| 摘要 |
PROBLEM TO BE SOLVED: To provide a tubular porous member with which an excellent filter characteristic can be assured by improving the manufacturability of the tubular porous member of a long size and small diameter. SOLUTION: The tubular porous member has a tubular substrate composed of a metallic powder sintered compact obtained by an extrusion molding method and a surface layer of a thickness≤0.1 mm and an average pore diameter≤2μm formed on the outer peripheral surface of the substrate, wherein the average pore diameter of the substrate is 2 to 10 times the average pore diameter of the surface layer and the total thickness T≤2 mm, a tube length L and an average external diameter D satisfy the relations L/D≤20 and D≤30 mm. The tubular porous member is formed to have a void content of preferably 40 to 85%. COPYRIGHT: (C)2005,JPO&NCIPI
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