Volume no :16, Issue no: 1, July (2017)

FABRICATION AND EVALUATION OF HYBRID COMPONENTS OF WC/INCONEL 600 BY LIQUID STATE DIFFUSION BONDING

Author's: Gustavo Castro-Sánchez, Christian I. Otero-Vázquez and José Lemus-Ruiz
Pages: [1] - [16]
Received Date: March 16, 2017
Submitted by:
DOI: http://dx.doi.org/10.18642/jmseat_7100121800

Abstract

The main objective of this work was to study various aspects of liquid state diffusion bonding of cylindrical samples of WC (with Co) and commercially pure super alloy Inconel 600 produced by brazing using a 25μm thick 70Cu-30Zn alloy as joining element. Joining experiments were carried out on WC/Cu-Zn/Inconel 600 combinations at temperature of 980°C and 1000°C using different holding times under argon (Ar) atmosphere. The results show that it is possible create a successful joint at temperature and times used and joining occurred by the formation of a diffusion zone. The joining is feasible because it presents an homogeneous interface with no several interfacial cracking and porosity. Scanning electron microscopy (SEM) micrographs show the different intermediate diffusion layers formed in the reaction zone, and the width of these layers increases with bonding temperature and time. Electron probe microanalysis (EPMA) revealed that at any particular bonding temperature, Co of the WC, as well as Ni, Cr, and Fe of the Inconel 600, travels into the Cu-Zn joining elements. Some points of precipitation of Cr are observed in both, close the WC and the Inconel 600 of the interface. Joining strength was obtained by shear testing with a maximum joint strength of 44MPa for WC/Cu-Zn/Inconel 600 samples joined at 1000°C and 25 minutes.

Keywords

WC, inconel 600, diffusion bonding, Cu-Zn alloy, sheer strength.