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  

STUDY ON EVALUATION UNIFORMITY METHOD OF CONTINUOUS FIBER-REINFORCED CERAMIC COMPOSITES BY ACOUSTIC PARAMETER

作　　者：陆铭慧[1] 段涵呓 

机构地区：[1]南昌航空大学无损检测技术教育部重点实验室,南昌330063

出　　处：《玻璃钢／复合材料》2016年第6期37-43,共7页Fiber Reinforced Plastics/Composites

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。Continuous fiber-reinforced ceramic composites（ CFCC） have excellent properties at high temperature,which is a new type of high temperature components in aerospace field,and has entered the actual use stage in recent years. It is of great significance to study the parameter control in the preparation process,the quality of the product and optimization and the characterization of the material properties. Analysis of production methods and material properties of CFCC shows that this material has coarse grain and high attenuation characteristics. So original ultrasonic method was modified to transmission method to get an accurate understanding of the acoustic characteristics of the material. The measurement of sound velocity,sound attenuation and other parameters was carried out by image. And,the coefficient of variation of ＂sound＂ and ＂amplitude gray-scale map＂ were selected as two indicators to characterize the uniformity of the material. The results show that velocity uniformity caused by density and acoustic attenuation uniformity caused by pore results are consistent,indicating that the uneven density of the material is caused by pore. Finally,control of the material quality could be realized through the control of the porosity in the material.

关 键 词：连续纤维增韧陶瓷基复合材料 穿透法 材料均匀性 变异系数 

分 类 号：TB332[一般工业技术—材料科学与工程]