Mechanical,dielectric and thermal properties of porous boron nitride/silicon oxynitride ceramic composites prepared by pressureless sintering |
| |
| Affiliation: | 1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, Heilongjiang 150001, China;2. Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150080, China;1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. School of Materials Science and Engineering, The University of New South Wales, Sydney 2052, Australia;1. Institute for Advanced Ceramics, Harbin Institute of Technology, Harbin 150001, China;2. School of Energy Science and Technology, Harbin Institute of Technology, Harbin 150001, China;1. Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 040 01 Ko?ice, Slovakia;2. Bay Zoltan Nonprofit Ltd for Applied Research, Institute for Materials Science and Technology, Budapest, Hungary;1. Key Laboratory of Advanced Structural-Functional Integration Materials & Green Manufacturing Technology, Harbin Institute of Technology, Harbin, 150001, China;2. Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China;3. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, China |
| |
| Abstract: | Porous boron nitride/silicon oxynitride (BN/Si2N2O) composites were fabricated by pressureless sintering at 1650 °C with Li2O as sintering aid. The influence of Li2O and hexagonal boron nitride (h-BN) contents on phase, microstructure, mechanical, dielectric and thermal properties of the resulting porous BN/Si2N2O composites was investigated. Increasing Li2O content facilitated densification and decomposition of Si2N2O into Si3N4. The apparent porosity of the composites increases with the h-BN content increases and Si2N2O grain growth was restrained by the dispersed h-BN particles. The dielectric properties and thermal conductivities (TC) were affected mainly by porosity. Porous BN/Si2N2O ceramic composites with 4 mol% Li2O and 25 mol% BN exhibit both low dielectric constant (3.83) and dielectric loss tangent (0.008) with good mechanical and thermal performance, suggesting possible use as high-temperature structural/functional materials. |
| |
| Keywords: | Silicon oxynitride Boron nitride Composites Thermal conductivities |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
