Application of Sacrificial Layers in the Manufacture of Multilayer Al–Ni Foil with the Effect of Self-expanding High-temperature Synthesis

The features of the use of sacrificial layers in the manufacture of multilayer Al–Ni foil, characterized by the effect of self-expanding high-temperature synthesis, are considered. In order to avoid peeling during the foil production, there must be good adhesion between the substrate and the foil. On the other hand, to produce the final product, the foil must be peeled off the surface of the substrate, which implies a low degree of adhesion. It is possible to resolve this technological contradiction by using sacrificial layers, that is, films of material that are applied to the substrate before forming the foil, and then dissolved or etched off, thereby destroying the physical bond between the foil and the substrate. For this reason, it is particularly relevant to study the use of various materials as sacrificial layers in the manufacture of multilayer foils with the effect of self-expanding high-temperature synthesis. A variant of the layout of a magnetron sputtering system is proposed, which makes it possible to use six magnetrons in a single technological cycle for the formation of a multilayer Al–Ni structure. The thickness of the obtained foil is determined using electron microscopy. It is shown that the use of a polyvinyl alcohol film with a thickness of 30 microns as a sacrificial layer makes it possible to peel off multilayer Al–Ni foil without mechanical damage and loss of the ability to react with self-expanding high-temperature synthesis.

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