Mechanical, dielectric properties and thermal shock resistance of porous Si2N2O/Si3N4 composite ceramics
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초록
Porous Si2N2O/Si3N4 composite ceramics were fabricated by gas pressure sintering of Si3N4 and SiO2 with Sm2O3 as sinteringadditive under N2 atmosphere. Porosity and β-Si3N4 phase of the composites are increased with the increasing α-Si3N4 contentin starting materials. The composite ceramics show high flexural strength (223 ~ 288 MPa at room temperature) and goodthermal shock resistance and the critical thermal shock temperature (ΔTc) could be up to 1100 oC. The dielectric propertiesare mainly influenced by the sample porosity and phase composition. The as-prepared Si2N2O / Si3N4 composite ceramicspossess both low dielectric constant (ε = 4.8-5.2) and loss tangent (tanδ = 0.0014-0.0063), combined with excellent mechanicalperformance and thermal shock resistance, showing Si2N2O/Si3N4 composite ceramics could be promising high-temperaturewave transparent materials.
Abstract
Porous Si2N2O/Si3N4 composite ceramics were fabricated by gas pressure sintering of Si3N4 and SiO2 with Sm2O3 as sinteringadditive under N2 atmosphere. Porosity and β-Si3N4 phase of the composites are increased with the increasing α-Si3N4 contentin starting materials. The composite ceramics show high flexural strength (223 ~ 288 MPa at room temperature) and goodthermal shock resistance and the critical thermal shock temperature (ΔTc) could be up to 1100 oC. The dielectric propertiesare mainly influenced by the sample porosity and phase composition. The as-prepared Si2N2O / Si3N4 composite ceramicspossess both low dielectric constant (ε = 4.8-5.2) and loss tangent (tanδ = 0.0014-0.0063), combined with excellent mechanicalperformance and thermal shock resistance, showing Si2N2O/Si3N4 composite ceramics could be promising high-temperaturewave transparent materials.
참고문헌 (15)
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