Method for making porous mullite-containing composites

C - Chemistry – Metallurgy – 04 – B

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C04B 35/185 (2006.01) C04B 35/195 (2006.01) C04B 41/50 (2006.01)

Patent

CA 2736100

Porous composites of mullite and cordierite are formed by firing an acicular mullite body in the pres-ence of a magnesium source and a silicon source. In some variations of the process, the magnesium and silicon sources are present when the acicular mullite body is formed. In other variations, the magnesium source and the silicon source are applied to a previously-formed acicular mullite body. Surprisingly, the composites have coeffi-cients of linear thermal expansion that are intermediate to those of mullite and cordierite alone, and have higher frac-ture strengths than cordierite at a similar porosity. Some of the cordierite forms at grain boundaries and/or points of in-tersection between mullite needles, rather than merely coat-ing the needles. The presence of magnesium and silicon sources during acicular mullite formation does not signifi-cantly affect the ability to produce a highly porous network of mullite needles.

Linvention concerne des composites poreux contenant de la mullite et de la cordiérite formées par cuisson dun corps de mullite aciculaire en présence dune source de magnésium et dune source silicium. Selon certaines variantes du procédé, les sources de magnésium et de silicium sont présentes lorsque le corps de mullite aciculaire est formé. Selon dautres variantes, la source de magnésium et la source de silicium sont appliquées à un corps de mullite formé antérieurement. De manière étonnante, les composites présentent des coefficients dexpansion linéaire thermique qui sont intermédiaires à ceux de la mullite et de la cordiérite seules, et présentent des résistances à la rupture plus élevées que la cordiérite à une porosité similaire. Une partie de la cordiérite se forme à la frontières entre les grains et/ou aux points dintersection entre les aiguilles de mullite plutôt que par simple revêtement des aiguilles. La présence de sources de magnésium et de silicium pendant la formation de mullite aciculaire naffecte pas significativement la capacité à produire un réseau daiguilles de mullite hautement poreux.

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