Extrusion processing of dense MgAl2O4 spinel honeycombs with low relative density

Honeycomb structures were extruded from MgAl2O4 spinel dough with optimum rheological properties. Extruded honeycombs are sintered at 1700 °C followed by hot isostatic pressing (HIP) to achieve close to theoretical densities. Honeycombs have shown a density of 3.57 g/cc along with the cellular properties such as wall thickness of 90 µm, cell opening of 350×350 µm2, cell density of 900 channels per square inch and relative density of 0.45.