ESTONIAN ACADEMY
PUBLISHERS
eesti teaduste
akadeemia kirjastus
cover
Estonian Journal of Engineering

Induction brazing of cermets to steel; pp. 232–242

Full article in PDF format | doi: 10.3176/eng.2012.3.08

Authors
Andres Laansoo, Jakob Kübarsepp, Vello Vainola, Mart Viljus

Abstract

The paper considers the induction brazing of TiC based cermets with Ni-Mo and Fe-Ni binder phase and Cr3C2 based cermets with Ni binder to structural and stainless steels under vacuum and air conditions. Commercially available traditional filler metals and experimental amorphous filler foils were tested. Possibility of mechanical metallizing of cermet surfaces with rotating Ti brushes prior to the brazing process was studied. Increase in the surface roughness after mechanical metallizing and non-uniform distribution of Ti on the treated surfaces were observed. Positive influence of electrochemically deposited Ag and Ni coatings on the shear strength of joints was found when optimal filler metals were used. Maximum shear strength up to 200–250 MPa was achieved with Ti- and Ni-based amorphous filler foils. Brazing in air by optimal fluxes and Ag- and Cu-based conventional brazing fillers can be used for brazing of cermets. Shear strength up to 150–190 MPa was achieved. The shear strength of vacuum brazed joints increases with the increase of the metal binder content in the cermet. Diffusion of the filler metal to base metal and to joint interface was studied by EPMA and SEM. It was found that cermets are successfully brazed with amorphous filler metals and the strength of the joints was not affected by the rapid heating during the induction process and relatively low vacuum.


References

  1. Hussainova, I., Pirso, J., Juhani, K., Antonov, M. and Letunovits, S. Erosion and abrasion of chromium carbide based cermets produced by different methods. Wear, 2007, 263, 905–911.
http://dx.doi.org/10.1016/j.wear.2006.12.027

  2. Klaasen, H., Kübarsepp, J. and Preis, I. Wear behaviour, durability and cyclic strength of TiC-base cermets. Mater. Sci. Technol., 2004, 20, 1006–1010.
http://dx.doi.org/10.1179/026708304225022043

  3. Zhang, L. X., Feng, J. C. and He, P. Brazing temperature and time effects on the mechanical properties of TiCcermet/Ag-Cu-Zn/steel joints. Mater. Sci. Eng., 2006, 428, 24–33.
http://dx.doi.org/10.1016/j.msea.2005.11.044

  4. Feng, J. and Zhang, L. Interface structure and mechanical properties of the brazed joint of TiC -cermet and steel. J. Eur. Ceram. Soc., 2006, 26, 1287–1292.
http://dx.doi.org/10.1016/j.jeurceramsoc.2005.01.043

  5. Zhang, L., Feng, J., Zhang, B. and Jing, X. Ag-Cu-Zn alloy for brazing TiC cermet/steel. Mater. Lett., 2005, 59, 110–113.
http://dx.doi.org/10.1016/j.matlet.2004.08.029

  6. Klaasen, H., Kübarsepp, J., Laansoo, A. and Viljus, M. Reliability of dual compounds “carbide composite + steel” produced by diffusion welding. Int. J. Refract. Met. Hard Mater., 2010, 28, 580–586.
http://dx.doi.org/10.1016/j.ijrmhm.2010.03.005

  7. Tillmann, W., Osmanda, A. M., Yurchenko, S. and Magin, M. Strength properties of induction brazed cermets. In Proc. International Conference on High Performance P/M Materials. Reutte, Austria, 2009, vol. 2, HM 26.

  8. Laansoo, A., Kübarsepp, J. and Klaasen, H. Diffusion welding and brazing of tungsten free hardmetals. In Proc. 7th International Conference on Brazing, High Temperature Brazing and Diffusion Welding. Aachen, 2004, DVS, 27–30.

  9. Rabinkin, A. Brazing filler metals. In Encyclopedia of Materials: Materials and Technology, 2002, 1–8.
http://dx.doi.org/10.1016/B0-08-043152-6/01838-6

10. Kalin, B. and Fedotov, V. Brazing dissimilar materials with rapidly solidified filler metal STEMET. In Proc. 7th International Conference on Brazing, High Temperature Brazing and Diffusion Welding. Aachen, 2004, DVS, 258–260.

11. Gross, S., Remmel, J. and Reisgen, U. Untersuchungen zum Hochtemperaturlöten von Keramik-Metall-Verbindungen. In Proc. 7th International Conference on Brazing, High Temperature Brazing and Diffusion Welding. Aachen, 2004, DVS, 146–149.

12. Nascimento, R. M., Martinelli, A. E., Buschinelli, A. J. A. and Sigismund, E. Interface micro­structure of alumina mechanically metallized with Ti brazed to Fe-Ni-Co using different fillers. Mater. Sci. Eng., 2007, 466, 195–200.
http://dx.doi.org/10.1016/j.msea.2007.02.033

13. Nascimento, R. M., Martinelli, A. E., Buschinelli, A. J. A., Reisgen, U. and Remmel, J. Micro­structure of brazed joint between mechanically metallized Si3N4 and stainless steel. J. Mater. Sci., 2005, 40, 4549–4556.
http://dx.doi.org/10.1007/s10853-005-0920-4


Back to Issue