j.oceram.2024.100630","DOIUrl":"https://doi.org/10.1016/j.oceram.2024.100630","url":null,"abstract":"<div><p>Processing-structure-property relationships of 3D-printed multi-scale porous ceramics were investigated. Direct ink writing (DIW) of oil-templated colloidal pastes produced hierarchically porous beta-tricalcium phosphate (TCP) scaffolds. Print architecture and microporosity within filaments were varied, mimicking bone structure. The scaffolds exhibited 60–70 % porosity with interconnected macropores 300–700 μm and microporosity within the filaments at the 10 micron-scale. Varying surfactant and oil concentrations created two micro-pore morphologies – bubble-like pores (emulsion) and channel-like pores (capillary suspension). Emulsion scaffolds were stronger, stiffer and more reliable than capillary suspension scaffolds under both compression and bending. Reducing nozzle diameter and inter-filament distance improved strength and stiffness, at lower density. Immersed at physiological pH, the hierarchically porous TCP scaffolds' strength and modulus degraded at a moderate rate suitable for bone tissue engineering (BTE). Mechanical behavior can be controlled by manipulating process parameters which influence the material's structure. These properties were comparable with trabecular bone, promising for BTE.</p></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"19 ","pages":"Article 100630"},"PeriodicalIF":2.9,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666539524000944/pdfft?md5=99c7700015025f94a685bab4d1f157a6&pid=1-s2.0-S2666539524000944-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141479629","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"SiC-bonded diamond material with excellent abrasive wear resistance","authors":"Steffen Kunze,&nbsp;Björn Matthey,&nbsp;Mathias Herrmann","doi":"10.1016/j.oceram.2024.100627","DOIUrl":"https://doi.org/10.1016/j.oceram.2024.100627","url":null,"abstract":"<div><p>The wear behavior of SiC bonded diamond materials produced by liquid silicon infiltration in diamond preforms was investigated. The wear behavior in sand blasting tests (SiC abrasives, 5 bar pressure) was correlated with the microstructure. All SiC bonded diamond materials showed a wear, which was approximately 10 times less than the wear behavior of the reference SiC material.</p><p>Systematic changed microstructures were created by increasing the infiltration temperature. As the infiltration temperature increases, a graphite layer is formed at the diamond-SiC interface. At the highest infiltration temperature (1670 °C), the layer thickness reaches approx. 580 nm. The results show that wear resistance is not negatively affected by the graphite layer. On the contrary, for materials with a graphite layer thickness of up to 70 nm, the wear resistance increases by up to 30 %. The wear increases again only at the highest infiltration temperature. However, this is probably caused more by the internal damage to the diamonds and not by the graphite layer at the interface.</p></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"19 ","pages":"Article 100627"},"PeriodicalIF":2.9,"publicationDate":"2024-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666539524000919/pdfft?md5=5f74a470ae59d0bb728ff41c2412cc43&pid=1-s2.0-S2666539524000919-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141542112","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ceramic additive manufacturing and microstructural analysis of tricalcium phosphate implants using X-ray microcomputed tomography","authors":"Sascha Senck ,&nbsp;Jonathan Glinz ,&nbsp;Sarah Heupl ,&nbsp;Johann Kastner ,&nbsp;Klemens Trieb ,&nbsp;Uwe Scheithauer ,&nbsp;Sif Sofie Dahl ,&nbsp;Martin Bonde Jensen","doi":"10.1016/j.oceram.2024.100628","DOIUrl":"https://doi.org/10.1016/j.oceram.2024.100628","url":null,"abstract":"<div><p>Additive manufacturing (AM) of ceramic bone implants from tricalcium phosphate (TCP) offers several benefits for bone regeneration and defect treatment. TCP scaffolds, e.g. featuring lattice or gyroid geometries, can effectively induce bone ingrowth and integration, showing a high potential in the treatment of large bone defects, e.g. as filler material for large bone defects. A major advantage of TCP is its osteoconductivity making it an effective choice for a broad range of orthopedic and dental applications. In addition, AM allows for the possibility to create precise, patient-specific implants with controllable mechanical properties. Those properties can be controlled by the implants' microstructure, e.g. in relation to bulk density and internal porosity. In this contribution, eleven resorbable bone implants were produced from β-tricalcium phosphate (β-TCP) in order to quantify the internal porosity in three dimensions using microcomputed tomography (μ CT). All components were manufactured using an extrusion-based process and scanned using an industrial μCT system at a voxel size of 10 μm. Two samples were physically prepared to allow a high-resolution μCT analysis at a voxel size of 1 μm. Results show that post-processed image data enables the non-destructive inspection of highly complex ceramic AM implants. Using μCT we were able to quantify internal porosity in β-TCP bone implant and quantify the geometry and distribution of wall thicknesses in the gyroid geometry. However, a detailed microstructural analysis is only possible using high-resolution μCT volume data, e.g. in relation to internal porosity. The findings emphasize that ceramic AM is able to produce complex components. However, NDT using μCT is crucial in the development of new materials and geometries. μCT provides high-resolution insights into the internal and external structure of ceramic AM components. It plays a critical role in detecting internal features, including small-scale porosity and delamination which are crucial for the integrity and functionality of medical implants. Moreover, μ<span>CT</span> provides volumetric data that supports the design and manufacturing process at various stages, enabling an iterative approach of continuous improvement in mechanical performance and osseointegration.</p></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"19 ","pages":"Article 100628"},"PeriodicalIF":2.9,"publicationDate":"2024-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666539524000920/pdfft?md5=3cc132b43238daa7d5046863dc9c0d05&pid=1-s2.0-S2666539524000920-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141542101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Green synthesis of nano-MgO using lemon juice for amplified photocatalytic degradation of organic pollutants","authors":"Md. Kawcher Alam ,&nbsp;Md. Sahadat Hossain ,&nbsp;Sumaya Tabassum ,&nbsp;Newaz Mohammed Bahadur ,&nbsp;Samina Ahmed","doi":"10.1016/j.oceram.2024.100625","DOIUrl":"https://doi.org/10.1016/j.oceram.2024.100625","url":null,"abstract":"<div><p>This study examines the photocatalytic activity of the green synthesized (using lemon juice) MgO nanoparticles under a halogen light for the degradation of Congo Red (CR). The characterization of the prepared sample was studied by applying Fourier Transform Infrared (FTIR) Spectroscopy, X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and Thermogravimetric Analysis (TGA). By applying XRD analysis, the crystallographic variables of the MgO NPs were determined and the crystallite size was obtained from a variety of formulas/models (Scherrer equation, Williamson-Hall model, Monshi-Scherrer model, Size-Strain Plot, Halder-Wagner model, etc). The crystallite size was found in a valid range of 4.62–99.03 nm. Photocatalytic degradation of Congo Red (CR) has been made under halogen light by considering a dye concentration of 20 ppm at 40 mL solution for 0.05 g of the catalyst sample. Operating conditions were fixed as neutral pH, 25 °C temperature, and 40 min exposure time of the halogen lamp.</p></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"19 ","pages":"Article 100625"},"PeriodicalIF":2.9,"publicationDate":"2024-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666539524000890/pdfft?md5=0949f6f29864172bd7af5a3ce423d411&pid=1-s2.0-S2666539524000890-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141479630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bimodal grain sized barium titanate dielectrics enabled under the cold sintering process","authors":"Jake A. DeChiara ,&nbsp;Sevag Momjian ,&nbsp;Ke Wang ,&nbsp;Clive A. Randall","doi":"10.1016/j.oceram.2024.100626","DOIUrl":"https://doi.org/10.1016/j.oceram.2024.100626","url":null,"abstract":"<div><p>In barium titanate (BaTiO₃) the relative permittivity varies as a function of grain size due to the influence of various sizes and scaling effects. The cold sintering process (CSP) has been applied to sinter nanocrystalline BaTiO₃ (&lt;200 nm), however in conventionally sintered BaTiO₃ a maximum relative permittivity is achieved at average grain sizes around 0.8 μm. In this work the feasibility of cold sintering 1 μm BaTiO₃ inclusions in ratios of fine-grained BaTiO₃ matrixes from 50 to 200 nm is investigated. Occurrences of both conformal sintering of inclusions into the matrix and constrained sintering with residual porosity are observed. Subsequently, electrical resistivities increased from 1 × 10⁸ Ω cm to approximately 1 × 10¹² Ω cm by a post CSP heat treatment of 500 °C. Relative permittivity of annealed samples increases systematically following a logarithmic mixing law as a function of matrix grain size and increasing the ratio of inclusions to matrix.</p></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"19 ","pages":"Article 100626"},"PeriodicalIF":2.9,"publicationDate":"2024-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666539524000907/pdfft?md5=37ee6d983694ac6a7a42e51907d17c40&pid=1-s2.0-S2666539524000907-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141479628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Use of confocal microscopy to measure the porosity of cement containing sulfocalcic binder: A comparative study","authors":"Klára Pulcová ,&nbsp;Martina Šídlová ,&nbsp;Jan Macháček ,&nbsp;Rostislav Šulc ,&nbsp;Ivona Sedlářová","doi":"10.1016/j.oceram.2024.100624","DOIUrl":"https://doi.org/10.1016/j.oceram.2024.100624","url":null,"abstract":"<div><p>This work proposes an effective methodology for measuring the porosity of mixed hydraulic binders applying image analysis (IA) with confocal microscopy (CM). CM offers a certain simplification of sample preparation compared to the standard procedure EN 480-11, as the steps of sample staining and pore masking are eliminated. A set of cement and a hydraulic clinker-free sulfocalcic binder pastes was prepared with various aeration. Total air content, micro air content and the air pore spacing factor according to EN 480-11 standard were determined for hardened pastes using measuring chords. Subsequently, a new simple Surface porosity evaluation for IA methodology using CM was proposed and results were compared with the standard evaluation. The results of both IA evaluations achieved high agreement and the new porosity Surface evaluation was found to be promising for the determination of total air content. Porosity values measured by both IA methods were further compared with MIP.</p></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"19 ","pages":"Article 100624"},"PeriodicalIF":0.0,"publicationDate":"2024-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666539524000889/pdfft?md5=6e4936890074a6291dda45003611ae8f&pid=1-s2.0-S2666539524000889-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141429701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of densification technology on the microstructure and mechanical properties of high-entropy (Ti, Zr, Hf, Nb, Ta)C ceramic-based cermets","authors":"Dmytro Vedel ,&nbsp;Tamás Csanádi ,&nbsp;Petro Mazur ,&nbsp;Anton Osipov ,&nbsp;Juraj Szabó ,&nbsp;Vladyslav Shyvaniuk ,&nbsp;Richard Sedlák ,&nbsp;Oleksandr Stasiuk ,&nbsp;Veronika Kuchárová ,&nbsp;Oleg Grigoriev","doi":"10.1016/j.oceram.2024.100623","DOIUrl":"10.1016/j.oceram.2024.100623","url":null,"abstract":"<div><p>High-entropy ceramic-based cermets represent a new and promising direction in improving the mechanical properties of conventional hardmetals through the formation of complex microstructures during synthesis. This has been systematically studied in two Co-free, high-entropy (Ti,Zr,Hf,Nb,Ta)C ceramic-based cermets using 10 wt% Ni and 10 wt% FeCrAl metallic binders during hot-press and spark plasma sintering. Fully densified microstructures were achieved in the temperature range of 1400–1500 °C, which is below the melting points of the pure Ni and FeCrAl alloy, owing to the liquid-phase assisted sintering. The optimal densification routes resulted in Vickers hardness (HV₃₀) of 16.77 ± 0.72 and 18.32 ± 0.99 GPa, and fracture toughness (K_{Ic_SENB}) of 5.31 ± 0.41 and 4.83 ± 0.50 MPa m^0.5, respectively for the Ni and FeCrAl bonded cermets. The improved damage tolerance of these cermets compared to the base (Ti,Zr,Hf,Nb,Ta)C high-entropy carbide is related to the reduced grain size and microstructural toughening mechanisms (e.g. crack deflection and bridging).</p></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"19 ","pages":"Article 100623"},"PeriodicalIF":2.9,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666539524000877/pdfft?md5=186399997842a32e97abadbe6c8240f5&pid=1-s2.0-S2666539524000877-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141394539","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Potentiality of some lateritic clayey material from Meiganga as raw material in fired bricks making","authors":"Michele Stella Ngono Mbenti ,&nbsp;Roger Firmin Donald Ntouala ,&nbsp;Rodrigue Cyriaque Kaze ,&nbsp;Marie Thérèse Nanga Bineli ,&nbsp;Arnaud Ngo'o Ze ,&nbsp;Vincent Laurent Onana","doi":"10.1016/j.oceram.2024.100619","DOIUrl":"https://doi.org/10.1016/j.oceram.2024.100619","url":null,"abstract":"<div><p>The Meiganga lateritic clays and termite mounds were characterized for their use as construction materials. The six collected samples were subjected to mineralogical, geochemical, and physico-mechanical tests. Quartz, kaolinite, hematite, goethite, gibbsite, muscovite, and anatase are the main minerals in raw materials, while after firing at 1050 °C, mullite is formed. The SiO₂/Al₂O₃ ratio greater than 1 indicates a high SiO₂ content, which is consistent with the presence of quartz as an associate mineral to kaolinite. Considering linear shrinkage globally less than 5 % and flexural and compressive strengths greater than 2 and 7 MPa, respectively, four clay materials are suitable to produce bricks at all the studied temperatures, whereas two others only after firing at 1050 °C. As the studied characteristics do not depend on the nature of the material, exploring termite mound material in the Meiganga area would provide additional good-quality material to make up for any deficit that might arise.</p></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"19 ","pages":"Article 100619"},"PeriodicalIF":0.0,"publicationDate":"2024-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S266653952400083X/pdfft?md5=0b0830af3d0a86aa8ca01e68bbf8eb9a&pid=1-s2.0-S266653952400083X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141324092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermodynamic modeling of the Hf-Ta-O system for the design of oxidation resistant HfC-TaC ceramics","authors":"Rahim Zaman,&nbsp;Elizabeth J. Opila,&nbsp;Bi-Cheng Zhou","doi":"10.1016/j.oceram.2024.100618","DOIUrl":"https://doi.org/10.1016/j.oceram.2024.100618","url":null,"abstract":"<div><p>An improved understanding of the oxidation resistance of HfC-TaC ultra-high temperature ceramics (UHTCs) is developed through modeling of the phase equilibria in the Hf-Ta-O system and HfO₂-Ta₂O₅ isoplethal section. CALculation of PHAse Diagrams (CALPHAD) thermodynamic models of the systems are developed in conjunction with experimental data from the literature and first-principles calculations. Density functional theory (DFT) calculations accurately describe thermodynamic properties of binary oxides in the Hf-Ta-O system and predict cation disorder in Hf_(n-5)/2Ta₂O_n. The ternary modeling includes revised models of the Hf–O system and existing models of the Ta–O and Hf–Ta systems. The Hf_(n-5)/2Ta₂O_n ternary oxide series is modeled as three entropically stabilized solid solutions with disordered cation sublattices that increase in stability with structure size. Hf₄Ta₂O₁₃ is considered a metastable phase based on the present models and phase diagram, consistent with the lack of experimental data supporting its stability. The calculated phase diagrams improve upon prior ones and predict optimal thermal resistance of HfC-TaC ceramics at compositions between 3HfC-1TaC and 4HfC-1TaC.</p></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"19 ","pages":"Article 100618"},"PeriodicalIF":0.0,"publicationDate":"2024-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666539524000828/pdfft?md5=ad76d090657f54c57f8cd0323f8ecd75&pid=1-s2.0-S2666539524000828-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141324091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}