摘要:
A honeycomb structure is manufactured by molding a pillar-shaped honeycomb molded body having a large number of cells disposed in parallel with one another in a longitudinal direction with a cell wall therebetween by extrusion-molding a raw material composition including a ceramic powder and a binder, and carrying out a firing treatment on the honeycomb molded body to manufacture a honeycomb fired body. A plurality of the honeycomb fired bodies are provided, and both end faces of each of the plurality of the honeycomb fired bodies are hold with a holding member after positioning the plurality of the honeycomb fired bodies on a predetermined position. An adhesive paste is injected into a gap between the plurality of honeycomb fired bodies held on the predetermined position. The adhesive paste is dried and solidified to form an adhesive layer.
摘要:
A honeycomb filter includes cell walls and cells. The cell walls extend along a longitudinal direction of the honeycomb filter to define the cells between the cell walls. The cells have first cells and second cells each having a substantially square shape in a cross-section perpendicular to the longitudinal direction. The first cells are sealed and the second cells are open at one end face of the honeycomb filter. The substantially square shape of the first cells includes a first side whose extended line intersects a second side except for corner portions of the substantially square shape of the second cells. The second side and the extended line of the first side are substantially perpendicular.
摘要:
An object of the present invention is to provide a honeycomb structural body which is low in pressure loss and can prolong a period up to a regenerating process. The present invention is directed to a columnar honeycomb structural body comprising a large number of through holes placed in parallel with one another in a length direction with wall portion interposed therebetween, wherein: each of the through holes has one of ends sealed; one end face of the through hole differs in opening area from the other end face thereof; a ceramic material which constitutes the wall portion has an average pore diameter in a range from 5 to 30 μm; and the rate of capacity of micro pores each having a pore diameter two or more times larger than the average pore diameter is set to 30% or less of the capacity of the entire micro pores.
摘要:
A honeycomb structural body includes a columnar honeycomb structural body having large-capacity through holes and small-capacity through holes extending in parallel in a length direction of the columnar structural body. The large-capacity through holes and the small-capacity through holes have a polygonal shape in a cross section perpendicular to the length direction, and the large-capacity through holes and the small-capacity through holes have R-chamfered corner portions or C-chamfered corner portions in the cross section perpendicular to the length direction.
摘要:
A method is provided that includes extrusion-molding a raw material composition containing ceramic powder and a binder to manufacture a coupled honeycomb molded body having a shape in which a plurality of pillar-shaped honeycomb molded bodies, each having a number of cells disposed in parallel with one another in a longitudinal direction with a cell wall therebetween, are integrated with one another by interposing a coupling portion. The method includes firing the coupled honeycomb molded body to manufacture a coupled honeycomb fired body, cutting the coupling portion to manufacture coupling-portion-cut honeycomb fired bodies, and binding a plurality of honeycomb fired bodies by interposing an adhesive layer, where at least one of the bound honeycomb fired bodies is a coupling-portion-cut honeycomb fired body.
摘要:
A column shaped filter having a honeycomb structure including a number of through holes extending parallel with one another in the length direction with wall portion interposed therebetween. The through holes are constituted by large-capacity through holes having a relatively larger cross-sectional area in the cross section perpendicular to the length direction and small-capacity through holes having a relatively smaller cross-sectional area in the cross section. The numbers of the two types of through holes are substantially set to the same. The large-capacity through holes are sealed at one end of the filter, while the small-capacity through holes are sealed at the other end of the filter. The large-capacity and small-capacity through holes have a ratio of partition wall length, α, and an aperture ratio, β, and α and β satisfy β≧(20/9)α2+1 (where 0
摘要:
A method of manufacturing a porous sintered body includes mixing first silicon carbide particles, second silicon carbide particles, and a pore forming material having an average particle diameter Y μm to obtain a molding material. The first silicon carbide particles have an average particle diameter X μm larger than an average particle diameter of the second silicon carbide particles. Relationships 15≦X, 0.5·X≦Z≦0.9·X, and 0.8·Z≦Y≦1.8·Z are satisfied, wherein Z μm is an average pore diameter of the porous sintered body no less than 10 μm and no greater than 20 μm. The molding material is molded into a molded body. The molded body is degreased to eliminate the pore forming material from the molded body.
摘要:
The invention provides a method for producing a porous body comprising: a starting material mixing step of mixing ceramic particles serving as an aggregate and a sintering aid which includes at least one element selected from the group consisting of rare earth elements, alkaline earth elements, Al and Si such that the amount of the sintering aid is about 1.0% by weight or less relative to the total amount of the ceramic particles and the sintering aid to form a puddle; and a molding and firing step of molding the puddle into a molded body and firing the molded body.
摘要:
A honeycomb filter for purifying exhaust gases that is free from occurrence of cracks and coming-off of plugs and is superior in durability upon its use. The honeycomb filter includes a columnar body made of porous ceramics, which has a number of through holes placed in parallel with one another in the length direction with wall portion interposed therebetween, designed so that predetermined of the through holes are filled with plugs at one end of the columnar body, while the through holes not filled with the plugs at the one end are filled with plugs at the other end of the columnar body, and part of or the entire wall portion functions as a plug for collecting particles. A bending strength Fα (MPa) of the honeycomb filter and a length L (mm) of the plug in the length direction of the through hole satisfy the relationship of Fα×L≧30.
摘要:
A honeycomb structure includes a honeycomb unit containing zeolite and an inorganic binder and having cell walls extending from one end to another end along a longitudinal direction of the honeycomb unit to define cells. An amount of zeolite contained per apparent unit volume of the honeycomb unit is approximately 230 g/L or more. A thickness X mm of the cell walls is in a range from approximately 0.15 mm to approximately 0.35 mm. A mathematical formula 40X+20≦Y≦40X+30 is satisfied when a porosity of the cell walls is defined as Y %.