Metallurgical bonding of coated inserts within metal castings
US6484790B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 31, 1999 |
| Grant date | Nov 26, 2002 |
| Priority date | — |
| Expiry date | Aug 31, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C6/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for forming light-weight composite metal castings incorporating metallurgically bonded inserts for a variety of applications. Castings formed by the invention have particular utility as components of an internal combustion engine. A casting method includes the step of coating the insert with a first layer under conditions including sufficient temperature to cause a portion of the layer to be sacrificed by dissolving into the cast metal material while leaving at least a portion of the first layer as a diffusion barrier between the insert and the cast material. The molten casting material is treated and handled to keep the hydrogen content below 0.15 and preferably below 0.10 parts per million. The casting step takes place under a protective gas environment of dry air, argon or nitrogen with a moisture content of less than 3 parts per million.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.