FABRICATION AND PROPERTIES OF HIGH DAMPING WOODCERAMICS/MB15 COMPOSITE
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摘要: 由于高阻尼材料在防震减噪结构中有广泛的应用,为了获得阻尼性能和力学性能俱佳的材料,以木质陶瓷为浸渍载体用高温浸渍设备制备了木质陶瓷/MB15(以下简写为WCMs/MB15)复合材料,并对其微观结构、力学性能以及阻尼行为进行了研究。结果表明,WCMs/MB15复合材料浸渍效果良好,组织均匀且三维网络互穿结构明显,各项力学性能指标均明显提高。断口分析表明断裂机制为混合断裂。同时,复合材料的阻尼性能在木质陶瓷的基础上进一步改善并且随温度的升高而增加,随频率的增加而降低。组成相的阻尼以及位错阻尼可能是复合材料的室温阻尼机制,而高温阻尼机制以界面阻尼为主。
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关键词:
- 木质陶瓷 /
- 网络互穿结构复合材料 /
- 真空压力浸渍 /
- 力学性能 /
- 阻尼行为
Abstract: Because high damping characteristics of materials are useful in the passive attenuation of noise and vibration in structures, and for the purpose of getting good mechanical properties and good damping properties simultaneously, a woodceramics/MB15 (WCMs/MB15 hereafter) composite was fabricated using the high-pressure infiltration system. Microstructural analysis as well as measurement of mechanical properties and damping behavior of WCMs/MB15 composite was made. Experimental results show that the MB15 has infiltrated most of the pores and the WCMs/MB15 composite has an obvious interpenetrating network structure. Its strengths and elastic moduli are much higher than those of unreinforced woodceramics. Damping value of the WCMs/MB15 composite improves based on that of woodceramics and increase with the testing temperature. The intrinsic damping of woodceramics and dislocation damping in the matrix are supposed to be the main contributor of the damping of WCMs/MB15 composite at room temperature while interface damping is likely to be responsible for the majority at elevated temperatures.
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