초록 ▼

The present invention provides a method of making a ceramic filter, by forming a mixture from NZP-forming raw material powders selected from metal oxide sources capable of reacting to form a reaction product comprising an NZP-type phase having the general formula R1+(y/2)Zr4P6-ySiyO24 where 0.ltoreq

The present invention provides a method of making a ceramic filter, by forming a mixture from NZP-forming raw material powders selected from metal oxide sources capable of reacting to form a reaction product comprising an NZP-type phase having the general formula R1+(y/2)Zr4P6-ySiyO24 where 0.ltoreq.y.ltoreq.1.0 and R is one or more of the metals Ca, Sr, and Ba, pre-reacted powder having the same general formula, and mixtures thereof; and a precursor additive selected from the group consisting of silica precursor, zirconia precursor, and mixtures thereof; shaping the mixture into a green structure; and, firing the green structure to produce a ceramic filter having an open porosity of at least 35% by volume, a median pore size of at least 8 micrometers and a permeability of at least 0.30.times.10-12 m2, and being suitable as a diesel particulate filter.

대표청구항 ▼

1. A method of making a ceramic body, the method comprising:a) forming a mixture comprising: NZP-forming raw material powders selected from the group consisting of metal oxide sources capable of reacting to form a reaction product comprising an NZP phase having the general formula R1+(y/2)Zr4P6-ySiy

1. A method of making a ceramic body, the method comprising:a) forming a mixture comprising: NZP-forming raw material powders selected from the group consisting of metal oxide sources capable of reacting to form a reaction product comprising an NZP phase having the general formula R1+(y/2)Zr4P6-ySiyO24 where 0.ltoreq.y.ltoreq.1.0 and R is one or more of the metals Ca, Sr, and Ba, pre-reacted powder having said general formula, and mixtures thereof; and, a precursor additive selected from the group consisting of silica precursor, zirconia precursor, and mixtures thereof; wherein the precursor additive results in improved strength during binder removal in the subsequent firing; b) shaping the mixture into a green structure; and, c) firing the green structure to produce a ceramic body, wherein the ceramic body has an open porosity of at least 35% by volume, a median pore size of at least 8 micrometers and a permeability of at least 0.30.times.10-12 m2.