f/BN、BNf/SiBN和BNf/Si3N4纖維束復合材料,研究了BN纖維束及三種纖維束復合材料的微結(jié)構(gòu)、拉伸性能和介電性能。結(jié)果顯示,BN纖維是由晶化程度較低的h-BN組成,其相結(jié)構(gòu)在制備溫度下未發(fā)生變化。纖維的表面存在大量50-500nm的微孔缺陷。800 oC處理后纖維束的平均拉伸強度為94MPa。BNf/BN、BNf/SiBN以及BNf/Si3N4拉伸強度依次降低,平均值分別為68.8 MPa、30.6 MPa、26.2MPa,斷裂模式均為脆性斷裂。原因在于：纖維損傷隨制備溫度升高而加??；纖維/基體模量失配,纖維不能有效承載；界面結(jié)合強度過高,裂紋不能有效偏轉(zhuǎn)。三種纖維束復合材料的介電常數(shù)實部ε’<3.0,介電損耗tanδ<0.04,電磁透波性能良好,其中BNf/BN復合材料具有最佳的綜合性能。"/>

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BN纖維束增強氮化物復合材料的制備與性能
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西北工業(yè)大學,西北工業(yè)大學,西北工業(yè)大學,西北工業(yè)大學,西北工業(yè)大學,山東工業(yè)陶瓷設(shè)計研究院

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國家自然科學基金資助(項目號51472201,51602258)


Preparation and Properties of BN Fiber Reinforced Nitride Mini-composites
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Northwestern Polytechnical University,,,,,

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    摘要:

    采用低壓化學氣相沉積/滲透法(LPCVD/CVI)制備了BNf/BN、BNf/SiBN和BNf/Si3N4纖維束復合材料,研究了BN纖維束及三種纖維束復合材料的微結(jié)構(gòu)、拉伸性能和介電性能。結(jié)果顯示,BN纖維是由晶化程度較低的h-BN組成,其相結(jié)構(gòu)在制備溫度下未發(fā)生變化。纖維的表面存在大量50-500nm的微孔缺陷。800 oC處理后纖維束的平均拉伸強度為94MPa。BNf/BN、BNf/SiBN以及BNf/Si3N4拉伸強度依次降低,平均值分別為68.8 MPa、30.6 MPa、26.2MPa,斷裂模式均為脆性斷裂。原因在于：纖維損傷隨制備溫度升高而加??；纖維/基體模量失配,纖維不能有效承載；界面結(jié)合強度過高,裂紋不能有效偏轉(zhuǎn)。三種纖維束復合材料的介電常數(shù)實部ε’<3.0,介電損耗tanδ<0.04,電磁透波性能良好,其中BNf/BN復合材料具有最佳的綜合性能。

    Abstract:

    BNf/BN, BNf/SiBN and BNf/Si3N4 mini-composites were fabricated by Low pressure chemical vapor deposition/infiltration (LPCVD/CVI) process. The microstructure, tensile property and dielectric property of BN fiber bundle and these three mini-composites were investigated. Results indicated that BN fiber composed of h-BN with low crystallinity, phase structure of which unchanged after heat treatment at 650 oC and 800 oC. Amounts of micro pores with size of 50-500nm exist on the surface of BN fiber. Mean tensile strength of BN fiber bundle heat treated at 800 oC is 94 MPa. Average tensile strength of BNf/BN, BNf/SiBN and BNf/Si3N4 mini-composites were 68.8 MPa, 30.6 MPa and 26.2 MPa, respectively. Three mini-composites all exhibited brittle fracture behavior, owing to the modulus mismatch between fiber and matrix and strong interphase bond strength. Cracks cannot be effectively deflected and fibers cannot bear the load effectively. Real part of dielectric constant and dielectric loss were lower than 3 and 0.04, respectively, indicating good Electromagnetic wave transmitting property. BNf/BN possessed the best comprehensive performance.

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李建平,成來飛,葉昉,程贊粼,劉永勝,張銘霞. BN纖維束增強氮化物復合材料的制備與性能[J].稀有金屬材料與工程,2018,47(9):2901~2908.[Li Jianping, Cheng Laifei, Ye Fang, Cheng Zanlin, Liu Yongsheng, Zhang Mingxia. Preparation and Properties of BN Fiber Reinforced Nitride Mini-composites[J]. Rare Metal Materials and Engineering,2018,47(9):2901~2908.]
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  • 收稿日期:2018-03-21
  • 最后修改日期:2018-05-18
  • 錄用日期:2018-05-21
  • 在線發(fā)布日期: 2018-11-01
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