Journal
MATERIALS & DESIGN
Volume 114, Issue -, Pages 176-184Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2016.10.062
Keywords
Reactive air brazing; Yttria-stabilized zirconia; Composite filler; Microstructure; Mechanical properties
Categories
Funding
- National Natural Science Foundation of China [51275133, U1537206]
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The YSZ ceramic coatedwith a copper layer (similar to 5 mu m) was successfully reactive air brazed using novel Al2O3 nanoparticles (NPs) reinforced Ag-CuO-Al2O3 composite filler. The effects of Al2O3 NPs content on the interfacial microstructure and joint properties were investigated. When the content of Al2O3 NPs was 8 wt.%, YSZ joints obtained fine interfacial microstructure and optimal mechanical properties. The coefficient of thermal expansion of composite filler was calculated to be 16.26 x 10(-6) K-1, presenting a decline of 12.1% compared to that of AgCuO base filler. The hardness and modulus values of braze joint slightly increased to 2.6 GPa and 164 GPa, respectively, possessing a better ability to resist deformation. Consequently, the YSZ joint possessed a maximum shear strength of 60 MPa, which was 25 MPa (similar to 71%) higher than that of the joints brazed using Ag-CuO base filler. The leakage rate of YSZ-tube/AgCuO-8Al(2)O(3)/YSZ-block samples was measured to be 3.2 +/- 0.9 x 10(-10) Pa m(3) s(-1), which met the leakage rate requirements for vacuum tight components (less than 10(-9) Pa m(3) s(-1)). It implied that this novel method was an effective way to obtain hermetic YSZ joints. (C) 2016 Elsevier Ltd. All rights reserved.
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