Patent · US Active

Process and apparatus for thermochemically hardening workpieces

US10626490B2 · kind B2 · utility

16Cited by

6References

39Claims

0Family size

Assignee

ALD VACUUM TECHNOLOGIES GMBH · DE

Inventors

Volker Heuer · Frankfurt am Main, DE
Klaus Loser · Seligenstadt, DE

Key dates

Filing date	Apr 15, 2014
Grant date	Apr 21, 2020
Priority date	—
Expiry date	Dec 30, 2035

Classification

Technology area (CPC H)Electricity
CPC primaryH01J2237/332
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A process and apparatus for thermochemically hardening workpieces is provided incorporating the following steps, carried out in a variable sequence: one or more carburizing steps, each in a carbon-containing gas atmosphere at a pressure of less than 50 mbar, the workpieces being held at temperatures of 900 to 1050° C.; if appropriate, one or more diffusion steps, each in a gas atmosphere at a pressure of less than 100 mbar; and one or more nitriding steps, each in a nitrogen-containing discharge plasma at a pressure of less than 50 mbar, the workpieces being held at temperatures of 800 to 1050° C.

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