| SiCf/SiO2复合材料的制备及界面层对其力学性能的影响 |
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| 引用本文： | 张标.SiCf/SiO2复合材料的制备及界面层对其力学性能的影响[J].精细化工,2010,27(11). |
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| 作者姓名： | 张标 |
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| 作者单位： | 西北工业大学,凝固技术国家重点实验室,陕西,西安,710072 |
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| 基金项目： | 凝固技术国家重点实验室(西北工业大学)自主研究课题资助项目 |
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| 摘 要： | 以碳化硅(SiC)纤维为增强体,采用真空浸渍法制备了2.5维连续SiC纤维增韧的SiO2基(SiCf/SiO2)复合材料,研究了SiC纤维编织体上不同的界面层对SiCf/SiO2复合材料力学性能的影响.化学气相渗透(CVI)法制备的热解碳(PyC)和PyC/SiC双层界面层分别使材料的抗弯强度由无界面层的52.2 MPa提高至67.4 MPa和180.3 MPa,但均使材料的韧性降低.用扫描电镜观察了材料的断口形貌,结果表明,PyC和PyC/SiC层不仅提高了材料的抗弯强度,而且增加了基体同纤维间的结合力,使基体有效地将载荷传递给纤维.PyC/SiC层能有效地保护SiC纤维,防止烧结过程中释放出的结晶水对纤维的损伤,有助于提高材料的力学性能.
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| 关 键 词： | SiC纤维 硅溶胶 真空浸渍 力学性能 界面层 功能材料 |
| 收稿时间： | 7/6/2010 12:00:00 AM |
| 修稿时间： | 2010/7/12 0:00:00 |
Fabrication of SiCf/SiO2 composites and the Influence of Interfaces on the mechanical properties |
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| ZHANG Biao.Fabrication of SiCf/SiO2 composites and the Influence of Interfaces on the mechanical properties[J].Fine Chemicals,2010,27(11). |
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| Authors: | ZHANG Biao |
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| Affiliation: | State Key Laboratory of Solidification Processing, Northwestern Polytechanical University |
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| Abstract: | 2.5-Dimension continuous silicon carbide fiber reinforced silicon dioxide composites(SiCf/SiO2) were fabricated by the vaccum infiltration.The effects of different interfaces on the SiC fabric preform of the mechanical properties in the composites were investigated.The bending strength of the composites,in which the fabric being without interface,was 52.2 MPa,while coating the fabric with pyrolytic carbon(PyC) and PyC/SiC multi-layer interfaces,the bending strength was increased to 67.4 MPa and 180.3 MPa.Ho... |
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| Keywords: | SiC fibers SiO2 sol vaccum infiltration mechanical property interface functional materials |
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