CN103048324A - Metallographic evaluation method for quality of plasma spraying CoCrW coating - Google Patents
Metallographic evaluation method for quality of plasma spraying CoCrW coating Download PDFInfo
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- CN103048324A CN103048324A CN2011103091032A CN201110309103A CN103048324A CN 103048324 A CN103048324 A CN 103048324A CN 2011103091032 A CN2011103091032 A CN 2011103091032A CN 201110309103 A CN201110309103 A CN 201110309103A CN 103048324 A CN103048324 A CN 103048324A
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Abstract
The invention relates to a metallographic evaluation method for quality of a plasma spraying CoCrW coating. Specifically, the method comprises the steps of selecting a detection view field of a metallographic specimen, shooting the detection view field, analyzing the view field which is selected and shot, and recognizing the coating quality meets a qualified requirement when the analysis results meet the following requirements that 1) interface pollutions of both between a bottom layer and between a matrix and a surface layer and a bottom layer are less than 20%; 2) no crack is formed in the coating; 3) oxide content is less than 10%, and no continuous strip oxide or bulk oxide with a diameter larger than 60 [mu]m is allowed; 4) porosity is less than 15%; and that 5) the content of un-melted particles is less than 20%, and the diameter of the particles is smaller than 100[mu]m. On basis of corresponding requirements for the quality, the metallographic sample preparation method of the plasma spraying CoCrW coating and evaluation standards for various phases of the microstructures are determined.
Description
Technical field
The present invention relates to the technical field of hot spray coating quality judging standard formulation, a kind of metallographic assessment method of plasma spraying CoCrW coating quality is provided especially.
Background technology
In the prior art, the CoCrW alloy coat is the high-temperature wear resistant coating of using below 950 ℃, and the CoCrW alloy powder material has also been realized production domesticization research and batch production already, is widely used at parts such as dual-use engines.
At present, domestic performance quality to this coating judges that the mechanical properties such as hardness or bond strength are only arranged, and the metallographic microstructure quality control requirement of microstructure of plasma sprayed CoCrW coating is in blank.In order to improve coating quality, control better the spraying production of coating component, plasma spraying CoCrW coating Metallographic standard formulation work is carried out in the urgent hope of people as early as possible, improves the hot spray coating performance standard, improves the hot spray coating quality control level.
People thirst for obtaining a kind of metallographic assessment method of plasma spraying CoCrW coating quality.
Summary of the invention
The purpose of this invention is to provide the preferably metallographic assessment method of plasma spraying CoCrW coating quality of a kind of technique effect, it can improve plasma spraying CoCrW Coating quality testing standard, improve the quality control level of this coating, guarantee the reliability that this coating is used.
The metallographic assessment method of a kind of plasma spraying CoCrW of the present invention coating quality is characterized in that: the metallographic assessment method of plasma spraying CoCrW coating quality specifically:
Field of detection in the selected metallographic specimen is taken pictures; Following analysis is carried out in visual field selected and that taken pictures: and satisfy following requirement and think that namely this coating quality satisfies qualified requirement:
1) require bottom and matrix, surface layer and bottom interface pollution all less than 20%;
2) do not allowed crackle in the coating;
3) oxide content has not allowed continuous strip oxide less than 10%, has not allowed diameter greater than 60 μ m bulk oxides;
4) porosity is less than 15%;
5) no cofusing particle is less than 20%, and diameter is less than 100 μ m.
In the metallographic assessment method of described plasma spraying CoCrW coating quality, the analysis and calculation of interface pollution degree satisfies following requirement: pollute content according to the lenth ratio calculation interface that pollutes length and whole visual field.
Powder particle keeps original shape and its ratio of width to height to be called no cofusing particle less than 3:2 in the definition coating; Calculate the no cofusing particle size according to scale and microscope survey instrument, its content adopts area-method to calculate: account for coating area correspondence according to no cofusing particle area in the visual field and be calculated as content value (the no cofusing particle area accounts for the number percent of coating area in the visual field).
No cofusing particle peel off or spraying parameter improper, will produce hole; Porosity is concrete to adopt following dual mode to measure: one, and area-method specifically accounts for the number percent of coating area as porosity value with mesoporosity, visual field area; Its two, adopt microscope with the facies analysis function to carry out facies analysis and obtain porosity value.
In the spraying process, powder is easily oxidation in flight course, and oxide into strips or bunch shape porosity; Measure oxide content with one of following two kinds of methods: one, area-method is specifically calculated the number percent that mesoporosity, visual field area accounts for the coating area, and this value is the oxide content value; Its two, adopt microscope with the facies analysis function to carry out facies analysis and obtain the oxide content value.
The process of making metallographic specimen satisfies following requirement: at first adopt water-cooled cutting machine and SiC or Al
2O
3Emery wheel cuts, and requires emery wheel to satisfy following requirement: thickness is 1.5mm-2mm, diameter 25mm-40mm; Grind after the cutting and polishing, grinding and polish pressure require to be 20-23N.For fear of metallographic test sample issuable multiple illusion and affect metallographic and judge in sample making course, should determine rational plasma spraying CoCrW alloy coat metallographic sample preparation parameter.According to hardness and the toughness of plasma spraying CoCrW coating, for plasma spraying CoCrW wear-resistant coating, determined the making requirement of metallographic sample.
The plasma spraying CoCrW coating quality that the metallographic assessment method of described plasma spraying CoCrW coating quality is corresponding requires: anchoring strength of coating is greater than 20.7MPa, and hardness HR15N is greater than 69.The present invention has determined metallographic sample preparation method and each phase content evaluation criteria of microstructure of plasma spraying CoCrW coating on the basis that requires according to above-mentioned corresponding mass.
Carry out the coating metallographic structure analysis for plasma spraying CoCrW high-temperature wear resistant coating, satisfying in coating under the requirement of mechanical performance index, detect the scope of coating metallographic index, comprise the content range of the indices such as coating interface pollution, crackle, oxide, hole, no cofusing particle.By with reference to external similar component Coating quality testing mode standard, formulate the metal lographic examination standard of this coating.
By the formulation of coating Metallographic standard, can guarantee coating quality stability and consistance, improve the reliability of Coating quality control level and coatings applications, reduce simultaneously the repair rate of part coating.Plasma spraying CoCrW high-temperature wear resistant coating Metallographic standard can obtain widespread use in military project and civilian industry, will produce huge social benefit and significant economic benefit.
Description of drawings
The present invention is further detailed explanation below in conjunction with drawings and the embodiments:
Fig. 1 is one of plasma spraying CoCrW coating typical microstructures structure (200 *);
Fig. 2 is two (200 *) of plasma spraying CoCrW coating typical microstructures structure;
Fig. 3 is three (200 *) of plasma spraying CoCrW coating typical microstructures structure.
Embodiment
Embodiment 1
A kind of metallographic assessment method of plasma spraying CoCrW coating quality, the metallographic assessment method of plasma spraying CoCrW coating quality be specifically:
Field of detection in the selected metallographic specimen is taken pictures; Following analysis is carried out in visual field selected and that taken pictures: and satisfy following requirement and think that namely this coating quality satisfies qualified requirement:
1) require bottom and matrix, surface layer and bottom interface pollution all less than 20%;
2) do not allowed crackle in the coating;
3) oxide content has not allowed continuous strip oxide less than 10%, has not allowed diameter greater than 60 μ m bulk oxides;
4) porosity is less than 15%;
5) no cofusing particle is less than 20%, and diameter is less than 100 μ m.
In the metallographic assessment method of described plasma spraying CoCrW coating quality, the analysis and calculation of interface pollution degree satisfies following requirement: pollute content according to the lenth ratio calculation interface that pollutes length and whole visual field.As shown in Figure 1, calculating interface pollution is 7.6%;
Powder particle keeps original shape and its ratio of width to height to be called no cofusing particle less than 3:2 in the definition coating; As shown in Figure 2, calculate the no cofusing particle size according to scale and microscope survey instrument, its content adopts area-method to calculate: account for coating area correspondence according to no cofusing particle area in the visual field and be calculated as content value (the no cofusing particle area accounts for the number percent of coating area in the visual field), the no cofusing particle size is 32 μ m among Fig. 2, and content is 5%.
No cofusing particle peel off or spraying parameter improper, will produce hole, as shown in Figure 2;
Porosity specifically adopts area-method to measure, and specifically mesoporosity, visual field area is accounted for the number percent of coating area as porosity value.Fig. 2 mesoporosity size is 42 μ m, and content is 12%.
In the spraying process, powder is easily oxidation in flight course, and oxide into strips or bunch shape porosity, as shown in Figure 3, measure oxide content with following area-method, specifically calculate the number percent that mesoporosity, visual field area accounts for the coating area, this value is the oxide content value.A bunch shape oxide size is 45 μ m among Fig. 3, and the strip oxide of disperse and bunch shape oxide content amount to 7%.
The process of making metallographic specimen satisfies following requirement: at first adopt water-cooled cutting machine and SiC or Al
2O
3Emery wheel cuts, and requires emery wheel to satisfy following requirement: thickness is 1.8mm, diameter 35mm; Grind after the cutting and polishing, grinding and polish pressure require to be 21N.For fear of metallographic test sample issuable multiple illusion and affect metallographic and judge in sample making course, should determine rational plasma spraying CoCrW alloy coat metallographic sample preparation parameter.According to hardness and the toughness of plasma spraying CoCrW coating, for plasma spraying CoCrW wear-resistant coating, determined the making requirement of metallographic sample.
The plasma spraying CoCrW coating quality that the metallographic assessment method of described plasma spraying CoCrW coating quality is corresponding requires: anchoring strength of coating is greater than 20.7MPa, and hardness HR15N is greater than 69.On the basis according to above-mentioned corresponding mass requirement, determined metallographic sample preparation method and each phase content evaluation criteria of microstructure of plasma spraying CoCrW coating.
Carry out the coating metallographic structure analysis for plasma spraying CoCrW high-temperature wear resistant coating, satisfying in coating under the requirement of mechanical performance index, detect the scope of coating metallographic index, comprise the content range of the indices such as coating interface pollution, crackle, oxide, hole, no cofusing particle.By with reference to external similar component Coating quality testing mode standard, formulate the metal lographic examination standard of this coating.
By the formulation of coating Metallographic standard, can guarantee coating quality stability and consistance, improve the reliability of Coating quality control level and coatings applications, reduce simultaneously the repair rate of part coating.Plasma spraying CoCrW high-temperature wear resistant coating Metallographic standard can obtain widespread use in military project and civilian industry, will produce huge social benefit and significant economic benefit.
Embodiment 2
The present embodiment and embodiment 1 content are basic identical, and its difference mainly is:
1) porosity specifically adopts following manner to measure: adopt microscope with the facies analysis function to carry out facies analysis and obtain porosity value.Fig. 2 mesoporosity size is 42 μ m, and content is 12%.
2) measure oxide content with following method: adopt microscope with the facies analysis function to carry out facies analysis and obtain the oxide content value.A bunch shape oxide size is 45 μ m among Fig. 3, and the strip oxide of disperse and bunch shape oxide content amount to 7%.
3) metallographic specimen thickness is 0.2mm.
The process of 4) making metallographic specimen satisfies following requirement: at first adopt water-cooled cutting machine and SiC or Al
2O
3Emery wheel cuts, and requires emery wheel to satisfy following requirement: thickness is 1.5mm, diameter 25mm; Grind after the cutting and polishing, grinding and polish pressure require to be 20N.
The present embodiment and embodiment 1 content are basic identical, and its difference mainly is:
1) metallographic specimen thickness is 0.3mm.
The process of 2) making metallographic specimen satisfies following requirement: at first adopt water-cooled cutting machine and SiC or Al
2O
3Emery wheel cuts, and requires emery wheel to satisfy following requirement: thickness is 2mm, diameter 40mm; Grind after the cutting and polishing, grinding and polish pressure require to be 23N.For fear of metallographic test sample issuable multiple illusion and affect metallographic and judge in sample making course, should determine rational plasma spraying CoCrW alloy coat metallographic sample preparation parameter.According to hardness and the toughness of plasma spraying CoCrW coating, for plasma spraying CoCrW wear-resistant coating, determined the making requirement of metallographic sample.
Claims (7)
1. the metallographic assessment method of plasma spraying CoCrW coating quality is characterized in that: the metallographic assessment method of plasma spraying CoCrW coating quality specifically:
Field of detection in the selected metallographic specimen is taken pictures; Visual field selected and that taken pictures is analyzed: and satisfy following requirement and think that namely this coating quality satisfies qualified requirement:
1) require bottom and matrix, surface layer and bottom interface pollution all less than 20%;
2) do not allowed crackle in the coating;
3) oxide content has not allowed continuous strip oxide less than 10%, has not allowed diameter greater than 60 μ m bulk oxides;
4) porosity is less than 15%;
5) no cofusing particle is less than 20%, and diameter is less than 100 μ m.
2. according to the metallographic assessment method of the described plasma spraying CoCrW of claim 1 coating quality, it is characterized in that: in the metallographic assessment method of described plasma spraying CoCrW coating quality, the analysis and calculation of interface pollution degree satisfies following requirement:
Pollute content according to the lenth ratio calculation interface that pollutes length and whole visual field.
3. according to the metallographic assessment method of the described plasma spraying CoCrW of claim 1 coating quality, it is characterized in that: calculate the no cofusing particle size according to scale and microscope survey instrument, its content adopts area-method to calculate: account for coating area correspondence according to no cofusing particle area in the visual field and be calculated as content value.
4. according to the metallographic assessment method of the described plasma spraying CoCrW of claim 1 coating quality, it is characterized in that: porosity specifically adopts following dual mode to measure: one, area-method specifically accounts for the number percent of coating area as porosity value with mesoporosity, visual field area; Its two, adopt microscope with the facies analysis function to carry out facies analysis and obtain porosity value.
5. according to the metallographic assessment method of the described plasma spraying CoCrW of claim 1 coating quality, it is characterized in that: measure oxide content with one of following two kinds of methods: one, area-method, specifically calculate the number percent that mesoporosity, visual field area accounts for the coating area, this value is the oxide content value; Its two, adopt microscope with the facies analysis function to carry out facies analysis and obtain the oxide content value.
6. according to the metallographic assessment method of one of them described plasma spraying CoCrW coating quality of claim 1-5, it is characterized in that: the process of making metallographic specimen satisfies following requirement: at first adopt water-cooled cutting machine and SiC or Al
2O
3Emery wheel cuts, and requires emery wheel to satisfy following requirement: thickness is 1.5mm-2mm, diameter 25mm-40mm; Grind after the cutting and polishing, grinding and polish pressure require to be 20-23N.
7. according to the metallographic assessment method of the described plasma spraying CoCrW of claim 6 coating quality, it is characterized in that: the plasma spraying CoCrW coating quality requirement that the metallographic assessment method of described plasma spraying CoCrW coating quality is corresponding is: anchoring strength of coating is greater than 20.7MPa, and hardness HR15N is greater than 69.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103558151A (en) * | 2013-10-19 | 2014-02-05 | 沈阳黎明航空发动机(集团)有限责任公司 | Detection method of flame spraying type CuAl/NiC coating microstructure |
| CN103713002A (en) * | 2013-12-27 | 2014-04-09 | 昆明贵研催化剂有限责任公司 | Method for measuring coating thickness of automotive tail gas catalyst |
| CN109722618A (en) * | 2017-10-26 | 2019-05-07 | 沈阳黎明国际动力工业有限公司 | A kind of supersonic flame spraying technique of cobalt chromium tungsten wear-resistant coating |
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| CN1912570A (en) * | 2006-09-14 | 2007-02-14 | 中国铝业股份有限公司 | Method for analysing metallographic structure in aluminium alloy |
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| CN1912570A (en) * | 2006-09-14 | 2007-02-14 | 中国铝业股份有限公司 | Method for analysing metallographic structure in aluminium alloy |
| CN101403678A (en) * | 2008-09-19 | 2009-04-08 | 山西太钢不锈钢股份有限公司 | Metallic phase automatic detection method for stainless steel casting blank foreign matter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103558151A (en) * | 2013-10-19 | 2014-02-05 | 沈阳黎明航空发动机(集团)有限责任公司 | Detection method of flame spraying type CuAl/NiC coating microstructure |
| CN103713002A (en) * | 2013-12-27 | 2014-04-09 | 昆明贵研催化剂有限责任公司 | Method for measuring coating thickness of automotive tail gas catalyst |
| CN103713002B (en) * | 2013-12-27 | 2016-04-27 | 昆明贵研催化剂有限责任公司 | A kind of method measuring auto-exhaust catalyst coating thickness |
| CN109722618A (en) * | 2017-10-26 | 2019-05-07 | 沈阳黎明国际动力工业有限公司 | A kind of supersonic flame spraying technique of cobalt chromium tungsten wear-resistant coating |
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Application publication date: 20130417 |