| 摘要 |
In a honeycomb - eg for use as a monolith for a catalytic converter in vehicle exhausts - mechanical strength is improved if those axially-running passages which occur at the periphery of the body are blocked by ceramic material. Only those passages which, by reason of being at the periphery, have a significantly smaller cross-sectional area than the other passages are sealed. These passages (or cells) are termed "incomplete cells" and are preferably those which have a cross-section of no more than 80% of that of the complete cells. This can eliminate catalyst being wasted by being put into passages through which exhaust gas would pass in small quantities. As shown in Figure 2, only the significantly narrower passages 2b are sealed with ceramic 4. The preferred material for the honeycomb is cordierite, and it is also preferred that sealant 4 is of the same material as the honeycomb. <IMAGE> |
