期刊
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
卷 26, 期 3, 页码 1114-1121出版社
SPRINGER
DOI: 10.1007/s11665-017-2571-4
关键词
brazing; ceramic matrix composite; interface; microstructure
资金
- National Natural Science Foundation of China, People's Republic of China [51175037]
In order to characterize the interfacial behavior of brazed joints and offer theoretical basis for the applications of TiZrCuNi-based composite fillers, C-f/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, Ti-2(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 A degrees C and the holding time was 25 min, the maximum shear strength of brazed joints attained a value of 143.2 MPa.
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