Publication: 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
Дата
2021
Авторы
Sliva, A.
Svetogorov, R.
Fedotov, I.
Suchkov, A.
Dzhumaev, P.
Kozlov, I.
Sevryukov, O.
Journal Title
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Volume Title
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Аннотация
© 2021 The Society of Manufacturing EngineersIn this work, two molybdenum-graphite X-ray targets for computed tomography/angiography devices were manufactured with usage of Ti-40Zr-8.5Nb-1.5Be filler metal and 1400 °C – 20 min brazing mode. To confirm the efficiency of the proposed brazing method, a mechanical test and simulated heating of the anodes were carried out, as well as a study of the evolution of the brazed joint under operating conditions. The brazed joint of the anodes showed stability and maintained integrity after tests. However, it is revealed that the long-term heat treatment of the brazed Mo/graphite joint leads to an increase in the amount of carbides in the seam, and also converts the seam into a refractory state by suppressing the formation of beryllium eutectic, while the cyclic heating mainly affects the recrystallization of the seam phases, leading to phase fragmentation. Shear strength tests after simulated heating show that the failure of the Mo/graphite joint occurs in the graphite element with cracking due to the infiltration of the filler metal into graphite through the open porosity. Infiltrates could provoke the occurrence of stresses during cyclic heating/cooling because of the difference in the CTE of graphite and carbide phases. Nevertheless, the joints remained integrity and showed a minimal strength of 23.4 ± 2.5 MPa (after 20 heating cycles of 350 ↔ 1400 °C) and 26.1 ± 6.4 MPa (after vacuum annealing of 1400 °C – 8 h).
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Цитирование
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 / Sliva, A. [et al.] // Journal of Manufacturing Processes. - 2021. - 69. - P. 142-151. - 10.1016/j.jmapro.2021.07.035
URI
https://www.doi.org/10.1016/j.jmapro.2021.07.035
https://www.scopus.com/record/display.uri?eid=2-s2.0-85111252716&origin=resultslist
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000693695600004
https://openrepository.mephi.ru/handle/123456789/24425
https://www.scopus.com/record/display.uri?eid=2-s2.0-85111252716&origin=resultslist
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000693695600004
https://openrepository.mephi.ru/handle/123456789/24425