Method for producing porous permeable molded body
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United States of America Patent
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Jan 25, 2000
Issued Date -
N/A
app pub date -
Aug 12, 1998
filing date -
Mar 23, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A porous, flow-through molded body, designed specifically for use in the removal of diesel soot particles from the exhaust gas of diesel engines. It includes a reciprocally closed honeycombed body made of silicon carbide and possessing the following features. wall thickness: 1.25.+-.0.5 mm; porosity: 55 to 60%; average pore diameter: 25 to 70 .mu.m; specific permeability: 20 to 100 nPm. In the production method, a starting powder of silicon or a mixture of silicon with portions of silicon carbide and/or carbon is combined with an organic binding agent that can be coked and molded into a green body. This is then subjected to a coking fire in an inert-gas atmosphere; the molded body obtained in this manner is then heated in the presence of nitrogen or a nitrogenous inert gas to a temperature where free silicon is converted with the carbon, in a reaction firing, to silicon carbide. Additionally, a recrystallization firing at greater than 2000.degree. C. is implemented.
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