CN100528379C - Process for hot spraying of rotating parts - Google Patents
Process for hot spraying of rotating parts Download PDFInfo
- Publication number
- CN100528379C CN100528379C CNB2003101091211A CN200310109121A CN100528379C CN 100528379 C CN100528379 C CN 100528379C CN B2003101091211 A CNB2003101091211 A CN B2003101091211A CN 200310109121 A CN200310109121 A CN 200310109121A CN 100528379 C CN100528379 C CN 100528379C
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- China
- Prior art keywords
- matrix surface
- matrix
- coating
- spraying
- fatigue strength
- 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.)
- Expired - Lifetime
Links
- 238000005507 spraying Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title abstract description 5
- 238000010891 electric arc Methods 0.000 claims abstract description 7
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910001120 nichrome Inorganic materials 0.000 claims abstract description 3
- 229910000943 NiAl Inorganic materials 0.000 claims abstract 2
- NPXOKRUENSOPAO-UHFFFAOYSA-N Raney nickel Chemical compound [Al].[Ni] NPXOKRUENSOPAO-UHFFFAOYSA-N 0.000 claims abstract 2
- 239000011159 matrix material Substances 0.000 claims description 32
- 238000000576 coating method Methods 0.000 claims description 22
- 239000011248 coating agent Substances 0.000 claims description 21
- 238000007788 roughening Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 9
- 239000000956 alloy Substances 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 claims description 3
- 238000007749 high velocity oxygen fuel spraying Methods 0.000 claims description 2
- 239000007921 spray Substances 0.000 abstract description 7
- 238000005406 washing Methods 0.000 abstract 1
- 239000000758 substrate Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000002203 pretreatment Methods 0.000 description 3
- 238000004873 anchoring Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000009661 fatigue test Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
Landscapes
- Coating By Spraying Or Casting (AREA)
Abstract
A hot spray method for the rotating workpiece includes such steps as applying a prestress to the surface of workpiece, washing for removing oil, roughtening the surface, spraying NiAl, NiCr or FeCrAl to form a basic layer, spraying Mo, 3Cr13 or 2Cr13 to form a working layer, and high-speed electric arc spray. It can improve the fatigue strength.
Description
Technical field
The present invention relates to technical field of surface, particularly to the spraying coating process of revolving part thermal spraying.
Background technology
Plasma spray technology has its distinctive superiority as an important component part of sufacing, is more and more paid attention to.Bond Strength of Coating, wearability and corrosion resistance etc., but to the parts of some rotoflector except above-mentioned performance requirement, its fatigue behaviour also is to consider.Just how and how hot-spraying coating improves its influence to the INFLUENCE ON FATIGUE STRENGTH of matrix.
Existing revolving part heat spraying method is substantially: blasting treatment is adopted in pre-treatment, in conjunction with cleaning such as deoiling, sprays then.Because adopt the sandblast pre-treatment, the combination interface of coating and matrix is a rough surface, also be the place that stress is concentrated, cause the quick formation and the growth in fatigue crack source, thereby the fatigue strength of coated substrate is obviously descended.In addition, there is certain residual stress in the junction of coating and matrix, and prestressing force is generally tensile stress state, and this is because the thermal coefficient of expansion of thermal spray process floating coat and matrix material is different and structural stress causes.FATIGUE CRACK GROWTH has also been quickened in the existence of residual tension, has caused the fatigue strength of coated substrate to descend fast.
Summary of the invention
The object of the present invention is to provide a kind of revolving part heat spraying method, can improve the revolving part case hardness after the coating; Do not influence the fatigue strength of matrix after the coating.
For achieving the above object, technical solution of the present invention is: the revolving part heat spraying method comprises the steps:
A) matrix surface adopts the precompressed of roller fashion of extrusion, and matrix surface is applied certain compressive pre-stress, forms compressive stress layer at matrix subsurface layer, stops the formation and the expansion in fatigue crack source;
B) matrix surface cleans, and deoils;
C) matrix surface adopts the roughening treatment of electrospark roughening mode, makes matrix surface form a plurality of microspikes;
D) prime coat is at matrix surface spraying alloy material;
E) on bottom again sprayed on material form working lining, described material is Mo, 3Cr13 or 2Cr13, to improve workpiece wearability and corrosion resistance;
F) coating adopts high speed electric arc or HVOF coating.
Wherein, described step a matrix surface adopts the precompressed of roller fashion of extrusion, makes matrix surface and subsurface layer produce certain thickness compressive stress layer, helps improving the fatigue strength of matrix;
Described step c matrix surface adopts the roughening treatment of electrospark roughening mode, form salient point at matrix surface, raising matrix surface roughness and coating and high base strength have changed fatigue stress expansion way in addition and have levied, thereby have improved the fatigue strength of coated substrate.
The alloy material of described steps d is NiAl, NiCr or FeCrAl, and alloys such as spraying NiAl help improving coating and high base strength, have reduced coating and matrix bond place residual stress.
Beneficial effect of the present invention: enforcement of the present invention, the fatigue strength of hot-spraying coating matrix is gone up not down, be specially adapted to need to consider the parts of fatigue strength.
The specific embodiment
Embodiment is referring to table 1, table 2.
The mechanical properties results of coating sees Table 3, table 4, table 5, under the situation of sandblast (Comparative Examples 1,2), the fatigue strength of the coated substrate of hot-spraying coating (215MPa) is starkly lower than the fatigue strength (317MPa) of matrix itself, its reason is, from mechanics of materials viewpoint, the process of fatigue strength can be divided into three phases: i.e. expansion of the formation of fatigue crack, fatigue crack and instantaneous fracture.From the fatigue testing specimen fracture analysis as can be seen: the fatigue crack source of coated substrate is formed at the combination interface of coating and matrix and is not in specimen surface (being coating surface).Because adopt the sandblast pre-treatment, the combination interface of coating and matrix is a rough surface, also be the concentrated place of stress, cause the quick formation and the growth in fatigue crack source, thus make coated substrate fatigue strength obviously descend.In addition, there is certain residual stress in the junction of coating and matrix, and prestressing force is generally tensile stress state, and this is because the thermal coefficient of expansion of thermal spray process floating coat and matrix material is different and structural stress causes.FATIGUE CRACK GROWTH has also been quickened in the existence of residual tension, has caused the fatigue strength of coated substrate to descend fast.
The fatigue strength (307.5MPa) of embodiment 1 sample illustrates by electrospark roughening and handles significantly better than the sandblast roughening treatment apparently higher than the fatigue strength (215MPa) of Comparative Examples 1 sample.From the mechanics of materials and stress distribution situation, owing to after the electrospark roughening processing, on protocorm, form a lot of salient points, do not resemble sandblast and on protocorm, form a lot of concave points, change the stress propagation direction, thereby improved the fatigue strength of coated substrate.
Table 1
| Pre-treating technology | Sprayed on material | Spraying method | |
| Comparative Examples 1 | Sandblast Sa | Mo | High Speed Electric Arc Spraying |
| Comparative Examples 2 | Sandblast Sa | Mo | High Speed Electric Arc Spraying |
| Embodiment 1 | Not sandblast+electrospark roughening alligatoring+prime coat (NiAl) | Mo | High Speed Electric Arc Spraying |
| Embodiment 2 | Not sandblast+prestressing force electrospark roughening alligatoring+prime coat (NiAl) | Mo | High Speed Electric Arc Spraying |
Table 2
| Embodiment | Sprayed on material | Spray voltage V | Spraying current A | Spray distance mm | Air pressure MPa |
| 1 | Mo | 31 | 100 | 100～150 | 0.63 |
| 2 | Mo | 34 | 200 | 100～150 | 0.63 |
| 3 | Mo | 34 | 150 | 100～150 | 0.63 |
Table 3
| Anchoring strength of coating scope (MPa) | Voidage % | |
| Embodiment 1 | 41.5 | 10 |
| Embodiment 2 | 42.5 | 10 |
| Comparative Examples 1 | 41.3 | 5 |
| Comparative Examples 2 | 35.8 | 10 |
Table 4
| Fatigue strength (MPa) | |
| Matrix | 317 |
| Embodiment 1 | 307.5 |
| Embodiment 2 | 319.5 |
| Comparative Examples 1 | 215 |
| Comparative Examples 2 | 285 |
Table 5
| Sprayed on material | Anchoring strength of coating scope (MPa) | The fatigue strength of coated substrate (MPa) |
| Mo | 35.8～45.3 | 215～320 |
| 3Cr13 | 33.5～45.0 | 210～285 |
| 2Cr13 | 35.0～45.5 | 210～300 |
Claims (2)
1. the revolving part heat spraying method comprises the steps:
A) matrix surface adopts the precompressed of roller fashion of extrusion, and matrix surface is applied certain compressive pre-stress;
B) matrix surface cleans, and deoils;
C) matrix surface adopts the roughening treatment of electrospark roughening mode, makes matrix surface form a plurality of microspikes;
D) prime coat is at matrix surface spraying alloy material;
E) on bottom again sprayed on material form working lining, described material is Mo, 3Cr13 or 2Cr13;
F) coating, high speed electric arc or HVOF.
2. revolving part heat spraying method as claimed in claim 1 is characterized in that, the alloy material of described steps d is NiAl, NiCr or FeCrAl.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101091211A CN100528379C (en) | 2003-12-05 | 2003-12-05 | Process for hot spraying of rotating parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101091211A CN100528379C (en) | 2003-12-05 | 2003-12-05 | Process for hot spraying of rotating parts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1623678A CN1623678A (en) | 2005-06-08 |
| CN100528379C true CN100528379C (en) | 2009-08-19 |
Family
ID=34758844
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101091211A Expired - Lifetime CN100528379C (en) | 2003-12-05 | 2003-12-05 | Process for hot spraying of rotating parts |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100528379C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8182881B2 (en) * | 2008-12-24 | 2012-05-22 | United Technologies Corporation | Methods for reducing stress when applying coatings, processes for applying the same and their coated articles |
| TWI414614B (en) * | 2010-12-06 | 2013-11-11 | Hon Hai Prec Ind Co Ltd | Coated article and method for making the same |
| CN102634749A (en) * | 2012-05-14 | 2012-08-15 | 上海电气电站设备有限公司 | Spraying technology for low-pressure separating plate of 1000MW-level nuclear power turbine |
| CN103882365A (en) * | 2012-12-21 | 2014-06-25 | 上海宝钢工业技术服务有限公司 | Preparation method of surface compound coating for guide rail of large measuring machine |
| CN107312995B (en) * | 2017-07-04 | 2019-05-31 | 安徽威龙再制造科技股份有限公司 | A kind of abrasion of inner hole of bearing seat remanufactures spray repair method |
-
2003
- 2003-12-05 CN CNB2003101091211A patent/CN100528379C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CN1623678A (en) | 2005-06-08 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SHANGHAI BAOSTEEL WHEEL CO., LTD. Free format text: FORMER OWNER: SHANGHAI BAOSTEEL CONSTRUCTION DESIGN RESEARCH INSTITUTE Effective date: 20100528 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHANGHAI BAOSTEEL CONSTRUCTION DESIGN RESEARCH INS Free format text: FORMER NAME: SHANGHAI STEEL + IRON PROCESS TECHNOLOGY RESEARCH INSTITUTE |
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| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 200050 NO.1118, DINGXI ROAD, CHANGNING DISTRICT, SHANGHAI CITY TO: 200941 NO.3962, YUNCHUAN ROAD, SHANGHAI CITY |
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| CP01 | Change in the name or title of a patent holder |
Address after: 200050 No. 1118 Dingxi Road, Shanghai, Changning District Patentee after: SHANGHAI BAOSTEEL CONSTRUCTION DESIGN AND Research Institute Address before: 200050 No. 1118 Dingxi Road, Shanghai, Changning District Patentee before: SHANGHAI INST OF IRON & STEEL |
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| TR01 | Transfer of patent right |
Effective date of registration: 20100528 Address after: 200941 Shanghai City Yun Chuan Road No. 3962 Patentee after: SHANGHAI BAOSTEEL WHEEL Co.,Ltd. Address before: 200050 No. 1118 Dingxi Road, Shanghai, Changning District Patentee before: Shanghai Baosteel Construction Design and Research Institute |
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| CX01 | Expiry of patent term |
Granted publication date: 20090819 |
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| CX01 | Expiry of patent term |