Reactive Air Brazing of TiAl Alloy Using Ag-CuO: Microstructure and Joint Properties

Yang, Haoran; Si, Xiaoqing; Li, Chun; Cao, Jian

doi:10.3390/cryst11121496

Cited by 2 publications

(2 citation statements)

References 35 publications

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“…However, the resulting joints were easily oxidized at high temperatures, and the shear strength and hermeticity of joints reduced [9]. High vacuum and inert atmosphere limited the wide application of AMB [10][11][12][13][14][15][16][17], while it was worth noting that the joints brazed using RAB possessed excellent high-temperature oxidation resistance [18,19]. During the RAB process, the oxide compound may react with the surface of the ceramic, newly forming a surface wetting ceramic.…”

Section: Introductionmentioning

confidence: 99%

Study on Reactive Air Brazing of p-SiO2 Ceramic with Ag-xCuO Filler Metal

Chen,

Ma,

2023

Metals

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Reactive air brazing of porous SiO2 ceramic (p-SiO2) was achieved using Ag-CuO filler metal. When brazing p-SiO2, two main problems existed. Firstly, the wettability of the Ag filler metal on the surface of p-SiO2 was poor. Secondly, the residual stress caused by the mismatch of the coefficient of thermal expansion was high in the joint. In order to solve these problems, the effects of CuO contents on the p-SiO2 brazed joint were analyzed. In a wetting experiment, the addition of CuO significantly improved the wettability of the Ag-CuO/p-SiO2 system. With the content of CuO increasing, the contact angle decreased from 90° to 0°. In addition, when the content of CuO increased to 0.5 mol%, the contact angle decreased from 90° to 52°. Then, during brazing p-SiO2 with the Ag-xCuO filler metal, the typical interfacial microstructure of the joints brazed at 1000 °C for 30 min was p-SiO2 ceramic/Ag (s,s) + SiO2 + CuO/Ag (s,s)/Ag (s,s) + SiO2 + CuO/p-SiO2 ceramic. Meanwhile, Ag-CuO infiltrated into the p-SiO2 ceramic and an infiltration layer formed. The infiltration layer was composed of Ag (s,s) + SiO2 + CuO and the infiltration layer was conductive to form a good gradient transition of the coefficient of thermal expansion (CTE). Then, the residual stress in the joint was released and the shear strength improved. In addition, with the content of CuO increasing, the depth of the infiltration layer increased. Furthermore, when the content of CuO was 0.5 mol%, the maximum shear strength of the joint was 55 MPa.

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Section: Introductionmentioning

confidence: 99%

Study on Reactive Air Brazing of p-SiO2 Ceramic with Ag-xCuO Filler Metal

Chen,

Ma,

2023

Metals

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“…Therefore, joining Si 3 N 4 ceramic to other metals is an effective way to extend its industrial applications [8][9][10]. Brazing is regarded as one of the most economical and effective techniques to bond ceramics to other materials [11,12]. It is generally known that an excellent wettability is a crucial factor in obtaining the expected ceramic/metal joints [13].…”

Section: Introductionmentioning

confidence: 99%

Wettability and Spreading Behavior of Sn–Ti Alloys on Si3N4

Wang

Xue

et al. 2022

Crystals

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The purpose of this study was to investigate the wetting behavior and interfacial reactions of Sn-Ti alloys, which has been widely applied to join ceramics with metals, on Si3N4 substrates. The isothermal wetting process of Sn-xTi alloys (x = 0.5, 1.0, 1.5, 2.0 and 2.5 wt.%) on Si3N4 was systematically studied from 1223 K to 1273 K through sessile drop methods. The microstructures of the interface were characterized by X-ray diffraction (XRD) and microscope (SEM). The active Ti element remarkably enhanced the wettability of Sn-xTi melts on Si3N4 substrates because of the formation of metallic reaction layers (Ti5Si3 and TiN). With the Ti content rising, thicker Ti5Si3 layer formed on the TiN phase inducing a lower equilibrium contact angle. The value of the lowest contact angle was 6°, which was obtained in the Sn-2.0Ti/Si3N4 system at 1273 K. Larger Ti5Si3 grains were found in Sn-2.5Ti melt and a higher final contact angle was obtained. Lower temperature increased the final contact angle and slowed down the spreading rate. The formation of reaction products was calculated thematically, and the spreading kinetics was calculated according to the reaction-driven theory. The spreading behavior of Sn-Ti alloy on Si3N4 ceramic was composed of rapid-spreading stage and sluggish-spreading stage. The calculated activity energy of spreading was 395 kJ/mol. Eventually, the wetting process of Sn-2.0Ti/Si3N4 system was successfully elucidated. These results provide significant guidance information for the brazing between metals and Si3N4 ceramic.

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Reactive Air Brazing of TiAl Alloy Using Ag-CuO: Microstructure and Joint Properties

Cited by 2 publications

References 35 publications

Study on Reactive Air Brazing of p-SiO2 Ceramic with Ag-xCuO Filler Metal

Study on Reactive Air Brazing of p-SiO2 Ceramic with Ag-xCuO Filler Metal

Wettability and Spreading Behavior of Sn–Ti Alloys on Si3N4

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