Honeycomb structure with high thermal shock resistance

• US 4,042,738 A
• Filed: 07/28/1975
• Issued: 08/16/1977
• Est. Priority Date: 07/28/1975
• Status: Expired due to Term

• Current Assignee: Corning Glass Works Inc. (Corning Incorporated)
• Original Assignee: Corning Glass Works Inc. (Corning Incorporated)
• Inventors: Gulati, Suresh T.
• Primary Examiner(s): Lesmes, George F.
• Assistant Examiner(s): Epstein, Henry F.
• Application Number:
  US05/599,624
• Time in Patent Office: 750 Days
• Field of Search: 23/288 FC, 52/615, 52/618, 156/197, 428/72, 428/73, 428/116-120, 428/188, 252/477 R
• US Class Current: 428/116
• CPC Class Codes: B01J 35/56 Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional monoliths
• CPC Class Codes: F01N 2330/06 Ceramic, e.g. monoliths
• CPC Class Codes: F01N 2330/34 with flow channels of polygonal cross section
• CPC Class Codes: F01N 3/2828 Ceramic multi-channel monoliths, e.g. honeycombs
• CPC Class Codes: Y10T 428/24149 Honeycomb-like
• CPC Class Codes: Y10T 428/24744 Longitudinal or transverse tubular cavity or cell

Abstract

A honeycomb structure is formed with a plurality of interconnected partitions which are unidirectionally discontinuous in a plane transverse to the longitudinal axis of the structure and which form a plurality of diamond-shaped cellular open portions extending longitudinally through the structure, to thereby provide a honeycomb structure with a relatively low bulk modulus and substantially isotropic moduli in transverse planes perpendicular to the longitudinal axis of the honeycomb structure, thus providing improved thermal shock resistance.

Claims

1. A ceramic honeycomb structure having improved thermal shock resistance comprising, a plurality of interconnected partitions extending longitudinally along the longitudinal extent of said honeycomb structure within a bounding wall portion and forming a plurality of cells or passageways extending longitudinally therethrough, said cells having a diamond shape when viewed in a plane transverrse to the longitudinal extent of said honeycomb structure, and said interconnected partitions being discontinuous in any one direction within said plane such that no continuous unidirectional partition extends transversely across said honeycomb structure within such plane.

2. A honeycomb structure as defined in claim 1 wherein said interconnected partitions are comprised of individual wall portions of said cells, and a maximum of two consecutive wall portions extend in any one direction within said plane.

3. A honeycomb structure as defined in claim 1 wherein said interconnected partitions which are discontinuous in any one direction within said plane are separated by a distance equivalent to the minor diagonal of a diamond-shaped cell positioned therebetween.

4. A honeycomb structure as defined in claim 1 wherein said interconnected partitions are comprised of the individual wall portions of said cells, and each wall portion, with the exception of those adjacent to said bounding wall portion, terminates at one end at an intersection of three wall portions, and at its opposite end at an intersection of six wall portions.

5. A ceramic honeycomb member having a bounding wall portion surrounding a plurality of interconnected longitudinally extending partitions which form a plurality of cells extending therebetween with a cellular structure when viewed in a plane perpendicular to the longitudinal axis of said partitions, said cellular structure comprising a plurality of diamond-shaped cells bounded by said interconnected partitions, said interconnected partitions forming individual wall portions of said cells, and said interconnected partitions being transversely continuous across said plane only in a multidirectional tortuous path.

6. A honeycomb member as defined in claim 5 wherein each of said individual wall portions, with the exception of those adjacent to said bounding wall portion, terminate at one end at an intersection with two additional individual wall portions, and at its opposite end at an intersection with five additional individual wall portions.

7. A honeycomb member as defined in claim 5 wherein alternate intersections of said interconnected partitions are surrounded by six diamond-shaped cells radially extending from such intersection with the other intersections between the alternate intersections being surrounded by three diamond-shaped cells.

8. A honeycomb member as defined in claim 7 wherein said radially extending diamond-shaped cells have major diagonals intersecting said alternate intersections at an angle of 60°

to one another, and the three diamonds surrounding said other intersection have minor diagonals intersecting such other intersection at an angle of 120°

with each other.