초록 ▼

A structure made predominately of an NZP-type phase having the general formula RxZ4P6-ySiyO24, where 0.ltoreq.x.ltoreq.8, 0.ltoreq.y.ltoreq.6, R is Li, Na, K, Rb, Cs, Mg, Ca, Sr, Ba, Y, and/or lanthanides, and Z is Zr, Ti, Nb, Ta, Y, and/or lanthanidess, and optionally a sintering additive. The stru

A structure made predominately of an NZP-type phase having the general formula RxZ4P6-ySiyO24, where 0.ltoreq.x.ltoreq.8, 0.ltoreq.y.ltoreq.6, R is Li, Na, K, Rb, Cs, Mg, Ca, Sr, Ba, Y, and/or lanthanides, and Z is Zr, Ti, Nb, Ta, Y, and/or lanthanidess, and optionally a sintering additive. The structure has an open porosity of at least 20% by volume, median pore diameter in micrometers of at least a value defined by the quantity [10-0.10(% open porosity)], both as measured by mercury porosimetry, and four-point modulus of rupture as measured on a solid rod of circular cross section, of at least 300 psi. Method of making the structure involves forming a mixture of NZP-forming raw material powders that are metal oxide sources capable of reacting to form an NZP-type reaction product, and/or pre-reacted powder having the above general formula. The volumetric average of the median particle diameters of the raw material powders in the raw materials combination is at least 15 micrometers, and the particle diameters of at least 65% by volume of the totality of the raw material particles are greater than 11 micrometers. The mixture is shaped into a green structure, and fired to produce the finished structure. The structure is preferably multicellular, e.g. a honeycomb, where a fluid stream enters the structure, passes through the cells and is acted upon, and exits the structure. The structure is preferably an alternately plugged honeycomb suitable as a diesel particulate filter.

대표청구항 ▼

1. A structure comprising predominately an NZP-type phase having the general formula RxZ4P6-ySiyO24, wherein 0.ltoreq.x.ltoreq.8, 0.ltoreq.y.ltoreq.6, R is selected from the group consisting of Li, Na, K, Rb, Cs, Mg, Ca, Sr, Ba, Y, lanthanides, and combinations thereof, Z is selected from the group

1. A structure comprising predominately an NZP-type phase having the general formula RxZ4P6-ySiyO24, wherein 0.ltoreq.x.ltoreq.8, 0.ltoreq.y.ltoreq.6, R is selected from the group consisting of Li, Na, K, Rb, Cs, Mg, Ca, Sr, Ba, Y, lanthanides, and combinations thereof, Z is selected from the group consisting of Zr, Ti, Nb, Ta, Y, lanthanides, and combinations thereof, and optionally a sintering additive, and having an open porosity of at least about 20% by volume as measured by mercury porosimetry, a median pore diameter in micrometers of equal to or greater than a value defined by the quantity [10-0.10(% open porosity)] as measured by mercury porosimetry, and a four-point modulus of rupture as measured on a solid rod of circular cross section of at least about 300 psi.