Interpenetrating Network Metal-Ceramic FGM – Preparation and Properties
A new method for processing large flat compositionally graded metal-ceramic parts with connected interpenetrating metal and ceramic network is described. Based on powder metallurgical methods, a metal foam is obtained by slip casting of metal powder slurries on a polyurethane foam, and used as preform to achieve a metallic interpenetration within the composite. The porous metallic preform is infiltrated with a ceramic slip and co-sintered. The metallic part is made from Ni-Cr-alloy, or the P/M superalloy Saratherm 2 and Nimonic 90, the ceramic consists of pure 8Y-ZrO2 or zirconia mixed with ZrSiO4. Composites of nominal same composition sintered without the metal foam preform show no metallic interpenetration.
Akira Kawasaki, Akinaga Kumakawa and Masayuki Niino
M. Neukam and M. Willert-Porada, "Interpenetrating Network Metal-Ceramic FGM – Preparation and Properties", Materials Science Forum, Vols. 631-632, pp. 471-476, 2010