HONEYCOMB MONOLITH STRUCTURE IN POROUS CERAMIC MATERIAL, AND USE AS A PARTICLE FILTER

摘要

A honeycomb-type monolith structure, which can be used in particular as a particulate filter for exhaust gases from diesel engines, consists of a solid having a plurality of channels opening onto the end faces of said monolith, but alternately open and closed, said monolith consisting of a porous refractory material comprising: - from 70 to 97% by mass of silicon carbide of alpha crystallographic type and / or, having at least one particle size and preferably at least two particle sizes - and from 3 to 30% by mass of at least one ceramic bonding phase in the form of a micron powder or of particles obtained by atomization, comprising at least one simple oxide chosen for example from B2 O3, Al2 O3, SiO2, MgO, K2 O, Li2 O, Na2 O, CaO, BaO, TiO2, ZrO2 and Fe2 O3 and / or at least one mixed oxide chosen, for example, from alkaline aluminosilicates (from Li, Na, or K) or alkaline earth aluminos (from Mg, Ca, Sr or Ba ), the s clays, bentonite, feldspars or other natural silico-aluminous materials. The manufacture of the monolith implements a calcination step under an atmosphere containing oxygen at a temperature which can range up to 1650 degreC, but preferably lower than 1550 degreC.