Method for testing sintering performance of copper pipe for heat pipe

Abstract

The invention relates to the technical field of material performance testing, and discloses a sintering performance testing method of a copper pipe for a heat pipe, which comprises the following steps: sample pipe manufacturing: cutting a copper pipe of 35-45mm as a sample pipe; the sample tube is placed in a furnace cavity of a heating furnace, the vacuum degree of the furnace cavity is pumped to be below 10 <-2 > Pa, then the temperature in the furnace cavity is increased to the simulated sintering temperature T, T is larger than or equal to 940 DEG C and smaller than or equal to 980 DEG C, the simulated sintering time is t, t is larger than or equal to 100 min and smaller than or equal to 130 min, and the temperature increasing time is 60 min; flattening the sample tube: naturally cooling the sample tube to room temperature along with the heating furnace, taking out the sample tube from the furnace chamber, and flattening the sample tube; and observing the sample pipe: observing the surface of the flattened sample pipe, and if the surface of the sample pipe is sunken and the area of the sunken part is greater than or equal to 2 mm < 2 >, determining that the copper pipe is unqualified. According to the test method, whether the copper pipe is qualified can be known in advance, and the hysteresis influence of detection is avoided. The method for testing the sintering performance of the copper pipe for the heat pipe has the advantages of few steps, simple operation method and short required period.

Description

Technical Field

[0001] The invention relates to the technical field of material performance testing, and in particular to a sintering performance testing method for a copper tube used for a heat pipe. Background Art

[0002] With the advent of the 5G era, the amount of data transmission in high-power electronic devices, base stations, servers, etc. has doubled. The internal electronic components generate serious heat when working. The heat dissipation problem of the equipment seriously affects the service life of the components and also determines whether they can be used in the field of high-end products. In recent years, oxygen-free copper heat pipes have begun to be used in the field of heat dissipation of high-power electronic equipment due to their efficient thermal conductivity.

[0003] Heat pipes need to be sintered at high temperatures during the production process. After sintering, the grains grow and the plasticity of the copper pipe decreases, which causes defects such as dents and cracks to appear during the post-manufacturing process (flattening, bending, and shaping, etc.), resulting in unqualified heat pipes. However, there is currently no effective detection method in the copper pipe production process. The only way is to send samples to customers for testing. That is, the customer uses the copper pipe for actual production. After the heat pipe shrinkage, powder filling, and sintering processes, the sintering performance of the copper pipe is quickly verified to verify the feasibility of the copper pipe production process for heat pipes. This is costly, has a long detection cycle, and has very serious detection lags. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a sintering performance test method for a copper tube for a heat pipe, which is used to verify the sintering performance during the production stage of the copper tube. The method is simple, has few steps and a short cycle.

[0005] According to an embodiment of the present invention, a sintering performance test method for a copper tube for a heat pipe comprises the following steps: sample tube preparation: cutting a 35 mm to 45 mm copper tube as a sample tube; simulating sintering of the sample tube: placing the sample tube in a furnace chamber of a heating furnace, first drawing the vacuum degree of the furnace chamber to 10 -2 Pa, then the temperature in the furnace chamber is raised to the simulated sintering temperature T, 940℃≤T≤980℃, the simulated sintering time is t, 100min≤t≤130min, and the heating time is 60min; Flattening the sample tube: the sample tube is naturally cooled to room temperature along with the furnace chamber, and the sample tube is taken out of the furnace chamber and flattened; Observe the sample tube: observe the surface of the flattened sample tube, if the surface of the sample tube is smooth and flat, the copper tube is qualified, if the surface of the sample tube is concave, and the area of ​​the concave is ≥2mm 2 , then the copper tube is unqualified.

[0006] At least the following beneficial effects are achieved:

[0007] When producing copper tubes, before processing the copper tubes into the required heat pipe products, sample tubes are cut for simulated sintering tests. The sample tubes are heated to a certain temperature and kept warm for a certain period of time, and then flattened. By observing whether there are obvious depressions on the surface of the flattened sample tubes, it is indirectly reflected whether the sintering performance of the heat pipe is qualified. This is a method of detecting the sintering performance of the heat pipe in advance, instead of testing the qualified status of the heat pipe products after the subsequent processing and production of the heat pipe products. It is known in advance whether the copper tubes are qualified, and unqualified copper tubes are eliminated. The qualified copper tubes are processed into heat pipe products, which can reduce the waste of resources and manpower, reduce production costs, and avoid the hysteresis effect of detection. In addition, the sintering performance test method of copper tubes for heat pipes has fewer steps, simple operation methods, and a short required cycle.

[0008] According to some embodiments of the present invention, the heating furnace is a tubular furnace, the quartz tube of the tubular furnace forms the furnace chamber, the quartz tube is connected to a mechanical pump and a molecular pump, the mechanical pump and the molecular pump are both used to evacuate the quartz tube, and in the sample tube flattening step, a flattening machine is used to flatten the sample tube.

[0009] According to some embodiments of the present invention, in the sample tube production step, the sample tube obtained by cutting has no obvious bends, and the inner and outer surfaces of the sample tube are smooth, without bump defects, lubricating oil and cleaning agent.

[0010] According to some embodiments of the present invention, in the simulated sintering sample tube step, the wall thickness of the sample tube is s, and the relationship between the wall thickness s of the sample tube, the simulated sintering temperature T and the simulated sintering time t is as follows:

[0011] When 0.05mm≤s≤0.1mm, T=950℃, t=100min;

[0012] When 0.1mm<s≤0.2mm, T=980℃, t=120min;

[0013] When 0.3mm<s≤0.5mm, T=975℃, t=130min;

[0014] When s>0.5mm, T=950℃, t=130min.

[0015] According to some embodiments of the present invention, in the step of flattening the sample tube, the relationship between the outer diameter D of the sample tube and the thickness h of the sample tube after flattening is D=2h.

[0016] According to some embodiments of the present invention, in the step of flattening the sample tube, the relationship between the outer diameter D of the sample tube and the thickness h of the sample tube after flattening is as follows:

[0017] When D = 5 mm, h = 2 mm;

[0018] When D = 6 mm, h = 3 mm;

[0019] When D = 8 mm, h = 4 mm;

[0020] When D = 10 mm, h = 5 mm;

[0021] When D=12mm, h=6mm.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0024] Figure 1 Schematic diagram of a flow chart of an embodiment of the present invention. DETAILED DESCRIPTION

[0025] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0026] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] In the description of the present invention, "a plurality" means more than two. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0028] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0029] Reference Figure 1 The present invention discloses a sintering performance test method for a copper tube for a heat pipe, comprising the following steps: sample tube preparation: cutting a copper tube of 35 mm to 45 mm as a sample tube; simulating sintering of the sample tube: placing the sample tube in a furnace chamber of a heating furnace, first drawing the vacuum degree of the furnace chamber to 10 -2Pa, then raise the temperature in the furnace chamber to the simulated sintering temperature T, 940℃≤T≤980℃, simulated sintering time t, 100min≤t≤130min, heating time 60min; flatten the sample tube: the sample tube is naturally cooled to room temperature with the furnace chamber, the sample tube is taken out of the furnace chamber and flattened; observe the sample tube: observe the surface of the flattened sample tube, if the surface of the sample tube is smooth and flat, the copper tube is qualified, if the surface of the sample tube is concave, and the area of ​​the concave is ≥2mm 2 , the copper tube is unqualified.

[0030] When producing copper tubes, before processing the copper tubes into the required heat pipe products, sample tubes are cut for simulated sintering tests. The sample tubes are heated to a certain temperature and kept warm for a certain period of time, and then flattened. By observing whether there are obvious depressions on the surface of the flattened sample tubes, it is indirectly reflected whether the sintering performance of the heat pipe is qualified. This is a method of detecting the sintering performance of the heat pipe in advance, instead of testing the qualified status of the heat pipe products after the subsequent processing and production of the heat pipe products. It is known in advance whether the copper tubes are qualified, and unqualified copper tubes are eliminated. The qualified copper tubes are processed into heat pipe products, which can reduce the waste of resources and manpower, reduce production costs, and avoid the hysteresis effect of detection. In addition, the sintering performance test method of copper tubes for heat pipes has fewer steps, simple operation methods, and a short required cycle.

[0031] In some embodiments, the heating furnace is a tubular furnace, the quartz tube of the tubular furnace forms a furnace chamber, the quartz tube is connected to a mechanical pump and a molecular pump, the mechanical pump and the molecular pump are used to evacuate the quartz tube, the mechanical pump and the molecular pump evacuate the quartz tube in turn, and ensure that the vacuum degree of the furnace chamber can be evacuated to 10 -2 Below Pa.

[0032] It can be known that the rated power of the tube furnace is 5KW, the rated temperature is 1100℃, the maximum temperature is 1200℃, and the temperature control accuracy is ±1℃. Of course, the heating furnace can also use other types of heating equipment to meet the requirements of vacuum degree, heating temperature and insulation time.

[0033] In some of the embodiments, in the sample tube production step, the sample tube obtained by cutting has no obvious bend, and the inner and outer surfaces of the sample tube are smooth, without bump defects, lubricating oil and cleaning agent. The inner and outer surfaces of the sample tube are smooth and without bump defects, so as to avoid the initial state of the sample tube affecting the observation results. Lubricating oil and cleaning agent are volatile, and there is no lubricating oil and cleaning agent on the inner and outer surfaces of the sample tube, so as to avoid the volatile lubricating oil and cleaning agent affecting the operation of the heating furnace.

[0034] In some of the embodiments, in the step of simulating the sintering of the sample tube, the wall thickness of the sample tube is s, and the relationship between the wall thickness s of the sample tube, the simulated sintering temperature T and the simulated sintering time t is as follows:

[0035] When 0.05mm≤s≤0.1mm, T=950℃, t=100min;

[0036] When 0.1mm<s≤0.2mm, T=980℃, t=120min;

[0037] When 0.3mm<s≤0.5mm, T=975℃, t=130min;

[0038] When s>0.5mm, T=950℃, t=130min.

[0039] The relationship between the wall thickness s of the sample tube, the simulated sintering temperature T and the simulated sintering time t is made into a table as follows:

[0040] Wall thickness of sample tube s / mm Simulated sintering temperature T / ℃ Simulated sintering time t / min 0.05≤s≤0.1 950 100 0.1＜s≤0.2 980 120 0.3＜s≤0.5 975 130 s＞0.5 950 t＝130

[0041] Of course, the simulated sintering temperature T may have an error of ±30°C.

[0042] In some of the embodiments, in the step of flattening the sample tube, the relationship between the outer diameter D of the sample tube and the thickness h of the flattened sample tube is D=2h.

[0043] In some embodiments, in the step of flattening the sample tube, the relationship between the outer diameter D of the sample tube and the thickness h of the flattened sample tube is as follows:

[0044] When D = 5 mm, h = 2 mm;

[0045] When D = 6 mm, h = 3 mm;

[0046] When D = 8 mm, h = 4 mm;

[0047] When D = 10 mm, h = 5 mm;

[0048] When D=12mm, h=6mm.

[0049] The relationship between the outer diameter D of the sample tube and the thickness h of the flattened sample tube is made into a table as follows:

[0050] Outer diameter D / mm Thickness h / mm 5 2 6 3 8 4 10 5 12 6

[0051] In the step of flattening the sample tube, a flattening machine is used to flatten the sample tube. The lower pressing plate of the flattening machine is used to place the sample tube, and the upper pressing plate is raised and lowered to knock the sample tube. Each time the sample tube is knocked, the thickness h of the sample tube can be detected once to avoid excessive knocking of the sample tube, thereby preventing the thickness of the sample tube from being too small.

[0052] In some embodiments, in the sample tube observation step, an area measuring instrument is used to measure the area of ​​the depression. The area measuring instrument is in the shape of a plate and is made of a transparent material. The area measuring instrument is provided with a plurality of 2 mm 2When measuring the area of ​​a depression, the area measuring instrument selects a pattern that is closest to the depression with the largest area on the sample tube and covers the depression with the pattern. If the pattern is larger than the depression, that is, the pattern can cover the depression, then the area of ​​the depression is less than 2mm. 2 If the pattern is smaller than the depression, that is, the pattern cannot cover the depression, then the area of ​​the depression is greater than 2mm. 2 , then the sample tube is unqualified.

[0053] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] Of course, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the present invention, and these equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A method for testing the sintering performance of a copper tube for a heat pipe, characterized in that: The following steps are included: Sample tube production: Cut a 35mm-45mm copper tube as a sample tube; Simulate sintering sample tube: Place the sample tube in the furnace chamber of the heating furnace and draw the vacuum degree of the furnace chamber to 10 -2 Pa, and then the temperature in the furnace chamber is raised to a simulated sintering temperature T, 940°C≤T≤980°C, the simulated sintering time is t, 100min≤t≤130min, and the heating time is 60min; Flattening the sample tube: the sample tube is naturally cooled to room temperature along with the furnace cavity, and the sample tube is taken out of the furnace cavity and flattened; Sample tube observation: observe the surface of the flattened sample tube. If the surface of the sample tube is smooth and flat, the copper tube is qualified. If the surface of the sample tube is concave and the area of ​​the concave is ≥2mm, the copper tube is qualified. 2 , then the copper tube is unqualified.

2. The sintering performance test method of a copper tube for a heat pipe according to claim 1, characterized in that: The heating furnace is a tubular furnace, the furnace chamber is formed by a quartz tube of the tubular furnace, the quartz tube is connected to a mechanical pump and a molecular pump, both of which are used to evacuate the quartz tube, and in the sample tube flattening step, a flattening machine is used to flatten the sample tube.

3. The sintering performance test method of a copper tube for a heat pipe according to claim 1, characterized in that: In the sample tube production step, the sample tube obtained by cutting has no obvious bends, and the inner and outer surfaces of the sample tube are smooth, without bump defects, lubricating oil and cleaning agent.

4. The sintering performance test method of a copper tube for a heat pipe according to claim 1, characterized in that: In the simulated sintering sample tube step, the wall thickness of the sample tube is s, and the relationship between the wall thickness s of the sample tube, the simulated sintering temperature T and the simulated sintering time t is as follows: When 0.05mm≤s≤0.1mm, T=950℃, t=100min; When 0.1mm<s≤0.2mm, T=980℃, t=120min; When 0.3mm<s≤0.5mm, T=975℃, t=130min; When s>0.5mm, T=950℃, t=130min.

5. The sintering performance test method of a copper tube for a heat pipe according to claim 1, characterized in that: In the step of flattening the sample tube, the relationship between the outer diameter D of the sample tube and the thickness h of the sample tube after flattening is D=2h.

6. The sintering performance test method of a copper tube for a heat pipe according to claim 1, characterized in that: In the sample tube flattening step, the relationship between the outer diameter D of the sample tube and the thickness h of the sample tube after flattening is as follows: When D = 5 mm, h = 2 mm; When D = 6 mm, h = 3 mm; When D = 8 mm, h = 4 mm; When D = 10 mm, h = 5 mm; When D=12mm, h=6mm.

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