EP 0076488 B1 19880323 - PROCESS FOR FORMING FE2B LAYERS ON ARTICLES OF FERROUS ALLOYS
Title (en)
PROCESS FOR FORMING FE2B LAYERS ON ARTICLES OF FERROUS ALLOYS
Publication
Application
Priority
DE 3139462 A 19811003
Abstract (en)
[origin: EP0076488A2] 1. Process for the production of Fe2 B coatings on iron-based alloy workpieces in a heated reaction chamber to which BCI3 (boron trichloride) as boron-containing gas is fed together with H2 gas as carrier gas, characterized in that, as a further carrier gas, N2 gas under atmospheric pressure is fed to the gas mixture in the reaction chamber and, in a first treatment stage, an amount of BCI3 gas which is less than 5% of the gas mixture in the furnace atmosphere is selected for rapid build-up of an iron boride coating, with an FeB coating on the surface and an Fe2 B coating thereunder, and, in a second, immediately subsequent treatment stage, the thickness of the FeB coating is substantially reduced using a lower concentration of BCI3 in the furnace atmosphere, or a concentration which is approaching zero.
IPC 1-7
IPC 8 full level
CPC (source: EP)
C23C 8/08 (2013.01)
Citation (examination)
Härterei Technische Mitteilungen 39 (1984) S. 7-15
Designated contracting state (EPC)
AT CH DE FR GB IT LI NL SE
DOCDB simple family (publication)
EP 0076488 A2 19830413; EP 0076488 A3 19840822; EP 0076488 B1 19880323; AT E33152 T1 19880415; DE 3139462 A1 19830421; DE 3278266 D1 19880428
DOCDB simple family (application)
EP 82109090 A 19821001; AT 82109090 T 19821001; DE 3139462 A 19811003; DE 3278266 T 19821001