EP 0089885 B1 19870826 - METHOD OF SURFACE-HARDENING METALLIC PARTS
Title (en)
METHOD OF SURFACE-HARDENING METALLIC PARTS
Publication
Application
Priority
FR 8204874 A 19820323
Abstract (en)
[origin: ES8402361A1] In a surface hardening process for metal parts by nitriding or carbonitriding, the parts to be treated are placed in a furnace and maintained at a temperature of between 490 DEG C. and 750 DEG C., in a nitrogen bearing atmosphere, such atmosphere formed by introducing into the furnace a gaseous mixture comprising in particular ammonia and an oxidizing gas for accelerating the catalytic dissociation of ammonia in contact with said parts. The oxidizing gas is nitrous oxide and the gaseous mixture contains about 0.1% to 10% by volume of nitrous oxide. The invention is well suited for the surface hardening of steel parts.
IPC 1-7
IPC 8 full level
CPC (source: EP US)
Citation (examination)
GB 2049740 A 19801231 - HUYTON HEAT TREATMENTS LTD
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
EP 0089885 A2 19830928; EP 0089885 A3 19841205; EP 0089885 B1 19870826; AT E29154 T1 19870915; AU 1253583 A 19830929; AU 554394 B2 19860821; CA 1215901 A 19861230; DE 3373197 D1 19871001; ES 520824 A0 19840116; ES 8402361 A1 19840116; FR 2524006 A1 19830930; FR 2524006 B1 19851011; JP S58174573 A 19831013; US 4531984 A 19850730; ZA 831884 B 19831130
DOCDB simple family (application)
EP 83400541 A 19830316; AT 83400541 T 19830316; AU 1253583 A 19830317; CA 424129 A 19830322; DE 3373197 T 19830316; ES 520824 A 19830322; FR 8204874 A 19820323; JP 4733483 A 19830323; US 47636983 A 19830317; ZA 831884 A 19830317