Calcium/aluminum alloys and process for their preparation
US4450136A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 9, 1982 |
| Grant date | May 22, 1984 |
| Priority date | — |
| Expiry date | Mar 9, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22F2998/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A substantially homogeneous calcium/aluminum alloy having a calcium/aluminum atomic ratio of from about 60/40 to 80/20 and with useful and unexpected properties of brittleness, passivity to atmospheric moisture and low volatility is prepared by a process which comprises adding aluminum under an inert atmosphere to molten calcium at a temperature of from about 550.degree. to 1100.degree. C. and at a rate to prevent substantial solids formation in the melt during the addition. The molten alloy is converted to particulate solid either by melt atomization or by casting, crushing and grinding. Lead/calcium/aluminum and tin/calcium/aluminum alloys are prepared by adding the calcium/aluminum alloy to the molten lead or tin, while calcium/aluminum/lithium alloy is prepared by adding lithium to the molten calcium/aluminum alloy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.