Article
Materials Science, Ceramics
Jian Ye, Biao Zhang, Haoqian Zhang, Zhaoxin Zhong, Yang Wang, Qiang Liu, Feng Ye
Summary: A novel porosity gradient structure is proposed to solve the shortcomings of traditional layered structure for broadband wave-transmitting applications. The key to design and fabrication lies in the precise turning of the relative permittivity of each layer and their simultaneous shrinkage during sintering. Different porosity porous BN/Si3N4 composites were prepared and exhibited low and similar shrinkage after sintering at 1900 degrees C. Moreover, the composites with different porosities showed excellent mechanical properties.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Jimei Xue, Fangyuan Ren, Yongpeng Dong, Hanjun Wei, Fan Yang, Laifei Cheng
Summary: SiCN-based ceramics with broadband and strong microwave absorption properties exhibit outstanding electromagnetic wave absorption performance through the unique hetero-interface of Si3N4-BN, Si3N4-SiCN, and BN-SiCN in the ceramics synthesized using the CVI method. This leads to an effective absorption bandwidth covering the entire X-band.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Hong Lin, Guoqing Feng, Hongyu Wang, Haiyi Peng, Liangliang Cao, Huixing Lin, Hongtao Li, Fancheng Meng
Summary: This study explores the effects of BN addition on the mechanical and electrical properties of oxidative sintered Si3N4-BN composites. The results show that an appropriate amount of BN content can improve the densification, volume density, mechanical properties, and dielectric constant of the composite material, while excessive BN addition can increase the porosity and decrease the dielectric performance.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Nan Meng, Chidong Liu, Fang Ye, Laifei Cheng, Jie Zhou, Mingxing Li, Shenghao Li, Xuefeng Cui
Summary: The fabrication and characterization of Si3N4 fiber-reinforced BN/Si3N4 composites with BN interphase through PIP process were reported. The effects of heating rate on mechanical and dielectric properties were analyzed. The composites exhibited optimal performance when the heating rate was 5 °C/min, with flexural strength and fracture toughness reaching 138 MPa and 5.7 MPa m1/2, respectively.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
Hande Marulcuoglu, Ferhat Kara
Summary: Complex shaped dense Si3N4 ceramics were successfully produced by direct coagulation casting technique and gas pressure sintering. The mechanical reliability of the ceramics was improved by adjusting the solid content and applying additional cold isostatic pressing.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Ceramics
A. H. Kouchaki Foroshani, A. Faeghinia, S. Seyed Afghahi, S. A. Tayebifard, A. Sedaghat Ahangri Hossein Zadeh
Summary: This study investigated the effect of Eu2O3 on the mechanical and dielectric properties of Si3N4-SiO2 composites. The addition of Eu2O3 reduced the flexural strength and increased the grain size and β phase concentration. With increasing mass fraction of Eu2O3, the average dielectric constant and dielectric loss of the samples also increased.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Farhood Heidari, Seyyed Salman Seyyed Afghahi, Ehsan Mohammadi, Mohammad Bahri, Ali Asghar Ebrahimi Valmoozi
Summary: By using good thermomechanical and electromagnetic properties of silicon nitride (Si3N4), barium aluminosilicate (BaO-BaTiO3-SiO2 or BAS), and boron nitride (BN), a novel combination of Si3N4/BAS/BN composite was successfully fabricated via spark plasma sintering (SPS) after traditional powder mixing process. The effect of different amounts of BN (3-9 wt%) on the mechanical properties of the composite was investigated. The optimal sample, containing 3 wt% of BN and sintered under a final pressure of 50 MPa, exhibited excellent mechanical properties and low loss tangent in the X-band frequencies range. The optimal sample thickness was determined considering the mechanical strength limits using the Nicolson-Ross-Weir (NRW) technique.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
U. O. Uyor, A. P. Popoola, O. M. Popoola, V. S. Aigbodion
Summary: Research attention has been focused on developing polypropylene (PP) based materials with large dielectric constant, mechanical strength, and thermal stability. By using sandwich-structured nanoparticles and compatibilizer, this study successfully enhanced the DSC properties and thermal stability of PP nanocomposites. The addition of functionalized nanoparticles and compatibilizer significantly improved the performance of PP composites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Yuangao Yan, Xuan Fei, Liuying Huang, Yuxi Yu, Yichen Wen, Gang Zhao
Summary: Hexagonal boron nitride (h-BN) is successfully incorporated into polymer-derived SiCN ceramics, improving their mechanical properties and reducing dielectric loss. The presence of BN reduces the number of pores and prevents crack expansion, leading to enhanced mechanical strength. Additionally, BN weakens the polarization relaxation behavior, resulting in lower dielectric loss.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Nanoscience & Nanotechnology
Xirui Yan, Kai Zhao, Kewei Xie, Mengxia Han, Guiliang Liu, Xiangfa Liu
Summary: Si3N4 particles were successfully added into 2026 Al Alloy using Al-Si-N master alloy, and Si3N4/2026 Al composite was prepared via gravity casting and hot extrusion process. The distribution of Si3N4 particles in the composite changed from grain boundary to chain structure after hot extrusion. The TEM results showed the presence of a nano-AlN particles transition layer on the surface of Si3N4 particles, leading to good interfacial bonding with the Al matrix. The mechanical properties of the composite were significantly improved due to the load-bearing effect of Si3N4 particles, grain boundary strengthening, dislocation strengthening, and Orowan strengthening.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Zhiqiang He, Ze Wang, Dezhi Wang, Xinli Liu, Bohua Duan
Summary: Porous NiTi alloys were successfully manufactured through the integration of gel-casting and microwave sintering techniques. The study demonstrated that increasing the sintering temperature resulted in a decrease in porosity and mean pore diameter, while increasing the content of the NiTi phase, the elastic modulus, and compressive strength of the sintered samples. Porous NiTi alloys with desirable properties were obtained when the gel body with 50 vol.% solid loading was microwave sintered at 1000 degrees C for 30 min.
Article
Materials Science, Ceramics
Xiaole Yang, Yuanbing Li, Hehan Xie, Xianfeng Yang, Zhe Zhou
Summary: This study investigated the electrokinetic and gel behavior of Si3N4 aqueous suspension for gel casting, focusing on the zeta potential, gel time, and viscosity influenced by organic binders. The results showed that pH, organic binders, and solid loading play significant roles in determining the properties of the slurry.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Guandong Liang, Jianqiang Bi, Linjing Qiao, Zhuangzhuang Yin, Shaoyin Wang
Summary: The gel-casting process was successfully applied to porous Si3N4 wave-absorbing composites in order to address the lack of suitable conformal, load-bearing, light-weight, and high temperature-resistant integrated wave-absorbing composites for complex conditions. A universal low-slurry for gel casting was prepared by using two dispersants acting together, ensuring the smooth completion of the gel casting process. Reasonable parameters of the rubber discharge process were given to avoid the problem of the green body swelling and cracking, resulting in the successful preparation of porous TiC/Si3N4 composites.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Jie Zhou, Fang Ye, Laifei Cheng, Mingxing Li, Xuefeng Cui, Zhiqiang Fu, Litong Zhang, Nan Chai
Summary: In this study, three-dimensional silicon nitride fiber-reinforced silicon nitride matrix composites with a boron nitride interphase were fabricated through precursor infiltration and pyrolysis process. The thermal stability of the composites was analyzed by heat treatment at 1000-1200 degrees C, showing changes in flexural strength and fracture toughness with a pattern of decrease followed by increase. The influence mechanisms of heat treatment on the composites include matrix shrinkage, defects formation, and improved interfacial bonding strength.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Correction
Materials Science, Multidisciplinary
Saeed Pashmforoosh, Sadegh Shahriyari, Omid Mirzaee
Summary: The affiliation of the third author was published incorrectly in the original article and has now been corrected.
METALS AND MATERIALS INTERNATIONAL
(2021)
