Simulated thermal tests of a molybdenum/graphite X-ray target manufactured with a novel Ti-Zr-Nb-Be powder filler metal: an investigation of the brazed joint evolution under operating conditions

Fedotov, Ivan; Сучков, А. Н.; Слива, А. П.; Джумаев, П. С.; Kozlov, Ilya; Светогоров, Р. Д.; Sevryukov, O. N.

doi:10.1016/j.jmapro.2021.07.035

Cited by 11 publications

(4 citation statements)

References 18 publications

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“…[ 2–6 ] For example, the fabrication of microwave tube in hot cathode component involves joining Mo to W. [ 7 ] In addition, the manufacturing of X‐ray anode targets in computed tomography and angiography equipment includes joining Mo to graphite. [ 8 ]…”

Section: Introductionmentioning

confidence: 99%

“…Fedotov et al studied Mo/graphite brazing with Ti–Zr–Nb–Be powder filler at 1400 °C. [ 8 ] The joining area was mainly composed of β‐(Ti,Mo)(ss), carbides (TiC and ZrC), and beryllide (MoBe 2 and TiBe 2 ). Lu et al brazed Mo alloy to graphite at 1300–1700 °C using fillers including Ti–56Ni, Ti–8.5Si, Ti–33Cr, and Ti–30V–3Mo.…”

Section: Introductionmentioning

confidence: 99%

“…Although the study of Mo/W and Mo/graphite brazing has been carried out by many researchers, there are still some problems. For example, the brazing temperature used in Mo/W and Mo/graphite brazing is quite high (1400 °C for Ni–Mo filler, 1610 °C for Pd foil, 1400 °C for Ti–Zr–Nb–Be filler, 1300–1700 °C for Ti–56Ni, Ti‐–8.5Si, Ti–33Cr, and Ti–30V–3Mo fillers, 1420–1510 °C for Ti–40Cr filler), [ 7,8,10–12 ] which may lead to high energy consumption and high cost. In addition, the use of relatively high pressure in brazing (0.5–1 MPa for pressure brazing) may cause the complexity of processing.…”

Section: Introductionmentioning

confidence: 99%

“…[ 13 ] Furthermore, the use of Ti–Zr–Nb–Be filler in Mo/graphite brazing may be limited due to the potential toxicity of Be. [ 8 ] Therefore, it is essential and useful to investigate Mo/W and Mo/graphite brazing with a nontoxic filler at a relatively low brazing temperature.…”

Section: Introductionmentioning

confidence: 99%

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Microstructural and Mechanical Characterizations of Mo/W and Mo/Graphite Joints with BNi2 Paste

Xu,

Cai,

Haider

et al. 2023

Adv Eng Mater

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Brazing of Mo to W and to graphite is achieved using BNi2 paste (containing Ni, Cr, Si, and B). For the Mo/W or Mo/graphite joint, the joining area consists of a diffusion area and a brazing area. The diffusion area is composed of MoNi and Mo, which is formed by diffusion of the Mo substrate into the braze during brazing. The brazing area of the Mo/W joint contains Ni(ss) (solid solution), Cr(ss), Ni3B, CrB, and Ni4W, while the brazing area of the Mo/graphite joint mainly comprises Ni(ss), MoNi, Ni3B, and CrB. A continuous chromium carbide layer is formed at the brazing area/graphite interface in the Mo/graphite joint due to the reaction of Cr in the BNi2 braze with the graphite. Nanoindentation measurements of the joints show that the diffusion area exhibits the highest hardness and elastic modulus in the joints. The shear strengths of the Mo/W and Mo/graphite joints are 58.1 ± 16.0 and 13.0 ± 4.0 MPa, respectively. The Mo/W and Mo/graphite joints fracture after the shear tests in the W and graphite sides, respectively, near the joining area, indicating that both fractures are caused by the stress concentration in the corresponding areas.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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