COMBINATION OF HARDFACE BRAZE TAPES WITH PRE-SINTERED BRAZE SHEETS FOR WALL THICKNESS REDUCTION
Publication Date: 2012-Mar-31
The IP.com Prior Art Database
Wear resistant coatings are used to protect metal parts operating in a hot gas environment from degradation caused by e.g. mechanical wear, oxidation and corrosion. Areas of application for such coatings are steam turbines and gas turbines. One specific example for the application of such coatings are surfaces exposed to the hot gas path and/or surfaces adjacent to hot gases, especially when there is physical contact to other surfaces. Wear resistant coatings are typically applied by spraying, welding or brazing processes. It is a standard process to renew them after service. In cases where heavy wear occurs during service, reapplication of just the hardface coating is sometimes not sufficient rather restoration of the wall thickness is also required. As a consequence hardface brazing has emerged as a process where wall thickness build-up and wear protection can be achieved in one process step, thus providing cost savings compared to traditional spraying. The materials necessary for hardface brazing and the hardface brazing process including a brazing cycle which was specifically developed for brazing tapes are described in the document.