摘要:
The invention is to provide a novel process for producing aluminum titanate-based ceramics having a low coefficient of thermal expansion. The invention is a process for producing an aluminum titanate-based ceramic comprising firing a starting material mixture containing a titanium source powder, an aluminum source powder and a silicon source powder, wherein the particle diameter corresponding to a cumulative percentage of 50% (D50) on a volume basis of the silicon source powder is not greater than 5 μm. The invention includes the process wherein the starting material mixture further contains a magnesium source powder.
摘要:
The present invention is a process for producing an aluminum titanate ceramics, comprising firing a starting material mixture containing a titanium source powder and an aluminum source powder, wherein a content of niobium, expressed on the oxide basis, is not less than 0.2 parts by mass and not more than 2.5 parts by mass in 100 parts by mass of the starting material mixture.
摘要:
Manufacture of ceramic honeycomb fired body. Green molded body is placed on a firing base and fired. The firing base and green molded body are each a column containing a ceramic raw material and having a partition wall forming a plurality of flow paths, and patterns of end surfaces of the two partition walls are the same as each other as seen from an extending direction of the flow paths. The green molded body is placed on the firing base displaced in a horizontal direction by a predetermined distance, or rotated around a vertical axis V of the green molded body by a predetermined angle θ, so that only a part of the lower side end surface of the partition wall of the green molded body is in contact with the upper side end surface of the partition wall of the firing base.
摘要:
The mask of the invention is used for plugging of the cells of a honeycomb structure, and it has a plurality of first through-holes running through a thickness direction of the mask, in a region that is to contact with an end face of the honeycomb structure when used. The first through-holes have an open area of 0.03 mm2 or greater, and less than 90% of an open area of the cells to be plugged through the first through-holes.
摘要:
A method for manufacturing a honeycomb-structured object having a plurality of through holes having ends thereof plugged, including a step of pressing a plugging material against one end surface of a honeycomb-structured object 70 having a plurality of through holes 70a by a plate 20 to fill one ends of the through holes 70a with the plugging material; and a step of protruding a part of a portion in the plate 20 opposed to the one end surface of the honeycomb-structured object 70 toward the one end surface to pull the other part of the portion in the plate 20 opposed to the one end surface of the honeycomb-structured object 70 and the one end surface away from each other.
摘要:
The invention is to provide a process for producing an aluminum titanate-based ceramics capable of realizing low thermal expansion and high mechanical strength and having little dimensional change in firing, at a low firing temperature of lower than 1500° C. The invention is a process for producing an aluminum titanate-based ceramics fired body comprising a step of shaping a ceramic plastic rammed earth containing a precursor mixture and an organic-based binder into a predetermined shape, wherein the starting material mixture containing a titanium source powder, an aluminum source powder and a silicon source powder, and a step of maintaining the shaped ceramics plastic rammed earth within a temperature range of from 900 to 1350° C. at a temperature change per hour of from −50 to +50° C./hr for 3 hours or more, followed by heating up to a temperature of 1400° C. or higher and firing at the temperature. And the invention is an aluminum titanate-based ceramics fired body that is obtained by the said invention and having a porosity of from 30 to 60%.
摘要:
A plugging device 100 including a main body portion 10 having a depressed portion 10d and a communication path 10e opening into an inner surface 10c of the depressed portion 10d; an elastic plate 20 fixed to the main body portion 10 so as to cover the depressed portion 10d; and a pump 50 connected to the communication path 10e.
摘要:
The present invention provides a green molded body capable of easily controlling the porosity of a honeycomb structure. One aspect of the present invention is a green molded body composed of a honeycomb-shaped cylindrical body 70 with a plurality of through holes 70a being formed approximately in parallel with each other, wherein the cylindrical body 70 comprises a ceramic raw material powder and a fluorine source, and wherein the ceramic raw material powder is the one for forming at least one of an aluminum titanate-based ceramics and a cordierite-based ceramics by sintering.
摘要:
The present invention is a process for producing an aluminum titanate-based fired body, comprising shaping a starting material mixture containing inorganic compound source powders including an aluminum source powder and a titanium source powder, as well as an additive, degreasing the obtained shaped body at 150 to 900° C., and firing the degreased shaped body at not lower than 1300° C., wherein the inorganic compound source powders contain 1 to 5 parts by mass of particles having a particle diameter of not larger than 0.1 μm in 100 parts by mass thereof.