Journal ArticleDOI
Microstructure and Mechanical Properties of Lu2O3-Doped Porous Silicon Nitride Ceramics Using Phenolic Resin as Pore-Forming Agent
TLDR
In this article, a joint process consisting of pressureless sintering and chemical vapor infiltration (CVI) was developed to prepare porous Si3N4 ceramics with controlled microstructure.Abstract:
The joint process consisting of pressureless sintering and chemical vapor infiltration (CVI) was developed to prepare porous Si3N4 ceramics with controlled microstructure. Lu2O3 and phenolic resin acted as sintering aid and pore-forming agent, respectively. The 5 wt% Lu2O3-doped ceramics using 12–57 vol% phenolic resin attained a porosity ranging from 46% to 53%. With increasing the resin content, the average pore size increased from 1 to 2 μm. The porous ceramic infiltrated with CVI Si3N4 had an improved microstructure. The decreased pore size and porosity led to an increase in flexural strength, and the densified surface led to an improved surface hardness.read more
Citations
More filters
Journal ArticleDOI
Macro-porous ceramics: processing and properties
Tatsuki Ohji,Manabu Fukushima +1 more
TL;DR: Porous ceramics are now expected to be used for a wide variety of industrial applications from filtration, absorption, catalysts, and catalyst supports to lightweight structural components as mentioned in this paper.
Journal ArticleDOI
Electromagnetic properties of Si–C–N based ceramics and composites
TL;DR: Besides the excellent high-temperature mechanical properties, Si3N4 and SiC based ceramics containing insulating or electrically conductive phase are attractive for their tunable dielectric propert...
Journal ArticleDOI
In-situ synthesis of hierarchically porous and polycrystalline carbon nanowires with excellent microwave absorption performance
TL;DR: In this article, a carbon nanowire reinforced Si 3 N 4 composite ceramics (CNW/Si 3 N4 ) have been prepared by catalytic chemical vapor deposition.
Journal ArticleDOI
Dielectric properties of Si3N4–SiCN composite ceramics in X-band
Quan Li,Xiaowei Yin,Liyun Feng +2 more
TL;DR: In this article, the phase composition of SiCN ceramics, electrical conductivity and dielectric properties of Si3N4-SiCN composite Ceramics over the frequency range of 8.2-12.4 GHz (X-band) were investigated.
Journal ArticleDOI
Complex Permittivity and Microwave Absorbing Property of Si3N4{SiC Composite Ceramic
TL;DR: In this article, the relationship between SiC content and relative complex permittivity of Si3N4-SiC within the frequency range of 8.2-12.4 GHz (X-band) was investigated.
References
More filters
Journal ArticleDOI
Silicon Nitride and Related Materials
TL;DR: Silicon nitride has been researched intensively, largely in response to the challenge to develop internal combustion engines with hot-zone components made entirely from ceramics as mentioned in this paper, but this research effort has succeeded in generating a degree of understanding of silicon nitride and of its processing and properties.
Journal ArticleDOI
Characterisation of porous silicon nitride materials produced with starch
A. Díaz,Stuart Hampshire +1 more
TL;DR: In this article, the authors describe the fabrication of porous silicon nitride ceramic materials using a fugitive additive, corn starch, which allows samples to be produced with different volume fractions of porosity from ∼0 to 0.25.
Journal ArticleDOI
Microstructure and Properties of Self-Reinforced Silicon Nitride
TL;DR: In this paper, a self-reinforced Si[sub 3]N[sub 4]-Y[sub 2]O [sub 3]-MgO ratios ranging from 3:1 to 1:2, CaO contents ranging from 0.1 to 0.5 wt%, and Si[ sub 3] N[sub [sub 4] contents between 90 and 96 wt%.
Journal ArticleDOI
Fabrication and characterisation of porous silicon nitride ceramics using Yb2O3 as sintering additive
TL;DR: In this article, the microstructure and mechanical properties of porous Si 3 N 4 ceramics were investigated, as a function of porosity, and a high porosity was obtained by adjusting the additive content.
Journal ArticleDOI
Relationship between Microstructure, Toughening Mechanisms, and Fracture Toughness of Reinforced Silicon Nitride Ceramics
TL;DR: In this article, pull-out and elastic bridging were most frequently observed as the toughening mechanisms in samples with fine-grained microstructures having needlelike {beta}-Si{sub 3}N{sub 4} grains with diameters of 1 microm.