Design of reinforced interfacial structure in brazed joints of C/C composites and Nb by pre-oxidation surface treatment combined with in situ growth of CNTs
Design of reinforced interfacial structure in brazed joints of C/C composites and Nb by pre-oxidation surface treatment combined with in situ growth of CNTs
复制标题
预氧化表面处理结合CNT原位生长设计C/C复合材料与Nb钎焊接头的增强界面结构
DOI：
10.1016/j.carbon.2018.11.047
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发表时间：
2019-03
期刊：
影响因子：
10.9
通讯作者：
Wang D. P.
中科院分区：
文献类型：
--
作者：
Yang Z. W.;Wang C. L.;Han Y.;Zhao Y. T.;Wang Y.;Wang D. P.
采用预氧化处理和原位生长CNTs相结合的C/C复合材料表面改性方法，在Nb-C/C钎焊接头中形成增强的界面结构。研究了不同表面条件下C/C复合材料的界面结构及其对室温和高温下钎焊接头力学性能的影响。通过预氧化，碳纤维周围均匀形成大小可调的环形间隙，这些间隙为液态钎焊合金的渗透提供了人工通道。在800 ℃氧化5min后，Nb-C/C接头的抗剪强度由29 MPa提高到57 MPa。CNTs的生长有利于液态钎焊合金填充环隙，从而提高了材料的润湿性。此外，Ti与CNTs之间的反应形成了带有细小TiC颗粒的增强接头。经预氧化和碳纳米管生长后，钎焊接头的抗剪强度达到62 MPa，在500 ℃时保持在48 MPa 。C/C复合材料表面改性后接头抗剪强度的提高主要是由于残余应力的降低、结合面积的增大和钉钉效果的增强。
A surface modification method of C/C composites involving a combination of pre-oxidation treatment and in situ growth of CNTs was developed to form a reinforced interfacial structure in Nb-C/C brazed joints. The interfacial structure under different surface conditions of the C/C composites and its effects on the mechanical properties of brazed joints at both room temperature (RT) and elevated temperatures were studied. Through pre-oxidation, annular gaps with an adjustable size were uniformly formed around the carbon fibers, and these gaps acted as artificial channels for the liquid brazing alloy to infiltrate into. The RT shear strength of the Nb-C/C joints increased from 29 MPa to 57 MPa after oxidation of the C/C composites at 800 °C for 5min. The growth of CNTs was able to improve the wettability, since it was beneficial for liquid brazing alloy filling in the annular gaps. Further, a reinforced joint with fine TiC particles was formed by the reaction between Ti and the CNTs. The shear strength of the brazed joints reached 62 MPa after pre-oxidation and CNT growth and remained at 48 MPa at 500 °C. The improvement in the joint shear strength after surface modification of the C/C composites was attributed to the reduced residual stress, increased bonding area, and enhanced pinning effect.
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DOI：
10.1533/9780857096500.2.394
发表时间：
2013
期刊：
--
影响因子：
--
作者：
T. Ikeshoji
通讯作者：
T. Ikeshoji
原位消耗过量的Ti元素并形成细小的Ti基化合物作为增强C/C-TC4接头的增强材料
影响因子：
4
作者：
Ba Jin;Wang Yiheng;Liu Yulin;Lin Jinghuang;Qi Junlei;Wang Gang;Zhong Zhengxiang;Ma Qiang;Wang Zeyu;Feng Jicai
通讯作者：
Feng Jicai
影响因子：
5.7
作者：
Yuan-shou Shen;Zhenglin Li;C. Hao;Jinsong Zhang
通讯作者：
Yuan-shou Shen;Zhenglin Li;C. Hao;Jinsong Zhang
影响因子：
4.7
作者：
Youqiong Qin;Zhishui Yu
通讯作者：
Youqiong Qin;Zhishui Yu
影响因子：
9.4
作者：
A. Laik;P. Mishra;K. Bhanumurthy;G. Kale;B. Kashyap
通讯作者：
A. Laik;P. Mishra;K. Bhanumurthy;G. Kale;B. Kashyap