Patent · US Expired

Process for carburizing workpieces by means of a pulsed plasma discharge

US5558725A · kind A · utility

3Cited by

3References

9Claims

0Family size

Assignee

ALD VACUUM TECHNOLOGIES GMBH · DE

Inventors

Frank Schnatbaum · Braunschweig, DE
Albrecht Melber · Darmstadt, DE

Key dates

Filing date	Jul 5, 1995
Grant date	Sep 24, 1996
Priority date	—
Expiry date	Jul 5, 2015

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC23C8/38
WIPO fieldSurface technology, coating
WIPO sectorChemistry

Abstract

Workpieces of carburizable materials, especially steels, are carburized by means of a pulsed plasma discharge in a carbon-containing atmosphere at pressures of 0.1-30 mbars and at pulsed voltages of 200-2,000 V, preferably of 300-1,000 V. A continuously applied baseline voltage, which is below the breakdown voltage, is superimposed on the pulsed voltage. The baseline voltage is preferably a direct-current voltage, which is in the range of 10-150 V, preferably of 20-100 V.

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