CN1884398A - Alumina insulating coating and preparation method thereof - Google Patents
Alumina insulating coating and preparation method thereof Download PDFInfo
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- CN1884398A CN1884398A CN 200510040770 CN200510040770A CN1884398A CN 1884398 A CN1884398 A CN 1884398A CN 200510040770 CN200510040770 CN 200510040770 CN 200510040770 A CN200510040770 A CN 200510040770A CN 1884398 A CN1884398 A CN 1884398A
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- 239000011248 coating agent Substances 0.000 title claims abstract description 73
- 238000000576 coating method Methods 0.000 title claims abstract description 73
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- 229910001593 boehmite Inorganic materials 0.000 claims abstract description 28
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 claims abstract description 28
- 239000002245 particle Substances 0.000 claims abstract description 20
- 239000000843 powder Substances 0.000 claims abstract description 19
- 150000007522 mineralic acids Chemical class 0.000 claims abstract description 18
- 239000002131 composite material Substances 0.000 claims abstract description 17
- -1 inorganic acid salt Chemical class 0.000 claims abstract description 15
- 239000000758 substrate Substances 0.000 claims abstract description 13
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000000498 ball milling Methods 0.000 claims abstract description 5
- 238000003980 solgel method Methods 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 18
- 239000004570 mortar (masonry) Substances 0.000 claims description 15
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 14
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 13
- 150000007524 organic acids Chemical class 0.000 claims description 10
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 9
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 9
- 239000011247 coating layer Substances 0.000 claims description 8
- 238000005507 spraying Methods 0.000 claims description 8
- ODIGIKRIUKFKHP-UHFFFAOYSA-N (n-propan-2-yloxycarbonylanilino) acetate Chemical compound CC(C)OC(=O)N(OC(C)=O)C1=CC=CC=C1 ODIGIKRIUKFKHP-UHFFFAOYSA-N 0.000 claims description 7
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 7
- 238000007598 dipping method Methods 0.000 claims description 7
- 239000011268 mixed slurry Substances 0.000 claims description 7
- 229910017604 nitric acid Inorganic materials 0.000 claims description 7
- 238000004528 spin coating Methods 0.000 claims description 7
- 229910006636 γ-AlOOH Inorganic materials 0.000 claims description 7
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 6
- 235000006408 oxalic acid Nutrition 0.000 claims description 6
- BNGXYYYYKUGPPF-UHFFFAOYSA-M (3-methylphenyl)methyl-triphenylphosphanium;chloride Chemical compound [Cl-].CC1=CC=CC(C[P+](C=2C=CC=CC=2)(C=2C=CC=CC=2)C=2C=CC=CC=2)=C1 BNGXYYYYKUGPPF-UHFFFAOYSA-M 0.000 claims description 3
- 239000004411 aluminium Substances 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical group [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 3
- 239000010410 layer Substances 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 2
- 238000000227 grinding Methods 0.000 claims description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 2
- 239000011707 mineral Substances 0.000 claims description 2
- 238000007669 thermal treatment Methods 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 abstract description 10
- 230000015556 catabolic process Effects 0.000 abstract description 8
- 238000009413 insulation Methods 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 6
- 239000002002 slurry Substances 0.000 abstract description 4
- 238000001035 drying Methods 0.000 abstract 1
- 238000002156 mixing Methods 0.000 abstract 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000005498 polishing Methods 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000007750 plasma spraying Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 208000037656 Respiratory Sounds Diseases 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- ZUGAOYSWHHGDJY-UHFFFAOYSA-K 5-hydroxy-2,8,9-trioxa-1-aluminabicyclo[3.3.2]decane-3,7,10-trione Chemical compound [Al+3].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O ZUGAOYSWHHGDJY-UHFFFAOYSA-K 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- HDYRYUINDGQKMC-UHFFFAOYSA-M acetyloxyaluminum;dihydrate Chemical group O.O.CC(=O)O[Al] HDYRYUINDGQKMC-UHFFFAOYSA-M 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229940009827 aluminum acetate Drugs 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 235000006708 antioxidants Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002887 superconductor Substances 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention discloses an alumina insulating coating and a preparation method thereof. The coating comprises a substrate coated with an alumina coating, particularly an alumina coating with the thickness of 5-30 μm, and 2-8 layers of alpha-Al with the particle size of 20-150 nm2O3The product of the particles and boehmite sol at high temperature; the method comprises a sol-gel method, and particularly comprises the following steps: (1) nano-scale alpha-Al is added2O3Mixing the powder with the aqueous boehmite sol and the inorganic acid or inorganic acid salt or organic acid salt according to the proportion of 1-20: 100: 0.1-5, carrying out ball milling for 5-10 hours, standing for 5-24 hours to obtain composite slurry, coating the substrate with the composite slurry, drying at 80-120 ℃ for 10-30 minutes, carrying out heat treatment at 400-700 ℃ for 5-20 minutes, and (3) repeating the step for 2-8 times to obtain the aluminum oxide insulating coating. It has higher breakdown voltage and direct current resistance, and can be widely used in the field of high-voltage-resistant electric insulation.
Description
Technical field the present invention relates to a kind of insulating coating and method for making, especially alumina insulation coating and its preparation method.
The background technology alumina insulating coating is high temperature resistant because of having, acid-alkali-corrosive-resisting, wear-resisting, insulation strength advantages of higher, has a wide range of applications in fields such as nuclear energy, metallurgy, mines.At present, people are in order to obtain it, some effort have been done, once disclosed as " Dalian Railway University's journal " the 21st volume the 2nd interim " research of plasma spraying ceramic coat performance " literary composition of publishing in June, 2000 and a kind ofly aluminum oxide to be sprayed on No. 45 the method on the steel with plasma spraying, the thickness of this aluminum oxide coating layer is 40～90 microns.But this aluminum oxide coating layer and its spraying method all exist weak point, at first, aluminum oxide coating layer is stratiform to be piled up, and bonding strength is low, and has a large amount of pores in the coating, cause coating loose, thereby cause its dielectric breakdown strength lower, be difficult to as high performance insulating coating; Secondly, plasma spraying method one is to the having relatively high expectations of equipment, the 2nd, be difficult for grasp as the spray parameters of the key factor that influence coating quality, and the 3rd, preparation cycle is also longer, is unsuitable for large-scale industrial production.
The summary of the invention the technical problem to be solved in the present invention is for overcoming weak point of the prior art, provides a kind of and can be used under the comparatively high temps, easy to use and alumina insulation coating and its preparation method that insulating property are good.
Alumina insulating coating comprises that the thickness that is covered with aluminum oxide coating layer, particularly said aluminum oxide coating layer in the substrate is 5～30 μ m, and its particle diameter by 2～8 layers is α-Al of 20～150nm
2O
3Particle and boehmite sol product at high temperature consists of.
The preparation method of alumina insulating coating comprises sol-gel process, and particularly it is finished according to the following steps: (1), with nanometer alpha-Al
2O
3Powder and water-based boehmite sol and inorganic acid or inorganic acid salt or organic acid or acylate are according to 1～20: 100: 0.1～5 ratio is mixed mutually, its ball milling was placed after 5～10 hours obtained composite mortar in 5～24 hours again; (2), use the composite mortar coated substrate, again with its in 80～120 ℃ lower dry 10～30 minutes, afterwards, with it in 400～700 ℃ of lower heat treatments 5～20 minutes; (3), repeat the step 2 of (2)～8 times, make alumina insulating coating.
As the preparation method's of alumina insulating coating further improvement, described nanometer alpha-Al
2O
3The particle diameter of powder is 20～150nm; The composition of described water-based boehmite sol is that γ-AlOOH, concentration are that 1～10wt%, pH value are 2～5; Described inorganic acid is nitric acid or sulfuric acid or hydrochloric acid; Described inorganic acid salt is aluminum sulfate or aluminum nitrate or aluminium chloride; Described organic acid is acetic acid or oxalic acid or citric acid; Described acylate is aluminum acetate or oxalic acid aluminium or aluminium citrate; Described ball milling is to place ball grinder to mix and grinding at planetary ball mill mixed slurry; Describedly be applied to dipping or spin coating or spraying.
Beneficial effect with respect to prior art is, one, to the alumina insulating coating that makes and its section use respectively field emission scanning electron microscope, x-ray diffractometer and coating thickness tester characterize with test after, from the stereoscan photograph, X-ray diffracting spectrum and the one-tenth-value thickness 1/10 that obtain as can be known, insulating coating densification, flawless, it is α-Al of 20～150nm by particle diameter
2O
3Particle consists of with being distributed in wherein equably by boehmite sol product at high temperature, and its thickness is 5～30 μ m; They are two years old, under different temperature, use automatic high pressure puncture device and Insulation Resistance Tester to carry out the test of industrial frequency AC breakdown voltage and D.C. isolation resistance to the alumina insulating coating that makes, wherein, the thickness of coating is 21.5 μ m, and the area of electrode is 0.25cm
2, result such as following table:
| Temperature | Unit for electrical property parameters | |
| Industrial frequency AC breakdown voltage (V) | D.C. resistance (M Ω) | |
| 100 ℃ 200 ℃ 300 ℃ 400 ℃ | 1,500 1,400 1,200 1100 | 3,100 10,000 2,700 550 |
By finding out that coating has higher breakdown voltage and D.C. resistance in the table, its insulating properties are good; Its three, select nanometer alpha-Al
2O
3Powder and water-based boehmite sol and inorganic acid or inorganic acid salt or organic acid or acylate both can be brought into play nanometer α-Al as the raw material of preparation insulating coating
2O
3Ceramic particle: 1) stop the cracking of coating in dry and heat treatment process, 2) can obtain thicker coating, 3) packing density between the raising particle, thereby improve the density of coating, 4) making the principal phase of coating is alpha-phase aluminum oxide, and α has the characteristic of very good insulating properties mutually in numerous alumina phases, can bring into play again the water-based boehmite sol: 1) as a kind of high temperature " binding agent ", Nano Ceramic Particles in the system closely is bonded together, 2) boehmite is a kind of presoma of aluminium oxide, in heat treatment process, can change aluminium oxide fully into, with the aluminium oxide ceramics particle that adds be same substance, properly alleviated the characteristic of not mating the crackle that causes in the coating owing to material thermal expansion coefficient, also can bring into play inorganic acid or inorganic acid salt or organic acid or acylate: the time that 1) can regulate and control the Boehmite Sol gelling, thereby the composite mortar that acquisition has certain viscosity, be convenient to apply construction, 2) because the interpolation of these materials, amount of charge increases in the system, utilize electrostatic stabilization mechanism that nano particle is uniformly dispersed in slurry system, 3) this additive at high temperature fully decomposition or generation and aluminium oxide with the material of phase, can residual any other materials that affect the coating insulation performance, 4) these additives can have faint corrosion to matrix, oxidation, can form in metal substrate surface the dense oxidation film of thin layer, this film and aluminum oxide coating layer mate, and have improved the characteristic of the adhesive force of coating.Thereby properly solved the thickness and the contradiction that matches and do not cause crackle to produce owing to material thermal expansion coefficient of primary coating, only needed less coating number of times just can obtain the insulating coating of desired thickness; Its four, through the test of Other Instruments, insulating coating also has the performance of higher wear-resistant, corrosion-resistant, anti-oxidant, thermal resistance, this is convenient to use on a large scale in more wide Application Areas; Its five, preparation technology is simple to operation, and is not high to equipment requirements, is suitable for large-scale industrial production.
Description of drawings is described in further detail optimal way of the present invention below in conjunction with accompanying drawing.
Fig. 1 has provided utilization (a) water-based boehmite sol, (b) 10 parts of nanometer alpha-Al
2O
3Powder and 100 parts of water-based boehmite sols, and (c) 10 parts of nanometer alpha-Al
2O
3The single application thickness of the prepared coating of slurry of powder and 100 parts of water-based boehmite sols and 2 parts of inorganic acids or inorganic acid salt or organic acid or acylate.As can be seen from Figure, through behind the primary coating, the thickness of coating (c) is about 5 μ m, and is maximum in three samples;
Fig. 2 is the photo of taking behind the pattern to the surface of observing coating through the insulating coating of twice coating with the Sirion of U.S. FEI Co. 200 FEG type field emission scanning electron microscopes and section, wherein, (a) figure is the surface topography map of insulating coating, and (b) figure is the cross-section morphology figure of insulating coating;
Fig. 3 is that wherein, abscissa is 2 θ angles to the phase figure of insulating coating with the Dutch Philips X ' pert-PRO of company type x-ray diffractometer differentiation coating, and ordinate is relative intensity, can find out thus, and the principal phase of coating is α-Al
2O
3Phase structure also has on a small quantity by boehmite sol through the formed γ-Al of heat treatment
2O
3Phase structure;
Fig. 4 is the interchange dielectric breakdown voltage that insulating coating is used Changzhou small and special electric machine head factory CW2672H type automatic high pressure puncture device to measure to obtain after its industrial frequency AC voltage breakdown and the graph of a relation of temperature, wherein, X-coordinate is a temperature, and ordinate zou is a voltage breakdown, and coat-thickness is 21.5 μ m.
The specific embodiment at first makes or buys from market α-Al that particle diameter is 20～150nm with conventional method
2O
3Powder, water-based boehmite sol and inorganic acid, inorganic acid salt, organic acid, acylate.Then:
1), with nanometer alpha-Al embodiment 1: finish according to the following steps preparation:
2O
3Powder mixes according to 1: 100: 0.1 ratio with inorganic acid mutually with the water-based boehmite sol, wherein, and nanometer alpha-Al
2O
3The particle diameter of powder is 150nm, the composition of water-based boehmite sol is that γ-AlOOH, concentration are that 1wt%, pH value are 2, inorganic acid is nitric acid (or sulfuric acid or hydrochloric acid), again mixed slurry is placed ball grinder planetary ball mill mix with grind 5 hours after place and obtained composite mortar in 5 hours; 2), to copper substrate polishing, deoil and clean after apply thereon with composite mortar, the mode of coating is spraying (or dipping or spin coating), again with its in 80 ℃ lower dry 30 minutes, afterwards, with it in 400 ℃ of lower heat treatments 20 minutes; 3), repeat 2) step 2 time, make such as Fig. 2, Fig. 3 and alumina insulating coating shown in Figure 4.
1), with nanometer alpha-Al embodiment 2: finish according to the following steps preparation:
2O
3Powder mixes according to 5: 100: 1.5 ratio with inorganic acid mutually with the water-based boehmite sol, wherein, and nanometer alpha-Al
2O
3The particle diameter of powder is 110nm, the composition of water-based boehmite sol is that γ-AlOOH, concentration are that 3wt%, pH value are 3, inorganic acid is nitric acid (or sulfuric acid or hydrochloric acid), again mixed slurry is placed ball grinder planetary ball mill mix with grind 6 hours after place and obtained composite mortar in 10 hours; 2), to copper substrate polishing, deoil and clean after apply thereon with composite mortar, the mode of coating is spraying (or dipping or spin coating), again with its in 90 ℃ lower dry 25 minutes, afterwards, with it in 480 ℃ of lower heat treatments 17 minutes; 3), repeat 2) step 4 time, make and be similar to Fig. 2 and alumina insulating coating as shown in Figure 3, Figure 4.
1), with nanometer alpha-Al embodiment 3: finish according to the following steps preparation:
2O
3Powder mixes according to 10: 100: 3 ratio with inorganic acid mutually with the water-based boehmite sol, wherein, and nanometer alpha-Al
2O
3The particle diameter of powder is 85nm, the composition of water-based boehmite sol is that γ-AlOOH, concentration are that 5wt%, pH value are 3.5, inorganic acid is nitric acid (or sulfuric acid or hydrochloric acid), again mixed slurry is placed ball grinder planetary ball mill mix with grind 7.5 hours after place and obtained composite mortar in 15 hours; 2), to copper substrate polishing, deoil and clean after apply thereon with composite mortar, the mode of coating is spraying (or dipping or spin coating), again with its in 100 ℃ lower dry 20 minutes, afterwards, with it in 550 ℃ of lower heat treatments 13 minutes; 3), repeat 2) step 5 time, make and be similar to Fig. 2 and alumina insulating coating as shown in Figure 3, Figure 4.
1), with nanometer alpha-Al embodiment 4: finish according to the following steps preparation:
2O
3Powder mixes according to 15: 100: 4 ratio with inorganic acid mutually with the water-based boehmite sol, wherein, and nanometer alpha-Al
2O
3The particle diameter of powder is 55nm, the composition of water-based boehmite sol is that γ-AlOOH, concentration are that 8wt%, pH value are 4, inorganic acid is nitric acid (or sulfuric acid or hydrochloric acid), again mixed slurry is placed ball grinder planetary ball mill mix with grind 9 hours after place and obtained composite mortar in 20 hours; 2), to copper substrate polishing, deoil and clean after apply thereon with composite mortar, the mode of coating is spraying (or dipping or spin coating), again with its in 110 ℃ lower dry 15 minutes, afterwards, with it in 630 ℃ of lower heat treatments 9 minutes; 3), repeat 2) step 6 time, make and be similar to Fig. 2 and alumina insulating coating as shown in Figure 3, Figure 4.
1), with nanometer alpha-Al embodiment 5: finish according to the following steps preparation:
2O
3Powder mixes according to 20: 100: 5 ratio with inorganic acid mutually with the water-based boehmite sol, wherein, and nanometer alpha-Al
2O
3The particle diameter of powder is 20nm, the composition of water-based boehmite sol is that γ-AlOOH, concentration are that 10wt%, pH value are 5, inorganic acid is nitric acid (or sulfuric acid or hydrochloric acid), again mixed slurry is placed ball grinder planetary ball mill mix with grind 10 hours after place and obtained composite mortar in 24 hours; 2), to copper substrate polishing, deoil and clean after apply thereon with composite mortar, the mode of coating is spraying (or dipping or spin coating), again with its in 120 ℃ lower dry 10 minutes, afterwards, with it in 700 ℃ of lower heat treatments 5 minutes; 3), repeat 2) step 8 time, make and be similar to Fig. 2 and alumina insulating coating as shown in Figure 3, Figure 4.
Replace mineral acid with inorganic acid salt or organic acid or organic acid salt respectively again, wherein, inorganic acid salt is that Tai-Ace S 150 or aluminum nitrate or aluminum chloride, organic acid are that acetic acid or oxalic acid or citric acid, organic acid salt are Burow Solution or oxalic acid aluminium or Tiorco 677, and select for use semi-conductor or superconductor to be used as substrate again, repeat the foregoing description 1～5, make equally as or be similar to Fig. 2 and alumina insulating coating as shown in Figure 3, Figure 4.
Obviously, those skilled in the art can carry out various changes and modification to alumina insulation coating and its preparation method of the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1, a kind of alumina insulating coating comprises being covered with aluminum oxide coating layer in the substrate, and the thickness that it is characterized in that said aluminum oxide coating layer is 5～30 μ m, and its particle diameter by 2～8 layers is α-Al of 20～150nm
2O
3Particle and boehmite sol product at high temperature consists of.
2, the preparation method of alumina insulating coating according to claim 1 comprises sol-gel method, it is characterized in that finishing according to the following steps:
2.1, with nanometer alpha-Al
2O
3Powder and water-based boehmite sol and inorganic acid or inorganic acid salt or organic acid or acylate are according to 1～20: 100: 0.1～5 ratio is mixed mutually, its ball milling was placed after 5～10 hours obtained composite mortar in 5～24 hours again;
2.2, use the composite mortar coated substrate, again with its in 80～120 ℃ dry 10～30 minutes down, afterwards, with it in 400～700 ℃ of following thermal treatments 5～20 minutes;
2.3, repeat 2.2 step 2～8 time, make alumina insulating coating.
3, the preparation method of alumina insulating coating according to claim 2 is characterized in that nanometer alpha-Al
2O
3The particle diameter of powder is 20～150nm.
4, the preparation method of alumina insulating coating according to claim 2, the composition that it is characterized in that the water-based boehmite sol is that γ-AlOOH, concentration are that 1～10wt%, pH value are 2～5.
5, the preparation method of alumina insulating coating according to claim 2 is characterized in that mineral acid is nitric acid or sulfuric acid or hydrochloric acid.
6, the preparation method of alumina insulating coating according to claim 2 is characterized in that inorganic acid salt is Tai-Ace S 150 or aluminum nitrate or aluminum chloride.
7, the preparation method of alumina insulating coating according to claim 2 is characterized in that organic acid is acetic acid or oxalic acid or citric acid.
8, the preparation method of alumina insulating coating according to claim 2 is characterized in that organic acid salt is Burow Solution or oxalic acid aluminium or Tiorco 677.
9, the preparation method of alumina insulating coating according to claim 2 is characterized in that ball milling is to place ball grinder to mix and grinding mixed slurry on planetary ball mill.
10, the preparation method of alumina insulating coating according to claim 2 is characterized in that being applied to dipping or spin coating or spraying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510040770XA CN100457834C (en) | 2005-06-21 | 2005-06-21 | Alumina insulating coating and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510040770XA CN100457834C (en) | 2005-06-21 | 2005-06-21 | Alumina insulating coating and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN1884398A true CN1884398A (en) | 2006-12-27 |
| CN100457834C CN100457834C (en) | 2009-02-04 |
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| CNB200510040770XA Expired - Fee Related CN100457834C (en) | 2005-06-21 | 2005-06-21 | Alumina insulating coating and preparation method thereof |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103194741A (en) * | 2013-04-03 | 2013-07-10 | 苏州大学 | Alumina precursor solution, and preparation method and application thereof |
| CN104797662A (en) * | 2012-07-13 | 2015-07-22 | 哈佛学院 | Slips surface based on metal-containing compound |
| US9630224B2 (en) | 2012-07-13 | 2017-04-25 | President And Fellows Of Harvard College | Slippery liquid-infused porous surfaces having improved stability |
| CN106947931A (en) * | 2010-07-09 | 2017-07-14 | 芬兰国家技术研究中心股份公司 | Thermal spraying amorphous oxide coating completely |
| CN107488277A (en) * | 2017-09-06 | 2017-12-19 | 深圳市峰泳科技有限公司 | A kind of inorganic filler for loading heterogeneous granular and preparation method thereof |
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Assignee: Hefei Xingchen Electric Wire & Cable Co., Ltd. Assignor: Hefei Inst. of Matter Sciences, Chinese Academy of Sciences Contract fulfillment period: 2009.8.10 to 2014.8.10 contract change Contract record no.: 2009340000165 Denomination of invention: Alumina insulating coating and its preparation method Granted publication date: 20090204 License type: Exclusive license, exclusive permission Record date: 2009.8.12 |
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