Patent · US Expired

Method for the production of high-purity metal powder by means of electron beam heating

US4218410A · kind A · utility

25Cited by

4References

6Claims

0Family size

Assignee

Leybold-Heraeus GmbH & Co. KG · DE

Inventors

Herbert Stephan · Bruchköbel, DE
Hans Aichert · Hanau, DE
Joseph Heimerl · Altenhaßlau, DE

Key dates

Filing date	May 3, 1978
Grant date	Aug 19, 1980
Priority date	—
Expiry date	May 3, 1998

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB22F2009/084
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

High-purity metal powder is made by the electron beam melting of a starting material in rod form in a vacuum wherein the molten metal is momentarily caught on a spinning plate rotating at high speed and flung therefrom and thereafter solidified by cooling. The metal on the spinning plate is bombarded with an electron beam that is so focused and periodically deflected that its focal spot is many times smaller than the diameter of the spinning plate. The beam deflection between the rotational center of the spinning plate and its marginal area is performed such that the spinning plate is scanned in a zone that extends radially of the axis of rotation of the spinning plate and is small in relation to its diameter. Cooling of the metal particles to the point of solidification is accomplished by radiation loss.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.