CN114812901A - Method and device for measuring stress of thermal spraying coating - Google Patents
Method and device for measuring stress of thermal spraying coating Download PDFInfo
- Publication number
- CN114812901A CN114812901A CN202210410259.8A CN202210410259A CN114812901A CN 114812901 A CN114812901 A CN 114812901A CN 202210410259 A CN202210410259 A CN 202210410259A CN 114812901 A CN114812901 A CN 114812901A
- Authority
- CN
- China
- Prior art keywords
- coating
- stress
- substrate
- measuring
- measuring device
- 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.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0047—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes measuring forces due to residual stresses
Abstract
The invention discloses a method and a device for measuring stress of a thermal spraying coating, wherein a spraying substrate and the stress measuring device are manufactured, the coating is sprayed on the end face of the spraying substrate, when the specified thickness is reached, a blade is used for peeling the coating from the surface of the substrate to obtain a strip-shaped coating sample, the sample is placed on the measuring device for measurement, the influence degree of residual stress on the coating stress can be directly obtained by visually reading the deformation of the coating sample, the specific residual stress value of the coating does not need to be measured, the type of the coating does not need to be considered, and the influence of the deformation of the coating on the internal stress in the thermal spraying process like a method of sticking a strain gauge does not need to be considered, so that the technical problems of poor intuition and complex measuring process in the prior art are solved.
Description
Technical Field
The invention belongs to the technical field of stress measurement of thermal spraying coatings, and relates to a method and a device for measuring the stress of a thermal spraying coating.
Background
Coating residual stress is one of the remarkable features of thermal spray coatings. The existence of residual stress in the coating affects the microstructure and microhardness of the coating, is easy to cause the generation of microcracks in the coating, reduces the strength of the coating and the bonding strength with a matrix, and directly affects the performances of thermal shock resistance, fatigue life and the like of a workpiece. Various methods for measuring residual stress of coatings are available, such as X-ray diffraction, drilling, curvature, Almen test, and the like. In the actual coating production, the generation of residual stresses and their influence is very complicated.
For thermal spray coatings, the residual stress is closely related to various factors such as spray gas flow, substrate temperature, temperature gradient of a coating/substrate system, coating material performance, powder feeding rate, part geometry, cooling mode, gun path, coating thickness, thermal expansion coefficient, thermal conductivity and the like, and the satisfactory and good-repeatability residual stress of the thermal spray coatings is difficult to obtain by the testing methods. Although some methods can give a certain residual stress value, the influence degree of the stress value on the coating cannot be described qualitatively, the intuitiveness is poor, or the measurement process is complex, and the method cannot be used for field production.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a method and a device for measuring the stress of a thermal spraying coating.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a thermal spray coating stress measurement method comprises the following steps:
s1: manufacturing a spraying substrate and a stress measuring device;
s2: spraying a coating on the end face of the substrate after carrying out primary treatment on the sprayed substrate;
s3: stripping the coating;
s4: and fixing the stripped coating on a stress measuring device, reading the arc height value of the coating on the stress measuring device, and determining the deformation of the coating.
The invention is further improved in that:
in the S1, the spraying substrate is a GH4169 plate, a 2Cr13 plate or a titanium alloy.
The dimensions of the spray substrate are 100mm x 50mm x5 mm.
The S2 includes the steps of:
pasting an adhesive tape on the edge of the end face of the sprayed substrate, blowing sand on the end face of the substrate by using alumina sand stone, wherein when the limit thickness of the coating is tested, the sand blowing parameters are consistent with the parameters of the part to be tested;
in the coating spraying process, the temperature of the sprayed substrate is less than 150 ℃.
In S3, the coating is peeled off from the surface of the sprayed substrate by a blade.
The measuring tool for measuring the arc height of the thermal spraying coating comprises a measuring plate, measuring columns are symmetrically arranged on the measuring plate at intervals, scale marks are marked on the measuring plate, and the scale marks are marked in the middle of the two measuring columns.
The device is further improved in that:
the size of the measuring plate is 100mm multiplied by 100 mm;
the measuring column is a pin shaft, and the diameter of the pin shaft is 6 mm.
The straight line tangent to the upper end surfaces of the two pin shafts is a zero line, and the interval between each scale line is 1 mm.
The distance between the two pin shafts is 60mm, and the distance between the end face, away from the measuring plate, of any one pin shaft and the measuring plate is 10 mm.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a method for measuring stress of a thermal spraying coating, which does not need complex detection equipment, only needs to place a coating sample strip on a stress measuring device after a coating is manufactured in the initial stage, and can directly obtain the influence degree of residual stress on the coating stress according to the deformation degree of the coating sample strip and corresponding data.
The invention discloses a thermal spraying coating stress measuring device which is suitable for measuring various coating types, and the influence of different coating treatment processes on the coating performance is visually reflected through a coating spline arc height measured value.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic view of a substrate for testing coating stress according to the present invention;
FIG. 2 is a diagram of a coating stress measuring device of the present invention;
FIG. 3 is a schematic diagram of the process of measuring the stress of the coating according to the present invention.
Wherein, 1-measuring plate; 2-measuring the column; 3-graduation mark.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually arranged when the product of the present invention is used, the description is merely for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, cannot be understood as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the term "horizontal", if present, does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1-2, the invention discloses a thermal spray coating stress measuring method, wherein a coating is sprayed on the end face (100mm × 5mm surface) of a GH4169 test plate with the specification of 100mm × 50mm × 5mm, the test plate specification is referred to fig. 1, when the specified thickness is reached, a blade is used for stripping the coating from the surface of a substrate to obtain a strip-shaped coating sample, and the deformation degree of the coating sample is measured. When post-treatment of the coating is required, the coating is treated with the test panel and then peeled off to measure the degree of deformation of the coated sample. The specific residual stress value of the coating does not need to be measured, the type of the coating does not need to be considered, the influence of the deformation of the coating on the internal stress in the thermal spraying process by a method like pasting a strain gauge does not need to be considered, and the influence degree of the residual stress on the coating stress can be directly obtained according to the deformation degree of the coating.
The specific operation steps are as follows:
if the limit thickness of the coating on the part needs to be measured, a substrate which is the same as the base material of the part can be adopted;
taking the end face of the coated substrate 100mmx5mm as a test plane, grinding and flattening the test plane by using a grinding machine, removing burrs by using a clamp to maintain a sharp edge as much as possible without chamfering the periphery of the test plane;
step 2, manufacturing an arc height measuring tool: referring to fig. 2, two pin shafts with the diameter of 6mm are fixed on a substrate with the diameter of 100mm × 100mm × 10mm, the center distance of the two pin shafts is 60mm, the pin shafts protrude out of the plane of the substrate by 10mm, a straight line tangent to the upper end directions of the two pin shafts is defined as a primary test line, a scale mark 3 is marked at the middle part of the primary test line by taking the primary test line as a zero-degree line at intervals of 1mm, the scale mark 3 is vertically arranged on a measuring plate 1, a positive number is arranged above the zero line, and a negative number is arranged below the zero line.
Step 4, blowing sand and coarsening: blowing sand by using No. 60-120 alumina sand, wherein different coating types and coating thicknesses have different strippable difficulty degrees, and if necessary, performing plane grinding on a sand blowing surface by using No. 120 sand paper;
the process needs a plurality of tests, preferably, the roughness of the test plane is measured and recorded before spraying, the later adjustment is convenient, the rough friction degree of the test plane needs to ensure the strippability after spraying and also needs to ensure that the coating cannot be stripped too early in the spraying process.
When the test method is used for testing the limit thickness of the coating during the test, the polishing process is not needed after sand blowing.
Step 5, coating spraying: and spraying a coating on the end face (100mm multiplied by 5mm surface) of the substrate according to the determined spraying parameter requirements, wherein the spraying is carried out along the length direction as much as possible.
The spraying process can not be completed once, spraying is carried out for multiple times, the coating state is observed, if the phenomenon that the coating is separated from the test plane is early, spraying is stopped, and spraying is carried out again after the roughness of the test plane is properly increased.
And (3) in the spraying process, cooling is enhanced, the temperature of the substrate is measured, and the highest temperature is controlled to be below 150 ℃ so as to prevent the coating from generating an overheating phenomenon.
Step 6, stripping the coating: the thermal spray protective tape around the test plane was cleaned to expose the coating edge completely and the coating was peeled from the sprayed substrate with a razor blade.
Step 7, measuring the arc height of the coating sample strip: referring to fig. 3, the coating faces the two pins, is placed on the upper end faces of the two pins, the coating is attached to the upper end faces of the pins, the arc height value of the coating sample strip is visually read, the deformation of the coating is determined, the upper part of the reading is positive and represents tensile stress, and the lower part of the reading is negative and represents compressive stress.
Because the strength of the coating sample strip is very low, and the radian of the common sample strip is very large, the measurement of the arc height does not suggest to use mechanical methods such as a dial indicator and the like to carry out visual comparison measurement. During measurement, the movement of two hands is as gentle as possible, and the deformation of the sample strip cannot be caused artificially.
Step 8, coating treatment: when the coating needs to be subjected to subsequent treatment, the residual stress is detected according to the steps 6 to 7 after the coating treatment.
The embodiment of the invention discloses a measuring tool for measuring the arc height of a thermal spraying coating, which comprises a measuring plate 1 and pin shafts, wherein 2 pin shafts are arranged and symmetrically fixed on the measuring plate 1 at intervals, scale marks 3 are engraved between the two pin shafts, and the interval between each scale mark 3 is 1 mm.
Furthermore, the distance between the two pin shafts is 60mm, the diameter of each pin shaft is 6mm, and the distance between the pin shaft and the measuring plate 1 is 10mm from the end face of the measuring plate 1.
Further, the measuring plate 1 in the embodiment of the present invention is rectangular.
The invention does not need complex detection equipment, does not need to measure the specific residual stress value of the coating, does not need to consider the type of the coating, does not need to consider the influence of the deformation of the coating on the internal stress in the thermal spraying process like a method of sticking a strain gauge, and can directly obtain the influence degree of the residual stress on the coating according to the deformation degree of the coating. The method does not even need a special arc height measuring tool, and only needs to be compared and measured on paper surface after being printed according to the ratio of 1: 1. The influence of different coating treatment processes on the coating performance can be intuitively reflected.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A thermal spray coating stress measurement method is characterized by comprising the following steps:
s1: manufacturing a spraying substrate and a stress measuring device;
s2: spraying a coating on the end face of the substrate after carrying out primary treatment on the sprayed substrate;
s3: stripping the coating;
s4: and fixing the stripped coating on a stress measuring device, reading the arc height value of the coating on the stress measuring device, and determining the deformation of the coating.
2. The method of claim 1, wherein in the step S1, the substrate is GH4169 plate, 2Cr13 plate or titanium alloy.
3. The method of claim 2, wherein the dimensions of the thermal spray substrate are 100mm x 50mm x5 mm.
4. The method of stress measurement of a thermal spray coating according to claim 1, wherein said S2 comprises the steps of:
pasting an adhesive tape on the edge of the end face of the sprayed substrate, blowing sand on the end face of the substrate by using alumina sand stone, wherein when the limit thickness of the coating is tested, the sand blowing parameters are consistent with the parameters of the part to be tested;
in the coating spraying process, the temperature of the sprayed substrate is less than 150 ℃.
5. The method of claim 1, wherein in step S3, the blade is used to peel the coating from the surface of the substrate.
6. The stress measuring device for the thermal spray coating is characterized by comprising a measuring plate (1), wherein measuring columns (2) are symmetrically arranged on the measuring plate (1) at intervals, scale marks (3) are marked on the measuring plate (1), and the scale marks (3) are marked in the middle of the two measuring columns (2).
7. A thermal spray coating stress measuring device according to claim 6, characterized in that the dimensions of the measuring plate (1) are 100mm x 100 mm.
8. The thermal spray coating stress measuring device according to claim 7, wherein the measuring column (2) is a pin having a diameter of 6 mm.
9. The thermal spray coating stress measuring device according to claim 8, wherein the line tangent to the upper end surfaces of the two pins is a zero line, and each scale mark (3) is spaced by 1 mm.
10. The thermal spray coating stress measuring device according to claim 9, wherein the two pins are spaced by 60mm, and the distance between the end surface of any pin far away from the measuring plate (1) and the measuring plate (1) is 10 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210410259.8A CN114812901A (en) | 2022-04-19 | 2022-04-19 | Method and device for measuring stress of thermal spraying coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210410259.8A CN114812901A (en) | 2022-04-19 | 2022-04-19 | Method and device for measuring stress of thermal spraying coating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114812901A true CN114812901A (en) | 2022-07-29 |
Family
ID=82505419
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210410259.8A Pending CN114812901A (en) | 2022-04-19 | 2022-04-19 | Method and device for measuring stress of thermal spraying coating |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114812901A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6432134A (en) * | 1987-07-29 | 1989-02-02 | Kawasaki Steel Co | Residual stress measuring method for coating material |
| US20140330525A1 (en) * | 2013-05-03 | 2014-11-06 | The Boeing Company | System and Method for Predicting Distortion of a Workpiece Resulting from a Peening Machine Process |
| CN110966970A (en) * | 2019-12-30 | 2020-04-07 | 山东雷帕得汽车技术股份有限公司 | Steel plate spring arc height measuring tool |
| CN112629725A (en) * | 2020-12-04 | 2021-04-09 | 江苏徐工工程机械研究院有限公司 | Method for testing residual stress of piston rod spraying coating |
| CN112880618A (en) * | 2021-01-15 | 2021-06-01 | 中国民航大学 | Method for measuring curvature radius of APS coating residual stress test piece based on parabolic model |
| CN113640117A (en) * | 2021-08-13 | 2021-11-12 | 中国航发沈阳黎明航空发动机有限责任公司 | Method for testing elastic modulus of coating |
-
2022
- 2022-04-19 CN CN202210410259.8A patent/CN114812901A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6432134A (en) * | 1987-07-29 | 1989-02-02 | Kawasaki Steel Co | Residual stress measuring method for coating material |
| US20140330525A1 (en) * | 2013-05-03 | 2014-11-06 | The Boeing Company | System and Method for Predicting Distortion of a Workpiece Resulting from a Peening Machine Process |
| CN110966970A (en) * | 2019-12-30 | 2020-04-07 | 山东雷帕得汽车技术股份有限公司 | Steel plate spring arc height measuring tool |
| CN112629725A (en) * | 2020-12-04 | 2021-04-09 | 江苏徐工工程机械研究院有限公司 | Method for testing residual stress of piston rod spraying coating |
| CN112880618A (en) * | 2021-01-15 | 2021-06-01 | 中国民航大学 | Method for measuring curvature radius of APS coating residual stress test piece based on parabolic model |
| CN113640117A (en) * | 2021-08-13 | 2021-11-12 | 中国航发沈阳黎明航空发动机有限责任公司 | Method for testing elastic modulus of coating |
Non-Patent Citations (1)
| Title |
|---|
| 伍超群, 周克崧, 邓畅光, 邓春明: "浅谈热喷涂涂层残余应力的测试技术", 表面技术, no. 05, pages 82 - 83 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107036744B (en) | Residual stress blind hole testing method | |
| US20080206485A1 (en) | Devices for evaluating material properties, and related processes | |
| CN103926025B (en) | A kind of test unit for measuring coating unrelieved stress and method | |
| CN103411711A (en) | Measuring device of tubular part inner wall processing stress and measuring method thereof | |
| CN110407156B (en) | Method for preparing thick-film thermocouple on three-dimensional surface based on laser direct writing process | |
| JPS6219701A (en) | Measuring bar | |
| EP3871835A1 (en) | Methods and equipment for surface scratch repair | |
| CN104142280B (en) | A kind of method detecting hard coat quality | |
| CN115290241A (en) | Method for testing residual stress in thin plate | |
| CN114812901A (en) | Method and device for measuring stress of thermal spraying coating | |
| CN113533673A (en) | Metal foil strip internal stress distribution measuring method based on layer-by-layer thinning | |
| CN102962729B (en) | Method for realizing on-line measurement of multi-purpose measuring head for vertical numerically controlled lathe | |
| Schmaljohann et al. | Thin-film sensors with small structure size on flat and curved surfaces | |
| CN114166591B (en) | Mesoscopic scale forming ultimate tensile sample, preparation method and mechanical measurement method | |
| CN105127684B (en) | A kind of spherical sensors spherical shell processing technology for space electric field detection | |
| Jin et al. | Experimental investigation on surface generation mechanism of micro-grinding of hard brittle crystal materials | |
| CN112649363B (en) | Method and device for detecting bonding strength of surfacing material and matrix | |
| CN114184490A (en) | Mesoscale forming limit bending sample, preparation method and mechanical measurement method | |
| US7040032B2 (en) | Method and device for measuring whether a process kit part meets a prescribed tolerance | |
| CN112880618A (en) | Method for measuring curvature radius of APS coating residual stress test piece based on parabolic model | |
| CN109822397B (en) | Mechanism and method for adjusting Raney Shaoxing probe | |
| EP1906161A1 (en) | Devices for evaluating material properties, and related processes | |
| TW201721117A (en) | Residual stress inspection method for brittle material in which an ultrasonic drilling process is applied to drilling a hole in a brittle material and a strain gauge is used to measure a strain thereof | |
| CN108168966B (en) | Device and method for manufacturing molybdenum and molybdenum alloy pipe tensile sample gauge length line | |
| CN111159823A (en) | Rapid measurement and identification method for structural part machining deformation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |