Preparation and performance of Si3N4 hollow microspheres by template method and carbothermal reduction nitridation.

Silicon nitride (Si3N4) hollow microspheres with smaller particle size and narrower distribution can be used to prepare closed-cell ceramics as pore-forming agent to improve the heat insulation performance and wave-transparent performance of porous Si3N4 ceramics. In this work, Si3N4 hollow microspheres with a diameter of about 1 μm and a wall thickness of approximately 150 nm were prepared by template method combined with carbothermal reduction nitridation (CRN) method. The optimum preparation temperature of the Si3N4 hollow microspheres is 1450 °C. The morphology, microstructure and phase composition of the prepared Si3N4 hollow microspheres were characterized. The formation mechanism of the Si3N4 hollow microspheres was discussed. The dielectric properties of Si3N4 hollow microspheres were measured using the waveguide method at 8.2~12.4 GHz. The results show that the wave-transparent performance of the Si3N4 hollow microspheres is similar to those of α-Si3N4 particles. It can be used as pore-forming agent or matrix for preparing porous Si3N4 ceramics with lightweight, heat insulating, wave-transparent and high-strength.

[1]  Y. Mei,et al.  Formation of Si Hollow Structures as Promising Anode Materials through Reduction of Silica in AlCl3-NaCl Molten Salt. , 2018, ACS nano.

[2]  Hejun Li,et al.  Vertically Grown Edge‐Rich Graphene Nanosheets for Spatial Control of Li Nucleation , 2018 .

[3]  Zhaochen Li,et al.  Tunable dielectric properties of mesoporous carbon hollow microspheres via textural properties , 2018, Nanotechnology.

[4]  Siyuan Sun,et al.  Carbothermal synthesis of micron-sized β-Si3N4 with tailored morphology , 2017 .

[5]  Yiyao Ge,et al.  Synthesis and growth mechanism of approximate spherical β‐Si3N4 particles via carbothermal reduction‐nitridation method , 2017 .

[6]  D. Zhao,et al.  Intricate Hollow Structures: Controlled Synthesis and Applications in Energy Storage and Conversion , 2017, Advanced materials.

[7]  Jinlong Yang,et al.  In-situ reaction synthesis of porous Si2N2O-Si3N4 multiphase ceramics with low dielectric constant via silica poly-hollow microspheres , 2017 .

[8]  Lai-fei Cheng,et al.  Carbon Hollow Microspheres with a Designable Mesoporous Shell for High-Performance Electromagnetic Wave Absorption. , 2017, ACS applied materials & interfaces.

[9]  Kun Liu,et al.  Fabrication and properties of porous silicon nitride wave-transparent ceramics via gel-casting and pressureless sintering , 2016 .

[10]  Jinlong Yang,et al.  Preparation of porous Si3N4 ceramics via tailoring solid loading of Si3N4 slurry and Si3N4 poly-hollow microsphere content , 2015, Journal of Advanced Ceramics.

[11]  Chen-Gui Lu,et al.  Preparation of Silicon Nitride Hollow Quasi‐Spheres by RF Thermal Plasma , 2015 .

[12]  Dong Seok Kim,et al.  Hierarchical Structure of Porous Silicon Nitride Ceramics with Aligned Pore Channels Prepared by Ice-Templating and Nitridation of Silicon Powder , 2015 .

[13]  Jinlong Yang,et al.  Pore morphology designs of porous Si3N4-based ceramics using Si3N4 and Al2O3 poly-hollow microspheres as pore-forming agents , 2015 .

[14]  Hongjie Wang,et al.  Porous Si3N4 Ceramics Prepared by TBA-based Gel-casting , 2015 .

[15]  Yuping Zeng,et al.  High-strength porous Si3N4 ceramics prepared by freeze casting and silicon powder nitridation process , 2014 .

[16]  Lai-fei Cheng,et al.  Electromagnetic properties of Si–C–N based ceramics and composites , 2014 .

[17]  Jinlong Yang,et al.  Novel porous Si3N4 ceramics prepared by aqueous gelcasting using Si3N4 poly-hollow microspheres as pore-forming agent , 2014 .

[18]  Zhihua Yang,et al.  Effects of pore size on microstructure, mechanical and dielectric properties of gel casting BN/Si3N4 ceramics with spherical-shaped pore structures , 2013 .

[19]  R. Janssen,et al.  Mechanical characterization of highly porous β-Si3N4 ceramics fabricated via partial sintering & starch addition , 2013 .

[20]  B. Li,et al.  Microstructure and properties of porous silicon nitride ceramics prepared by gel-casting and gas pressure sintering , 2013 .

[21]  Zhihua Yang,et al.  Mechanical and dielectric properties of gelcasted Si3N4 porous ceramic using CaHPO4 as an additive , 2012 .

[22]  Jinlong Yang,et al.  Pore structure control of Si3N4 ceramics based on particle-stabilized foams , 2012, Journal of Porous Materials.

[23]  Hongjie Wang,et al.  Porous Si3N4 Fabricated by Phase Separation Method Using Benzoic Acid as Pore-Forming Agent , 2011 .

[24]  X. Xi,et al.  Study on particle-stabilized Si3N4 ceramic foams , 2011 .

[25]  Jian Zhang,et al.  Gelcasting preparation of porous silicon nitride ceramics by adjusting the content of monomers , 2010 .

[26]  P. Yan,et al.  Si3N4 nano-microsphere synthesized by cathode arc plasma and heat treatment , 2009 .

[27]  A. O. Kurt,et al.  Synthesizing high α-phase Si3N4 powders containing sintering additives , 2009 .

[28]  Branko Matović,et al.  Dense and near-net-shape fabrication of Si3N4 ceramics , 2009 .

[29]  A. Ortega,et al.  Carbothermal synthesis of silicon nitride (Si3N4) : Kinetics and diffusion mechanism , 2008 .

[30]  Yuping Zeng,et al.  Oxidation bonding of porous silicon nitride ceramics with high strength and low dielectric constant , 2007 .

[31]  S. Hampshire,et al.  Characterisation of porous silicon nitride materials produced with starch , 2004 .

[32]  H. Arik.  Synthesis of Si3N4 by the carbo-thermal reduction and nitridation of diatomite , 2003 .

[33]  B. Forslund,et al.  Reactions within quartz-carbon mixtures in a nitrogen atmosphere , 1992 .

[34]  J. A. Charles,et al.  Synthesis of nitrogen ceramic povvders by carbothermal reduction and nitridation Part 1 Silicon nitride , 1991 .

[35]  R. Drew,et al.  Carbothermal Synthesis of Silicon Nitride: Effect of Reaction Conditions , 1991 .

[36]  W. Stöber,et al.  Controlled growth of monodisperse silica spheres in the micron size range , 1968 .