A PROCESS MODEL FOR ACTIVE BRAZING OF CERAMICS .2. OPTIMIZATION OF BRAZING CONDITIONS AND JOINT PROPERTIES

In the present investigation, the process model developed in Part I ha s been applied to evaluate the microstructure and strength evolution d uring active brazing of ceramics. As a starting point, reaction-layer growth is assumed to occur isothermally with no restrictions in the su pply of reactive element. Different kinds of diagrams are then constru cted to show how specific process variables (e.g. the heating and cool ing period, the limiting layer thickness, and the diffusion mechanism) affect the growth kinetics. It is concluded that the key to improved joint properties lies in control of the reaction-layer thickness throu gh optimization of the brazing conditions, and an illustration of this is given.