Interfacial Behavior and Its Effect on Mechanical Properties of Cf/SiC Composite/TiAl6V4 Joint Brazed with TiZrCuNi
Interfacial Behavior and Its Effect on Mechanical Properties of Cf/SiC Composite/TiAl6V4 Joint Brazed with TiZrCuNi
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DOI：
10.1007/s11665-017-2571-4
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发表时间：
2017-02
影响因子：
2.3
通讯作者：
Dongyu Fan;Jihua Huang;B. Cui;Jian Yang;Shuhai Chen;Xingke Zhao
中科院分区：
文献类型：
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作者：
Dongyu Fan;Jihua Huang;B. Cui;Jian Yang;Shuhai Chen;Xingke Zhao
为了表征钎焊接头的界面行为，为TiZrCuNi基复合填料的应用提供理论依据，本文采用TiZrCuNi钎料对Cf/SiC复合材料与TC4进行钎焊，系统研究了钎焊接头的显微组织随温度和保温时间的变化。对钎焊接头的机械性能进行了测量和分析。结果表明，Ti(Zr)C、Ti5Si3、Ti2Cu、TiNi、TiZrCu2、Ti2(Cu,Ni)和Ti(s,s)是接头中的主要化合物。钎焊温度对接头显微组织有明显影响：随着钎焊温度的升高，钎焊接头组织由四部分减少为三部分，波状反应层变得连续且变厚。而保温时间对显微组织也有类似但较弱的影响：随着保温时间的延长，反应层变厚，但很难引起接头结构部分的减少。反应层的厚度决定了接头的力学性能。研究结果有利于增强相的选择和复合填料的设计以获得更好的机械性能。当钎焊温度为940℃、保温时间为25min时，钎焊接头的最大剪切强度达到143.2MPa。
In order to characterize the interfacial behavior of brazed joints and offer theoretical basis for the applications of TiZrCuNi-based composite fillers, Cf/SiC composite and TC4 were brazed by TiZrCuNi filler, and the microstructures of joints versus temperature and versus holding time were systematically studied in this paper. The mechanical properties of brazed joints were measured and analyzed. The results showed that Ti(Zr)C, Ti5Si3, Ti2Cu, TiNi, TiZrCu2, Ti2(Cu,Ni) and Ti(s,s) were the predominant compounds in the joints. Brazing temperature had a distinct effect on the microstructures of joints: with the increase of brazing temperature, the structure of brazed joints was reduced from four parts to three parts, and the wavy reaction layer became continuous and much thicker. While holding time had a similar but weaker effect on microstructures: with the extension of holding time, the reaction layer became thicker, but it was difficult to induce the decrease in the structural parts of joint. The thickness of reaction layer determined the mechanical properties of joints. The results were beneficial for the selection of reinforced phases and the design of composite fillers to obtain better mechanical performances. When the brazing temperature was 940 °C and the holding time was 25 min, the maximum shear strength of brazed joints attained a value of 143.2 MPa.