Effect of Ni-Ti filler on brazed W-Cu/18-8 joints

Xia, Chunzhi; Sun, Weifeng; Zhou, Yi; Zhao, Meng

doi:10.1016/j.jmatprotec.2018.04.018

Cited by 8 publications

(4 citation statements)

References 11 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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“…Compared with the crystalline filler metal, a brazed joint comprising amorphous filler metal exhibits a finer structure and a uniform inclusion distribution in the composition, which can reduce the soldering gap of the brazed joint and significantly improve the quality [5][6][7]. The microstructure and composition of brazing joints primarily depend on the structure and composition of the filler metal.…”

Section: Introductionmentioning

confidence: 99%

Micromorphology change and microstructure of Cu-P based amorphous filler during heating process

Xia

2019

High Temperature Materials and Processes

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The changes that occur in the microstructure of crystalline and amorphous Cu-P-Sn-Ni filler metals during the heating process were studied by high-temperature microscopy, and the composition of solders at certain temperatures were analyzed by scanning electron microscopy and X-ray diffraction. The amorphous solder was observed to transform from amorphic to crystalline during the process of heating and distinct surface morphology changes were apparent, while the internal structure of the crystalline brazing filler metal was found to be relatively stable. During the heating process, the amorphous brazing filler metal formed a ϒ-Cu solid solution with a small amount of Cu3P compounds, Cu88Sn22 and (Cu, Ni)3P phase compounds, ultimately forming the Cu88Sn22 + Ni12P5 + (Cu, Ni)3P3 three-element eutectic structure.

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“…Among them, high temperature brazing seems to be the most suitable method because of its limited influence on properties of base materials. In order to braze tungsten alloy, various components of filler metals have been investigated, such as Fe-based filler metals [12,13], Ni-based filler metals [14,15] and Cu-based filler metals [16,17]. However, when the brazing temperature is above the recrystallization temperature of W (1100–1370 °C), performance changes of base metals such as grain growth, harden, and embrittlement could occur because of the high melting point of filler metals [18].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ti on Microstructure and Properties of Tungsten Heavy Alloy Joint Brazed by CuAgTi Filler Metal

Qiu

Ruan

et al. 2019

Materials

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In this paper, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffractometer (XRD) were used to comprehensively analyze the microstructure and brazing performance of a CuAgTi filler metal with braze tungsten heavy alloys. The association of microstructure, wettability and shear strength of brazing joints was also investigated. With the addition of Ti, the Ti3Cu4 phase appeared in the microstructure of filler metal. Ti is active element that promotes the reaction of filler with tungsten. Therefore, the Ti element is enriched around tungsten and forms a Ti2Cu layer at the interface, leaving a Cu-rich/Ti-poor area on the side. Remaining Ti and Cu elements form the acicular Ti3Cu4 structure at the center of the brazing zone. The wettability of filler metal is improved, and the spreading area is increased from 120.3 mm2 to 320.9 mm2 with the addition of 10 wt.% Ti. The shear strength of joint reaches the highest level at a Ti content of 2.5 wt.%, the highest shear strength is 245.6 MPa at room temperature and 142.2 MPa at 400 °C.

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Effect of Ni-Ti filler on brazed W-Cu/18-8 joints

Cited by 8 publications

References 11 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

Micromorphology change and microstructure of Cu-P based amorphous filler during heating process

Effect of Ti on Microstructure and Properties of Tungsten Heavy Alloy Joint Brazed by CuAgTi Filler Metal

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