BE556999A - - Google Patents
Info
- Publication number
- BE556999A BE556999A BE556999DA BE556999A BE 556999 A BE556999 A BE 556999A BE 556999D A BE556999D A BE 556999DA BE 556999 A BE556999 A BE 556999A
- Authority
- BE
- Belgium
- Prior art keywords
- aluminum
- parts
- subjected
- diffusion
- forging
- Prior art date
Links
- 229910052782 aluminium Inorganic materials 0.000 claims description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminum Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 12
- 238000005242 forging Methods 0.000 claims description 7
- 238000009792 diffusion process Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 230000003647 oxidation Effects 0.000 claims description 5
- 238000007254 oxidation reaction Methods 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N al2o3 Chemical class [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N oxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000005755 formation reaction Methods 0.000 claims 1
- 239000002344 surface layer Substances 0.000 claims 1
- 238000005260 corrosion Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- -1 iron-aluminum Chemical compound 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/60—Efficient propulsion technologies, e.g. for aircraft
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating By Spraying Or Casting (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Description
<Desc/Clms Page number 1>
Il est connu de munir les cônes des soupapes d'admission et d' échappement des moteurs à combustion interne ainsi que d'autres pièces qui sont soumises à de hautes températures et exposées à la corrosion, d'un revêtement protecteur aux endroits qui subissent les fatigues les plus éle- véeso
On a constaté qu'un revêtement d'aluminium constitue une protection efficace contre la corrosion et l'oxydation.
Ainsi on connaît déjà à l'é- tranger des cônes de soupapes d'admission et d'échappement qui ont été pour- vus d'une couche d'aluminium aux endroits exposés pour augmenter la dura- bilité de la soupape
Les pièces reçoivent un revêtement d'aluminium par leur immersion dans un bain d'aluminium en fusion ou par aspersion d'aluminium au moyen d'un procédé de projection de métalo Par un traitement thermique subséquent dans des bains de sel, il se produit une diffusion de l'aluminium dans la zone superficielle du corps. Il se forme alors à la surface un alliage de feraluminium qui présente une grande résistance à la corrosion et à l'oxy- dation.
Ces procédés connus offrent toutefois certaines difficultés. Ainsi, il se produit par l'incandescence de diffusion un étirage des pièces déjà achevées. Un usinage ultérieur n'est généralement pas possible, de telle sorte qu'il en résulte beaucoup de rebuts c'est-à-dire que ce procédé est limité à peu de cas.
L'invention par contre consiste à munir les soupapes d'échappement et d'admission ou autres pièces telles que les chambres de combustion, les aubes de turbines, etc qui sont soumises à des fatigues d'origine thermi- que les plus élevées, d'un revêtement d'aluminium suivant les procédés con- nus, avant le forgeage qui leur donne la forme définitiveSuivant l'inven- tion ces pièces sont ensuite chauffées dans une atmosphère d'oxygène à la température de forgeage et au delà, de telle sorte qu'il se produit une diffusion de l'aluminium dans le corps de la matière ainsi qu'une oxydation de l'aluminium à la surface (Al + O2 = Al2O3).
Il se forme donc des éléments céramiques qui, comme ou le sait, résistent à des actions thermiques con- sidérableso Après chauffage à la température de forgeage, les pièces re- çoivent leur forme définitive par forgeage ou compression. Les oxydes qui résistent à l'action des hautes températures sont refoulés par forgeage dans la surface ferrugineuse à aluminium diffusé, de telle sorte qu'ils ne peuvent plus se dégager ultérieurement. Les pièces ainsi traitées acquiè- rent par suite de la forte teneur en matières céramiques dans la surface une résistance à la chaleur et à la corrosion notablement plus élevées que celle obtenue dans les procédés connus jusqu'ici.
REVENDICATIONS.
**ATTENTION** fin du champ DESC peut contenir debut de CLMS **.
<Desc / Clms Page number 1>
It is known to provide the cones of the intake and exhaust valves of internal combustion engines as well as other parts which are subjected to high temperatures and exposed to corrosion, with a protective coating at the places which are subjected to damage. heaviest fatigue o
It has been found that an aluminum coating provides effective protection against corrosion and oxidation.
For example, intake and exhaust valve cones are already known abroad which have been provided with a layer of aluminum at the exposed places in order to increase the durability of the valve.
The parts receive an aluminum coating by their immersion in a bath of molten aluminum or by spraying aluminum by means of a metal spraying process. By a subsequent heat treatment in salt baths, a diffusion of aluminum in the superficial area of the body. An iron-aluminum alloy is then formed on the surface, which exhibits high resistance to corrosion and oxidation.
These known methods, however, present certain difficulties. Thus, by the diffusion incandescence there is a stretching of the already completed parts. Subsequent machining is generally not possible, so that a lot of scrap results, ie this process is limited to few cases.
The invention, on the other hand, consists in providing the exhaust and intake valves or other parts such as combustion chambers, turbine blades, etc. which are subjected to the highest thermal fatigue, d 'an aluminum coating according to known processes, before forging which gives them the final shape. According to the invention these parts are then heated in an atmosphere of oxygen to the forging temperature and above, in such a way that there is a diffusion of aluminum in the body of the material as well as an oxidation of the aluminum at the surface (Al + O2 = Al2O3).
Ceramic elements are therefore formed which, as we know, resist considerable thermal actions. After heating to the forging temperature, the parts receive their final shape by forging or compression. The oxides which resist the action of high temperatures are forced back by forging into the ferruginous surface with diffused aluminum, so that they cannot be released later. The parts thus treated acquire, as a result of the high content of ceramics in the surface, a resistance to heat and to corrosion which is considerably higher than that obtained in the methods known hitherto.
CLAIMS.
** ATTENTION ** end of DESC field can contain start of CLMS **.
Claims (1)
Publications (1)
Publication Number | Publication Date |
---|---|
BE556999A true BE556999A (en) |
Family
ID=180575
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BE556999D BE556999A (en) |
Country Status (1)
Country | Link |
---|---|
BE (1) | BE556999A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3529987A (en) * | 1956-05-28 | 1970-09-22 | Jerome H Lemelson | Method of coating conduit |
-
0
- BE BE556999D patent/BE556999A/fr unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3529987A (en) * | 1956-05-28 | 1970-09-22 | Jerome H Lemelson | Method of coating conduit |
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