Protective coatings for superplastic forming ceramic dies : an initial study on protective coatings performance

Staiano, Andrea and Ion, William and O'Hare, Lynne and Zuelli, Nicola (2016) Protective coatings for superplastic forming ceramic dies : an initial study on protective coatings performance. In: European Conference on Superplastic Forming, 2016-09-07 - 2016-09-09, Cite de l'Espace.

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    Abstract

    Superplastic forming (SPF) is an advanced manufacturing process, typically restricted to low volume and high value products, where metallic sheets are heated at the superplastic temperature and blow formed into a metallic die. Refractory ceramics are a low cost option to substitute the high temperature resistant steels and other alloys conventionally used in SPF dies, but their brittle nature is a limiting factor for most SPF applications. Suitable surface coatings have shown a significant effect on wear resistance and can be employed to improve the ceramic performance in terms of tool life increase. This paper is focused on an initial study on protective coatings for SPF ceramic dies, in order to evaluate their effectiveness for SPF forming. The tests were conducted using a dedicated test rig built at the Advanced Forming Research Centre (AFRC) where the die-blank interaction under SPF conditions was replicated at laboratory scale.