Open CeramicsPub Date : 2024-10-02DOI: 10.1016/j.oceram.2024.100692
Sonia Marín-Cortés , Mattia Biesuz , Aida Serrano , Emanuele De Bona , Esther Enríquez , José F. Fernández , Vincenzo M. Sglavo
{"title":"Promoting the circularity of ceramic materials through cold sintering of aggregates from construction and demolition waste","authors":"Sonia Marín-Cortés , Mattia Biesuz , Aida Serrano , Emanuele De Bona , Esther Enríquez , José F. Fernández , Vincenzo M. Sglavo","doi":"10.1016/j.oceram.2024.100692","DOIUrl":"10.1016/j.oceram.2024.100692","url":null,"abstract":"<div><div>A ceramic composition containing 95 wt% of construction and demolition waste-like material was consolidated by cold sintering process at 200 °C using KOH water solutions as the liquid medium. The relative density of the samples reaches ∼90 % of the theoretical one for process conditions of 600 MPa and 60 min. A post-annealing process at 1100 °C of the as-cold sintered samples causes a slight increase in the relative density and of their mechanical strength compared with conventionally sintered samples at 1100 °C and increases the shape factor of the Weibull distribution, thus increasing the reliability of the component. It is shown that cold sintering of the material avoids its high pyroplasticity, providing low shrinkage and reducing internal defects in the ceramic. This work represents the first exploration of the viability of manufacturing ceramic tiles with high recycled content contributing to the transition to a greener world.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"20 ","pages":"Article 100692"},"PeriodicalIF":2.9,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142421931","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}
Open CeramicsPub Date : 2024-10-02DOI: 10.1016/j.oceram.2024.100691
Md Elias , Ehsanur Rahman , Sonia Akter , Mohammad Awlad Hossain , Rumana A. Jahan , Md Nizam Uddin , Shakhawat H. Firoz
{"title":"Eco-friendly fabrication of ZnO-TiO2-rGO nanocomposite for efficient adsorption-assisted organic dyes elimination","authors":"Md Elias , Ehsanur Rahman , Sonia Akter , Mohammad Awlad Hossain , Rumana A. Jahan , Md Nizam Uddin , Shakhawat H. Firoz","doi":"10.1016/j.oceram.2024.100691","DOIUrl":"10.1016/j.oceram.2024.100691","url":null,"abstract":"<div><div>The growing interest in combining the photocatalytic properties of semiconductors like ZnO and TiO<sub>2</sub> with the superior electron conduction capabilities of graphene has resulted in the successful synthesis of in-situ reduced graphene oxide (rGO) supported ZnO-TiO<sub>2</sub> nanostructures through a simple microwave-assisted synthesis method. X-ray Diffraction Spectroscopy (XRD), Field Emission Scanning Electron Microscope (FESEM), UV–visible spectroscopy (UV–vis), and Fourier Transform Infrared Spectroscopy (FTIR) were employed to characterize structural, morphological and optical properties as well as surface functional groups of the synthesized products. The XRD measurements of our synthesized samples confirm both structural crystallinity and phase purity, while the FTIR analysis verifies the complete reduction of graphene oxide (GO) to reduced graphene oxide (rGO). The synthesized ternary nanocomposite ZnO-TiO<sub>2</sub>-rGO exhibited a remarkable 100 % adsorption-assisted removal efficiency for 20 mg/L methylene blue (MB) dye under ultraviolet light illumination within 120 min, along with a 56 % dye adsorption removal efficiency in the same time interval. In comparison, pure ZnO showed 0 % adsorption and only 31 % photocatalytic efficiency at the similar condition. Remarkably, the ZnO-TiO<sub>2</sub>-rGO nanocomposite exhibited exceptional photocatalytic activity mediated by adsorption, achieving complete degradation of MB dye within 5 min under sunlight irradiation. The photocatalytic efficiency and dye adsorption capacity were found to be significantly lower for the anionic dye methyl orange (MO) compared to the cationic MB dye. The study thoroughly investigated the influence of catalyst dose and initial dye concentration on photodegradation. The proposed mechanism indicates that the extensive surface area and numerous active sites on the rGO promote adsorption, which is then followed by degradation through the metal oxides. Overall, the results unveil that the microwave-assisted synthesis of ZnO-TiO<sub>2</sub>-rGO nanocomposite is a promising and environmentally friendly approach for efficiently degrading dyes from contaminated wastewater using both UV light and natural sunlight irradiation.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"20 ","pages":"Article 100691"},"PeriodicalIF":2.9,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142421930","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}
Open CeramicsPub Date : 2024-09-30DOI: 10.1016/j.oceram.2024.100690
Francesco Baino , Federico Gaido , Roberta Gabrieli , Dario Alidoost , Alessandro Schiavi , Mehdi Mohammadi , Martin Schwentenwein , Dilshat Tulyaganov , Enrica Verné
{"title":"Vat photopolymerization of ultra-porous bioactive glass foams","authors":"Francesco Baino , Federico Gaido , Roberta Gabrieli , Dario Alidoost , Alessandro Schiavi , Mehdi Mohammadi , Martin Schwentenwein , Dilshat Tulyaganov , Enrica Verné","doi":"10.1016/j.oceram.2024.100690","DOIUrl":"10.1016/j.oceram.2024.100690","url":null,"abstract":"<div><div>The introduction of additive manufacturing technologies in the field of biomaterials science has opened new horizons for regenerative medicine. In this work, we pushed the potential of vat polymerization to the limit for fabricating ultra-porous bioactive SiO<sub>2</sub>-CaO-MgO-P<sub>2</sub>O<sub>5</sub>-CaF<sub>2</sub>-Na<sub>2</sub>O glass scaffolds with bone-like architectural characteristics. The tomographic reconstruction of an open-cell foam was used as input file to the printing system and reliably reproduced in all its exquisite details, as assessed by morphological analyses of sintered scaffolds (thickness of single struts 35 μm, exceptionally high porosity around 94 vol%, most pores with size from 500 to 900 μm). Immersion studies in simulated body fluid (SBF) revealed the apatite-forming ability (i.e., in vitro bioactivity) of the scaffolds, the surface of which started being coated by calcium phosphate after just 3 days from the beginning of the experiments. Taken together, these results show great promise for application of such scaffolds in bone defect repair.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"20 ","pages":"Article 100690"},"PeriodicalIF":2.9,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142421929","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}
Open CeramicsPub Date : 2024-09-30DOI: 10.1016/j.oceram.2024.100689
Ahmed Gamal Abd-Elsatar , Hamada Elsayed , Hana Kanková , Branislav Hruška , Jozef Kraxner , Enrico Bernardo , Dušan Galusek
{"title":"Ion-exchange enhancement of borosilicate glass vials for pharmaceutical packaging","authors":"Ahmed Gamal Abd-Elsatar , Hamada Elsayed , Hana Kanková , Branislav Hruška , Jozef Kraxner , Enrico Bernardo , Dušan Galusek","doi":"10.1016/j.oceram.2024.100689","DOIUrl":"10.1016/j.oceram.2024.100689","url":null,"abstract":"<div><div>Pharmaceutical containers for parenteral use, including vials, ampoules, prefilled syringes, and cartridges, are traditionally made of glass. However, the most commonly used type, borosilicate glass, is susceptible to issues such as breakage, corrosion, and delamination, which can jeopardize the safety and efficacy of the enclosed drugs. To address these concerns without compromising the visual or qualitative aspects of borosilicate medical glass vials, this study aimed at the enhancement of their mechanical, chemical, and corrosion resistance. A single ion exchange treatment (IET) in a salt bath of molten KNO<sub>3</sub> at temperatures of 400, 450, and 500 °C for 2, 12, and 24 h was applied. The effects of the ion exchange process performed under different conditions were assessed by measuring Vickers hardness, crushing load, and chemical durability. The mechanical load required to crush full-body vials after the ion exchange process at 500 °C for 2, 12, and 24 h showed an increase in the applied force values (1650 ± 80, 2340 ± 80, and 2325 ± 40 N) compared to untreated vials (1157 ± 20 N).</div><div>No radial cracks were observed on the surface of treated glass vials after indentation, indicating the presence of compressive stresses that prevented the initiation and propagation of cracks. The EDS analysis confirmed an increase in potassium concentration and a decrease in sodium content near the surface of samples modified by ion exchange treatment. The treated samples showed appropriate chemical stability in different acidic, basic, and neutral solutions. Conspicuous changes are noticed in the Raman spectra after IET, specifically in the Q<sub>n</sub> species region. The results indicate the potential of the ion exchange treatment in enhancing the properties of borosilicate glass vials by relatively simple and easily scalable techniques.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"20 ","pages":"Article 100689"},"PeriodicalIF":2.9,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142421933","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":"Synthesis of polycrystalline Ta₂O₅ inverse opal photonic crystal powders and their optical characterization","authors":"Taiki Maekawa , Hiroyuki Maekawa , Yuto Ikeda , Tomoya Onoe , Geoffrey I.N. Waterhouse , Kei-ichiro Murai , Toshihiro Moriga","doi":"10.1016/j.oceram.2024.100688","DOIUrl":"10.1016/j.oceram.2024.100688","url":null,"abstract":"<div><div>Polycrystalline Ta<sub>2</sub>O<sub>5</sub> inverse opal (IO) photonic crystal powders were synthesized using PMMA colloidal crystals as sacrificial templates. We prepared Ta<sub>2</sub>O<sub>5</sub> IO powders with vibrant structural colors at UV–vis wavelengths. The photonic bandgaps (PBGs) in the Ta<sub>2</sub>O<sub>5</sub> IO powders red-shifted as a function of both the macropore diameter and the refractive index of the medium filling the macropores. Owing to their polycrystalline structure, the Ta<sub>2</sub>O<sub>5</sub> IO powders exposed PBGs for various FCC facets, making investigation of their optical properties significantly more complex than Ta<sub>2</sub>O<sub>5</sub> IO thin films that preferentially expose only (111) planes as studied previously. Due to the overlap of the PBGs from different FCC facets and the defects that cause light scattering, much of the typical angle-dependent structural color observed in IO thin films was lost in the Ta<sub>2</sub>O<sub>5</sub> IO powders. This study offers new insights into the optical properties of IO powders.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"20 ","pages":"Article 100688"},"PeriodicalIF":2.9,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142442208","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}
Open CeramicsPub Date : 2024-09-26DOI: 10.1016/j.oceram.2024.100687
Mohammed Ali M. Rihan , Richard Ocharo Onchiri , Naftary Gathimba , Bernadette Sabuni
{"title":"Assessing the durability performance of geopolymer concrete utilizing fly ash and sugarcane bagasse ash as sustainable binders","authors":"Mohammed Ali M. Rihan , Richard Ocharo Onchiri , Naftary Gathimba , Bernadette Sabuni","doi":"10.1016/j.oceram.2024.100687","DOIUrl":"10.1016/j.oceram.2024.100687","url":null,"abstract":"<div><div>Geopolymer or alkali-activated binders are being recognized as an eco-friendly, sustainable substitute for ordinary Portland cement (OPC). The development of high-performance concrete with improved durability and mechanical properties and the addition of environmentally friendly components is a continuous effort. Therefore, the current work examines the durability of fly ash-sugarcane bagasse ash mechanical characteristics in terms of water absorption, exposure to elevated temperatures, and acid resistance. The mechanical properties of the geopolymer concrete (GPC) and OPC concrete specimens were evaluated after being subjected to elevated temperatures of 200 °C, 400 °C, 600 °C, and 800 °C. The acid resistance was determined by submerging the concrete specimens in 3 % sulfuric acid (H<sub>2</sub>SO<sub>4</sub>). The acid resistance of the specimens was evaluated through visual inspection, weight variation, and the percentage loss in compressive strength (C<sub>R</sub>). According to the study, C<sub>R</sub> typically drops as temperature increases from ambient temperature to 800 °C. However, the rate of decline reduced as temperature increased from ambient temperature to 200 °C. Moreover, the GPC specimens showed a strength loss between 13 % and 21 % following 28 days of sulfuric acid immersion. In contrast, exposure to sulfuric acid caused a 51 % drop in strength for the OPC concrete samples.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"20 ","pages":"Article 100687"},"PeriodicalIF":2.9,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142357412","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":"Influences of additives on the properties of geopolymer matrix composites (GMCS) for high-temperature applications (1150 °C)","authors":"Quentin Cligny , Ameni Gharzouni , Patrice Duport , Damien Brandt , Sylvie Rossignol","doi":"10.1016/j.oceram.2024.100685","DOIUrl":"10.1016/j.oceram.2024.100685","url":null,"abstract":"<div><div>In this study, the influence of different additives on a geopolymer matrix composite (GMC) was explored as an alternative to a ceramic matrix composite (CMC) for thermostructural applications. Different GMCs using an N610 textile (10 × 10 cm<sup>2</sup>) and various additives (SrCO<sub>3</sub>, BaCO<sub>3</sub>, BaSO<sub>4</sub>, MgO and Al<sub>2</sub>O<sub>3</sub> and mullite-rich powder) were cured under 6 MPa at 120 °C for 2 h. The mechanical, microstructural and structural data of the composites were compared with those of the geopolymer matrix after thermal treatment at 1150 °C. The results showed that the addition of alkali-earth barium carbonate or sulfate to the geopolymer matrix facilitated the formation of alkali-earth aluminosilicate crystalline phases and a higher viscous flow apparition temperature (990 °C), which did not enhance its mechanical properties (50 MPa) due to poor impregnation of the textile. Refractory additives such as MgO and Al<sub>2</sub>O<sub>3</sub> in the geopolymer matrix support fiber impregnation with a low-viscous-flow apparition temperature (865 °C) and the formation of crystalline phases such as forsterite, spinel and sapphirine, which act as reinforcements, allowing a flexural strength up to 80 MPa. The addition of a refractory compound, such as mullite, leads to better embedding of fibers and a flexural strength reaching 100 MPa. To conclude, mixing the geopolymer matrix with refractory compounds results in a successful thermo-structural geopolymer composite.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"20 ","pages":"Article 100685"},"PeriodicalIF":2.9,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142421928","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}
Open CeramicsPub Date : 2024-09-21DOI: 10.1016/j.oceram.2024.100686
Tim Stötzel , Swantje Funk , Tobias Fey
{"title":"The sound of porosity: Suitability of the impulse excitation technique (IET) to determine the Young's modulus of 2D macroporous ceramics","authors":"Tim Stötzel , Swantje Funk , Tobias Fey","doi":"10.1016/j.oceram.2024.100686","DOIUrl":"10.1016/j.oceram.2024.100686","url":null,"abstract":"<div><div>The presence of pores in a ceramic leads to a lower Young's modulus compared to dense material. For the development of porous ceramics with tailored elastic properties, an exact determination of the Young's modulus is required, especially for industrial applications. Therefore, we investigated the suitability of the non-destructive impulse excitation technique for measuring the dynamic Young's modulus of two-dimensional ceramics with low porosity (P < 19 %). For rectangular samples it was shown that the measurement results depend on the geometric pore position, as added pores outside the nodal lines of the fundamental flexural vibration had no influence on the result. Pores in the inner part of the sample led to a decrease of the Young's modulus that is in good agreement with empirical and analytical models. For the investigated interval of porosity range, the influence of pore size and geometric position on the reduction of the Young's modulus was determined.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"20 ","pages":"Article 100686"},"PeriodicalIF":2.9,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666539524001500/pdfft?md5=949bfb5f0a3940870461e6621efc0076&pid=1-s2.0-S2666539524001500-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142316156","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}
Open CeramicsPub Date : 2024-09-19DOI: 10.1016/j.oceram.2024.100683
Oxel Urra , B. Ferrari , A.J. Sanchez-Herencia , Giorgia Franchin , Paolo Colombo
{"title":"Colloidal route towards sodium ionic conductor (NASICON) 3D complex solid electrolyte structures fabricated by direct ink writing (DIW)","authors":"Oxel Urra , B. Ferrari , A.J. Sanchez-Herencia , Giorgia Franchin , Paolo Colombo","doi":"10.1016/j.oceram.2024.100683","DOIUrl":"10.1016/j.oceram.2024.100683","url":null,"abstract":"<div><div>Progressing towards a sustainable energy model, safer new generation high-performance energy storage devices with large energy density and power are needed. In this sense, the improvement in terms of efficiency and sustainability has led to the interest in solid-state batteries (SSBs). Lately, sodium-ion batteries (SIBs) have become an emerging alternative due to the abundance of raw materials, low cost, and improvements in terms of fast sodium-ion conductor solid electrolytes (SCSEs). Among all the SCSEs, the sodium superionic conductor (NASICON) type electrolyte is one of the most well-known electrolytes, being widely developed in terms of synthesis and materials. However, the processing and manufacturing of these electrolytes have gone almost unnoticed, without considering that well-designed structures of electrodes/electrolytes are the bridge toward turning advanced energy materials into high-performance devices. This work presents the fabrication of 3D complex structures based on NASICON sodium solid electrolytes, obtained for the first time by direct ink writing (DIW). Through a colloidal route, fine NASICON phase powder with high pureness was prepared, enabling the manufacturing of intricate NASICON-printed electrolytes in a one-step fabrication process. By optimizing the ink, a dense electrolyte layer, acting as an ionic conductor and separator, was inserted between two complex porous pattern layers obtaining a device with a total height below 1.15 mm. Further, the densification of the 3D electrolyte was enhanced, reaching high ionic conductivities at room temperature (3.10<sup>−4</sup> S cm<sup>−1</sup>). Thus, a high-performance sodium ion conductor NASICON solid electrolyte with shorter diffusion pathways and larger interfacial surface areas between electrode/electrolyte was obtained, improving the overall electrochemical performance of the device by a 3D layer-by-layer design.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"20 ","pages":"Article 100683"},"PeriodicalIF":2.9,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666539524001470/pdfft?md5=a6302eca655d69581ed0b7a3ca04f7d7&pid=1-s2.0-S2666539524001470-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142312599","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}
Open CeramicsPub Date : 2024-09-19DOI: 10.1016/j.oceram.2024.100684
Rosa Maria da Rocha , Francisco Cristovão Lourenço de Melo , Frank Ferrer Sene , João Marcos Kruszynski de Assis , Miriam Kasumi Hwang Yassuda
{"title":"Characterization of (Zr,Ti)B2-SiC composites obtained by hot press sintering of ZrB2-SiC-TiO2 powder mixtures","authors":"Rosa Maria da Rocha , Francisco Cristovão Lourenço de Melo , Frank Ferrer Sene , João Marcos Kruszynski de Assis , Miriam Kasumi Hwang Yassuda","doi":"10.1016/j.oceram.2024.100684","DOIUrl":"10.1016/j.oceram.2024.100684","url":null,"abstract":"<div><div>The ability to enhance mechanical and oxidation properties for severe environmental applications has led to substantial academic interest in multiphase ultra-high temperature ceramics (UHTC). The purpose of this work is to study the in-situ solid solution formation of (Zr,Ti)B<sub>2</sub> from ZrB<sub>2</sub> and TiO<sub>2</sub> in a ZrB<sub>2</sub>-SiC composite using hot pressing reaction sintering. For this, a mixture of 10, 20, and 30 % vol% SiC with ZrB<sub>2</sub> was mixed with 2.0 wt% TiO<sub>2</sub>. Hot pressing sintering was performed with a load of 20 MPa at a final temperature of 1850 °C/30 min in an argon atmosphere. The microstructures, crystalline phases, densities, mechanical properties, and oxidation resistance of the composites were examined and compared with ZrB<sub>2</sub>-SiC samples lacking TiO<sub>2</sub>. In samples where TiO<sub>2</sub> was added, the matrix grain size slightly decreased, the fracture mode was mainly intergranular, and the SiC grain morphology changed the aspect ratio to be more equiaxed. The solid solution (Zr,Ti)B<sub>2</sub> was produced, and it was demonstrated by EDS elemental map images and the XRD analysis that Ti atoms incorporate into the ZrB<sub>2</sub> crystalline structure. The development of solid solutions showed no impact on relative densities or Vickers hardness. However, the solid solution formation favored an improvement in fracture toughness, probably owing to the smaller matrix grain size and intergranular fracture mode. Samples exhibiting (Zr,Ti)B<sub>2</sub> formation presented lower oxidation resistance than undoped samples in the same oxidizing condition.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"20 ","pages":"Article 100684"},"PeriodicalIF":2.9,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666539524001482/pdfft?md5=9ab1ee2a0414ae11a8f658ae073b69be&pid=1-s2.0-S2666539524001482-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142312600","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}