WO2002081769A2 - Procede de traitement de pieces en alliage ferreux pour ameliorer leurs proprietes frottantes, sans perte de leur durete ni deformation - Google Patents
Procede de traitement de pieces en alliage ferreux pour ameliorer leurs proprietes frottantes, sans perte de leur durete ni deformation Download PDFInfo
- Publication number
- WO2002081769A2 WO2002081769A2 PCT/FR2002/001091 FR0201091W WO02081769A2 WO 2002081769 A2 WO2002081769 A2 WO 2002081769A2 FR 0201091 W FR0201091 W FR 0201091W WO 02081769 A2 WO02081769 A2 WO 02081769A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- coating
- ferrous alloy
- fractal dimension
- deformation
- improve
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D9/00—Electrolytic coating other than with metals
- C25D9/04—Electrolytic coating other than with metals with inorganic materials
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12771—Transition metal-base component
- Y10T428/12861—Group VIII or IB metal-base component
- Y10T428/12951—Fe-base component
- Y10T428/12958—Next to Fe-base component
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
- Y10T428/264—Up to 3 mils
- Y10T428/265—1 mil or less
Definitions
- the present invention relates to a method of treating ferrous alloy parts to improve their friction properties, mainly their resistance to seizing and sticking, without the risk of losing their hardness or deformation.
- the invention applies to steel or cast iron parts with high mechanical characteristics, that is to say, whose tempering temperature is less than 200 ° C.
- lubricants consists in separating the surfaces in contact with a film which promotes sliding and the elimination of calories.
- the film of lubricant prevents the appearance of micro-welds responsible for seizing and transfer of material.
- the lubricant film must have a thickness greater than the height of the surface roughness. The thickness of the film largely depends on the surface physicochemical properties and the morphology of the surfaces on a microscopic scale.
- the machined raw steel has surface characteristics such that the thickness of the lubricant films is generally insufficient to ensure continuous lubrication when the loads or speeds become high.
- the physicochemical properties of compounds such as iron phosphate or iron sulfide are responsible for the better wetting of lubricants, the surface energy of these constituents being much greater than that of steel. These constituents also have a low shear strength as well as an excellent ability to accommodate, which allows them to improve the running-in conditions and the wear resistance of the contacts subjected to surface fatigue.
- Electrolytic sulfurization in molten salts in brine is taught in FR-A-1 406 530.
- Sulfurization at low temperature is carried out in a mixture of molten salts at a temperature around 200 ° C with the assistance of an anodic electrolysis leading to the formation of hexagonal iron sulfide FeS.
- An object of the invention is to obtain ferrous alloy parts having improved friction properties under extreme conditions of pressure and speed, mainly their resistance to seizing and sticking without loss of their hardness or deformation.
- the Applicant has surprisingly found that for ferrous alloy parts comprising an iron sulphide coating, the fractal dimension of the surface of the iron sulphide coating plays a role. preponderant, and in any case much more influential than that of stoichiometry, crystal structure or even purity.
- the Applicant has therefore developed a process for obtaining a piece of ferrous alloy bearing a very high seizing charge with a very low dispersion as well as a high number of cycles, consisting in depositing on said piece a coating of sulphide of iron having an appropriate thickness and Fe / S ratio, characterized in that the coating is selected from those whose surface has a fractal dimension at least equal to 2.6.
- the parts obtained according to the process of the present invention support a seizing load according to the FAVILLE LEVALLY machine test according to standard AST -D-2670 at least equal to approximately 3000 daN with a tolerance at most equal to approximately 5% and a number of cycles according to the Hamsler test at least equal to about 300.
- the coating is selected from those whose surface has a fractal dimension of between 2.65 and 2.75.
- the coating is selected from those having a stoichiometry corresponding to an Fe / S ratio of between approximately 0.69 and 0.85.
- the coating will also be favorably selected from those having a thickness of less than about 15 ⁇ m, better still, less than about 6 ⁇ m.
- the fractal dimension is obtained from a roughness meter, for example a non-contact confocal type 3D roughness meter, the characteristics of which are as follows: Lateral resolution 300 nm
- the data obtained using the roughness meter are then introduced into a specific calculation algorithm which extracts the mathematical quantities necessary for obtaining the fractal dimension.
- a high resolution roughness meter is essential to guarantee an accurate measurement of the fractal dimension.
- a contactless roughness tester is also important to use a contactless roughness tester to ensure that no change in surface morphology has been produced when measuring roughness profiles.
- the iron sulfide coatings of ferrous alloy parts are obtained by treatments known to those skilled in the art, for example by electrolytic sulfurization in a bath of molten salts according to patent FR-A-1 406 530, or else sulfurization in brine or sulfurization in a salt bath, as the Applicant has demonstrated in its experiments.
- the present invention also relates to the parts selected according to the method described.
- Example 1 illustrates the invention without limitation.
- Cylindrical specimens (cylinders) with a diameter of 6.35 mm and a height of 40 mm made of hardened rectified hardened 16 NC6 steel were treated under the conditions below:
- test pieces have a coating of iron sulphide.
- the test pieces are then oiled and then subjected to the test on a FAVILLE LEVALLY machine (according to ASTM-D-2670) by rotating the treated cylinder between two jaws of hardened and hardened 16NC6 steel without additional treatment.
- the test consists in increasing the load applied to the cylinder until seizure appears. seizure, the tests having been reproduced 5 times in order to evaluate the average seizure load as well as the measurement dispersion.
- Each cylinder is characterized before the tests in order to determine the fractal size of the surface of the coating after treatment.
- the fractal dimension is obtained from a 3D roughness tester of the non-contact confocal type, the characteristics of which are as follows: Lateral resolution 300 nm
- the data obtained using the roughness meter are then introduced into a specific calculation algorithm which extracts the mathematical quantities necessary for obtaining the fractal dimension.
- the coatings whose surface has a fractal dimension at least equal to 2.6 are selected.
- the parts (cylinders) according to the invention have a seizure load according to the FAVILLE LEVALLY machine test according to standard ASTM-D-2670 at least equal to approximately 3000 daN.
- the cylinders coated with iron sulphide according to the invention have a seizure charge approximately 3 times greater than the best results obtained hitherto with slightly fractal iron sulphide.
- Example 2 Tests were carried out according to DIN standard 51350 (parts 1 to 5) on a machine known as a "4-ball machine" to complete the seizure tests and check the influence of the Fe / S ratio and the thickness of the layer. iron sulfide.
- Hardened case-hardened CrMo4 steel discs for HRC 60 with a diameter of 60 mm and a thickness of 10 mm were treated under conditions 1, 2 and 3 described in Example 1 and an additional condition described below: Condition 4: Sulfurization in brine.
- the coatings are selected from those whose surface has a fractal dimension at least equal to 2.6.
- the coatings are selected from those whose surface has a fractal dimension at least equal to 2.6.
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Lubricants (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Steel (AREA)
- Chemically Coating (AREA)
- Paper (AREA)
- Adornments (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2002257854A AU2002257854A1 (en) | 2001-04-04 | 2002-03-28 | Method for treating ferrous alloy parts in order to improve the rubbing properties thereof without causing hardness loss or deformation |
EP02727644A EP1386018B1 (fr) | 2001-04-04 | 2002-03-28 | Procede de traitement de pieces en alliage ferreux pour ameliorer leurs proprietes frottantes, sans perte de leur durete ni deformation |
JP2002579528A JP4545376B2 (ja) | 2001-04-04 | 2002-03-28 | 硬度の喪失または変形なしで、摩擦特性を改良するための鉄合金構成部材の処理方法 |
US10/474,187 US7172794B2 (en) | 2001-04-04 | 2002-03-28 | Method for treating ferrous alloy parts in order to improve the rubbing properties thereof without causing hardness loss or deformation |
CA002443005A CA2443005C (fr) | 2001-04-04 | 2002-03-28 | Procede de traitement de pieces en alliage ferreux pour ameliorer leurs proprietes frottantes, sans perte de leur durete ni deformation |
AT02727644T ATE468419T1 (de) | 2001-04-04 | 2002-03-28 | Verfahren zur behandlung von teilen aus eisenlegierung zur verbesserung der reibeigenschaften ohne verursachung von härteverlust oder verformung |
DE60236425T DE60236425D1 (de) | 2001-04-04 | 2002-03-28 | Verfahren zur behandlung von teilen aus eisenlegierung zur verbesserung der reibeigenschaften ohne verursachung von härteverlust oder verformung |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0104580A FR2823227B1 (fr) | 2001-04-04 | 2001-04-04 | Procede de traitement de pieces en alliage ferreux pour ameliorer leurs proprietes frottantes, sans perte de leur durete ni deformation |
FR01/04580 | 2001-04-04 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2002081769A2 true WO2002081769A2 (fr) | 2002-10-17 |
WO2002081769A3 WO2002081769A3 (fr) | 2002-12-12 |
Family
ID=8861931
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2002/001091 WO2002081769A2 (fr) | 2001-04-04 | 2002-03-28 | Procede de traitement de pieces en alliage ferreux pour ameliorer leurs proprietes frottantes, sans perte de leur durete ni deformation |
Country Status (12)
Country | Link |
---|---|
US (1) | US7172794B2 (fr) |
EP (1) | EP1386018B1 (fr) |
JP (1) | JP4545376B2 (fr) |
AT (1) | ATE468419T1 (fr) |
AU (1) | AU2002257854A1 (fr) |
CA (1) | CA2443005C (fr) |
DE (1) | DE60236425D1 (fr) |
ES (1) | ES2344832T3 (fr) |
FR (1) | FR2823227B1 (fr) |
MY (1) | MY137691A (fr) |
TW (1) | TWI275664B (fr) |
WO (1) | WO2002081769A2 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2860806B1 (fr) * | 2003-10-14 | 2006-01-06 | Stephanois Rech Mec | Procede de traitement par sulfuration de pieces en alliage ferreux |
FR2909102B1 (fr) * | 2006-11-24 | 2009-03-06 | Hef Soc Par Actions Simplifiee | Procede de sulfuration de pieces en alliage ferreux en solution aqueuse. |
WO2011001640A1 (fr) * | 2009-06-29 | 2011-01-06 | 新日本製鐵株式会社 | Fil de fer galvanisé au zinc-aluminium et son procédé de fabrication |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5981934A (en) * | 1996-09-12 | 1999-11-09 | Canon Kabushiki Kaisha | Photovoltaic element having a transparent conductive layer with specified fractal dimension and fractal property |
US6689424B1 (en) * | 1999-05-28 | 2004-02-10 | Inframat Corporation | Solid lubricant coatings produced by thermal spray methods |
-
2001
- 2001-04-04 FR FR0104580A patent/FR2823227B1/fr not_active Expired - Lifetime
-
2002
- 2002-03-28 WO PCT/FR2002/001091 patent/WO2002081769A2/fr active Application Filing
- 2002-03-28 ES ES02727644T patent/ES2344832T3/es not_active Expired - Lifetime
- 2002-03-28 AU AU2002257854A patent/AU2002257854A1/en not_active Abandoned
- 2002-03-28 CA CA002443005A patent/CA2443005C/fr not_active Expired - Fee Related
- 2002-03-28 JP JP2002579528A patent/JP4545376B2/ja not_active Expired - Lifetime
- 2002-03-28 EP EP02727644A patent/EP1386018B1/fr not_active Expired - Lifetime
- 2002-03-28 DE DE60236425T patent/DE60236425D1/de not_active Expired - Lifetime
- 2002-03-28 US US10/474,187 patent/US7172794B2/en not_active Expired - Lifetime
- 2002-03-28 AT AT02727644T patent/ATE468419T1/de not_active IP Right Cessation
- 2002-04-02 MY MYPI20021200A patent/MY137691A/en unknown
- 2002-04-03 TW TW091106772A patent/TWI275664B/zh not_active IP Right Cessation
Non-Patent Citations (2)
Title |
---|
ANTONUCCI P L ET AL: "Fractal surface characterization of chalcogenide electrodeposits" MATERIALS SCIENCE AND ENGINEERING B, ELSEVIER SEQUOIA, LAUSANNE, CH, vol. 38, no. 1, 1 mars 1996 (1996-03-01), pages 9-15, XP004017420 ISSN: 0921-5107 * |
VAZQUEZ L ET AL: "Scanning tunneling microscopy characterization of the morphology of Fe/C multilayers grown on silicon substrates" JOURNAL OF APPLIED PHYSICS, 1 JAN. 1994, USA, vol. 75, no. 1, pages 248-254, XP002177388 ISSN: 0021-8979 * |
Also Published As
Publication number | Publication date |
---|---|
WO2002081769A3 (fr) | 2002-12-12 |
US7172794B2 (en) | 2007-02-06 |
CA2443005C (fr) | 2009-02-03 |
US20040146753A1 (en) | 2004-07-29 |
EP1386018A2 (fr) | 2004-02-04 |
TWI275664B (en) | 2007-03-11 |
FR2823227B1 (fr) | 2004-04-02 |
CA2443005A1 (fr) | 2002-10-17 |
DE60236425D1 (de) | 2010-07-01 |
MY137691A (en) | 2009-02-27 |
JP2004526059A (ja) | 2004-08-26 |
JP4545376B2 (ja) | 2010-09-15 |
AU2002257854A1 (en) | 2002-10-21 |
ATE468419T1 (de) | 2010-06-15 |
ES2344832T3 (es) | 2010-09-08 |
EP1386018B1 (fr) | 2010-05-19 |
FR2823227A1 (fr) | 2002-10-11 |
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