CN111965104A - Method for evaluating adhesive strength of metal band saw blade coating - Google Patents
Method for evaluating adhesive strength of metal band saw blade coating Download PDFInfo
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- CN111965104A CN111965104A CN202010798914.2A CN202010798914A CN111965104A CN 111965104 A CN111965104 A CN 111965104A CN 202010798914 A CN202010798914 A CN 202010798914A CN 111965104 A CN111965104 A CN 111965104A
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- saw blade
- band saw
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- 238000000576 coating method Methods 0.000 title claims abstract description 67
- 239000011248 coating agent Substances 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000002184 metal Substances 0.000 title claims abstract description 16
- 239000000853 adhesive Substances 0.000 title claims abstract description 6
- 230000001070 adhesive effect Effects 0.000 title claims abstract description 6
- 239000000758 substrate Substances 0.000 claims abstract description 19
- 230000035939 shock Effects 0.000 claims abstract description 16
- 238000010521 absorption reaction Methods 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims description 13
- 239000011521 glass Substances 0.000 claims description 5
- 239000003973 paint Substances 0.000 claims description 2
- 229920005372 Plexiglas® Polymers 0.000 claims 1
- 239000004926 polymethyl methacrylate Substances 0.000 claims 1
- 238000011156 evaluation Methods 0.000 abstract description 2
- 239000000523 sample Substances 0.000 description 22
- 238000005229 chemical vapour deposition Methods 0.000 description 5
- 239000010432 diamond Substances 0.000 description 5
- 229910003460 diamond Inorganic materials 0.000 description 4
- 239000002390 adhesive tape Substances 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000007373 indentation Methods 0.000 description 3
- 238000005240 physical vapour deposition Methods 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention relates to a method for evaluating the adhesive strength of a coating of a metal band saw blade, comprising the following steps: providing a band saw blade sample to be tested; carrying out laser impact on the band saw blade sample to be tested from the transparent constraint layer to the direction of the coating, adjusting the pulse energy of the laser beam according to a fixed step length s until the impacted part of the coating of the band saw blade sample to be tested protrudes or falls off, and recording the minimum pulse energy E of the protrusion or the fall off of the coating of the band saw blade sample to be tested; providing a pressure sensor, and sequentially covering an absorption layer and a transparent constraint layer as described in S2 on the surface of a pressure sensitive element of the pressure sensor; then, laser shock is carried out on the pressure sensitive element by adopting a laser beam with pulse energy of E, and pressure P borne by the pressure sensor is collected; and constructing a finite element model of the band saw blade sample to be measured, and calculating and analyzing to obtain the maximum tensile stress at the interface of the substrate and the coating in the finite element model, namely the bonding strength of the coating of the metal band saw blade. The method has wide application range and can realize evaluation on common coatings and hard coatings.
Description
Technical Field
The invention relates to a method for evaluating the bonding strength of a metal band saw blade coating, and belongs to the field of saw blade coating bonding strength detection.
Background
Coatings synthesized by Physical Vapor Deposition (PVD) or Chemical Vapor Deposition (CVD) have excellent characteristics of high hardness, good wear resistance, high thermal conductivity, and the like, and are widely used in metal band saw blades. In actual use, the bond strength of the coating to the metal substrate is critical to the useful life of its metal band saw blade.
At present, scratch or indentation methods are often used to measure the adhesion strength of a coating to a substrate. For coatings of general hardness, scoring or indentation methods are effective in evaluating the bond strength, but for coatings of ceramic or diamond, the above methods are less suitable. This is because the hardness of hard coatings such as ceramics or diamonds is very high, and when the bonding strength of the coatings is measured by a scratch or indentation method, a diamond probe or indenter is easily worn, so that the service life of the probe or indenter is greatly shortened, thereby increasing the detection cost. Therefore, it is urgently needed to invent a method for effectively evaluating the bonding strength of the hard coating.
Disclosure of Invention
In view of the deficiencies of the prior art, it is an object of the present invention to provide a novel method for evaluating the bond strength of a coating on a metal band saw blade.
The technical scheme of the invention is as follows:
a method of evaluating the bond strength of a metal band saw blade coating comprising the steps of:
s1, providing a band saw blade sample to be tested; the band saw blade sample to be tested comprises a substrate and a coating deposited on one surface of the substrate;
s2, covering an absorption layer on the other surface of the substrate, covering a transparent restraint layer on the absorption layer, carrying out laser impact on the band saw blade sample to be tested from the transparent restraint layer to the direction of the coating, adjusting the pulse energy of the laser beam according to a fixed step length S until the impacted part of the coating of the band saw blade sample to be tested protrudes or falls off, and recording the minimum pulse energy E of the protrusion or the fall off of the coating of the band saw blade sample to be tested;
wherein s is 0.05-0.1J;
s3, providing a pressure sensor, and sequentially covering the surface of a pressure sensitive element of the pressure sensor with the absorption layer and the transparent constraint layer as described in S2; then, a pressure sensor is arranged on a bottom plate, a transparent restraint layer on a pressure sensitive element faces upwards, laser shock is carried out on the pressure sensitive element by adopting a laser beam with pulse energy of E, and pressure P borne by the pressure sensor is collected;
wherein, the spot size and the pulse width of the laser beam used in S3 and the laser beam used in S2 are the same;
s4, constructing a finite element model of the band saw blade sample to be tested, setting material properties and boundary conditions of the finite element model according to the material and physical state of the band saw blade to be tested, setting shock wave load of the finite element model according to the laser pulse width and the pressure P, solving stress of the finite element model, and extracting the maximum tensile stress at the interface of the substrate and the coating in the finite element model, namely the bonding strength of the coating of the metal band saw blade.
Further, in the step S1, the band saw blade to be measured is cut into blocks, and a sample of the band saw blade to be measured is obtained.
Optionally, the coating is formed on the substrate by physical vapor deposition or chemical vapor deposition.
Further, in S1, the substrate has a thickness of 0.65 to 1.6mm, further 0.8 to 1.2 mm.
Further, in S2, performing laser shock on the band saw blade sample to be tested, and observing whether the shock part of the coating bulges or falls off or not while performing laser shock;
if the impacted part of the coating protrudes or falls off, reducing the pulse energy of the laser beam according to a fixed step length s, moving the laser beam to the non-impact position of the band saw blade sample to be tested, performing laser impact again, repeating the steps until the impacted part of the coating does not protrude or fall off, and recording the minimum pulse energy E of the protrusion or fall off of the coating of the band saw blade sample to be tested (at the moment, E is the pulse energy of the laser beam before the protrusion and the fall off are not generated);
and if the impacted part of the coating does not bulge or fall off, increasing the pulse energy of the laser beam according to the fixed step length s, moving the laser beam to the non-impact position of the band saw blade sample to be tested, performing laser impact again, repeating the steps until the impacted part of the coating bulges, and recording the minimum pulse energy E of the bulge or fall off of the coating of the band saw blade sample to be tested.
Further, the absorption layer is a black adhesive tape or a black paint layer.
Further, the thickness of the absorption layer is 50 to 200 μm, and further 80 to 150 μm.
Further, the thickness of the transparent restraint layer is 0.5mm-2mm, and further 0.8-1.5 mm; preferably, the transparent constraining layer (5) is K9 glass.
Further, the diameter of the laser beam is 1-3mm, the pulse width is 3-10ns, and the pulse energy is less than or equal to 4J, and further, the diameter of the laser beam is 1.5-2.5mm, the pulse width is 5-8ns, and the pulse energy is 1-3J.
Further, the bottom plate is made of organic glass.
Further, the thickness of the bottom plate is 5-10 mm.
The method has wide application range, and can not only realize the evaluation of the adhesive strength of the hard coating of the metal band saw blade, but also evaluate the adhesive strength of a common coating.
The invention adopts short pulses (ns level) and high power density (GW/cm)2Level) laser irradiates an absorption layer to cause plasma explosion on the surface of the material, so that shock waves with the GPa level are formed, the shock waves are transmitted to the interior of the material under the action of a transparent constraint layer, the shock waves are transmitted in the material in a compression wave mode firstly, but are converted into tensile waves after being reflected by the free surface of the material, the shock waves are continuously converted into tension waves along with the surface reflection, the tension-compression and tension-compression changes are continuously carried out, when the tension wave stress value exceeds the tensile strength of a coating bonding interface, the coating is raised or fallen off, the method is not limited by the type of the coating, and various coatings can be well impacted. First obtaining the impact on the coatingThe method has the advantages that the method is wide in application range, not only can the adhesion strength of the hard coating of the metal band saw blade be evaluated, but also the adhesion strength of a common coating can be evaluated.
Drawings
FIG. 1 is a schematic illustration of laser impact of a band saw blade sample under test.
Fig. 2 is a schematic diagram of a laser shock wave pressure test.
FIG. 3 is a schematic illustration of the bulge created in the impacted portion of the coating.
FIG. 4 is a diagram of a finite element model of embodiment 1.
FIG. 5 is a cloud image obtained after finite element calculations.
FIG. 6 is a graph of stress at the interface of the coating and the substrate as a function of time.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. For convenience of description, the words "upper", "lower", "left" and "right" in the following description are used only to indicate the correspondence between the upper, lower, left and right directions of the drawings themselves, and do not limit the structure.
Taking a saw blade with D6A spring steel as a backing material and a chemical vapor deposition diamond coating as an example, the method comprises the following steps:
(1) cutting a metal saw blade with the thickness of 1mm and the width of 100mm into small blocks with the size of 300 multiplied by 100mm, taking the small blocks as a substrate 1, and synthesizing a diamond coating 2 with the thickness of 100 microns on one surface of the substrate by adopting chemical vapor deposition to manufacture a band saw blade sample to be tested;
(2) covering a black adhesive tape with the thickness of 100 microns on the uncoated surface of a band saw blade sample 3 to be measured to serve as an absorption layer 4, and covering K9 glass with the thickness of 1mm on the black adhesive tape to serve as a restraint layer 5;
(3) adjusting the spot size of the laser beam 6 to be 2mm, the pulse width to be 5ns, and adjusting the laser pulse energy to be 2J; the band saw blade sample 3 to be tested is impacted, and the falling off of the impacted part 7 of the coating 2 is observed;
(4) reducing the pulse energy of the laser beam 6 according to the fixed step length s =0.05J, moving the laser beam 6 to the non-impacted position of the band saw blade sample 3 to be tested, repeating the step (3) to impact the band saw blade sample 3 to be tested, and finding that the impacted part 7 of the coating 2 is not bulged when the pulse energy is reduced to 0.9J; the impacted portion 7 of the coating 2 is embossed and the minimum pulse energy of the laser beam 6 is 0.95J.
(5) Covering an absorbing layer 4 which is the same as that in the step (2) on the pressure sensor 8, covering a transparent constraint layer 5 which is the same as that in the step (2) on the black absorbing layer, padding a layer of organic glass (bottom plate 9) below the pressure sensor 8, adjusting the spot size of the laser beam 6 to be 2mm, adjusting the pulse width to be 5ns, adjusting the laser pulse energy to be 0.95J, impacting the pressure sensor 8, detecting the pressure measured by the pressure sensor by adopting a pressure sensor data processing system 10, and measuring the maximum pressure to be 1.2 GPa.
(6) As shown in fig. 4, a finite element model of a band saw blade sample 3 to be measured is established in ABAQUS software, material properties in the finite element model are set according to a material used by the band saw blade sample 3 to be measured, the material properties include material density, young modulus, poisson ratio and stress-strain relationship, a shock wave load of the finite element model is set according to laser pulse width and pressure P (1.2 GPa), and stress of the finite element model is solved. Fig. 5 shows a stress cloud of the finite element model obtained by calculation. As shown in fig. 6, a tensile stress at the interface of the substrate 1 and the coating 2 in the finite element model is extracted as a function of time, the maximum stress is 250MPa, and the bonding strength of the coating 2 and the substrate 1 is 250 MPa.
The foregoing examples are set forth to illustrate the present invention more clearly and are not to be construed as limiting the scope of the invention, which is defined in the appended claims to which the invention pertains, as modified in all equivalent forms, by those skilled in the art after reading the present invention.
Claims (10)
1. A method of evaluating the bond strength of a metal band saw blade coating comprising the steps of:
s1, providing a band saw blade sample to be tested; the band saw blade sample to be tested comprises a substrate (1) and a coating (2) deposited on one surface of the substrate (1);
s2, covering an absorption layer (4) on the other surface of the substrate (1), covering a transparent restraint layer (5) on the absorption layer (4), carrying out laser impact on the band saw blade sample to be tested in the direction from the transparent restraint layer (5) to the coating (2), adjusting the pulse energy of a laser beam according to a fixed step length S until the impacted part (7) of the coating (2) of the band saw blade sample to be tested protrudes or falls off, and recording the minimum pulse energy E of the protrusion or fall-off of the coating (2) of the band saw blade sample to be tested;
wherein s is 0.05-0.1J;
s3, providing a pressure sensor (8), and sequentially covering the surface of a pressure sensitive element of the pressure sensor (8) with the absorption layer (4) and the transparent constraint layer (5) as described in S2; then, the pressure sensor (8) is placed on the bottom plate (9), the transparent constraint layer (5) on the pressure sensitive element faces upwards, laser impact is carried out on the pressure sensitive element by adopting a laser beam with pulse energy of E, and pressure P borne by the pressure sensor (8) is collected;
wherein, the spot size and the pulse width of the laser beam used in S3 and the laser beam used in S2 are the same;
s4, constructing a finite element model of the band saw blade sample to be tested, setting material properties and boundary conditions of the finite element model according to the material and physical state of the band saw blade to be tested, setting shock wave load of the finite element model according to the pulse width and pressure P of the laser beam, solving stress of the finite element model, and extracting the maximum tensile stress at the interface of the substrate (1) and the coating (2) in the finite element model, namely the adhesive strength of the coating of the metal band saw blade.
2. The method as claimed in claim 1, wherein the band saw blade to be measured is cut into pieces to obtain the band saw blade sample to be measured in S1.
3. The method according to claim 1, wherein in S1, the substrate (1) has a thickness of 0.65-1.6 mm.
4. The method according to claim 1, characterized in that in S2, laser shock is carried out on the band saw blade sample to be tested, and whether the shock part (7) of the coating (2) bulges or falls off is observed while the laser shock is carried out;
if the impacted part (7) of the coating (2) protrudes or falls off, reducing the pulse energy of the laser beam according to a fixed step length s, moving the laser beam to the non-impact position of the band saw blade sample to be tested, performing laser impact again, repeating the steps until the impacted part (7) of the coating (2) does not protrude or fall off, and recording the minimum pulse energy E of the protrusion or fall off of the coating (2) of the band saw blade sample to be tested;
if the impacted part (79) of the coating (2) does not bulge or fall off, increasing the pulse energy of the laser beam according to a fixed step length s, moving the laser beam to the non-impact position of the band saw blade sample to be tested, performing laser impact again, repeating the steps until the impacted part (9) of the coating (2) bulges, and recording the minimum pulse energy E of the bulge or fall-off of the coating (2) of the band saw blade sample to be tested.
5. The method according to claim 1, characterized in that the absorbing layer (4) is a black tape or a black paint layer.
6. The method according to claim 1, characterized in that the thickness of the absorption layer (4) is 50-200 μm.
7. A method according to claim 1, wherein the thickness of the transparent constraining layer (5) is 0.5-2 mm; preferably, the transparent constraining layer (5) is K9 glass.
8. The method according to any one of claims 1 to 7, wherein the laser beam has a spot diameter of 1 to 3mm, a pulse width of 3 to 10ns, and a pulse energy of 4J or less.
9. The method according to any one of claims 1 to 7, wherein the base plate (9) is plexiglas.
10. A method according to any one of claims 1-7, characterized in that the thickness of the bottom plate (9) is 5-10 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010798914.2A CN111965104A (en) | 2020-08-11 | 2020-08-11 | Method for evaluating adhesive strength of metal band saw blade coating |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010798914.2A CN111965104A (en) | 2020-08-11 | 2020-08-11 | Method for evaluating adhesive strength of metal band saw blade coating |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN109187336A (en) * | 2018-08-29 | 2019-01-11 | 中国人民解放军空军工程大学 | A kind of magnetostriction adhesive tape for the detection of laser blast wave binding force |
| CN109932425A (en) * | 2019-04-18 | 2019-06-25 | 广东工业大学 | A kind of method and apparatus that laminated chips adhesive strength compares |
-
2020
- 2020-08-11 CN CN202010798914.2A patent/CN111965104A/en active Pending
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|---|---|---|---|---|
| JPH11142319A (en) * | 1997-11-13 | 1999-05-28 | Natl Res Inst For Metals | Method for measuring exfoliation and adhesion of surface coating |
| CN1360204A (en) * | 2001-11-30 | 2002-07-24 | 江苏大学 | Laser impact method and equipment for measuring binding stregnth of interface |
| CN1405553A (en) * | 2002-10-30 | 2003-03-26 | 江苏大学 | Method and apparatus for measuring sub-static laser scratch of interface jointing strength |
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