EP2057107A1 - Schlichte zur herstellung einer bn-haltigen beschichtung, verfahren zu deren herstellung, beschichteter körper, dessen herstellung und dessen verwendung - Google Patents
Schlichte zur herstellung einer bn-haltigen beschichtung, verfahren zu deren herstellung, beschichteter körper, dessen herstellung und dessen verwendungInfo
- Publication number
- EP2057107A1 EP2057107A1 EP07801637A EP07801637A EP2057107A1 EP 2057107 A1 EP2057107 A1 EP 2057107A1 EP 07801637 A EP07801637 A EP 07801637A EP 07801637 A EP07801637 A EP 07801637A EP 2057107 A1 EP2057107 A1 EP 2057107A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sizing
- weight
- size
- coated body
- coating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000576 coating method Methods 0.000 title claims abstract description 72
- 239000011248 coating agent Substances 0.000 title claims abstract description 39
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 claims abstract description 31
- 239000000758 substrate Substances 0.000 claims abstract description 31
- 229910001593 boehmite Inorganic materials 0.000 claims abstract description 26
- 239000007787 solid Substances 0.000 claims abstract description 15
- 150000001639 boron compounds Chemical class 0.000 claims abstract description 12
- 150000002894 organic compounds Chemical class 0.000 claims abstract description 11
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000002105 nanoparticle Substances 0.000 claims abstract description 8
- 238000004513 sizing Methods 0.000 claims description 35
- 229910052751 metal Inorganic materials 0.000 claims description 26
- 239000002184 metal Substances 0.000 claims description 26
- 239000000843 powder Substances 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 239000000203 mixture Substances 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 11
- 229910021538 borax Inorganic materials 0.000 claims description 9
- 235000010339 sodium tetraborate Nutrition 0.000 claims description 9
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 7
- 239000004327 boric acid Substances 0.000 claims description 7
- 238000000265 homogenisation Methods 0.000 claims description 7
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 claims description 7
- 239000004328 sodium tetraborate Substances 0.000 claims description 7
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000000919 ceramic Substances 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 150000002739 metals Chemical class 0.000 claims description 6
- 229910052580 B4C Inorganic materials 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 239000000956 alloy Substances 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 230000001680 brushing effect Effects 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 4
- 238000010304 firing Methods 0.000 claims description 4
- 229910052749 magnesium Inorganic materials 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 3
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 3
- 239000012736 aqueous medium Substances 0.000 claims description 3
- 229910052796 boron Inorganic materials 0.000 claims description 3
- 239000000470 constituent Substances 0.000 claims description 3
- 238000011065 in-situ storage Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 238000007598 dipping method Methods 0.000 claims description 2
- 239000004744 fabric Substances 0.000 claims description 2
- 239000000835 fiber Substances 0.000 claims description 2
- 229920005615 natural polymer Polymers 0.000 claims description 2
- 239000003921 oil Substances 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 238000009987 spinning Methods 0.000 claims description 2
- 229920001059 synthetic polymer Polymers 0.000 claims description 2
- 229910052718 tin Inorganic materials 0.000 claims description 2
- VLCLHFYFMCKBRP-UHFFFAOYSA-N tricalcium;diborate Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]B([O-])[O-].[O-]B([O-])[O-] VLCLHFYFMCKBRP-UHFFFAOYSA-N 0.000 claims description 2
- RIUWBIIVUYSTCN-UHFFFAOYSA-N trilithium borate Chemical compound [Li+].[Li+].[Li+].[O-]B([O-])[O-] RIUWBIIVUYSTCN-UHFFFAOYSA-N 0.000 claims description 2
- WUUHFRRPHJEEKV-UHFFFAOYSA-N tripotassium borate Chemical compound [K+].[K+].[K+].[O-]B([O-])[O-] WUUHFRRPHJEEKV-UHFFFAOYSA-N 0.000 claims description 2
- BSVBQGMMJUBVOD-UHFFFAOYSA-N trisodium borate Chemical compound [Na+].[Na+].[Na+].[O-]B([O-])[O-] BSVBQGMMJUBVOD-UHFFFAOYSA-N 0.000 claims description 2
- 239000001993 wax Substances 0.000 claims description 2
- 229910052725 zinc Inorganic materials 0.000 claims description 2
- 229910052726 zirconium Inorganic materials 0.000 claims description 2
- 150000003014 phosphoric acid esters Chemical class 0.000 claims 1
- 238000007789 sealing Methods 0.000 abstract 1
- 238000005299 abrasion Methods 0.000 description 10
- 239000011230 binding agent Substances 0.000 description 9
- 238000002360 preparation method Methods 0.000 description 9
- 239000000725 suspension Substances 0.000 description 7
- 229910052582 BN Inorganic materials 0.000 description 6
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 6
- 238000011835 investigation Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 5
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000002609 medium Substances 0.000 description 4
- 239000000155 melt Substances 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 229910017604 nitric acid Inorganic materials 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052810 boron oxide Inorganic materials 0.000 description 2
- 235000010980 cellulose Nutrition 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- -1 ferrous metals Chemical class 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 238000005058 metal casting Methods 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- QYEXBYZXHDUPRC-UHFFFAOYSA-N B#[Ti]#B Chemical compound B#[Ti]#B QYEXBYZXHDUPRC-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 229920000388 Polyphosphate Polymers 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910033181 TiB2 Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- SMZOGRDCAXLAAR-UHFFFAOYSA-N aluminium isopropoxide Chemical compound [Al+3].CC(C)[O-].CC(C)[O-].CC(C)[O-] SMZOGRDCAXLAAR-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 150000001642 boronic acid derivatives Chemical class 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 238000005524 ceramic coating Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- UQGFMSUEHSUPRD-UHFFFAOYSA-N disodium;3,7-dioxido-2,4,6,8,9-pentaoxa-1,3,5,7-tetraborabicyclo[3.3.1]nonane Chemical compound [Na+].[Na+].O1B([O-])OB2OB([O-])OB1O2 UQGFMSUEHSUPRD-UHFFFAOYSA-N 0.000 description 1
- 239000002612 dispersion medium Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 150000002148 esters Chemical group 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
- 239000000391 magnesium silicate Substances 0.000 description 1
- 229910052919 magnesium silicate Inorganic materials 0.000 description 1
- 235000019792 magnesium silicate Nutrition 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 239000001205 polyphosphate Substances 0.000 description 1
- 235000011176 polyphosphates Nutrition 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000003678 scratch resistant effect Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- 239000011701 zinc Substances 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
- 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
-
- 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
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2913—Rod, strand, filament or fiber
- Y10T428/2916—Rod, strand, filament or fiber including boron or compound thereof [not as steel]
-
- 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
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31678—Of metal
-
- 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
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
Definitions
- the present invention relates to a hydrous sizing agent for producing a BN-containing coating on a substrate, a process for producing such a sizing, a coated body of a substrate and a coating applied thereon, which has been prepared from the sizing, and the use of the coated body, for example in the form of casting tables, runners and holding containers, in the field of foundry applications, in particular light metal casting applications.
- the work equipment and apparatus used in foundries are typically provided with a coating to keep these equipment and devices resistant to highly corrosive metal melts, such as aluminum melts, at temperatures in the range of 600 to 950 0 C to protect.
- a coating for the preparation of such coatings usually based on BN slurries in water, optionally with inorganic or organic binders are used.
- the binders used are, for example, alumina, bentonite, phosphates and silica.
- these sizes have the disadvantage that only powdery layers or layers of low layer thickness can be applied without cracking and that the layers tend to flake off and therefore have only a limited service life.
- a further disadvantage is that coatings produced from these sizes are not or only limitedly resistant to abrasion in the cold state, so that it is easy to damage the coatings, for example when cleaning with metallic objects such as pliers and iron bars. If the coating is not abrasion-resistant and scratch-resistant, it is easily destroyed.
- DE 101 27 494 B4 describes a high-temperature-stable inorganic layer produced from a ceramic offset of boron nitride, at least one of ceramic Nanoparticles, inorganic binder system and at least one solvent, such as water.
- EP 1 386 983 B1 describes a ceramic coating produced from a mixture of boron nitride, at least one inorganic binder having an average particle size in the nanometer range and at least one solvent and / or water by applying the mixture to a metallic or ceramic surface and baking the mixture ,
- DE 103 26 769 B3 describes permanent BN mold release layers for the die casting of non-ferrous metals and also sizing agents for their production, wherein refractory nanoscale binders are used as binding phase for boron nitride.
- suspensions of SiO 2 -based sol-gel binder and BN powder are applied to metal or inorganic non-metal surfaces and the resulting coatings dried and thermally densified.
- the binder system transforms into a glassy matrix, which gives the resulting ceramic layer mechanical stability.
- BN hardcoats and release coatings are not applicable to metal foundry applications because these layers require careful surface preparation and high film layup uniformity, which is not feasible under foundry conditions. Ebeso also uneven substrates must be coated in foundries, which is also not possible with the known from the aforementioned patents sizing. With the sizes according to these patents, just as with the foundry shades usually used in foundries, only layers of limited layer thickness can be applied without defects, dried and baked. These layers continue to have only a limited lifespan and are only limited abrasion and scratch resistance even when cold.
- the invention is therefore based on the object of providing a BN-containing size, with which thick coatings having a long service life can be produced free of cracks, the coatings not being used for the removal of tend to crack and their susceptibility to cracking, especially when used in foundry applications, lower and their abrasion resistance in the cold state is higher than in the known from the prior art coatings for foundry applications.
- a size for producing a BN-containing coating on a substrate according to claim 1 a method for producing such a size according to claim 20, a coated body comprising a substrate with a coating applied thereto according to claim 21 , a method for producing such a coated body according to claim 25 and the use of a coated body according to claim 29.
- Advantageous or particularly expedient embodiments of the subject of the application are specified in the subclaims.
- the coatings prepared from the sizes according to the invention are flexible for a long time at the usual application temperatures, which property is referred to herein as "hot flexibility".
- hot flexibility can not be observed in the coatings known from the prior art.
- the formation of cracks in the coatings due to different expansion coefficients between substrate and coating material can be prevented or any cracks that have occurred can be healed again, so that the coatings according to the invention have a self-healing property.
- the coatings produced according to the invention in use also have a significantly lower tendency to chip off, so that coatings with a significantly longer service life can be achieved.
- the coatings can also be heated quickly from room temperature to the usual application temperatures of 600 to 950 0 C.
- the coatings produced according to the invention are abrasion-resistant even when cold, which is the case with layers which are obtained from conventional foundries. is not the case. This reduces the risk of damage to the coatings when cleaning with tools, and the equipment and devices provided with such a coating are reusable without repair for a long time.
- thick layers can be produced free of cracks with the sizes according to the invention, the possible layer thickness being significantly higher than in the case of the coatings known in the prior art.
- the production of thick layers also makes it possible to fill and close any cracks and asperities in the substrate.
- defects in the equipment and tools can be filled without causing cracks during subsequent drying.
- cracks which have formed can be sealed with the sizes according to the invention.
- Another advantage of such thick layers is their longer lifetime, since their wear, even with abrasive wear, a higher layer thickness is available.
- the sizes according to the invention can also be applied to unclean substrates without expensive surface pretreatment, which is not possible with sizes according to the patent specifications mentioned above.
- An additional surprising advantage of the present invention produced coatings is that Vietnameseoxi- datlonsbe running substrates, such as metal or graphite, can be effectively protected against corrosion by a decomposition of the nen enthalte- is water-insoluble boron compound at temperatures from 600 0 C. Such a decomposition of the water-insoluble boron compound obviously proceeds via the consumption of oxygen, so that oxygen can not reach the surface of the substrate during the decomposition of the boron-containing compound in the coating.
- FIG. 1 is a graph of an abrasion test in which the abrasion resistance of a coating of a size according to the invention according to Example 3 was compared with commercially available coatings. Detailed description of the invention
- the invention thus provides a water-containing size for producing a BN-containing coating on a substrate, comprising, based on the solids content of the size, a) 45-90% by weight BN, b) 3-25% by weight boehmite Nanoparticles, c) 0.5-5% by weight of at least one borate, d) 2-30% by weight of at least one water-insoluble boron compound other than components a) and c), e) 2-30% by weight. -% of an organic compound, wherein the solids content of the size is 15-60 wt .-%.
- Water or alcohols such as ethanol, or water / alcohol mixtures can be used as the solvent or dispersion medium for the water-containing sizes according to the invention.
- ethanol e.g., ethanol
- water / alcohol mixtures e.g., water / alcohol mixtures
- the solids content of the size is preferably 20-40% by weight, more preferably 25-35% by weight.
- the BN content is preferably 45-85 wt.%, More preferably 45-75 wt.%
- the content of boehmite nanoparticles is preferably 5-20 wt.%, More preferably 10-18 Wt .-%
- the content of borate preferably 1 -4 wt .-%, more preferably 1 - 3 wt .-%
- the content of the water-insoluble boron compound preferably 5-25 wt .-%, more preferably 5-20 wt. %
- the content of an organic compound is preferably 3-20% by weight, more preferably 3-15% by weight.
- the size according to the invention comprises at least one of the following components: f) up to 2% by weight, preferably up to 1% by weight, more preferably up to 0.5% by weight % Boric acid, g) up to 15% by weight, preferably 0.5-10% by weight, most preferably 1 -8% by weight of at least one hard material selected from oxides, carbides and nitrides, h) up to 15% by weight, preferably 0.5-10% by weight, more preferably 1-8% by weight of at least one metal powder.
- the BN of component a) is preferably used as BN powder having an average particle size of 1 to 30 ⁇ m, more preferably 2 to 15 ⁇ m. It is also possible to use BN agglomerates having a mean agglomerate size of 20-100 ⁇ m, preferably 20-50 ⁇ m. Likewise, mixtures of both forms are possible.
- the BN used may further contain up to 10% by weight of various impurities and additives. In particular, mention may be made of boric acid, boron trioxide, carbon, alkali or alkaline earth borates. However, it is preferred that as pure, washed out BN with a purity of at least 98%, preferably 99%, is used.
- the boehmite nanoparticles used in the size according to the invention preferably have an average particle size of 1-100 nm, more preferably 1-40 nm and particularly preferably 2-20 nm.
- Commercially available boehmite powder can be used, for example as described by Sasol in US Pat Qualities Disperal or Dispal sold, preferably one with the product name Disperal P2 is used.
- the borate c) is preferably selected from the group consisting of lithium borate, potassium borate, sodium borate, calcium borate and borax, with particular preference being given to borax.
- the borate may also be present as a production-related impurity in the BN powder.
- the water-insoluble boron compound d) is preferably selected from the group consisting of boron carbide (B 4 C), metal borides and elemental boron. These boron compounds are oxidized during normal use of the sizings with atmospheric oxygen to boron oxide, in particular boron carbide is preferred. Examples of suitable metal borides are TiB 2 , ZrB 2 and CaB 6 .
- Suitable organic compounds e) are compounds which form a liquid or viscous phase when the sizes are used as intended and burn out at relatively high temperatures, leaving behind pores.
- Such organic compounds are preferably selected from synthetic polymers, such as thermoplastics, natural polymers, such as celluloses and cellulose derivatives, waxes, oils and polyphosphate esters group are selected. It is likewise possible to use water-based paints in the form of a suspension or emulsion having a fine dispersion distribution, preferably with a particle size or drop size of ⁇ 50 ⁇ m. Preference is given to low-melting compounds and non-water-soluble compounds. Water-soluble compounds should not crystallize out. Particularly preferred as the organic compound, a polyvinyl butyral (PVB) is used.
- PVB polyvinyl butyral
- the optionally contained hard materials g) are preferably selected from the group consisting of Al 2 O 3 , ZrO 2 , TiO 2 and SiC. These additional hard materials increase the abrasion resistance in the cold state of the coatings produced from the sizes. Although TiO 2 has the lowest hardness among the latter substances, it is particularly suitable when using the size under oxidizing conditions.
- the optionally contained metal powder h) is preferably added when the sizes according to the invention are provided for coating metallic substrates.
- the metal powders are selected from the group of metals Al, Mg, Si, Zr, Sn, Zn, mixtures or alloys thereof, which are capable of dissolving iron from metallic substrates.
- mixed crystals or intermetallic phases are formed at the interface between substrate and coating.
- the oxidation products of these phases form a protective film, thereby improving the oxidation resistance of the substrate.
- the metal powder h) from the group of light metals having a melting point below 800 0 C, more preferably selected from Al, Mg, their mixtures and alloys.
- the invention likewise provides a process for preparing a water-containing size according to the invention, comprising the steps of i) producing a boehmite sol in an aqueous medium, ii) adding the remaining constituents with simultaneous homogenization to obtain the size.
- boehmite powder qualities with particle sizes in the nanometer range can be used to produce the boehmite sol, while for example, the above-mentioned, commercially available boehmite Sasol.
- the boehmite powder are in an aqueous medium, preferably water, stirred, which was further preferably preheated, preferably Alternatively, to temperatures above 80 0 C.
- the preparation of a boehmite can sols about Alkoxidrouten according to Yoldas process or on the use of aluminum salts and addition a base done. After homogenization, the dispersion is usually peptized by acid addition and converted to a sol.
- solids concentrations in the sol of up to 20% by weight of boehmite, preferably 5-12% by weight, can be adjusted.
- the boehmite sol prepared as above serves as a dispersing medium into which the remaining constituents of the size are introduced by portioned addition of the powder components with simultaneous homogenization.
- the homogenization can be carried out by means of customary stirring devices, such as a blade stirrer.
- the remaining components are added in the order of 1) water-soluble ingredients, 2) fine powders, and 3) coarse powders.
- the homogenization can be carried out in a ball mill, in an attritor, with an Ultraturrax or with the aid of other dispersing or grinding aggregates.
- the invention furthermore relates to a coated body comprising a substrate with a coating applied thereto, the coating having been produced from a size according to the invention.
- the substrate may be a metallic, ceramic or other inorganic (e.g., graphite) substrate.
- the substrate can be in the form of any shaped article or shaped article, a film, a fabric or a fiber.
- the coating provided according to the invention preferably has a thickness of 5-2,000 ⁇ m, more preferably 15-1,000 ⁇ m, particularly preferably 30-500 ⁇ m, these layer thicknesses in each case being to be understood as average layer thicknesses.
- the achievement of defect-free coatings of this thickness has hitherto not been possible in the prior art, in particular on metallic or dense substrates. On the contrary, the layer thicknesses applied defect-free according to the prior art are usually 20-150 ⁇ m.
- the invention also provides a process for producing a coated body as described above comprising the steps
- the application of the size can be carried out at room temperature or at substrate temperatures up to 300 ° C.
- the substrate can be pretreated with a primer.
- the drying of the still wet coating can be effected at room temperature, but preferably at temperatures of 80- 100 0 C.
- the firing according to step 3) can be carried out in situ when using the coated body in a foundry application, the heat being supplied either by contact with molten metals or hot moldings or by radiation and / or convection.
- the input can burn well in advance in a separate process step at temperatures of 180-800 0 C take place, preferably at temperatures of 470 ° C or higher, in particular 500 0 C or above.
- the function and mode of action of the individual components of the size according to the invention in the formation of coatings can be explained as follows.
- the coatings obtainable according to the invention are hot-flexible and self-healing. This can be explained by the fact that there is always a liquid or viscous phase is when passing through the entire temperature range of from room temperature to the tem- temperature of about 750 0 C in the sizing or the coating is available, which ensures that no cracks or that any cracks that may occur are closed again.
- a body coated according to the invention is particularly suitable in the field of foundry applications, in particular light-metal foundry applications.
- the coated body is a casting table, a runner or a container for keeping or transporting molten metal.
- the sizes according to the invention can furthermore be used in an inverse coating process.
- a coating is applied to a sand mold using a sizing according to the invention.
- a metal casting preferably a metal having a melting point> 1200 0 C, wherein the sand mold is then removed.
- a metallic object for example a ladle, can be obtained, which is already provided with a coating baked in situ according to the invention.
- Example 1 illustrates the invention.
- sol from example 1 or example 2 having a solids content of boehmite of 7.1% by weight (corresponding to a content of 8.3 g of hydrated boehmite powder Disperal P2 or corresponding to 6 g of resulting Al 2 O 3 content) is used as dispersing medium submitted.
- the powdery components of the suspension are homogenized in the sol using an Ultraturrax.
- Ig boric acid, Ig borax, 4g boron carbide with an average particle size of 1 ⁇ m, 30 g boron nitride with an average particle size of 4 ⁇ m and 3.3 g of polyvinyl butyral are added in portions while the dispersing unit is running.
- Abrasion test (Taber abraser investigations) on coating according to the invention and comparative coatings
- flat-ground disks of hot-work steel 1.2343 (X38CrMoV5-l) were used as substrate.
- the BN suspensions (inventive size according to Example 3, commercially available sizing with aluminum oxide binder, Typl and Type 2, and with magnesium silicate binder) were applied by spraying, dried at 90 0 C for half an hour and at 750 0 C half Hour branded.
- the coated panels were cooled to room temperature and tested in a Taber Abraser test, 3N, Friction Rolls AT20D 1 -CS1 1 OF.
- the friction rollers AT20D1 - CS - 10F were cleaned before each test.
- the result of the investigations is shown in Fig. 1.
- the BN size with the lowest removal rates in the test is the size of Example 3 according to the invention. After 100 revolutions, almost the complete originally 50 to 90 .mu.m thick coating has already been removed in the comparative sizes, whereas in the case of the size of Example 3 according to the invention the coating is removed only very slowly and even after 500 revolutions still more than 40 microns thick coating is obtained.
- a GT value of 0 corresponds to the best detectable adhesive strength.
- the coating according to the invention according to Example 3 has reached the best value.
- Table 2 summarizes the GT values that can be determined.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Paints Or Removers (AREA)
- Lubricants (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200610041047 DE102006041047A1 (de) | 2006-09-01 | 2006-09-01 | Schlichte zur Herstellung einer BN-haltigen Beschichtung, Verfahren zu deren Herstellung, beschichteter Körper, dessen Herstellung und dessen Verwendung |
PCT/EP2007/007153 WO2008025448A1 (de) | 2006-09-01 | 2007-08-13 | Schlichte zur herstellung einer bn-haltigen beschichtung, verfahren zu deren herstellung, beschichteter körper, dessen herstellung und dessen verwendung |
Publications (2)
Publication Number | Publication Date |
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EP2057107A1 true EP2057107A1 (de) | 2009-05-13 |
EP2057107B1 EP2057107B1 (de) | 2011-07-06 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP20070801637 Not-in-force EP2057107B1 (de) | 2006-09-01 | 2007-08-13 | Schlichte zur herstellung einer bn-haltigen beschichtung, verfahren zu deren herstellung, beschichteter körper, dessen herstellung und dessen verwendung |
Country Status (5)
Country | Link |
---|---|
US (1) | US8128864B2 (de) |
EP (1) | EP2057107B1 (de) |
AT (1) | ATE515487T1 (de) |
DE (1) | DE102006041047A1 (de) |
WO (1) | WO2008025448A1 (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005050593A1 (de) | 2005-10-21 | 2007-04-26 | Esk Ceramics Gmbh & Co. Kg | Dauerhafte siliciumnitridhaltige Hartbeschichtung |
DE102007053284A1 (de) * | 2007-11-08 | 2009-05-20 | Esk Ceramics Gmbh & Co. Kg | Fest haftende siliciumnitridhaltige Trennschicht |
DE102011078066A1 (de) * | 2011-06-24 | 2012-12-27 | Oskar Frech Gmbh + Co. Kg | Gießtechnisches Bauteil und Verfahren zum Aufbringen einer Korrosionsschutzschicht |
US20140239549A1 (en) * | 2011-09-28 | 2014-08-28 | Toyota Jidosha Kabushiki Kaisha | Casting member, casting method, and method of manufacturing lubricant used for casting |
CN105567075B (zh) * | 2016-02-04 | 2018-07-24 | 宁波格莱美厨具有限公司 | 一种不粘锅用抗菌杂化涂层及其制备方法 |
WO2018119275A1 (en) * | 2016-12-23 | 2018-06-28 | Saint-Gobain Abrasives, Inc. | Coated abrasives having a performance enhancing composition |
CN113178545A (zh) * | 2021-04-23 | 2021-07-27 | 中南大学 | 一种金属锂/纳米h-BN粉膜层的构造及其制备方法和应用 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
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DE10256267A1 (de) * | 2002-12-03 | 2004-06-24 | Degussa Ag | Dispersion, Streichfarbe und Aufnahmemedium |
DE10326769B3 (de) * | 2003-06-13 | 2004-11-11 | Esk Ceramics Gmbh & Co. Kg | Dauerhafte BN-Formtrennschichten für das Druckgießen von Nichteisenmetallen |
-
2006
- 2006-09-01 DE DE200610041047 patent/DE102006041047A1/de not_active Ceased
-
2007
- 2007-08-13 US US12/310,496 patent/US8128864B2/en not_active Expired - Fee Related
- 2007-08-13 AT AT07801637T patent/ATE515487T1/de active
- 2007-08-13 WO PCT/EP2007/007153 patent/WO2008025448A1/de active Application Filing
- 2007-08-13 EP EP20070801637 patent/EP2057107B1/de not_active Not-in-force
Non-Patent Citations (1)
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See references of WO2008025448A1 * |
Also Published As
Publication number | Publication date |
---|---|
US8128864B2 (en) | 2012-03-06 |
EP2057107B1 (de) | 2011-07-06 |
DE102006041047A1 (de) | 2008-03-20 |
WO2008025448A1 (de) | 2008-03-06 |
ATE515487T1 (de) | 2011-07-15 |
US20090236780A1 (en) | 2009-09-24 |
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