Open Access
Nuclear Materials and Energy, volume 9, pages 388-393
Brazing of Be with CuCrZr-bronze using copper-based filler metal STEMET
Publication type: Journal Article
Publication date: 2016-12-01
Journal:
Nuclear Materials and Energy
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor: 2.6
ISSN: 23521791
Materials Science (miscellaneous)
Nuclear and High Energy Physics
Nuclear Energy and Engineering
Abstract
At the D.V. Efremov Scientific Research Institute of Electrophysical Apparatus (SRIEA), elements of the ITER first wall (beryllium tiles and heat removal CuCrZr-bronze) are currently joined by ``fast'' brazing (heating with a rate of 150 K/min) using the method of passing a current through brazed samples. For this purpose, rapidly quenched brazing filler metal STEMET 1101 is used. The thermal cycle of brazing consists of a fast heating of the assembly to a temperature of 700–720 °C and a subsequent cooling (rate of 60 K/min). However at these temperatures, processes resulting to a loss of the tensile and shear strength of CuCrZr can occur. Therefore, reducing the brazing temperature is a very important task. Optimization of the composition of the Cu–Ni–Sn–P system filler metals and comparative tests of filler metals of various compositions have been carried out in this paper to reduce the brazing temperature of beryllium with CuCrZr. Alloys of the following compositions Cu–6.4Ni–9.2Sn–6.3P (STEMET 1105) and Cu–9.1Ni–3.6Sn–8.0P (STEMET 1101) were made in the form of rapidly quenched ribbons with a thickness of 50 µm and a width of 50 mm. They were used to perform furnace brazing by Joule heating (with a rate of 15 K/min) of beryllium with CuCrZr (Be/CuCrZr) at temperatures of 650, 700 and 750 °C for 15 min. Metallographic investigations of the zone of brazing and mechanical shear tests of joints before and after the heat treatment at 350 °C for 30 h have been conducted. It was found that the joints of Be/CuCrZr brazed at 650 °C using STEMET 1105 (τs = 230 MPa) and at 750 °C using STEMET 1101 (τs = 260 MPa) had the best shear strength properties. However, there is a significant decrease of the microhardness of CuCrZr from 1570 to 1140 MPa at 750 °C, which indicates a significant loss of its strength. The results obtained suggest that the brazing of beryllium with CuCrZr using STEMET 1105 at 650–700 °C will not adversely affect the CuCrZr.
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Kalin B. et al. Brazing of Be with CuCrZr-bronze using copper-based filler metal STEMET // Nuclear Materials and Energy. 2016. Vol. 9. pp. 388-393.
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Kalin B., Suchkov A. N., Fedotov V., Sevryukov O. N., Ivannikov A. A., Gervash A. A. Brazing of Be with CuCrZr-bronze using copper-based filler metal STEMET // Nuclear Materials and Energy. 2016. Vol. 9. pp. 388-393.
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TY - JOUR
DO - 10.1016/j.nme.2016.07.004
UR - https://doi.org/10.1016%2Fj.nme.2016.07.004
TI - Brazing of Be with CuCrZr-bronze using copper-based filler metal STEMET
T2 - Nuclear Materials and Energy
AU - Suchkov, A N
AU - Fedotov, V.T
AU - Sevryukov, O N
AU - Ivannikov, A A
AU - Gervash, A A
AU - Kalin, B.A
PY - 2016
DA - 2016/12/01 00:00:00
PB - Elsevier
SP - 388-393
VL - 9
SN - 2352-1791
ER -
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@article{2016_Kalin,
author = {A N Suchkov and V.T Fedotov and O N Sevryukov and A A Ivannikov and A A Gervash and B.A Kalin},
title = {Brazing of Be with CuCrZr-bronze using copper-based filler metal STEMET},
journal = {Nuclear Materials and Energy},
year = {2016},
volume = {9},
publisher = {Elsevier},
month = {dec},
url = {https://doi.org/10.1016%2Fj.nme.2016.07.004},
pages = {388--393},
doi = {10.1016/j.nme.2016.07.004}
}