Honeycomb structure

Abstract

A honeycomb structure includes a ceramic block, a coating layer and at least one of the bonding layer and the coating layer. The ceramic block includes a plurality of honeycomb units that are bonded together and that have a plurality of cells partitioned by cell walls using a bonding layer. The coating layer is provided on an outer peripheral portion of the ceramic block. The at least one of the bonding layer and the coating layer includes bubble marks having a diameter in a range of approximately 100 μm to approximately 300 μm and includes no bubble marks having a size exceeding approximately 300 μm.

1 . A honeycomb structure comprising:
 a ceramic block including a plurality of honeycomb units that are bonded together and that have a plurality of cells partitioned by cell walls using a bonding layer;   a coating layer provided on an outer peripheral portion of the ceramic block; and   at least one of the bonding layer and the coating layer including bubble marks having a diameter in a range of approximately 100 μm to approximately 300 μm and including no bubble marks having a size exceeding approximately 300 μm.   
     
     
         2 . The honeycomb structure as claimed in  claim 1 , wherein each of the plurality of cells has two end portions, and one of the two end portions of each of the plurality of cells is sealed. 
     
     
         3 . The honeycomb structure as claimed in  claim 1 , wherein a catalyst is provided on each of the cell walls. 
     
     
         4 . The honeycomb structure as claimed in  claim 1 , wherein the honeycomb structure forms a diesel particulate filter that captures particulates within an exhaust gas. 
     
     
         5 . The honeycomb structure as claimed in  claim 1 , wherein the honeycomb structure forms a catalyst carrier that converts a toxic gas component within an exhaust gas. 
     
     
         6 . The honeycomb structure as claimed in  claim 1 , wherein the bonding layer includes an inorganic fiber and an inorganic binder. 
     
     
         7 . The honeycomb structure as claimed in  claim 1 , wherein the honeycomb structure includes the bonding layer and the bonding layer includes an inorganic binder, an organic binder and at least one of an inorganic fiber and inorganic particles. 
     
     
         8 . A honeycomb structure comprising:
 a ceramic block formed by a single honeycomb unit that has a plurality of cells partitioned by cell walls;   a coating layer provided on an outer peripheral portion of the ceramic block; and   the coating layer including bubble marks having a diameter in a range of approximately 100 μm to approximately 300 μm and including no bubble marks having a size exceeding approximately 300 μm.   
     
     
         9 . The honeycomb structure as claimed in  claim 8 , wherein each of the plurality of cells has two end portions, and one of the two end portions of each of the plurality of cells is sealed. 
     
     
         10 . The honeycomb structure as claimed in  claim 8 , wherein a catalyst is provided on each of the cell walls. 
     
     
         11 . The honeycomb structure as claimed in  claim 8 , wherein the honeycomb structure forms a diesel particulate filter that captures particulates within an exhaust gas. 
     
     
         12 . The honeycomb structure as claimed in  claim 8 , wherein the honeycomb structure forms a catalyst carrier that converts a toxic gas component within an exhaust gas.