A STUDY ON THE DIFFERENT REACTIVITY OF HF-PREHEATED AND UNTREATED NICALON FIBERS WITH 6061-ALLOY

An original apparatus, that allows us to follow directly the evolution of a ceramic-metal system from heating up to melting, was used to eva luate the system tendency to wettability and reactivity. Systems compo sed of Nicalon (NL 202) long fibers, untreated or pretreated with HF s olution for different times, and AA 6061 alloy were tested. The result s evidence the different diffusion of the elements, the deleterious ef fect of HF treatment and the consequences of using a W wire inside the system, as a heating resistance.