Method of depositing a thermally sprayed coating that is graded between being machinable and being wear resistant
US5958521A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 21, 1996 |
| Grant date | Sep 28, 1999 |
| Priority date | — |
| Expiry date | Jun 21, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T50/60
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method of thermally spraying a coating onto the interior of a cylindrical surface which coating is graded between enhanced optimal machinability and enhanced wear resistance. The method comprises the steps of; (a) preparing a cylindrical bore surface of a light metal substrate cleansed of grease and oils and modified to alter any oxide film present thereon; (b) thermally spraying a deposit of metallic droplets or particles onto the prepared bore surface using metal wire or powder feedstocks (low carbon steel or stainless steel) and a primary atomizing gas that projects the droplets or particles as a spray, the droplets or particles having a chemistry capable of metallurgically bonding with the metal of the substrate, the spray being positioned to lay down a generally uniform coating of such droplets or particles; and (c) varying the chemical content of the atomizing gas in two or more stages to proceed from essentially a metal droplet oxide-forming gas (air or oxygen) to essentially an inert or non-oxidizing gas (nitrogen or argon) relative to the droplets or particles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.