Porous metal structures made by thermal spraying fugitive material and metal
US4759957A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 20, 1985 |
| Grant date | Jul 26, 1988 |
| Priority date | — |
| Expiry date | May 20, 2005 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01D11/122
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Porous metal deposits especially useful in gas turbine engines as compressor seals are made by thermal spraying a metal powder and a meltable polymer powder mixture, wherein the spraying process and a subsequent polymer removal process are chosen to produce less than 30 weight percent oxide. Oxide contents of 4-25% are typical. When 86 weight percent nichrome is sprayed with 14 weight percent polymethylmethacrylate the polymer is removed by heating in air to about 315.degree. C. The resultant porous structure will have an oxide content of 7% and an apparent density of about 32%. A meltable polymer additionally produces a more desirable pore structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.