IMPROVEMENTS IN METHODS AND APPARATUS FOR COATING A MACROPOROUS METALLIC SUPPORT WITH A MICROPOROUS METALLIC LAYER
A method is given for coating a macroporous Ni tube with a layer of microporous Ni in order to obtain a diffusion barrier for isotope separation processes, e.g. the separation of UF/sub 6/. The tube, having pores of 1.3 microns, is interiorly coated with a 0.1 to 0.4 mm thick layer of a paste which consists of 50 vol% of Ni formate and 50 vol% of a binder (e.g. a methacrylate or alginate sol). A snugly fitting solid core is inserted in the tube, after which the tube is placed in an evacuable shell which allows a small clearance. The shell is heated at 240 deg C and an interior pressure of 10/sup -3/ mm Hg for 2 hr. Finally the shell is subjected to an exterior pressure of 3 tons/ cm/sup 2/ and heated at 150 deg C, after which the shell and the core are removed. The microporous coating has a pore size of 0.02 microns. (NPO)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-16-015098
- OSTI ID:
- 4793674
- Report Number(s):
- FR 1255382
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-62
- Country of Publication:
- France
- Language:
- English
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