Dip-coating of boron nitride interphase and its effects on mechanical properties of SiCf/SiC composites
Dip-coating of boron nitride interphase and its effects on mechanical properties of SiCf/SiC composites
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DOI：
10.1016/j.msea.2012.01.118
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发表时间：
2012-05
期刊：
影响因子：
6.4
通讯作者：
D. Ding;Wan-cheng Zhou;F. Luo;Malin Chen;Dongmei Zhu
中科院分区：
文献类型：
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作者：
D. Ding;Wan-cheng Zhou;F. Luo;Malin Chen;Dongmei Zhu
采用硼酸和尿素溶液浸渍法在KD-1 SiC纤维上制备了氮化硼（BN）涂层，并在1000°C氮气气氛中进行了热处理。扫描电子显微镜（SEM）分析表明，BN涂层表面光滑。XRD和拉曼光谱结果表明，涂层的成分为h-BN。研究了BN界面对2.5D SiC纤维增强CVI-SiC基（SiC/SiC）复合材料力学性能的影响。结果表明，有BN界面的SiCf/SiC复合材料的抗弯强度为170 MPa，无BN界面的SiCf/SiC复合材料的抗弯强度为60 MPa。与无界面相的复合材料相比，含BN界面相的SiCf/SiC复合材料具有明显的增韧断裂行为。结果表明，BN界面相的浸涂可以有效地调节SiCf/SiC复合材料的界面结合强度，提高复合材料的力学性能。
Boron nitride (BN) coatings were successfully synthesized on KD-1 SiC fibers by dip-coating in boric acid and urea solution followed by heat treatment at 1000°C in nitrogen. The SEM micrographs indicated that the BN coating is smooth. The XRD and Raman spectrum results showed that the composition of the coatings is h-BN. The effects of BN interphase on the mechanical properties of 2.5D SiC fiber reinforced CVI-SiC matrix (SiC/SiC) composites were investigated. The results show that the flexural strength of SiCf/SiC composites with and without BN interphase is 170MPa and 60MPa, respectively. And, compared to composites without interphase, the SiCf/SiC composites with BN interphase exhibit an obvious toughened fracture behavior. It is indicated that dip-coating BN interphase can effectively adjust the interfacial bonding strength and improve the mechanical properties of SiCf/SiC composites.