CN1040671C - Thermophilic corrosion-resistance coating - Google Patents
Thermophilic corrosion-resistance coating Download PDFInfo
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- CN1040671C CN1040671C CN94112517A CN94112517A CN1040671C CN 1040671 C CN1040671 C CN 1040671C CN 94112517 A CN94112517 A CN 94112517A CN 94112517 A CN94112517 A CN 94112517A CN 1040671 C CN1040671 C CN 1040671C
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- Prior art keywords
- coating
- rare earth
- earth oxide
- chromium
- nickel
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- 239000011248 coating agent Substances 0.000 title claims description 78
- 238000000576 coating method Methods 0.000 title claims description 78
- 229910001404 rare earth metal oxide Inorganic materials 0.000 claims abstract description 31
- 239000011651 chromium Substances 0.000 claims abstract description 24
- 229910000951 Aluminide Inorganic materials 0.000 claims abstract description 22
- 238000002360 preparation method Methods 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 17
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 15
- 238000012545 processing Methods 0.000 claims abstract description 10
- 238000009792 diffusion process Methods 0.000 claims abstract description 9
- 238000007747 plating Methods 0.000 claims abstract description 9
- 150000001875 compounds Chemical class 0.000 claims description 18
- 239000002245 particle Substances 0.000 claims description 14
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical group [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 13
- 239000000843 powder Substances 0.000 claims description 12
- 241000080590 Niso Species 0.000 claims description 9
- 229910015372 FeAl Inorganic materials 0.000 claims description 7
- 239000003961 penetration enhancing agent Substances 0.000 claims description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims description 6
- 229910000311 lanthanide oxide Inorganic materials 0.000 claims description 6
- 239000013543 active substance Substances 0.000 claims description 5
- QRRWWGNBSQSBAM-UHFFFAOYSA-N alumane;chromium Chemical compound [AlH3].[Cr] QRRWWGNBSQSBAM-UHFFFAOYSA-N 0.000 claims description 5
- 238000006356 dehydrogenation reaction Methods 0.000 claims description 4
- 229910000480 nickel oxide Inorganic materials 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 20
- 238000005260 corrosion Methods 0.000 abstract description 10
- 229910000943 NiAl Inorganic materials 0.000 abstract description 9
- NPXOKRUENSOPAO-UHFFFAOYSA-N Raney nickel Chemical compound [Al].[Ni] NPXOKRUENSOPAO-UHFFFAOYSA-N 0.000 abstract description 9
- 238000005269 aluminizing Methods 0.000 abstract description 6
- 239000002131 composite material Substances 0.000 abstract description 3
- 239000011247 coating layer Substances 0.000 abstract 5
- 238000012805 post-processing Methods 0.000 abstract 1
- 230000007797 corrosion Effects 0.000 description 8
- 238000007254 oxidation reaction Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 230000003647 oxidation Effects 0.000 description 5
- 229910052761 rare earth metal Inorganic materials 0.000 description 5
- 229910052759 nickel Inorganic materials 0.000 description 4
- 230000003078 antioxidant effect Effects 0.000 description 3
- 230000004087 circulation Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 150000002910 rare earth metals Chemical class 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000012267 brine Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 208000020442 loss of weight Diseases 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 229910052776 Thorium Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000003064 anti-oxidating effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- 238000001513 hot isostatic pressing Methods 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000005468 ion implantation Methods 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 238000001755 magnetron sputter deposition Methods 0.000 description 1
- 238000005240 physical vapour deposition Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
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- Turbine Rotor Nozzle Sealing (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
The present invention relates to a high-temperature hot-corrosion resisting coating layer which is characterized in that the coating layer refers to a composite chromium containing aluminide coating layer which comprises dispersing rare earth oxide, namely an NiAl(Cr)-rare earth oxide coating layer. A preparation technology is mainly composed of the working procedures of the coelectrodeposition of Ni-rare earth oxide, chromium plating, vacuum thermal diffusion processing and post processing of an aluminizing surface. Compared with the prior art, the high-temperature hot-corrosion resistance of the coating layer obtained by the technology provided by the present invention is obviously enhanced.
Description
The present invention relates to the metallic surface chemical treatment method, a kind of composite coating and preparation technology thereof of containing disperse rare earth oxide particle who is used for resistance to high temperature corrosion promptly is provided.
The development of high-temperature protection coating and use start from middle fifties in this century, are initially simple diffusion coating aluminum coating, progressively develop on this basis later on and have played binary, ternary and multiple permeation aluminide coating.People also constantly deepen the understanding of the effect of coating component in the development coat preparing technology, and the particularly useful effect of rare earth element is as elements such as Hf, Y, Ce, Th, La.The coating preparation means that contain rare earth at present have: EB, PVD prepare the MCrAlY coating, magnetron sputtering prepares the MCrAlY coating, and PPS or LPPS prepare the MCrAlY coating, ion implantation rare earth element, the Al-RE co-permeating, Ni or Co and MCrAlY powdered alloy codeposition prepare MCrAlY infiltration layer etc.Adopt electronics or ion device to produce owing to contain the coating of rare earth, it is costly as to make it be difficult to large-scale promotion more.Though abroad the someone adopts Ni, Co and MCrAlY powdered alloy coelectrodeposition, then hot isostatic pressing, heat treated means prepare the MCrAlY coating again, the preparation technology of its MCrAlY fine powder is very complicated, cost is also higher, therefore also fails widespread usage.
The purpose of this invention is to provide a kind of preparation technology of the composite coating that contains disperse rare earth oxide particle of resistance to high temperature corrosion, it is with low cost, and technology is simple.
The objective of the invention is to realize by following proposal:
1. contain the preparation of the compound aluminide coating of disperse rare earth oxide
On the workpiece substrate of making by high-temperature material, realize the codeposition of nickel and rare earth oxide by the method for galvanic deposit, thereby acquisition contains the nickel-rare earth oxide coelectrodeposition layer of the rare earth oxide particle of small and dispersed carries out the thermodiffusion aluminising, finally prepares mutually and the compound aluminide coating of nickel aluminium-rare-earth oxide type that contain disperse rare-earth oxidation material based on β-nickel aluminium.
Above-mentioned preparation technology of coating flow process is seen Fig. 1
2. contain the preparation of the compound aluminium chromium dosed thing coating of disperse rare earth oxide
(1) make tiny rare earth oxide particle be suspended in the solution equably by suitable stirring, realize the codeposition of nickel and rare earth oxide with the method for galvanic deposit, thereby obtain to contain the nickel-rare earth oxide coelectrodeposition layer of small and dispersed rare earth oxide particle, carry out chromium plating then, on nickel-lanthanide oxide layer, prepare the thin chromium layer of one deck, folded more as above nickel-lanthanide oxide layer on the chromium layer at last, thus the coating of three layers or multilayered structure formed.
(2) above-mentioned coating is carried out High temperature diffusion under vacuum condition and handle, make the distribution of chromium be tending towards homogenizing, and obtain to contain the nickel-lanthanide oxide layer of chromium.
(3) coating that homogenizing is handled is carried out the thermodiffusion aluminising, finally prepares the compound aluminide coating that contains disperse rare earth oxide and the certain chromium content of tool.
Preparation technology's flow process of above-mentioned coating is seen Fig. 2.
Principal character of the present invention provided a kind of based on β-nickel aluminium the mutually and compound aluminide coating of nickel aluminium-rare-earth oxide compound that contain disperse rare earth oxide particle, its coating is the best with following four kinds of high temperature corrosion properties:
1.NiAl-CeO
2Compound aluminide coating
2.NiAl-Y
2O
3Compound aluminide coating
3.NiAl-Ca
2O
3Compound aluminide coating
4.NiAl-Gd
2O
3Compound aluminide coating
The preparation technology of above-mentioned coating is made up of following operation:
Sample surfaces cleans, the processing of powder high-temperature stable
Nickel-rare earth oxide coelectrodeposition
Aluminising
Surface aftertreatment (cleaning)
NiAl-CeO wherein
3Compound aluminide preparation technology of coating is to be made up of following technology:
(1) sample surfaces cleans; The processing of powder high-temperature stable,
(2) NiAl-CeO
2Coelectrodeposition
Solution composition:
NiSO
47H
2O 200～250g/l
NiCl
2 45～50g/l
H
3BO
3 30～35g/l
Dehydrogenation tensio-active agent 0.05～0.1g/l
PH 4.0～4.5
DK 2～4A/dm
2
T 50～55℃
t 40～60min
(3) aluminising
Penetration enhancer composition: FeAl powder+NH
4Cl (1%wt) aluminising mode pack cementation aluminizing temperature, time: 850 ℃ of-900 ℃/8-10h
1000 ℃ of-1100 ℃/0.5-1.5hNiAl-Y
2O
3(or Gd
2O
3) compound aluminide preparation technology is as follows: (1) sample surfaces cleans; Powder high-temperature stable processing (2) NiAl-Y
2O
3(Gd
2O
3) coelectrodeposition solution composition: NiSO
47H
2O 100～120g/lNa
4P
2O
460～65g/lNaHSO
31～2g/lNa
3C
6H
5O
72H
2O 55-60g/lC
6H
8O
7.H
2O 12-15g/lNaCl 25-30g/lNH
3H
2(28%) 30-50g/lpH 7.5-8.0T 35-40 ℃ of DK 1.5-2A/dm
2T 60-80min (3) aluminising penetration enhancer composition: FeAl powder+NH
4Cl (1%wt) aluminising mode: pack cementation aluminizing temperature: 900 ℃ of time: 8～10hNiAl-La
2O
3Compound aluminide preparation technology is as follows: (1) sample surfaces cleans, powder high-temperature stable processing (2) NiAl-La
2O
3Coelectrodeposition solution composition: NiSO
47H
2O 120-150g/lNH
4Cl 15-20g/lH
3BO
323-25g/l
PH 5.6-6.0
DK 2-3A/dm
2
t 60-80min
T 25-35℃
(3) aluminising
Penetration enhancer composition: FeAl powder+NH
4Cl (1%wt)
Aluminising mode: pack cementation aluminizing
Temperature: 900 ℃
Time: 8-10h
Feature of the present invention also is to provide a kind of compound aluminium chromium dosed thing coating that contains the disperse rare earth oxide, i.e. NiAl (Cr)-rare earth oxide coating.The preparation technology of above-mentioned coating is made up of following operation:
Sample surfaces cleans; The processing of powder high-temperature stable
Ni-rare earth oxide coelectrodeposition
Chromium plating
Vacuum heat diffusion treatment
Aluminising
Surface aftertreatment (cleaning)
Wherein the coelectrodeposition processing parameter is as follows:
Solution composition:
NiSO
4·7H
2O 200-250g/l
NiCl
2 45-50g/l
H
3BO
3 35-38g/l
Dehydrogenation tensio-active agent 0.05-0.1g/l
pH 4.0-4.5
DK 2-4A/dm
2
t 40-60min
T 50-55℃
The chrome-plated process parameter:
Plating bath:
Chromic anhydride Cr
2O
3200～250g/l sulfuric acid H
2SO
42.0 60～65 ℃ of current density 30～40A/dm of～2.5g/l temperature
2Vacuum heat diffusion treatment: 900～1000 ℃ of time 8～20h of temperature vacuum tightness 10
-2～10
-3Pa aluminising: penetration enhancer composition: FeAl powder+NH
4The best coelectrodeposition processing parameter of the compound aluminium chromium dosed thing of Cl (1%wt) the temperature 850-900 ℃/7-9h above-mentioned NiAl of time 1050-1100 ℃/0.5-1.5h (Cr) coating is: plating bath technology: NiSO
47H
2O 250g/lNiCl
250g/lH
3BO
338g/l dehydrogenation tensio-active agent 0.1g/lPH 4.3DK 2A/dm
250 ℃ of t 40min of T chrome-plated process parameter: plating bath: chromic anhydride Cr
2O
3250g/l sulfuric acid H
2SO
42.5g/l 65 ℃ of current density 35A/dm of temperature
2Vacuum heat diffusion treatment: 900 ℃ of time 8-10h of temperature
Vacuum tightness 10
-3Pa
Embodiment 1 one contains disperse CeO
2The NiAl-CeO of particle
2Compound aluminide coating and preparation method thereof.(low temperature)
(1) Ni-CeO
2The preparation technology of layer
By suitable stirring tiny rare earth oxide particle is suspended in the following plating bath equably, with the method Ni and the CeO of galvanic deposit
2Coelectrodeposition, thereby obtain to contain the Ni-CeO of tiny disperse rare earth oxide particle
2The coelectrodeposition layer.
Solution composition:
NiSO
4·7H
2O 250g/l
NiCl
2 50g/l
H
aBO
3 38g/l
Tensio-active agent 0.1g/l
PH 4.3
DK 2A/dm
2
T 50℃
t 40min
(2) aluminising:
At Ni-CeO
2Carrying out aluminising on the coelectrodeposition layer handles
Penetration enhancer composition: FeAl+NH
4Cl (1%wt)
Aluminising mode: pack cementation aluminizing
Temperature: 900 ℃
Time: 8h
Embodiment 2----contains disperse CeO
2The NiAl-CeO of particle
2
Compound aluminide coating (high temperature oozes type)
(1) Ni-CeO
2Preparation technology of coating is with embodiment 1
(2) alumetizing process:
Penetration enhancer composition: FeAl powder+NH
4Cl (1%wt)
Aluminising mode: pack cementation aluminizing
Temperature: 1050 ℃
Time: 45min
Embodiment 3 one contains disperse La
2O
3Compound aluminide coating (the NiAl-La of particle
2O
3) (1) coelectrodeposition technology NiSO
47H
2O 150g/lNH
4Cl
220g/lH
3BO
325g/lPH 5.6-6DK 2A/dm
225-35 ℃ of (2) alumetizing process of t 80minT contains disperse Y with embodiment 1 embodiment 4 one
2O
3(or Gd
2O
3) the compound aluminide coating (NiAl-Y of particle
2O
3) (1) coelectrodeposition technology: NiSO
47H
2O 120g/lNa
4P
2O
465g/lNaHSO
32g/lNa
3C
6HsO
72H
2O 60g/lC
6H
8O
7H
2O 15g/lNaCl 30g/lNH
3H
235 ℃ of DK 1.5A/dm of O (28%) 30-50g/lPH 7.5T
2T 80min (2) alumetizing process contains disperse CeO with embodiment 1 embodiment 5 one
2The preparation Ni-CeO of compound aluminium chromium dosed thing coating (1) deposition layer
2Preparation with embodiment 1 chromed processing condition be: CrO
3250g/lH
2SO
42.5g/lT 65 ℃
DK 35A/dm
2
t 10-20min
(2) vacuum DIFFUSION TREATMENT:
T 900℃
t 8-10h
Vacuum tightness 10
-3Pa
(3) alumetizing process is with embodiment 1
Experimental result by the coating that the foregoing description obtained is as follows:
1, the antioxidant property of coating: oxidation experiment carries out under 1100 ℃, every interval weighing sample weight about 20 hours, and the accumulation oxidization time is 200h, experimental result shows that the increasing weight of oxidation and the time of coating are parabola rule, i.e. Δ W
2(gain in weight)=Kp (para-curve constant) t (time).Kp value in the formula is more little, and anti-oxidation of coating is strong more.Kp=2.11～3.47 * 10 of simple NiAl coating
-11(g
2Cm
-4S
-1), NiAl-CeO
2The Kp=8.0 of compound coating～12.0 * 10
-12, NiAl-Y
2O
3Coating is Kp=6.0～10.0 * 10
-12, NiAl-La
2O
3The Kp=3.5 of coating～10.0 * 10
-12, NiAl-Gd
2O
3The Kp=2.7 of coating～7.3 * 10
-12From the Kp value as can be known, the simple aluminide coating of compound coating antioxidant property is significantly improved, and adds La
2O
3And Dd
2O
3The improvement effect more effective.
NiAl (Cr)-CeO
2The Kp=2.0 of coating～8.0 * 10
-12(g
2Cm
-4S
-1), its antioxidant property also has clear improvement.
2, the anti-cyclic oxidation performance of coating
NiAl-CeO
2(950 ℃/50min+ room temperature/10min), the loss of weight phenomenon do not occur, and simple NiAl coating just produces tangible loss of weight after about 50 circulations, the amount of peeling off of oxide film increases coating greatly in 100 circulation backs of experience.
NiAl-Y
2O
3(La
2O
3, Gd
2O
3) coating 1100 ℃ the experience 20 times the circulation after the spalling of oxide film total amounts be about 0.2～0.5mg/cm
2, and simple calorized coating is 1.1～1.5mg/cm
2
NiAl (Cr)-CeO
2The amount of peeling off of the oxide film of coating is about 0.3～0.6mg/cm
2, therefore, to add after the rare earth oxide, the oxide film adhesivity of coating strengthens, and the ability of anti-cyclic oxidation improves.
3, the hot corrosion resistance of coating
NiAl-CeO
2Coating adopts the Na at 900 ℃
2SO
4The method that corrodes survey its gain in weight variation in back in the fused salt is estimated.Gain in weight behind the compound coating brine corrosion 200h is about: 1.8～2.2mg/cm
2, and simple aluminide coating is about 3.0～5.0mg/cm
2
NiAl-Y
2O
3(La
2O
3, Gd
2O
3) at 850 ℃ Na
3SO
4+ 30wt% K
2SO
4The weightening finish of middle brine corrosion 100h is about 0.8～1.10mg/cm
2, simple NiAl coating is about 1.6mg/cm
2
NiAl (Cr)-CeO
2Coating is at 900 ℃ Na
2SO
4Gain in weight among the+25wt% NaCl behind the corrosion 100h is about 2.5～4.5mg/cm
2, simple coating is 5.5～7.0mg/cm
2
Therefore, the hot corrosion resistance of the simple aluminide coating of compound aluminide coating also increases.
Claims (2)
1. the preparation method of a thermophilic corrosion-resistance coating, coating means the compound aluminium chromium dosed thing coating that contains the disperse rare earth oxide, it is characterized in that technological process is as follows:
(1) make tiny rare earth oxide particle be suspended in the solution equably by suitable stirring, realize the codeposition of nickel and rare earth oxide with the method for galvanic deposit, thereby obtain to contain the nickel-rare earth oxide coelectrodeposition layer of small and dispersed rare earth oxide particle, carry out chromium plating then, on nickel-lanthanide oxide layer, prepare the thin chromium layer of one deck, on the chromium layer, be superimposed with nickel-lanthanide oxide layer at last again, thereby form the coating of three layers or multilayered structure
(2) above-mentioned coating is carried out High temperature diffusion under vacuum condition and handles, make the distribution of chromium be tending towards homogenizing, and obtain to contain the nickel-lanthanide oxide layer of chromium,
(3) coating that homogenizing is handled is carried out the thermodiffusion aluminising, finally prepares the compound aluminide coating that contains disperse rare earth oxide and the certain chromium content of tool.
2. according to the preparation method of the described thermophilic corrosion-resistance coating of claim 1, it is characterized in that concrete processing parameter is as follows:
(1) coelectrodeposition solution composition:
NiSO
4·7H
2O 200-250g/l
NiCl
2 45-50g/l
H
3BO
3 35-38g/l
Dehydrogenation tensio-active agent 0.05-0.1g/l
pH 4.0-4.5
DK 2-4A/dm
2
t 40-60min
T 50-55℃
The chrome-plated process parameter:
Plating bath:
Chromic anhydride Cr
2O
3200～250g/l
Sulfuric acid H
2SO
42.0～2.5g/l
60～65 ℃ of temperature
Current density 30～40A/dm
2
(2) vacuum heat diffusion treatment: 900～1000 ℃ of time 8～20h of temperature vacuum tightness 10
-2～10
-3Pa (3) aluminising: penetration enhancer composition: FeAl powder+NH
4Cl (1%wt) temperature 850～900 ℃/7-9h time 1050～1100 ℃/0.5-1.5h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94112517A CN1040671C (en) | 1994-09-14 | 1994-09-14 | Thermophilic corrosion-resistance coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94112517A CN1040671C (en) | 1994-09-14 | 1994-09-14 | Thermophilic corrosion-resistance coating |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN91106106A Division CN1038052C (en) | 1991-05-13 | 1991-05-13 | High temp. corrosion resistant painting and its preparation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1121538A CN1121538A (en) | 1996-05-01 |
| CN1040671C true CN1040671C (en) | 1998-11-11 |
Family
ID=5036194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94112517A Expired - Fee Related CN1040671C (en) | 1994-09-14 | 1994-09-14 | Thermophilic corrosion-resistance coating |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1040671C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106283135A (en) * | 2015-05-25 | 2017-01-04 | 中国科学院金属研究所 | A kind of method introducing rare metal Hf element in the coating |
| CN108642535B (en) * | 2018-05-31 | 2019-09-06 | 上海工程技术大学 | A kind of preparation method of ceria modified aluminide gradient coating system |
| CN111850529B (en) * | 2020-07-30 | 2022-07-08 | 西安热工研究院有限公司 | Anti-oxidation coating for high-temperature steam valve bolt of generator set and preparation method of anti-oxidation coating |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1037552A (en) * | 1989-02-24 | 1989-11-29 | 鸡西煤矿专用设备厂 | Composite processing technology for resisting corrosion |
| CN1041789A (en) * | 1988-10-07 | 1990-05-02 | 北京科技大学 | Embedding co-cementation of al and rare-earth alloy powders |
| CN1042738A (en) * | 1988-11-18 | 1990-06-06 | 鸡西市电缆桥架厂 | Purification process for zinc-nickel alloy plating of hydraulic mine props |
-
1994
- 1994-09-14 CN CN94112517A patent/CN1040671C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1041789A (en) * | 1988-10-07 | 1990-05-02 | 北京科技大学 | Embedding co-cementation of al and rare-earth alloy powders |
| CN1042738A (en) * | 1988-11-18 | 1990-06-06 | 鸡西市电缆桥架厂 | Purification process for zinc-nickel alloy plating of hydraulic mine props |
| CN1037552A (en) * | 1989-02-24 | 1989-11-29 | 鸡西煤矿专用设备厂 | Composite processing technology for resisting corrosion |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1121538A (en) | 1996-05-01 |
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