Directions and developments in the types of hard phases to be applied in braze deposits against abrasion

Abstract

Abrasion is one of the most significant forms of wear affecting mechanical parts. It is mainly reduced by hardening the surfaces involved and one of the systems used involves the application of brazing to deposit tungsten carbides as antagonists to abrasion.

This paper analyses the types and the characteristics of the carbides commonly used, evaluates the oxy-acetylene flame depositing system, and describes the major forms present on the market and their developments. The paper also describes the latest improvement trends for obtaining increased performance and compares laboratory test results.

Keywords:

• brazing fillers
• filler materials
• flame brazing
• flame spraying
• hardening
• hardness
• microstructure
• surface hardening
• tungsten carbide
• wear
• wear resistance

Notes

Paper presented at the 4th National Welding Day, Workshop: ‘Brazing’ Genova, 25–26 October 2007.