CN103817056A - Coating service life prolonging method for preventing cracks of brittle coatings from being propagated through micro-spraying and micro-round-corners - Google Patents
Coating service life prolonging method for preventing cracks of brittle coatings from being propagated through micro-spraying and micro-round-corners Download PDFInfo
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- CN103817056A CN103817056A CN201410102374.4A CN201410102374A CN103817056A CN 103817056 A CN103817056 A CN 103817056A CN 201410102374 A CN201410102374 A CN 201410102374A CN 103817056 A CN103817056 A CN 103817056A
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Abstract
The invention discloses a coating service life prolonging method for preventing cracks of brittle coatings from being propagated through micro-spraying and micro-round-corners. The coating service life prolonging method includes the steps of detecting the surfaces of the coatings before transportation, and if it is found that the cracks exist on the surfaces of the coatings, knocking the crack tips to generate the micro-round-corners at the crack tips; packaging and transporting parts or structures; after the transportation process is completed, carrying out second-time detection on the surfaces of the coatings before the parts or structures are put into a storage to be stored, and if it is found that the cracks exist on the surfaces of the coatings, putting the parts or structures into the storage to be stored after micro-round-corner processing is carried out; carrying out third-time detection before use, and if a crack propagation phenomenon exists, filling the cracks through the micro-spraying or micro-brushing method before use. According to the coating service life prolonging method, the generation and propagation conditions of the cracks on the surfaces and the interiors of the coatings can be timely known, the cracks on the surfaces of the coatings can be effectively prevented from being propagated, the cracks generated on the surfaces of the coatings can be repaired, and the service life of the coating parts or structures is prolonged.
Description
Technical field
The invention belongs to inefficacy and the life-prolonging technique field of coating, relate to a kind of method that causes coating inefficacy for crackle forming continuous expansion in prevention brittle coating, relate in particular to a kind of pottery or inorganic matter coating owing to clashing into the Crack Extension of generation and the coating inefficacy finally causing and the method that extends coating life with transport vehicle and other exterior objects in transportation and storage process.
Background technology
Present stage, no matter in dual-use field, coating material has all entered the extensive use stage, and particularly, in guided missile or other spacecrafts, being permitted multipart coating is extremely important for serviceability.The broken invalid of coating more and more comes into one's own, and wherein, the expansion of crackle is the major reason that coating lost efficacy.The inefficacy of coating has a strong impact on the 26S Proteasome Structure and Function of material, thereby affects its serviceability.The undercoating of missile propulsive plant is a kind of fragility thermal barrier coating, can effectively improve the operating temperature of engine, once produce coating damage, can cause the phenomenon of hot-spot, thereby greatly reduce the operating temperature of engine.In all standard of China, stipulated a part of coating experimental technique and detection method, but these regulations mainly still lack and coating inefficacy and the relevant standard of lengthening the life, the judgement of losing efficacy about coating in engineering reality and the selection of life-prolongging measure become difficult.
The generation reason of coating crack is a lot, the crackle wherein producing with transport vehicle and other exterior objects shock in transportation and storage process is wherein very common one, the undercoating particularly using in the engine of guided missile, breakage in transit or scratching are destroyed almost inevitable.At present, numerical simulation and Experimental Characterization about inorganic matter and ceramic coating surface and propagation of internal cracks process have had more report, but these reports have just been continued to use the fundamental formular in fracture mechanics mostly, lack in engineering reality, particularly in coating component or structure transportation, stop the generation of crackle and the report of extended method, thereby in engineering reality, the very difficult coating crack expansion causing for this kind of reason and failure phenomenon are made and are prejudged and prevent, or take effective measures to extend the service life of coating for this kind of failure mode.
Summary of the invention
For the problems referred to above, the present invention proposes a kind of coating life-prolonging method that utilizes micro-spraying and micro-fillet to stop brittle coating Crack Extension, to reduce the generation of crackle in transportation, and Anticrack is to extend coating life.
The object of the invention is to be achieved through the following technical solutions:
Utilize micro-fillet and micro-spraying to stop a coating life-prolonging method for brittle coating Crack Extension, concrete steps are as follows:
The detection of coating surface before step 1, transportation
Utilize naked eyes or magnifying glass to observe part or the body structure surface of applying coating, whether have the crackle of micron level to detect coating surface: utilize acoustical signal to detect coating inner case simultaneously, detection case is carried out to record; If find that in testing process coating surface exists crackle, carry out step 2; If do not find that in detection coating surface exists crackle, directly carry out step 3.
In this step, the crack width of described coating surface is more than 60 μ m.
Knock crack tip, produce micro-fillet at crack tip.
In this step, can be under light microscope be that diamond, diameter are that the pressure head of 100 microns knocks crack tip by material, produce micro-fillet at crack tip.
Part or structure are positioned in the chest that special plastic foam etc. makes compared with softwood matter and are transported, or fill soft cushion between casing and object to be transported, and guarantee that the means of transport such as transport vehicle, ship steadily travels at the uniform speed, reduce jolting in transportation.
Before step 4, storage, detect
Complete after transportation, before part or the storage of structure warehouse-in, utilize light microscope to detect for the second time to coating surface, utilize acoustical signal to detect coating inner case simultaneously, the testing result recording in testing result and step 1 is compared, thereby optimize later transportation: if find that in testing process coating surface exists the crackle of micron level, carry out carrying out step 5 after micro-fillet processing according to the method for step 2; If do not find that in detection coating surface exists the crackle of micron level, directly carry out step 5.
Part or structure warehouse-in are stored, detected for the third time before use, if find the phenomenon of coating surface micron order Crack Extension in testing process, utilize before use the method for micro-spraying or micro-brushing to fill crackle.
In this step, described crackle fill method is: under light microscope, the ceramic particle identical with coating composition of mixed adhesive sprayed or brush the inside crack in coating.
The present invention has the following advantages:
1, clash into damaged problem for brittle coating transportation, adopted and detected and process the means that combine, understand in time generation and the spread scenarios of coating surface and underbead crack;
2, the method that adopts the micro-fillet in transportation front and back, use micro-spraying before, has stoped the expansion of coating surface crackle effectively, has repaired the crackle that coating surface has produced, the service life of having improved coating component and structure.
Accompanying drawing explanation
Fig. 1 is the micro-fillet treating apparatus of crack tip schematic diagram;
Fig. 2 is flow chart of the present invention;
Fig. 3 is SEM surface topography map after the micro-fillet of coating sample;
Fig. 4 is the SEM surface topography map that forms through-wall crack without the coating sample of micro-fillet processing;
Fig. 5 is the coating sample SEM surface topography map after micro-spraying;
In figure, 1-pressure hammer, 2-crossbeam, 3-adjusting nut, the nested bar of 4-, 5-pressure head, the 6-longitudinal axis (spring), 7-objective table folder.
The specific embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is further described; but be not limited to this; every technical solution of the present invention is modified or is equal to replacement, and not departing from the spirit and scope of technical solution of the present invention, all should be encompassed in protection scope of the present invention.
The specific embodiment one: present embodiment provides a kind of coating life-prolonging method that utilizes micro-fillet and micro-spraying to stop brittle coating Crack Extension, and as shown in Figure 2, concrete steps are as follows:
The detection of coating surface before step 1, transportation.
Utilize naked eyes or magnifying glass to observe part or the body structure surface of applying coating, whether have the crackle of the above micron level of 60 μ m to detect coating surface; Utilize acoustical signal to detect coating inner case simultaneously, to survey larger crackle (detection record, does not process, and size is in tens micron dimensions), detection case is carried out to record.If find that in testing process it is the crackle of micron level that coating surface exists length, carries out step 2; If do not find that in detection coating surface exists the crackle of micron level, directly carry out step 3.
As found in the testing process of step 1, length is the crackle of micron level, can be under light microscope be that diamond, diameter are that the pressure head of 100 microns knocks crack tip by material, produce micro-fillet (concrete device is shown in Fig. 1) at crack tip.
Part or structure are positioned in the chest that special plastic foam etc. makes compared with softwood matter and are transported, make the shape of casing identical with part or structure as far as possible, or fill soft cushion between casing and object to be transported.Transportation keeps transport vehicle at the uniform velocity as far as possible, selects the good travel of road conditions, to reduce the destruction of transportation to coating surface.
Before step 4, storage, detect.
Complete after transportation, before part or the storage of structure warehouse-in, utilize light microscope to detect for the second time to coating surface, utilize acoustical signal to detect coating inner case simultaneously, the testing result recording is compared, thereby optimize later transportation in testing result and step 1.If find that in testing process it is the crackle of the above micron level of 60 μ m that coating surface exists length, carries out carrying out step 5 after micro-fillet processing according to the method for step 2; If do not find that in detection coating surface exists the crackle of micron level, directly carry out step 5.
Part or structure warehouse-in are stored, detected for the third time before use, if find the phenomenon of the above micron order Crack Extension of coating surface 60 μ m in testing process, utilize before use the method for micro-spraying or micro-brushing to fill crackle.Under light microscope, the ceramic particle identical with coating composition of mixed adhesive sprayed or brushes the inside crack in coating.
The specific embodiment two: present embodiment, for an actual coating sample case, is analyzed the formulation with life-prolonging method.
For the SiO that utilizes sol-gal process to prepare on Fe-Ni high temperature alloy
2coating, utilizes wire cutting method to cut into the sample of about 10mm × 10mm, with acetone, sample is cleaned in supersonic wave cleaning machine to 10～15min.Pretreated sample is divided into 6 groups according to the transportation that will carry out and processing mode, and 5 every group, the processing mode of concrete group sample is as shown in table 1.
Table 1 sample pretreating mode
Under light microscope, when 400 times of multiplication factors, coating is detected, owing to being freshly prepd coating, do not find the crackle of micron level at coating surface.
1st, 2 groups of samples utilize mechanical shock method to simulate the shock of coating transportation coating surface and transport vehicle, and the weight that service property (quality) is 1g, from highly falling apart from coating surface 0.1m, after 3 times, detects coating surface situation repeatedly.
3rd, 4 groups of samples are first with 2 filter paper parcel surfaces that are converted into 2 foldings, and simulated cushioned material re-uses quality and be the weight of 1g from highly falling apart from coating surface 0.1m, repeatedly, after 3 times, detects coating surface situation.Testing result surface, cushion mass-energy obviously reduces impacts destruction that coating surface is brought, is embodied in reducing of the minimizing of crack number and crack length, width.
Under light microscope, (amplify 400 times) and observe each group of sample coating surface, the micro-fillet passivation of crack tip (Fig. 3) with Fig. 1 shown device at the 1st, 3,5 groups of samples.To after six groups of sample vacuum sealing tubes, put into tube furnace, carry out thermal cycle experiment simulation storage process.Thermal circulation parameters is: 250 ℃ of low temperature, and 450 ℃ of high temperature, high low temperature is respectively incubated 1h, circulates altogether 30 times.From tube furnace, take out six groups of samples.
Under light microscope, (amplify 400 times) and observe each group of specimen surface, obviously find the sample (the 1st, 3,5 groups) through micro-fillet passivation crack tip, coating surface damaged degree is much smaller than the control group sample (the 2nd, 4,6 groups) that does not pass through micro-fillet passivation.Experienced the 2nd group of sample that direct impact test is not used micro-fillet passivation, producing coating " isolated island " and the phenomenon (Fig. 4) of coating shedding occurs because of through-wall crack intersection has appearred in surface.
Preparation SiO
2micro mist also mixes with adhesive, uses micro-spraying method to be sprayed at coating surface (Fig. 5), can obviously improve the serviceability of coating.
Claims (5)
1. utilize micro-spraying and micro-fillet to stop the coating life-prolonging method of brittle coating Crack Extension, it is characterized in that described method step is as follows:
The detection of coating surface before step 1, transportation
Utilize naked eyes or magnifying glass to observe part or the body structure surface of applying coating, whether there is the crackle of micron level to detect coating surface: utilize acoustical signal to detect coating inner case simultaneously, detection case is carried out to record: if find that in testing process coating surface exists crackle, carry out step 2: if do not find that in detection coating surface exists crackle, directly carry out step 3:
Step 2, micro-fillet passivation crack tip
Knock crack tip, produce micro-fillet at crack tip:
Step 3, transportation
Part or structure are positioned in the chest that special softwood matter makes and are transported, or fill soft cushion between casing and object to be transported, and guarantee that means of transport steadily travels at the uniform speed, reduce jolting in transportation:
Before step 4, storage, detect
Complete after transportation, before part or the storage of structure warehouse-in, utilize light microscope to detect for the second time to coating surface, utilize acoustical signal to detect coating inner case simultaneously, the testing result recording in testing result and step 1 is compared, thereby optimize later transportation: if find that in testing process coating surface exists the crackle of micron level, carry out carrying out step 5 after micro-fillet processing according to the method for step 2: if do not find that in detection coating surface exists the crackle of micron level, directly carry out step 5:
Step 5, micro-spraying or micro-brushing
Part or structure warehouse-in are stored, detected for the third time before use, if find the phenomenon of coating surface micron order Crack Extension in testing process, utilize before use the method for micro-spraying or micro-brushing to fill crackle.
2. the coating life-prolonging method that utilizes micro-spraying and micro-fillet to stop brittle coating Crack Extension according to claim 1, is characterized in that the crack width of described coating surface is more than 60 μ m.
3. the coating life-prolonging method that utilizes micro-spraying and micro-fillet to stop brittle coating Crack Extension according to claim 1, the production method that it is characterized in that described micro-fillet is: under light microscope, knock crack tip with pressure head, produce micro-fillet at crack tip.
4. the coating life-prolonging method that utilizes micro-spraying and micro-fillet to stop brittle coating Crack Extension according to claim 3, the material that it is characterized in that pressure head is diamond, diameter is 100 microns.
5. the coating life-prolonging method that utilizes micro-spraying and micro-fillet to stop brittle coating Crack Extension according to claim 1, it is characterized in that described crackle fill method is: under light microscope, the ceramic particle identical with coating composition of mixed adhesive sprayed or brush the inside crack in coating.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10177258A (en) * | 1996-12-17 | 1998-06-30 | Fuji Xerox Co Ltd | Production of electrophotographic photoreceptor |
| CN101406879A (en) * | 2007-10-12 | 2009-04-15 | 天顺(苏州)金属制品有限公司 | Technique for inspecting oil paint coating on surface of wind tower body |
| CN101698189A (en) * | 2009-10-16 | 2010-04-28 | 青特集团有限公司 | Zinc-galvanizing and paint-spraying coating process for submerged boat carrier |
| CN101804401A (en) * | 2010-03-29 | 2010-08-18 | 扬帆集团股份有限公司 | Painting method of seawater ballast tank |
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- 2014-03-19 CN CN201410102374.4A patent/CN103817056B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10177258A (en) * | 1996-12-17 | 1998-06-30 | Fuji Xerox Co Ltd | Production of electrophotographic photoreceptor |
| CN101406879A (en) * | 2007-10-12 | 2009-04-15 | 天顺(苏州)金属制品有限公司 | Technique for inspecting oil paint coating on surface of wind tower body |
| CN101698189A (en) * | 2009-10-16 | 2010-04-28 | 青特集团有限公司 | Zinc-galvanizing and paint-spraying coating process for submerged boat carrier |
| CN101804401A (en) * | 2010-03-29 | 2010-08-18 | 扬帆集团股份有限公司 | Painting method of seawater ballast tank |
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