Article
Materials Science, Ceramics
Ming Zhu, Jian Chen, Wen-hui Chen, Jia-qi Zheng, Ning-ning Ma, Xue-jian Liu, Zhong-ming Chen, Zheng-ren Huang
Summary: This study investigated the influence of different AlN additions on the microstructure, electrical, and mechanical properties of SiC-AlN ceramics. Higher AlN addition led to smaller grain size and increased varistor voltage. The increase in varistor voltage was attributed to the improvement in grain boundary resistance due to carrier compensation and increased number of Schottky barriers. Comparisons were also made between the electrical properties of samples sintered under N-2 and Ar atmospheres, with significantly higher varistor voltage observed in samples sintered under N-2. Additionally, the mechanical properties remained relatively stable with the increase in AlN content, except for a slight reduction in Vickers hardness.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Rohit Malik, Young-Wook Kim
Summary: The study found that moderate AlN addition significantly reduces the electrical resistivity of SiC ceramics, while excessive AlN addition can lead to an increase in resistivity. This is due to changes in carrier density and the formation of electrically insulating solid solutions and grain boundaries.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Review
Materials Science, Multidisciplinary
Hadi Dehghani, Mahdi Khodaei, Omid Yaghobizadeh, Nasser Ehsani, Hamid Reza Baharvandi, S. Hojat Naghavi Alhosseini, Hassan Javi
Summary: The physical and mechanical properties of SiC ceramics have attracted researchers' attention, leading to attempts to use additives to improve their weaknesses. Factors such as type and amount of additives, atmosphere, sintering time and temperature, and size of SiC particles play important roles in influencing the properties of SiC ceramics. This paper focuses on investigating the impact of AlN-Y2O3, AlN-Re2O3, atmosphere type, and annealing heat treatment on the toughness of pressureless sintered SiC ceramics.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Shahabeddin Jafari, Mohammad Bavand-Vandchali, Mehri Mashhadi, Ali Nemati
Summary: The study investigates the effects of HfB2 addition on the sintering behavior, densification, and microstructure of ZrB2-SiC in the presence of B4C and MoSi2 as a sintering catalyst. Results show that increasing HfB2 leads to higher density, with samples containing MoSi2 having the highest density. X-Ray diffraction revealed the formation of ZrB2HfB2 solid solution, and the addition of HfB2 improves microstructural properties.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Materials Science, Ceramics
Rosa Maria da Rocha, Christian Frederico Von Dollinger, Francisco Cristovao Lourenco de Melo, Frank Ferrer Sene, Miriam Kasumi Hwang Yassuda
Summary: This study aimed to obtain a multiphase composite of (Zr,Ti)B2-SiC through pressureless sintering. The addition of TiO2 affected solid solution formation, densification, microstructure, and mechanical properties. 2.0 wt% TiO2 was added to ZrB2-SiC composites with 10-30 vol% SiC and sintered at 2050 degrees C. The composites doped with TiO2 exhibited improved fracture toughness but slightly lower Vickers hardness compared to composites without TiO2 addition.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Andrew Gibson, Yinsheng Li, Ruy Sebastian Bonilla, Richard Todd
Summary: The application of an electric field over a ceramic powder compact at elevated temperatures can achieve flash sintering in a shorter time compared to conventional sintering, without the need for external pressure. By adding specific sintering aids, high-density sintering can be achieved at lower temperatures.
Article
Materials Science, Ceramics
Ali Razmjoo, Hamid Reza Baharvandi, Nasser Ehsani
Summary: The effect of adding nano-beta-SiC and graphene particles on the sinterability behavior and microstructure of SiC composite has been investigated. The results showed that an appropriate amount of nano-beta-SiC and graphene particles can improve the properties of the composite material, but excessive additives can lead to increased porosity and agglomeration, deteriorating the performance.
JOURNAL OF THE KOREAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Jeong-Ah Yeom, Young-Wook Kim, Wook Ki Jung, Dong-Ik Cheong, Eul Son Kang
Summary: This study investigated the effects of B4C content on the specific stiffness, mechanical properties, and thermal properties of pressureless-sintered SiC ceramics. SiC ceramics with 2.5 wt% C and 0.7-20 wt% B4C as sintering aids were successfully sintered to over 99.4% of theoretical density at 2150 degrees C in Ar. The specific stiffness of SiC ceramics increased from 136.1 x 106 to 144.4 x 106 m2 & BULL;s- 2 as the B4C content increased from 0.7 to 20 wt%.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
B. Chahhou, J. Roger
Summary: The SPS reactive sintering of SiC/Ti3SiC2 composites with high SiC contents was studied. It was found that silicon lack was a limitation in the synthesis, and SiC additions had a deleterious effect on the reaction and densification. The composites with different SiC contents were successfully obtained.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
Yu Pan, Jinshan Zhang, Xinxin Wu, Yucheng Yang, Fan Kuang, Ce Zhang, Dong Lu, Xin Lu
Summary: We successfully fabricated a high-density and fine-grain titanium material by adding a small amount of CaB6 via powder metallurgy pressureless sintering route. The addition of CaB6 promotes the diffusion of titanium atoms and the formation of nano-sized CaTiO3 particles, resulting in increased sintered density. The presence of TiB whiskers and CaTiO3 particles in the titanium matrix creates a smaller grain size and enhances the grain growth activation energy. This study provides a feasible way to produce high-density and fine-grain titanium materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Ziyan Zhao, Qian Qi, Mengna Ma, Runhao Han, Qinlu Shang, Shuyu Yao
Summary: TiC/Ni composites were fabricated using pressureless reactive sintering method, with the formation mechanism divided into two stages: formation of TiC layer and Ni skeleton in the first stage, and formation of eutectic liquid phase in the second stage.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Chemistry, Physical
Zhigang Yang, Yubo Gong, Shuqin Zhang, Xinran Lv, Jie Hu, Guanglei Zhang, Gang Yu, Shaolei Song
Summary: Three kinds of high-entropy metal diboride composites were successfully prepared by pressureless sintering, using Ni as the binder phase. The results demonstrated that the synthesis method effectively improved the density and fracture toughness of the composites, leading to excellent properties. The composites showed increased toughness while maintaining high hardness at a heat-treating temperature of 1600 degrees C.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Zhiwei Lin, Xinpeng Zhao, Chengwei Wang, Qi Dong, Ji Qian, Guangran Zhang, Alexandra H. Brozena, Xizheng Wang, Shuaiming He, Weiwei Ping, Gang Chen, Yong Pei, Chaolun Zheng, Bryson Callie Clifford, Min Hong, Yiquan Wu, Bao Yang, Jian Luo, Paul Albertus, Liangbing Hu
Summary: This study reports an ultrafast high-temperature sintering (UHS) technique for the rapid fabrication of high-quality silica glass. Using UHS, silica precursors can be densified within seconds, resulting in sintered glasses with high relative densities and high visible transmittances. The UHS technique can also be extended to sinter other functional glasses and transparent ceramics.
Article
Materials Science, Ceramics
Behnam Salmany Kozekanan, Alireza Moradkhani, Hamidreza Baharvandi, Naser Ehsani
Summary: In this study, thermodynamic and phase analysis of SiC-Nano/microB(4)C composites with varying weight percentages of secondary phase were conducted. It was found that the addition of nanoB(4)C increased the peak intensity and amount of graphitization in the composite material, resulting in improved structural strength.
JOURNAL OF THE KOREAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Sai Li, Yifeng Li, Quanwei Wang, Kai Miao, Xue Liang, Zhongliang Lu, Dichen Li
Summary: A novel method combining DIW and pressureless infiltration was proposed for fabricating 3DSiC/Al composites, where carbon fiber was added to DIW ink as a pore-forming agent. The study investigated the effects of SiC particle size and carbon fiber content on mechanical properties and infiltration process, and analyzed the interfacial and interpenetrating phase compositions of the samples through SEM, EDS, and XRD. The results showed improved infiltration effect with carbon fiber and different thicknesses of SiO2 layers affecting the process differently, with the final sample exhibiting good mechanical properties.
CERAMICS INTERNATIONAL
(2021)
Review
Materials Science, Ceramics
Ibrahim M. I. Bayoumi, Emad M. M. Ewais, Ahmed A. M. El-Amir
Summary: This article provides a brief introduction to the rheology of refractory concretes, discussing the variable factors influencing their flowability and their impact on properties. Measurements of rheology using conventional techniques and mathematical models are used to clarify the subject. Insights into the rheology of alumina-silica containing castables are gained through examining submicron and nano sized particles. The rheology of refractory concrete can be properly adjusted according to the application method and specific requirements.
BOLETIN DE LA SOCIEDAD ESPANOLA DE CERAMICA Y VIDRIO
(2022)
Article
Materials Science, Ceramics
Zaki I. Zaki, Mohsen Al-qahtani, Saad H. Alotaibi, Mohamed H. El-Sadek, Hesham Ahmed, Yasser M. Z. Ahmed
Summary: Composites of NbC/ZrO(2 )reinforced with different weight ratios of Cr metal were prepared by dynamic compaction combustion. Factors controlling the synthesis process, microstructure, and mechanical properties were studied. The addition of Cr was found to reduce porosity and increase hardness in the samples.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2021)
Article
Environmental Sciences
Dina H. A. Besisa, Emad M. M. Ewais, Yasser M. Z. Ahmed
Summary: The study aims to convert lead silicate glass waste (LSG) containing toxic lead compounds into novel advanced ceramic materials by adding chromia Cr2O3 and hematite Fe2O3 ceramics during the recovery process. The evaluation of the produced composites showed that an addition of chromia and hematite as well as increasing their content to 15% enhanced the microstructural features, optical, electrical, and magnetic properties of the composites. Cr2O3/LSG composites are considered promising optical and electrical materials, while Fe2O3/LSG composites showed the highest optical and magnetic properties, suitable for optoelectronic and magneto-optical applications.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Materials Science, Ceramics
Ahmed A. M. El-Amir, Amira M. M. Amin, Emad M. M. Ewais, A. A. El-Maddah, Mohsen Arab, Ahmed A. Amer
Summary: Calcium-strontium aluminate cement (CSAC) was successfully prepared for the first time from celestite mineral and corundum via a solid-state reaction. The optimal mixes for CSAC preparation were selected based on physico-chemical and mechanical characteristics, meeting international standard requirements. The hydration products of the cement pastes were mainly strontium aluminate hydrates, demonstrating the potential industrial-scale utilization of celestite mineral in CSAC production.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Amira M. M. Amin, Yosra M. M. Soliman, S. I. El-Dek, Yasser M. Z. Ahmed, A. H. Zaki
Summary: The study investigated the suitability of recycling industrial wastes into valuable zinc ferrite ceramics. Results showed that ferrites synthesized from pure oxides and mixtures containing wastes exhibited similar physical and magnetic properties.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Materials Science, Ceramics
Dina H. A. Besisa, Emad M. M. Ewais, Hanan H. Mohamed
Summary: This work proposes a new high temperature composite material based on black Al2O3/CuO ceramics, which is produced with a simple and low-cost method. CuO is added to alumina to enhance its sinterability and properties for solar energy absorption. The study includes a detailed investigation of the material processing and evaluation of its phase composition, densification, and microstructural features. Thermal properties and mechanical durability are optimized to ensure the sustainability of the material. The results show that the addition of a small percentage of CuO to Al2O3 significantly enhances its densification, microstructure, thermal and mechanical properties. The composite with 10 wt% CuO exhibits the highest thermal conductivity, best thermal emissivity, lowest thermal expansion, outstanding thermal shock resistance, and mechanical durability. Therefore, Al2O3/CuO composites can be considered as a promising material for high temperature solar receivers.
CERAMICS INTERNATIONAL
(2022)
Article
Multidisciplinary Sciences
Nada H. A. Besisa, Dina H. A. Besisa, Emad M. M. Ewais
Summary: This work focuses on producing high-performance alumina/aluminum titanate composites with high thermal and mechanical properties for high-temperature applications. By adding different contents of rutile to alumina, the researchers were able to enhance the sinterability and thermo-mechanical response of the composites. The addition of rutile not only improved the density and mechanical strength, but also enhanced the thermal properties and stability of the composites.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Ceramics
Ahmed A. M. El-Amir, Mohammed A. A. Attia, Thomas Fend, Emad M. M. Ewais
Summary: This research presents the possibility of producing durable foam glasses with homogeneous microstructure and improved properties using SiC/AlN foaming agent. The foam glass fabricated had a crack-free, 3-D cellular structure with different geometries and exhibited lightweight, high strength, low thermal conductivity, and high gas bubble content. It conforms to international standard for commercial glass foams and has potential applications in sustainable buildings and energy efficiency in industry.
JOURNAL OF THE KOREAN CERAMIC SOCIETY
(2022)
Article
Environmental Sciences
Dina H. A. Besisa, Hanan H. Mohamed, Emad M. M. Ewais, Yasser M. Z. Ahmed, Amira M. M. Amin
Summary: This study introduces new ceramics/glass composites made from industrial lead silicate glass (LSG) wastes. By adding chromia Cr2O3 and hematite Fe2O3 ceramics, the hazardous waste materials are converted into advanced optical materials with improved morphological properties and optical and magnetic behaviors. The results show that the composite with 30% of Cr2O3/Fe2O3 has the highest optical absorbance, the lowest band gap energy, the highest refractive index, and the best magnetic behavior.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Materials Science, Ceramics
Dina H. A. Besisa, Emad M. M. Ewais, Hanan H. Mohamed, Nada Besisa, Essam A. Mohamed
Summary: This paper presents a detailed study of the optical performance and thermal stress durability of black Al2O3/CuO ceramics as solar receiver materials. The results show that adding and increasing the content of CuO can transform alumina into a solar absorber material with high absorptivity in the UV-VIS-NIR spectrum. Thermal stress analysis demonstrates outstanding stress durability and uniform heat distribution in the different ceramics. Therefore, black Al2O3/CuO ceramics can be considered ideal solar absorber materials with high sustainability and durability at high temperatures.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Coatings & Films
Z. Abdel Hamid, Mona H. Gomaa, Soliman I. El-Hout, Emad M. M. Ewais
Summary: The highly active heterogeneous alpha-Fe2O3/Fe3O4@GO composite was incorporated into electroless Ni-P thin film to enhance its performance. The composite was thoroughly characterized and found to have uniform distribution of alpha-Fe2O3/Fe3O4 nanoparticles on GO sheets. The Ni-P/alpha-Fe2O3/Fe3O4@GO composite coatings exhibited improved corrosion resistance in a 3.5% NaCl solution, with maximum resistance achieved at a dosage of 50 mgl-1 of alpha-Fe2O3/Fe3O4@GO nanosheets. SEM images showed that the nanosheets were implanted in the Ni-P matrix and evenly dispersed over the coated surface, while also enhancing the mechanical properties of the thin film.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
I. M. I. Bayoumi, A. A. M. El-Amir, S. A. El-korashy, N. H. Shalaby, E. M. M. Ewais
Summary: In this study, low-cement alumina-zirconia-silica matrices with excellent high-temperature strength were successfully produced using demolished industrial trash from glass melting furnaces. The experimental mixture with an Al2O3/SiO2 ratio of 3 showed the best performance at 1375 degrees Celsius. It can be considered as a potential matrix for synthesizing low-cement refractory castables.
REFRACTORIES AND INDUSTRIAL CERAMICS
(2022)
Article
Materials Science, Ceramics
Dina H. A. Besisa, Emad M. M. Ewais, Yasser M. Z. Ahmed
Summary: The study compared ZrO2/Fe2O3 and Al2O3/CuO ceramics as high temperature solar absorber materials, finding that Al2O3/CuO composites have superior performance at a lower cost, potentially identifying them as promising materials for high-temperature solar absorption.
CERAMICS INTERNATIONAL
(2021)
