CN102965623B - Method for repairing NiCrAlYSi coating on DZ125 blade surface - Google Patents
Method for repairing NiCrAlYSi coating on DZ125 blade surface Download PDFInfo
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- CN102965623B CN102965623B CN201210444986.2A CN201210444986A CN102965623B CN 102965623 B CN102965623 B CN 102965623B CN 201210444986 A CN201210444986 A CN 201210444986A CN 102965623 B CN102965623 B CN 102965623B
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Abstract
The invention belongs to the field of surface treatment, and particularly a method for repairing an NiCrAlYSi coating on a DZ125 blade surface. The method comprises the following steps: removing the original NiCrAlYSi coating on the blade in a coating removal tank solution, treating the blade with a wool felt wheel bonded with 180-mesh corundum until no megascopic coating residue is left on the blade surface, plating a new NiCrAlYSi coating with a vacuum arc plating device for 110-130 minutes, and finally, carrying out heat treatment on the blade in a vacuum heat treatment furnace. The blade subjected to coating repair has the advantages of good use effect and stable property and state; surface over etching, fluoroscopy, mechanical properties and other performance indexes can achieve the design requirements; and the blade repaired through the coating by utilizing the method provided by the invention has the advantages of low production cost, operation convenience and wide application prospects.
Description
Technical field
The invention belongs to field of surface treatment, be specifically related to a kind of restorative procedure of DZ125 blade surface NiCrAlYSi coating.
Background technology
After engine uses a life cycle, need to carry out trouble shooting according to design requirements, for the part not meeting standard requirement, need place under repair and reach standard, just can again come into operation, otherwise will process be scrapped.Therefore, improve the work-ing life of part, reduce costs, maintenance process is very crucial.
Material is the engine blade of DZ125 alloy, in order to effectively improve resistance to high temperature corrosion and high-temperature fuel gas stream scouring capability, vacuum arc method plating NiCrAlYSi coating is have employed as protective layer at blade surface, through week in work-ing life after date, coating has and to come off and imperfect phenomenon, the service requirements of design cannot be met, thus cause blade rejection, condemnation factor reaches more than 30%, this just needs to carry out coating removal, recoat plating coating and thermal treatment, repairs DZ125 blade surface NiCrAlYSi coating.But because DZ125 alloy material itself has higher anti-oxidant, corrosion resistance; and the coating even compact after diffusion heat treatments adopting vacuum ionic depositing process to obtain; bonding strength is high, can protect body material well, adopts general method to be difficult to coating to remove completely.Adopting machining process to remove coating in prior art easily causes accessory size overproof, adopts chemical process to remove coating, is easy to again the excessive erosion causing blade base, also easily occur the bad phenomenon such as fluorescence display simultaneously.
Summary of the invention
For above-mentioned prior art Problems existing, the invention provides a kind of restorative procedure of DZ125 blade surface NiCrAlYSi coating, object removes the original coating of blade by adopting chemistry to remove in conjunction with mechanical polishing, adopt vacuum arc plating and diffusion in vacuum to combine and prepare new coating, realize the reparation to DZ125 blade surface NiCrAlYSi coating, guarantee that blade base is not corroded, the size conforms standard of blade simultaneously.
Realize technical scheme of the present invention to carry out according to following steps:
(1) original coating is removed: heating coating removes tank liquor to (38-40) DEG C, and the DZ125 blade pending painting being coated with NiCrAlYSi coating is placed in coating removal tank liquor, stirs tank liquor simultaneously, process (8-25) min;
Take out the blade after process, polishing process is carried out to blade, till blade surface is without macroscopic coating remnants with the wool bob being stained with 180 order silicon carbide;
(2) vacuum arc plating coating: adopt vacuum arc plating appts, operating pressure < 5.32 × 10 is set
-2pa, working current is (600-700) A, operating voltage 250V, ion cleaning (2-6) min is carried out to blade surface, then arranging working current is (700-750) A, operating voltage is (30-34) V, at blade surface coating NiCrAlYSi coating (110-130) min, afterwards by blade furnace cooling (2-2.5) h;
(3) vacuum heat treatment: cooled blade is placed in vacuum heat treatment furnace, in (860-880) DEG C insulation 20h.
Wherein said coating removal tank liquor is 1.4g/cm by density
3nitric acid (380-410) mL/L, mass concentration is that hydrofluoric acid (20-25) mL/L of 40%, iron powder (2-4) g/L and deionized water are formulated.
Compared with prior art, feature of the present invention and beneficial effect are:
The restorative procedure that the present invention is directed to DZ125 blade surface NiCrAlYSi coating overcomes existing simple mechanical working method removing coating and easily causes accessory size overproof, or pure chemistry method is removed coating, be easy to again the problem of the excessive erosion causing blade base, acid liquid corrosion is adopted to remove NiCrAlYSi coating, strict control treatment temperature and treatment time, prevent excessive erosion, then adopt wool bob to the further polished finish of blade, to ensure the removal completely of coating;
In addition, in order to thoroughly remove some ion remaining in blade surface, first ion cleaning has been carried out when vacuum arc plating, and then carry out the coating of coating, last vacuum heat treatment, forms diffusion layer at blade surface, ensure that the coating after reparation is combined closely with blade base.
The blade result of use after coating is repaired that the inventive method obtains is good, performance and in stable condition, and the performance index such as surperficial excessive erosion, fluoroscopy, mechanical property all reach design requirements, and low production cost, easy to operate, have a extensive future.
Embodiment
The vacuum arc plating appts adopted in the present invention is common commercial device.
When employing is stained with the wool bob process blade of 180 order silicon carbide, blade back employing specification is the bob of (φ 200 × 40) mm, and leaf basin employing specification is the bob of (φ 35 × 40) mm.
Adopt coating removal tank liquor by: density is 1.4g/cm
3nitric acid (380-410) mL/L, mass concentration is that hydrofluoric acid (20-25) mL/L of 40%, iron powder (2-4) g/L and deionized water are formulated.
Detect according to the enduring quality of Q/3B1938-2011 standard to the DZ125 alloy vane through coating reparation;
Detect according to the room temperature tensile properties of Q/3B1938-2011 standard to the DZ125 alloy vane through coating reparation.
Embodiment 1
(1) original coating is removed: heating coating removes tank liquor to 38 DEG C, and the DZ125 blade pending painting being coated with NiCrAlYSi coating is placed in coating removal tank liquor, stirs tank liquor simultaneously, process 25min;
Take out the blade after process, polishing process is carried out to blade, till blade surface is without macroscopic coating remnants with the wool bob being stained with 180 order silicon carbide;
(2) vacuum arc plating coating: adopt vacuum arc plating appts, operating pressure < 5.32 × 10 is set
-2pa, working current is 600A, operating voltage 250V, and carry out ion cleaning 6min to blade surface, then arranging working current is 700A, and operating voltage is 30V, at blade surface coating NiCrAlYSi coating 130min, afterwards by blade cooling 2h;
(3) vacuum heat treatment: cooled blade is placed in vacuum heat treatment furnace, in 860 DEG C of insulation 20h.
Industrial as shown in table 1 to the requirement of DZ125 alloy vane enduring quality, the enduring quality of the DZ125 alloy vane before carrying out coating reparation and after coating is repaired is as shown in table 2 and table 3, as can be seen from table, DZ125 alloy vane enduring quality change after coating is repaired is very little, meets industrial requirements completely.
According to Q/3B1938-2011 standard, the tensile property of Alloy At Room Temperature requires to be more than or equal to 820MPa for σ b >=980MPa, σ 0.2, δ >=5%, Ψ >=5%.
The requirement of table 1 DZ125 alloy vane enduring quality
Table 2 carries out the enduring quality of the preprosthetic DZ125 alloy vane of coating
Table 3 the present embodiment carries out the enduring quality of the DZ125 alloy vane of coating reparation
The room temperature tensile properties of the DZ125 alloy vane before the reparation of table 4 coating and after coating reparation compares
| σb（MPa） | σ0.2（MPa） | δ（%） | Ψ（%） | |
| Before reparation | 1292.5 | 983.75 | 13.4 | 14.4 |
| After reparation | 1135 | 946 | 10.9 | 14.8 |
Embodiment 2
(1) original coating is removed: heating coating removes tank liquor to 40 DEG C, and the DZ125 blade pending painting being coated with NiCrAlYSi coating is placed in coating removal tank liquor, stirs tank liquor simultaneously, process 8min;
Take out the blade after process, lay the grain is carried out to blade, till blade surface is without macroscopic coating remnants with the wool bob being stained with 180 order silicon carbide;
(2) vacuum arc plating coating: adopt vacuum arc plating appts, operating pressure < 5.32 × 10 is set
-2pa, working current is 700A, operating voltage 250V, and carry out ion cleaning 2min to blade surface, then arranging working current is 750A, and operating voltage is 34V, at blade surface coating NiCrAlYSi coating 110min, afterwards by blade cooling 2.5h;
(3) vacuum heat treatment: cooled blade is placed in vacuum heat treatment furnace, in 880 DEG C of insulation 20h.
Embodiment 3
(1) original coating is removed: heating coating removes tank liquor to 39 DEG C, the DZ125 blade pending painting being coated with NiCrAlYSi coating is placed in coating removal tank liquor, stir tank liquor simultaneously, process 10min, take out blade, in the warm water of flowing, brush off the residue on blade with hairbrush, observe coating removal situation, blade side more for residue coating is placed in tank liquor down, continues process 5min;
Take out the blade after process, lay the grain is carried out to blade, till blade surface is without macroscopic coating remnants with the wool bob being stained with 180 order silicon carbide;
(2) vacuum arc plating coating: adopt vacuum arc plating appts, operating pressure < 5.32 × 10 is set
-2pa, working current is 650A, operating voltage 250V, and carry out ion cleaning 4min to blade surface, then arranging working current is 720A, and operating voltage is 32V, at blade surface coating NiCrAlYSi coating 120min, afterwards by blade cooling 2.5h;
(3) vacuum heat treatment: cooled blade is placed in vacuum heat treatment furnace, in 870 DEG C of insulation 20h.
Claims (1)
1. the restorative procedure of a DZ125 blade surface NiCrAlYSi coating, comprise and remove original coating, vacuum arc plating coating and vacuum heat treatment, wherein vacuum heat treatment is that cooled blade is placed in vacuum heat treatment furnace, in 860-880 DEG C of insulation 20h, it is characterized in that removing original coating, vacuum arc plating coating carry out according to following steps:
(1) original coating is removed: heating coating removes tank liquor to 38-40 DEG C, and the DZ125 blade pending painting being coated with NiCrAlYSi coating is placed in coating removal tank liquor, stirs tank liquor simultaneously, process 8-25min; Described coating removal tank liquor is 1.4g/cm by density
3nitric acid 380-410mL/L, mass concentration is that the hydrofluoric acid 20-25mL/L of 40%, iron powder 2-4g/L and deionized water are formulated;
Take out the blade after process, polishing process is carried out to blade, till blade surface is without macroscopic coating remnants with the wool bob being stained with 180 order silicon carbide;
(2) vacuum arc plating coating: adopt vacuum arc plating appts, operating pressure < 5.32 × 10 is set
-2pa, working current is 600-700A, operating voltage 250V, carry out ion cleaning 2-6min to blade surface, then arranging working current is 700-750A, and operating voltage is 30-34V, at blade surface coating NiCrAlYSi coating 110-130min, afterwards by blade cooling 2-2.5h.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210444986.2A CN102965623B (en) | 2012-11-09 | 2012-11-09 | Method for repairing NiCrAlYSi coating on DZ125 blade surface |
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| CN201210444986.2A CN102965623B (en) | 2012-11-09 | 2012-11-09 | Method for repairing NiCrAlYSi coating on DZ125 blade surface |
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| CN102965623A CN102965623A (en) | 2013-03-13 |
| CN102965623B true CN102965623B (en) | 2015-07-01 |
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| CN103882441A (en) * | 2014-03-25 | 2014-06-25 | 东方电气集团东方汽轮机有限公司 | Repairing method of 2Cr12NiMo1W1V blade surface Al coating |
| US10985078B2 (en) * | 2015-11-06 | 2021-04-20 | Lam Research Corporation | Sensor and adjuster for a consumable |
| CN106757026B (en) * | 2016-12-22 | 2019-04-09 | 成都发动机（集团）有限公司 | A kind of minimizing technology of engine turbine blade AlSiY coating |
| CN110158041B (en) * | 2019-07-09 | 2021-01-26 | 中国科学院宁波材料技术与工程研究所 | NiSiAlY coating, preparation method and application thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1607264A (en) * | 2003-10-13 | 2005-04-20 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for preparing aluminum-silicon-yttrium diffusion alloying coating |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1607264A (en) * | 2003-10-13 | 2005-04-20 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for preparing aluminum-silicon-yttrium diffusion alloying coating |
Non-Patent Citations (1)
| Title |
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| Cr对HY3包覆型涂层退除的影响;蔡妍等;《材料工程》;20061231(第3期);第33页左栏第1段至右栏第4段，表1，第36页左栏第13-17行 * |
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Address after: 110043 Dong TA street, Dadong District, Shenyang, Liaoning Province, No. 6 Patentee after: Chinese Hangfa Shenyang Liming Aero engine limited liability company Address before: 110043 Dong TA street, Dadong District, Shenyang, Liaoning Province, No. 6 Patentee before: Liming Aeroplane Engine (Group) Co., Ltd., Shenyang City |