连续纤维增韧陶瓷基复合材料声学参量评价均匀性方法研究

发布时间：2018-07-06 20:52

本文选题：连续纤维增韧陶瓷基复合材料 + 穿透法　；参考：《玻璃钢/复合材料》2016年06期

【摘要】：连续纤维增韧陶瓷基复合材料具有优良的超高温性能,是航空航天领域高温构件的新型材料,近年来已进入实际使用阶段。研究该材料的无损检测方法对制备过程参数优化、成品质量控制及材料性能表征等都具有很大意义。分析连续纤维增韧陶瓷基复合材料的制作方式和材料特性,发现该材料具有高衰减的特性,对传统复合材料超声检测方法进行改进,采用穿透法准确了解该材料的声学特性,对声速、声衰减等参量进行测量并对数据进行成像,选择"声速值"与"幅值灰度图"的变异系数这两个指标,作为表征材料均匀性的指标。实验结果表明,声速表征的密度均匀性与声衰减表征的孔隙均匀性结果一致,说明材料的密度不均匀是由孔隙不均造成的,最终实现控制材料孔隙率以控制材料质量。
[Abstract]:Continuous fiber toughened ceramic matrix composites have excellent ultra-high temperature properties. They are new materials of high temperature components in aerospace field and have entered the practical stage in recent years. The study of the nondestructive testing method is of great significance to the optimization of the process parameters, the quality control of the finished products and the characterization of the properties of the materials. By analyzing the fabrication method and material characteristics of continuous fiber toughened ceramic matrix composite, it is found that the material has the characteristics of high attenuation. The ultrasonic testing method of the traditional composite is improved, and the acoustic characteristics of the material are accurately understood by the penetration method. The parameters such as sound velocity and sound attenuation are measured and the data are imaged. The coefficient of variation of "sound velocity" and "amplitude gray image" are selected as indicators to characterize the homogeneity of materials. The experimental results show that the density uniformity of sound velocity is consistent with that of sound attenuation, which indicates that the density inhomogeneity of materials is caused by uneven porosity, and the porosity of materials is controlled to control the quality of materials.
【作者单位】：南昌航空大学无损检测技术教育部重点实验室;
【分类号】：TB332

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