Patent ID: 8206787

Claim:
A process for producing a honeycomb body from a noncatalytically active ceramic material for thermal regenerators, the process comprising the steps of: (a) providing a block-shaped monolithic honeycomb body created by extrusion, the honeycomb body having an interior formed with longitudinal channels; (b) applying a thermal pretreatment to the honeycomb body, whereby the honeycomb body includes surface pores; (c) after step (b), applying a glaze-repellent coating to outer walls of the honeycomb body, coating a glaze to all the longitudinal channels of the honeycomb body, and then drying the honeycomb body; and (d) after step (c), performing a firing operation to the glaze to anchor the glaze in the surface pores, wherein the glaze comprises 65% SiO 2 , 11% Al 2 O 3 , 1% Fe 2 O 3 , 6% CaO, 2% MgO, 2% Na 2 O, 3% K 2 O, 9% ZrO 2 , and 1% Cr 2 O 3 .