Investigation of Diffusion Welding Capability of WC Ceramic Based Ni Doped Composites

Abstract

In this study, sample pairs of (WC) Ni / (WC) Ni and WC-Ni / WC-Ni formed from (WC) Ni composites produced from Ni coated WC powders and uncoated WC-Ni / powders were used for diffusion welding. Diffusion welding was carried out by preloaded compression system under Ar atmosphere. Diffusion welding was obtained by changing bonding pressure and temperature. Schimadzu 100kN universal tensile machine was employed for tensile shear testing of diffusion welded couples. The tensile shear test results showed that electroless nickel coated WC(Ni) composite diffusion couples yielded best tensile shear load bearing capacity 35,4 MPa compared to other diffusion couples. Hardness values ranging from 200 to 400HV were determined. SEM and XRD analysis systems were used to analyze the microstructural analysis of the composites and diffusion welded samples obtained in the study and to analyze the particles formed at the weld interface.