CN111426627A - Method for measuring binding force of metal matrix coating - Google Patents
Method for measuring binding force of metal matrix coating Download PDFInfo
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- CN111426627A CN111426627A CN201910022909.XA CN201910022909A CN111426627A CN 111426627 A CN111426627 A CN 111426627A CN 201910022909 A CN201910022909 A CN 201910022909A CN 111426627 A CN111426627 A CN 111426627A
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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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Abstract
The application discloses a method for measuring the binding force of a metal matrix coating. The method for measuring the binding force of the metal matrix coating comprises the following steps: a) applying a coating to a sample made of a metal substrate; b) bonding the coated region of the sample to the stretch rod using glue; c) respectively clamping the sample and the stretching rod to two ends of a tensile testing machine; d) and starting a tensile testing machine to measure the tensile force when the sample is separated from the tensile rod. The method for measuring the bonding force of the metal matrix coating can realize measurement of larger bonding force of the coating.
Description
Technical Field
The invention relates to the field of automobiles, in particular to a method for measuring the binding force of a metal matrix coating.
Background
With the development of the technology, the requirements on the coating technology are more and more strict, wherein one of the indexes is the binding force of the coating. In general, the adhesion of coatings is measured by cross-hatch method, tape method, friction method, thermal shock test, bending test, etc. as shown in GB5270, ISO4524/5-1985, GB12305.5-90, etc., but the adhesion strength of these coatings is evaluated qualitatively, and it is understood from the end result that the adhesion strength of the coatings is not as large as several tens of MPa.
The cylinder sleeve-free technology of the engine cylinder is taken as an example, the coating is in direct contact with the piston ring, the requirements of certain oxidation rate, porosity, high temperature resistance, wear resistance and the like need to be met, the bonding force of the coating is not lower than 25MPa, the conventional detection tool and means are not suitable for the coating with high-strength bonding force, and the specific numerical value of the bonding force is difficult to calculate under normal conditions.
Disclosure of Invention
The invention provides a method for measuring the binding force of a metal matrix coating, which can realize the measurement of the binding force of a larger coating.
The invention provides a method for measuring the binding force of a metal matrix coating, which comprises the following steps:
a) applying a coating to a sample made of a metal substrate;
b) bonding the coated region of the sample to the stretch rod using glue;
c) respectively clamping the sample and the stretching rod to two ends of a tensile testing machine;
d) and starting a tensile testing machine to measure the tensile force when the sample is separated from the tensile rod.
According to one aspect of the invention, the method for measuring the bonding force of the metal matrix coating further comprises the following steps:
e) the tensile strength between the sample and the coating was calculated from the stretching force at the time when the sample was separated from the stretching rod and the area of the coating applied on the sample.
According to one aspect of the present invention, in the method for measuring the bonding force of the metal matrix coating, in the step d), when the sample is separated from the stretching rod, a part of the coating is located on the sample, and a part of the coating is located on the stretching rod.
According to the method for measuring the bonding force of the metal matrix coating, provided by one aspect of the invention, the shape of the sample is matched with the shape of a clamp of a tensile testing machine.
According to the method for measuring the binding force of the metal matrix coating, which is provided by one aspect of the invention, the cross section of the sample is quadrilateral.
According to the method for measuring the bonding force of the metal matrix coating, which is provided by one aspect of the invention, the stretching rod is a screw rod.
According to the method for measuring the binding force of the metal matrix coating, provided by one aspect of the invention, the screw is provided with a thread section and a head section, the thread section can be matched with internal threads of a clamping end of a tensile testing machine, and the head section is circular.
According to the method for measuring the binding force of the metal matrix coating, provided by one aspect of the invention, the sample is provided with a circular groove, and the inner diameter of the circular groove is equal to the outer diameter of the head section.
According to the method for measuring the bonding force of the metal matrix coating, in the step b), after glue is applied, an O-shaped ring matched with the shape of the circular groove is filled in the circular groove.
Drawings
The disclosure of the present invention is illustrated with reference to the accompanying drawings. It is to be understood that the drawings are designed solely for the purposes of illustration and not as a definition of the limits of the invention. In the drawings, like reference numerals are used to refer to like parts unless otherwise specified. Wherein:
FIG. 1 schematically shows a sample;
fig. 2 schematically shows a state in which the sample is combined with the stretching rod.
Detailed Description
It is easily understood that according to the technical solution of the present invention, a person skilled in the art can propose various alternative structures and implementation ways without changing the spirit of the present invention. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical aspects of the present invention, and should not be construed as all of the present invention or as limitations or limitations on the technical aspects of the present invention.
In the following description, various parameters and components are described for different configurations of embodiments, and these specific parameters and components are only by way of example and do not limit the embodiments of the present application.
According to an embodiment of the invention, the method for measuring the bonding force of the metal matrix coating comprises the following steps: a) applying a coating (refer to a hatched area in fig. 1) to a sample 1 made of a metal substrate; b) the coated area of sample 1 was bonded to the stretch rod 2 using glue 3; c) respectively clamping the sample and the stretching rod to two ends of a tensile testing machine; d) and starting a tensile testing machine to measure the tensile force when the sample is separated from the tensile rod. In this way, a measurement of the bonding force of a high-strength coating can be achieved in a simple manner.
The method for measuring the bonding force of the metal matrix coating can also comprise the following steps: e) from the stretching force F at the time of separation of the sample from the stretching rod and the area S of the coating applied on the sample, the tensile strength between the sample and the coating was calculated in combination with the formula P = F/S.
Advantageously, in step d), a partial coating is located on the sample and a partial coating on the stretch rod when the sample is separated from the stretch rod. At this time, the tensile force applied by the tensile tester causes the coating layer adhered to the surface of the sample to be broken just by the ultimate tensile stress.
The appearance of sample and the shape phase-match of tensile testing machine's anchor clamps can avoid using extra anchor clamps like this in order to the clamping the sample. For example, the cross section of the sample is quadrilateral, and the sample can be conveniently and directly clamped in a tensile testing machine.
Referring to fig. 2, the stretching rod is a screw. The screw has a threaded section 21 that is capable of mating with an internal thread of the clamping end of the tensile testing machine (e.g., the threads in the threaded section are standard threads) and a head section 22 that is circular. The sample is provided with a circular groove with an inner diameter equal to that of the sampleThe outer diameter of the head section of the screw, the surface of the portion of the sample surrounded by the circular groove, is able to conform to the head section of the screw. In step b), after the glue is applied, an O-ring 4 matching the shape of the circular groove is filled into the circular groove. The size of the groove is consistent with that of the O-shaped ring which can be placed in the groove, the part of the sample which is surrounded by the groove is the surface of the coating to be measured, and the area S = pi r2。
In production, a large sample (as shown in fig. 1) having a plurality of circular grooves (i.e., having a plurality of regions to be tested) may be first produced, and then the large sample may be cut into samples each having only one circular groove for testing.
After the test is finished, the screw can be recycled by removing the glue attached to the surface of the screw (for example, by grinding), so that the material is saved.
An example of a test using the method for measuring the bonding force of a metal matrix coating according to the present invention is: the surface to be measured of the sample is fully coated with high-strength glue (the strength is higher than the binding force of the coating to be measured), the O-shaped ring is placed in the groove to prevent the glue from flowing out, the coating of the surface area to be measured can be separated from the coatings of other areas by the O-shaped ring, the head section of the screw rod is also fully coated with the glue, and the head section of the screw rod is bonded with the two parts of the area to be measured of the sample. When the experiment is carried out on the stretcher, the thread of the clamping screw extends into the internal thread of the stretcher to be matched with the thread of the stretcher, and the sample is clamped by the clamp on the other side of the stretcher. And respectively loading the sample and the screw rod in opposite directions through a stretching machine, and obtaining a final pull-off force F curve after the sample is separated from the screw rod.
Another example of a test using the method for measuring the bonding force of a metal matrix coating according to the present invention is: cutting a sample to be tested into a 40 mm-40 mm quadrilateral sample block, processing a circular groove with the width of 5mm and the depth of 1.5mm at the center of the sample block, coating glue on the surface of the head section of the bolt and the surface of the quadrilateral cutting block with the diameter of 16mm, pulling off the bolt by using a stretcher, and partially stripping the coating from the surface of the sample until the experiment is successful, or reworking the bolt. And finally, calculating the bonding strength of the coating and judging whether the coating meets the requirements.
According to the method for measuring the bonding force of the metal matrix coating, the calculation of the bonding force of the high-strength coating is realized on the basis of a tensile testing machine (the proper tonnage of a mechanical tensile machine is selected according to the bonding force of the coating), and the defect that the bonding force of the high-strength coating cannot be accurately measured is overcome. The method can be used for measuring the large bonding force of the metal surface coating of the metal matrix or the nonmetal surface coating of the metal matrix, such as parts and processes related to explosion spraying.
The technical scope of the present invention is not limited to the above description, and those skilled in the art can make various changes and modifications to the above-described embodiments without departing from the technical spirit of the present invention, and such changes and modifications should fall within the protective scope of the present invention.
Claims (9)
1. A method for measuring the bonding force of a metal matrix coating is characterized by comprising the following steps:
a) applying a coating to a sample made of a metal substrate;
b) bonding the coated region of the sample to the stretch rod using glue;
c) respectively clamping the sample and the stretching rod to two ends of a tensile testing machine;
d) and starting a tensile testing machine to measure the tensile force when the sample is separated from the tensile rod.
2. The method of claim 1, wherein the method further comprises the steps of:
e) the tensile strength between the sample and the coating was calculated from the stretching force at the time when the sample was separated from the stretching rod and the area of the coating applied on the sample.
3. The method of claim 1, wherein in step d), a portion of the coating is on the sample and a portion of the coating is on the stretch rod while the sample is separated from the stretch rod.
4. The method of claim 1, wherein the shape of the sample is matched with the shape of the fixture of the tensile testing machine.
5. The method of claim 4, wherein the cross-section of the sample is quadrilateral.
6. The method of claim 1, wherein the stretching rod is a screw.
7. The method for measuring the bonding force of the metal matrix coating according to claim 6, wherein the screw has a threaded section and a head section, the threaded section can be matched with an internal thread of a clamping end of the tensile testing machine, and the head section is circular.
8. The method of claim 7, wherein the sample has a circular groove therein having an inner diameter equal to an outer diameter of the head section.
9. The method of claim 8, wherein in step b), an O-ring matching the shape of the circular groove is filled in the circular groove after the glue is applied.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910022909.XA CN111426627A (en) | 2019-01-10 | 2019-01-10 | Method for measuring binding force of metal matrix coating |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910022909.XA CN111426627A (en) | 2019-01-10 | 2019-01-10 | Method for measuring binding force of metal matrix coating |
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| CN111426627A true CN111426627A (en) | 2020-07-17 |
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| CN201910022909.XA Pending CN111426627A (en) | 2019-01-10 | 2019-01-10 | Method for measuring binding force of metal matrix coating |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4876896A (en) * | 1986-06-16 | 1989-10-31 | I.W. Industries, Inc. | Method of testing protective encapsulation of structural members |
| JP2007163147A (en) * | 2005-12-09 | 2007-06-28 | Toppan Printing Co Ltd | Method of measuring adhesion between resist film and substrate |
| DE102013013161A1 (en) * | 2013-08-08 | 2014-04-10 | Daimler Ag | Method of testing adhesiveness and film strength of surface layer formed on metal substrate used in cylinder crankcase of combustion engine, involves measuring tensile force applied for detaching surface layer from substrate |
| TWI513971B (en) * | 2014-09-24 | 2015-12-21 | Inventec Corp | Test piece and method for tensile testing using the same |
| CN105486632A (en) * | 2015-12-28 | 2016-04-13 | 银邦金属复合材料股份有限公司 | Measuring method for bonding strength of metallic composite, sample and sample manufacturing method |
| CN205941316U (en) * | 2016-08-09 | 2017-02-08 | 安庆帝伯格茨缸套有限公司 | Cylinder liner cohesion accredited testing organization |
-
2019
- 2019-01-10 CN CN201910022909.XA patent/CN111426627A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4876896A (en) * | 1986-06-16 | 1989-10-31 | I.W. Industries, Inc. | Method of testing protective encapsulation of structural members |
| JP2007163147A (en) * | 2005-12-09 | 2007-06-28 | Toppan Printing Co Ltd | Method of measuring adhesion between resist film and substrate |
| DE102013013161A1 (en) * | 2013-08-08 | 2014-04-10 | Daimler Ag | Method of testing adhesiveness and film strength of surface layer formed on metal substrate used in cylinder crankcase of combustion engine, involves measuring tensile force applied for detaching surface layer from substrate |
| TWI513971B (en) * | 2014-09-24 | 2015-12-21 | Inventec Corp | Test piece and method for tensile testing using the same |
| CN105486632A (en) * | 2015-12-28 | 2016-04-13 | 银邦金属复合材料股份有限公司 | Measuring method for bonding strength of metallic composite, sample and sample manufacturing method |
| CN205941316U (en) * | 2016-08-09 | 2017-02-08 | 安庆帝伯格茨缸套有限公司 | Cylinder liner cohesion accredited testing organization |
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Application publication date: 20200717 |