CN110907495A - System and method for detecting thermal conductivity of composite material containing adhesive layer - Google Patents
System and method for detecting thermal conductivity of composite material containing adhesive layer Download PDFInfo
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- CN110907495A CN110907495A CN201911276287.XA CN201911276287A CN110907495A CN 110907495 A CN110907495 A CN 110907495A CN 201911276287 A CN201911276287 A CN 201911276287A CN 110907495 A CN110907495 A CN 110907495A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/18—Investigating or analyzing materials by the use of thermal means by investigating thermal conductivity
Abstract
The invention belongs to the technical field of heat conduction performance measurement, and particularly relates to a system and a method for detecting the heat conduction performance of a composite material containing an adhesive layer. The system comprises an insulating layer, a heat source, a first metal material, a second metal material, a temperature sensor and a processor. According to the invention, by applying a heat source, the generated heat is conducted through any metal material, the composite material to be tested containing the adhesive layer and another metal material in sequence, and the heat conductivity coefficient of the composite material containing the adhesive layer can be calculated according to the linear conduction characteristics of the heat in the first metal material and the second metal material and a classical thermal theory. The heat conductivity coefficient of the composite material containing the sticking layer obtained by calculation is the heat conductivity coefficient combining the sticking condition of the composite material. And the heat preservation layer is arranged at the periphery of the heat source, the first metal material, the composite material containing the sticking layer and the second metal material to prevent heat loss, so that the measurement of the heat conductivity coefficient is more accurate.
Description
Technical Field
The invention belongs to the technical field of heat conduction performance measurement, and particularly relates to a system and a method for detecting the heat conduction performance of a composite material containing an adhesive layer.
Background
The space mechanical movable part is composed of two friction pairs which move mutually, and plays a role in transferring movement and supporting load, such as the friction pairs of movable parts such as a bearing, a gear transmission pair, a ball screw and the like, and material pairs of some space compression release mechanisms and the like. Most friction pairs are made of metal materials, and because the working environment of a space mechanical movable part is vacuum, the cold welding phenomenon is easy to generate, so that the movable part is blocked and even fails in movement. Therefore, the surface of the kinematic friction pair is often modified, or a cold welding prevention treatment is often performed by adhering a composite material or the like.
For the composite material adhered on the metal surface, the heat conducting performance of the adhered composite material is difficult to measure due to the adhering process, the adhesive material and the contact thermal resistance formed by incomplete contact with the metal substrate. On a microscopic level, due to the rugged contact surface, the real contact area of the thin-layer material, especially the woven composite material, after being pasted is far smaller than the nominal contact area, and other media such as air fluid and the like can be filled between the peaks of the contact after being pasted. Therefore, if the thermal conductivity of the adhered composite material is measured by the thermal conductivity measuring instrument, the measurement result has a large error due to the thermal resistance generated by the contact between the sample and the upper and lower surfaces of the measuring instrument and the thermal resistance formed by the adhesive layer.
Disclosure of Invention
The invention provides a system and a method for detecting the heat conductivity of a composite material containing an adhesive layer, which are used for solving the problem that the measurement of the heat conductivity of the composite material containing the adhesive layer by a heat conductivity measuring instrument is inaccurate.
In order to solve the technical problem, the technical scheme of the invention comprises the following steps:
the invention discloses a detection system for detecting the heat conductivity of a composite material containing an adhesive layer, which comprises a heat insulation layer, a heat source, a first metal material, a second metal material, a temperature sensor and a processor, wherein the heat insulation layer is made of a metal material; the composite material to be tested containing the sticking layer comprises two contact surfaces, namely a first contact surface and a second contact surface, wherein the first contact surface is in contact with the first metal material, and the second contact surface is a sticking surface and is stuck with the second metal material; the heat source is arranged at one end of any metal material far away from the composite material; the temperature sensor is used for detecting the temperature of each temperature measuring point arranged on a first metal material and a second metal material, at least two temperature measuring points which are not at the same height are arranged on the first metal material, and at least two temperature measuring points which are not at the same height are arranged on the second metal material; wherein, the height is the shortest distance between the temperature measuring point and the heat source; the heat insulation layer is arranged at the peripheries of the heat source, the first metal material, the composite material containing the adhesive layer and the second metal material and is used for ensuring that heat generated by the heat source is conducted along the direction of any one metal material, the composite material containing the adhesive layer and the other metal material; the processor is connected with the temperature sensor in a sampling mode and used for calculating the heat conductivity coefficient of the composite material containing the adhesive layer according to the temperature of each temperature measuring point detected by the temperature sensor and the position of each temperature measuring point.
The invention discloses a method for detecting the heat conduction performance of a composite material containing an adhesive layer, which comprises the following steps: arranging a first metal material in a contact manner on a first contact surface of a composite material to be detected containing a paste layer, arranging a second metal material on a second contact surface in a pasting manner, wherein the second contact surface is provided with the paste layer; applying a heat source on any metal material to conduct heat generated by the heat source along the direction of any metal material, the composite material containing the adhesive layer and the other metal material; arranging at least two temperature measuring points which are not at the same height on the first metal material, and determining the temperature of the first contact surface according to the positions of the temperature measuring points and the position of the first contact surface; arranging at least two temperature measuring points which are not at the same height on the second metal material, and determining the temperature of the second contact surface according to the positions of the temperature measuring points and the position of the second contact surface; wherein, the height is the shortest distance between the temperature measuring point and the heat source; calculating the thermal conductivity coefficient of the composite material containing the adhesive layer according to the temperature of the first contact surface, the temperature of the second contact surface and the thickness of the composite material containing the adhesive layer and by combining the heat flux density of the composite material; wherein the thickness of the composite material comprising the adhesive layer is the distance between the first contact surface and the second contact surface, and the heat flow density is determined by the heat source.
The beneficial effects of the above technical scheme are: according to the invention, by applying a heat source, the generated heat is conducted through any metal material, the composite material to be detected containing the adhesive layer and another metal material in sequence, and according to the linear conduction characteristics of the heat in the first metal material and the second metal material, the temperature of the first contact surface and the temperature of the second contact surface of the composite material containing the adhesive layer can be calculated according to the temperature detected by the temperature sensor, and then the heat conductivity coefficient of the composite material containing the adhesive layer is calculated according to the classical theory of heat. The invention does not use the existing heat conductivity measuring instrument to measure the heat conductivity coefficient of the composite material containing the adhesive layer, but combines the actual adhesion condition of the composite material, and further can calculate the heat conductivity coefficient of the composite material containing the adhesive layer combined with the adhesion condition of the composite material by combining the heat conductivity coefficient and the temperature of two contact surfaces of the composite material, thereby being a direct and reliable detection system. And the heat preservation layer is arranged at the periphery of the heat source, the first metal material, the composite material containing the sticking layer and the second metal material to prevent heat loss, so that the measurement of the heat conductivity coefficient is more accurate.
As a further improvement of the system, the heat-insulating layer is a heat-insulating shell comprising an opening, the heat source, the first metal material, the composite material comprising the adhesive layer and the second metal material are all arranged in the heat-insulating shell, and the heat source is arranged at a position far away from the opening.
As a further improvement of the system, the temperature measuring points are located on a straight line.
As a further improvement of the system, in order to conveniently detect the temperature of each temperature measuring point, the temperature sensor is a thermocouple.
As a further improvement of the system, the second metal material is the same as or different from the first metal material.
As a further improvement of the system, in order to prevent the heat generated by the heat source from dissipating, the heat-insulating layer is made of asbestos materials or silicon rubber materials.
As a further improvement of the method, in order to simplify the calculation, when there are two temperature measuring points on the first metal material, the temperature of the first contact surface is:
in the formula, t4Is the temperature of the first contact surface, t1、t3Respectively the temperatures of two temperature measuring points on the first metal material, d14Is t1The distance between the corresponding temperature measuring point and the first contact surface, d13The distance between two temperature measuring points on the first metal material along the heat conduction direction;
when two temperature measuring points are arranged on the second metal material, the temperature of the second contact surface is as follows:
in the formula, t5Is the temperature of the second contact surface, t6、t8Respectively the temperatures of two temperature measuring points on the second metal material, d56Is t6The distance between the corresponding temperature measuring point and the second contact surface, d68Is the distance between two temperature measuring points on the second metal material along the heat conduction direction.
As a further improvement of the method, the thermal conductivity of the composite material comprising the adhesive layer is:
where λ is the thermal conductivity of the composite material comprising the adhesive layer, q is the heat flow density through the composite material, and d is0Thickness of the composite material comprising the adhesive layer, t4Is the temperature of the first contact surface, t5Is the temperature of the second contact surface.
In a further improvement of the method, an insulating layer is arranged on the periphery of any one of the metal materials, the composite material containing the adhesive layer and the other metal material, so that heat generated by a heat source is conducted along the direction of any one of the metal materials, the composite material containing the adhesive layer and the other metal material.
Drawings
FIG. 1 is a cross-sectional view of a detection system for detecting thermal conductivity of a composite material including an adhesive layer in accordance with the present invention;
FIG. 2 is a graph of temperature measurements of a first batch of samples according to the present invention;
FIG. 3 is a graph of temperature measurements taken on a second sample of the present invention;
wherein, 1-heat preservation layer, 2-heat source, 3-first metal material, 4-composite material containing adhesive layer, and 5-second metal material.
Detailed Description
The embodiment of the system is as follows:
this embodiment provides a detection system for detecting the thermal conductivity of a composite material comprising an adhesive layer. The actual friction pair comprises two metal materials, wherein one metal material is adhered to the composite material through an adhesion layer to perform cold welding prevention treatment. As shown in fig. 1, the system comprises an insulating outer layer 1, a heat source 2, a first metallic material 3, a second metallic material 5, a temperature sensor and a processor (the temperature sensor and the processor are not shown in fig. 1).
In fig. 1, the insulating layer 1 is an insulating shell with a downward opening, the insulating outer layer 1 is directly sleeved outside the internal sample material to ensure the longitudinal conduction of internal heat, and the composite material 4 containing the adhesive layer to be detected can be placed in the insulating layer 1 through the opening during detection. The heat-insulating layer can be directly wrapped by asbestos with the thickness of more than 15mm for heat insulation treatment, or a silicon rubber heating plate (nickel-chromium alloy heating wire is sandwiched between silicon rubber high-temperature insulating cloth) is adopted, so that the heat-conducting property measurement under the constant temperature condition within the range of 16-200 ℃ at room temperature can be realized.
As shown in fig. 1, a heat source 2, a first metal material 3, a composite material 4 including an adhesive layer, and a second metal material 5 are sequentially disposed in a direction perpendicular to a plane of an opening in an insulating layer 1. The composite material 4 including the adhesive layer has two contact surfaces, namely a first contact surface (an upper contact surface of the composite material 4 including the adhesive layer in fig. 1) and a second contact surface (a lower contact surface of the composite material 4 including the adhesive layer in fig. 1, which is an adhesive surface), the first contact surface is in contact with the heat source 2, and the second contact surface is adhered to the second metal material 5 through the adhesive layer. During detection, the composite material 4 containing the paste layer to be detected is placed between the first metal material 3 and the second metal material 5, the paste surface and the second metal material 5 are pasted together, the cross section of the composite material is shown in fig. 1, and heat generated by the heat source 2 is conducted through the first metal material 3, the composite material 4 containing the paste layer, the second metal material 5 and the opening in sequence. It should be noted that, in actual use, the composite material is adhered to one of the metal materials of the friction pair, so that when the thermal conductivity of the composite material including the adhesion layer is detected, the composite material adhered to the metal material can be directly taken for measurement, and at this time, the second metal material does not need to be arranged in the system, and the adhered metal material is directly used as the second metal material in the system.
The heat source 2 is used for generating heat, naturally contacts with the insulating layer on the upper portion of the heat source and the first metal material 3 on the lower portion of the heat source or applies certain contact pressure, and materials and parameters of the heat source can be selected as shown in table 1. The first metal material 3 is naturally in contact with the composite material or exerts a certain contact pressure. The composite material 4 including the adhesive layer is adhered to the upper surface of the second metal material 5. The first metal material 3 and the second metal material 5 may be the same metal or different metals.
TABLE 1
| Insulating material | Polyimide, polyimide resin composition and polyimide resin composition |
| Thickness of electrothermal film | 0.08mm～0.12mm |
| Maximum temperature of use | Long term 180 deg.C (300 deg.C in short time) |
| Minimum temperature resistance | -195℃ |
| Highest heat flux density | 7.8W/cm2 |
| Power density selection | According to the actual use condition |
The temperature sensor may be a contact thermocouple. In the figure 1, a plurality of temperature measuring points are arranged, three temperature measuring points are arranged on the first metal material 3, namely a temperature measuring point 1, a temperature measuring point 2 and a temperature measuring point 3, and the corresponding detected temperatures are t1、t2、t3Three temperature measuring points, namely a temperature measuring point 6, a temperature measuring point 7 and a temperature measuring point 8 are arranged on the second metal material 5, and the corresponding detected temperatures are t6、t7、t8. In this embodiment, the six temperature measurement points are on a straight line, and the straight linePerpendicular to the plane of the heat source.
The processor is a universal processor, the processor is connected with the temperature sensor through a hard line to obtain the temperature detected by the temperature sensor, and then the heat conductivity coefficient of the composite material containing the adhesive layer to be detected can be calculated by utilizing the temperature of each temperature measuring point, the position of each temperature measuring point and other data, so that the heat conductivity of the composite material containing the adhesive layer is judged, and the method for detecting the heat conductivity of the composite material containing the adhesive layer is realized.
The principle of the method is as follows: the heat source 2 generates heat, and as the circumferential direction and the top are both made of heat insulation materials, most of the heat is conducted downwards along the longitudinal direction, the better the circumferential heat insulation performance is, and the more the heat is conducted downwards along the longitudinal direction, the closer to linearity is. The temperature t of the upper and lower contact surfaces of the composite material including the adhesive layer can be obtained based on the linear heat transfer characteristics of the first and second metal materials 3 and 54、t5And then the heat conductivity coefficient of the composite material containing the adhesive layer can be obtained according to a classical heat transfer formula. The method is described in detail below.
First, the composite material 4 including the adhesive layer is placed between the first metal material and the second metal material, and the first metal material 3 is naturally contacted with the composite material or a certain contact pressure is applied, so that the composite material is adhered to the second metal material 5 through the adhesive layer. In order to calculate the thermal conductivity of the composite material including the adhesive layer, the distance d between the temperature measuring points 1 and 3 in the heat conduction direction needs to be measured first13Distance d between temperature measuring point 1 and upper contact surface14Distance d between temperature measuring point 6 and temperature measuring point 8 in the direction of heat transfer68Distance d between temperature measuring point 6 and lower contact surface56And thickness d of the composite material comprising the adhesive layer0(i.e., the distance between the first contact surface and the second contact surface in fig. 1). It should be noted that, since the temperature measuring points are on a straight line in this embodiment and the straight line is perpendicular to the plane of the heat source, the distance between the temperature measuring points is directly measured as the distance along the heat conduction direction, for example, if the temperature measuring points are not on a straight lineOr in a straight line but not perpendicular to the plane of the heat source, the distance measured should be the vertical distance in fig. 1, i.e. the distance between the temperature measurement points in the direction of heat conduction.
And then, statically loading 20Mpa, heating by a heat source at a certain heat flow density, and detecting each temperature measuring point by a contact thermocouple after the temperature of the whole friction pair tends to be stable. In order to ensure the detection accuracy, the detection of each contact point is carried out three times and an average value is obtained, and the temperature difference is required to be measured before and after not to exceed 3 ℃. For simple processing, instead of all six temperature measuring points, only four of the six temperature measuring points are used, namely temperature measuring point 1, temperature measuring point 3, temperature measuring point 6 and temperature measuring point 8, and the detected temperatures are t1、t3、t6、t8。
Then, the temperature t of the upper contact surface of the composite material containing the adhesive layer is calculated by using the principle that the heat conduction is close to linear by using the formula 14Calculating the temperature t of the lower contact surface of the composite material containing the adhesive layer by using the formula 25。
And finally, determining the heat flux density q passing through the composite material according to a heat source, and calculating the heat conductivity coefficient of the composite material containing the adhesive layer according to a formula (3).
It should be noted that the heat flux density is generated by a heat source, the heat flux density passing through the material is related to the material of the material, and the lower the heat conductivity of the material is, the lower the heat flux density passing through the corresponding material is. In this embodiment, the heat flow density through the composite material is approximately the heat flow density through the first metallic material, which is entirely generated by the heat source, so the heat flow density through the composite material is determined by the heat source.
Moreover, the formula of how to calculate the temperature of the upper contact surface by using the temperature of the temperature measuring points, the distance between the temperature measuring points along the heat conduction direction, and the distance between the temperature measuring points and the upper contact surface of the composite material including the adhesive layer is not limited to the formula (1), and the formula can be flexibly calculated by using the principle that the conduction is close to linear, for example, the formula shown in the formula (4) can be adopted. The principle of calculating the temperature of the lower contact surface of the composite material comprising the adhesive layer is the same. Of course, t can also be calculated by solving the equation (2)4And t calculated by equation (4)4The average value of (3) is defined as the temperature of the upper contact surface.
In the formula (d)34Is the distance between the temperature measuring point 1 and the upper contact surface.
The arrangement and structure of the heat-insulating layer are not limited to those shown in fig. 1, as long as the heat generated by the heat source can be conducted along the direction of the first metal material, the composite material including the adhesive layer, and the second metal material.
The above-described structure was applied to practical tests as follows. In the test, the composite material is a woven material, so that the thermal conductivity of the woven material containing the adhesive layer is measured and researched, and the thermal conductivity of the adhered woven material is the thermal conductivity of the material after actual abrasion.
As shown in FIG. 1, the heat source and the sample were heat-insulated in the circumferential direction with asbestos 150mm thick, and heat was transferred along the contact surface in the normal direction. In the test process, firstly, static loading is carried out at 20MPa, the auxiliary pair is heated by a heat source at a certain heat flow density, after the temperature of the whole friction pair tends to be stable, each temperature measuring point is measured by a contact type thermocouple, each point is measured for three times, the average value is taken, and the temperature difference measured before and after the same point is not more than 3 ℃. The test respectively measures the heat flow density of 4W/cm2And 5.5W/cm2Under the condition ofHeat transfer conditions of (1).
TABLE 1 first batch of sample measurements
TABLE 2 second batch of sample measurements
Tables 1 and 2 show the comparison of the thermal conductivity of two batches of woven materials with 20% PTFE content calculated from the test results with the results measured by the existing thermal conductivity measuring instrument, wherein the first batch of samples measured ambient temperature 25.5 ℃, humidity 64%, stabilized asbestos surface temperature 33.1 ℃, the second batch of samples measured ambient temperature 26.2 ℃, humidity 64%, stabilized asbestos surface temperature 40.5 ℃, and the measurement results are shown in fig. 2 and 3. FIG. 2 shows the temperature values measured for the first batch of samples, and it can be seen that the temperature values at different points inside the friction pair are not in a linear relationship, especially 5.5W/cm2The nonlinear relation of three-point temperature measured under the condition is obvious. In contrast, the linear relationship of the measured temperature at low heat flux density within the same material is accurate.
The method comprises the following steps:
this embodiment provides a method of detecting the thermal conductivity of a composite material comprising an adhesive layer, the method comprising the steps of:
arranging a first metal material in a contact manner on a first contact surface of a composite material to be detected containing a paste layer, arranging a second metal material on a second contact surface in a pasting manner, wherein the second contact surface is provided with the paste layer; applying a heat source on any metal material to conduct heat generated by the heat source along the direction of any metal material, the composite material containing the adhesive layer and the other metal material;
arranging at least two temperature measuring points which are not at the same height on the first metal material, and determining the temperature of the first contact surface according to the positions of the temperature measuring points and the position of the first contact surface; arranging at least two temperature measuring points which are not at the same height on the second metal material, and determining the temperature of the second contact surface according to the positions of the temperature measuring points and the position of the second contact surface; wherein, the height is the shortest distance between the temperature measuring point and the heat source;
calculating the thermal conductivity coefficient of the composite material containing the adhesive layer according to the temperature of the first contact surface, the temperature of the second contact surface and the thickness of the composite material containing the adhesive layer and by combining the heat flux density of the composite material; wherein the thickness of the composite material comprising the adhesive layer is the distance between the first contact surface and the second contact surface, and the heat flow density is determined by the heat source.
The method can be implemented by using the detection system in the system embodiment, and how to implement the method for detecting the thermal conductivity of the composite material including the adhesive layer by using the detection system in the system embodiment is described in detail, and is not described again here.
Claims (10)
1. A detection system for detecting the heat conductivity of a composite material containing an adhesive layer is characterized by comprising a heat insulation layer, a heat source, a first metal material, a second metal material, a temperature sensor and a processor;
the composite material to be tested containing the sticking layer comprises two contact surfaces, namely a first contact surface and a second contact surface, wherein the first contact surface is in contact with the first metal material, and the second contact surface is a sticking surface and is stuck with the second metal material;
the heat source is arranged at one end of any metal material far away from the composite material;
the temperature sensor is used for detecting the temperature of each temperature measuring point arranged on a first metal material and a second metal material, at least two temperature measuring points which are not at the same height are arranged on the first metal material, and at least two temperature measuring points which are not at the same height are arranged on the second metal material; wherein, the height is the shortest distance between the temperature measuring point and the heat source;
the heat insulation layer is arranged at the peripheries of the heat source, the first metal material, the composite material containing the adhesive layer and the second metal material and is used for ensuring that heat generated by the heat source is conducted along the direction of any one metal material, the composite material containing the adhesive layer and the other metal material;
the processor is connected with the temperature sensor in a sampling mode and used for calculating the heat conductivity coefficient of the composite material containing the adhesive layer according to the temperature of each temperature measuring point detected by the temperature sensor and the position of each temperature measuring point.
2. The system of claim 1, wherein the thermal insulation layer is an insulation shell having an opening, the heat source, the first metal material, the composite material including the adhesive layer, and the second metal material are disposed in the insulation shell, and the heat source is disposed at a position away from the opening.
3. A test system for testing the thermal conductivity of a composite material comprising an adhesive layer according to claim 1 wherein the temperature measurement points are located on a straight line.
4. A test system for testing the thermal conductivity of a composite material containing an adhesive layer as set forth in claim 1 wherein said temperature sensor is a thermocouple.
5. The system of claim 1, wherein the second metal material is the same or different material than the first metal material.
6. The detection system for detecting the thermal conductivity of the composite material comprising the adhesive layer according to any one of claims 1 to 5, wherein the heat insulation layer is made of asbestos material or silicone rubber material.
7. A method of testing the thermal conductivity of a composite material comprising an adhesive layer, comprising the steps of:
arranging a first metal material in a contact manner on a first contact surface of a composite material to be detected containing a paste layer, arranging a second metal material on a second contact surface in a pasting manner, wherein the second contact surface is provided with the paste layer; applying a heat source on any metal material to conduct heat generated by the heat source along the direction of any metal material, the composite material containing the adhesive layer and the other metal material;
arranging at least two temperature measuring points which are not at the same height on the first metal material, and determining the temperature of the first contact surface according to the positions of the temperature measuring points and the position of the first contact surface; arranging at least two temperature measuring points which are not at the same height on the second metal material, and determining the temperature of the second contact surface according to the positions of the temperature measuring points and the position of the second contact surface; wherein, the height is the shortest distance between the temperature measuring point and the heat source;
calculating the thermal conductivity coefficient of the composite material containing the adhesive layer according to the temperature of the first contact surface, the temperature of the second contact surface and the thickness of the composite material containing the adhesive layer and by combining the heat flux density of the composite material; wherein the thickness of the composite material comprising the adhesive layer is the distance between the first contact surface and the second contact surface, and the heat flow density is determined by the heat source.
8. The method of claim 7, wherein when the first metallic material has two temperature measurement points, the temperature of the first contact surface is:
in the formula, t4Is the temperature of the first contact surface, t1、t3Respectively the temperatures of two temperature measuring points on the first metal material, d14Is t1The distance between the corresponding temperature measuring point and the first contact surface, d13The distance between two temperature measuring points on the first metal material along the heat conduction direction;
when two temperature measuring points are arranged on the second metal material, the temperature of the second contact surface is as follows:
in the formula, t5Is the temperature of the second contact surface, t6、t8Respectively the temperatures of two temperature measuring points on the second metal material, d56Is t6The distance between the corresponding temperature measuring point and the second contact surface, d68Is the distance between two temperature measuring points on the second metal material along the heat conduction direction.
9. The method of claim 7, wherein the composite material comprising the adhesive layer has a thermal conductivity of:
where λ is the thermal conductivity of the composite material comprising the adhesive layer, q is the heat flow density through the composite material, and d is0Thickness of the composite material comprising the adhesive layer, t4Is the temperature of the first contact surface, t5Is the temperature of the second contact surface.
10. The method for detecting the thermal conductivity of the composite material comprising the adhesive layer according to any one of claims 7 to 9, wherein a heat insulating layer is provided on the periphery of the metal material, the composite material comprising the adhesive layer, or the other metal material so that the heat generated by the heat source is conducted in the direction of the metal material, the composite material comprising the adhesive layer, or the other metal material.
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