METHOD FOR FORMING A LAYER OF SINGLE-PHASE OXIDE (FE, CR)2O3 WITH A RHOMBOHEDRAL STRUCTURE ON A STEEL OR SUPER ALLOY SUBSTRATE

WIPO Patent Application WO/2019/186024

A3

The invention relates to a method for forming a layer of single-phase oxide (30) (Fe, Cr)2O3 with a rhombohedral structure on a steel or super alloy substrate (10), comprising the following successive steps: a) supplying a steel or super alloy substrate (10) covered with a surface layer, the steel comprising at least 2 wt.-% chromium; b) removing the surface layer in an atomsphere containing at least 0.2 atm dioxygen, creating a level of micro-deformation in the crystal lattice of the steel or super alloy that is greater than 1.0.10-3, and heating at a heating rate higher than 400°C/s, such as to form a layer of rhombohedral oxide (30) (Fe, Cr)2O3 , c) carrying out a thermal treatment, in the presence of air, at a water partial pressure of less than 10.000ppm, and at a temperature varying between 400°C and 1000°C, such as to grow the layer of rhombohedral oxide formed in step (b) to a thickness of between 70nm and 150nm.

WO/2016/027207	A METHOD OF HARDENING DIE SURFACES
JP3044453	METHOD FOR ROUGHENING SURFACE OF METALLIC SHEET AND DEVICE THEREFOR

RACCURT OLIVIER (FR)
GENTZBITTEL JEAN-MARIE (FR)
SICARDY OLIVIER (FR)
BOURGUIGNON FRANCIS (FR)
MARCHAIS PIERRE-JEAN (FR)

PCT/FR2019/050583

November 21, 2019

March 15, 2019

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COMMISSARIAT ENERGIE ATOMIQUE (FR)
MANNESMANN PREC TUBES FRANCE (FR)

C23C8/02; C22C38/18; C23C8/14; C23C8/18; C23C8/80; F24S20/20; F24S70/20; F24S70/30

WO2015087021A1

2015-06-18

EP2341038A1	2011-07-06
FR2976349A1	2012-12-14

AHNER, Philippe (FR)

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