CN112629368A - Structure and method for accurately measuring thickness of minimum interface of heat-conducting silicone grease - Google Patents
Structure and method for accurately measuring thickness of minimum interface of heat-conducting silicone grease Download PDFInfo
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- 229920001296 polysiloxane Polymers 0.000 title claims abstract description 49
- 239000004519 grease Substances 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000012360 testing method Methods 0.000 claims abstract description 26
- 238000005259 measurement Methods 0.000 claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 101
- 239000010959 steel Substances 0.000 claims description 101
- 210000003128 head Anatomy 0.000 claims description 62
- 238000004154 testing of material Methods 0.000 claims description 24
- 238000006073 displacement reaction Methods 0.000 claims description 15
- 238000005056 compaction Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 5
- 230000007797 corrosion Effects 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 240000004282 Grewia occidentalis Species 0.000 claims description 2
- 239000000843 powder Substances 0.000 abstract description 4
- 238000010998 test method Methods 0.000 abstract description 3
- 230000001174 ascending effect Effects 0.000 abstract 1
- 230000014759 maintenance of location Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
- G01B5/06—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness for measuring thickness
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Abstract
The invention relates to a structure and a method for accurately measuring the thickness of a minimum interface of heat-conducting silicone grease. The test structure provided by the invention comprises a lower base and an upper pressure head device, wherein the lower base can be used for horizontally calibrating zero; the test method comprises the steps of zeroing the lower base, setting the descending rate of the upper pressure head, setting the test pressure, testing the retention time, and increasing the ascending rate of the upper pressure head after the set time is reached. The advantage of this patent lies in easy and simple to handle, and degree of automation is high, can improve the measurement accuracy and the data repeatability height of heat conduction silicone grease product micron order powder effectively. Provides a better test means for the exploration of the performance of the heat-conducting silicone grease product and the practical application of the product.
Description
Technical Field
The invention relates to the technical field of measurement, in particular to a structure and a method for accurately measuring the thickness of a minimum interface of heat-conducting silicone grease.
Background
When high-power chips such as a semiconductor switch device, a radio frequency power amplifier chip, a central processing unit and the like run, a large amount of waste heat can be released, and the excellent joint filling and low thermal resistance characteristics of the heat-conducting silicone grease are very suitable for the scenes. The heat-conducting silicone grease is generally installed in a manner of pressing under a certain pressure, so that the minimum interface thickness (BLT) of the heat-conducting silicone grease can directly influence the heat-conducting performance, the construction and installation processes of field assembly, and the application characteristics of the heat-conducting silicone grease can be directly influenced by the accuracy of measurement of the minimum interface thickness.
The industry boundary measures the minimum interface thickness of the heat-conducting silicone grease, and mainly reads the thickness value along the strip when a thermal resistance meter tests the heat-conducting performance of the silicone grease. The current thermal resistance instrument generally adopts an LVDT thickness measurement principle, the displacement of the two electromagnetic coils is sensed through the voltage difference after the two electromagnetic coils move relatively, the theoretical precision is high, but in the practical operation, the industry generally reflects that the thickness measurement precision deviation of each thermal resistance instrument is large and even reaches the range of +/-20 mu m. This is unacceptable for heat conductive silicone greases with minimum interface thicknesses below 30 μm. Therefore, innovative and highly accurate testing equipment and method are needed for measuring the minimum interface thickness.
The parallelism adjusting table is arranged at the upper end of the first test table of the Chinese patent application 201910142278.5, but the parallelism adjusting table does not have the functions of pre-tightening, leveling and locking, so the operation error is likely to be larger when the low-thickness silicone grease is measured; meanwhile, the descending and lifting rates have great influence on the silicone grease with strong fluidity, and the silicone grease interface is easy to damage by the excessively fast moving rate, so that the patent does not greatly contribute to the thickness of the micron-sized silicone grease minimum interface; the chinese patent application 201710866721.4 is used to test the thickness of the layer to be tested of the transparent sample to be tested, and the heat conductive silicone grease is generally made of opaque material, so the above method cannot be used.
In summary, although there are some testing ideas for the thickness of the micro interface, there is a lack of a testing structure and method for the material with high fluidity and micron-sized powder particle size. At present, the thickness measurement of the existing heat-conducting silicone grease is generally realized by a thermal resistance instrument, the test error is large, the reproducibility is poor, and the accurate value of the minimum interface thickness cannot be simply and intuitively read.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a structure and a method for accurately measuring the minimum interface thickness of heat-conducting silicone grease, innovatively measures the numerical value of a sample by a high-precision material testing machine (the displacement precision is superior to 0.00001mm) in combination with an effective and rigorous testing method, the repeated testing precision can reach within +/-2 mu m, excellent scattered point distribution is achieved after multiple tests, the operation is simple and convenient, repeated experiments can be rapidly carried out after programming, and the process of similar tests is greatly simplified and accelerated.
The technical scheme of the invention is as follows:
the utility model provides a structure of minimum interface thickness precision measurement of heat conduction silicone grease which characterized in that:
the device comprises a lower base capable of horizontally zeroing and an upper pressure head device, wherein the lower base is square and comprises two lower base zeroing floating steel plates (4) and a lower base fixing steel plate (5), the two lower base zeroing floating steel plates (4) and the two lower base fixing steel plates (5) are arranged up and down, a left through hole, a middle through hole and a right through hole are formed in each corner of each lower base fixing steel plate (5), the left threaded hole, the middle threaded hole and the right threaded hole are used for pre-fixing, horizontal calibration and complete locking, and the left through hole and the right through hole of each corner of each lower base zeroing floating steel plate (4) correspond to the left threaded hole and the right threaded hole of each corner of each;
the left threaded hole is a pre-fixing threaded hole which is matched with a spring, and a certain clamping force is provided after a screw is screwed in from a through hole of the lower base zeroing floating steel plate (4) for pre-fixing the upper plate and the lower plate;
the middle threaded hole, namely the horizontal calibration hole, is provided with a screw, the screw is screwed into the lower base zero-setting floating steel plate (4) from the lower base fixing steel plate (5) and is propped against the lower base, and the height of four corners of the lower base zero-setting floating steel plate can be finely adjusted;
the right threaded hole is a complete locking hole and is provided with a screw, and the through hole of the lower base zeroing floating steel plate (4) is screwed into the right threaded hole of the lower base fixing steel plate (5) until the lower base is completely fixed.
Furthermore, go up the pressure head device and included pressure head (3) on the steel, connect last pressure head main shaft (1) of pressure head (3) on the steel, be provided with on going up pressure head main shaft (1) pressure head fixed orifices (2).
Furthermore, the lower part of the lower base fixing steel plate (5) is connected with a lower base main shaft (7), and a lower base fixing hole (6) is formed in the lower base main shaft (7).
Further, the lower base and the upper ram are made of stainless steel SUS304 which has high strength and is corrosion-resistant.
Furthermore, the lower base is square, the side length is 100 mm-200 mm, and the planeness is 0.01mm/100mm2And the surface has no burrs.
Furthermore, the upper pressure head is square, the side length is 15 mm-50 mm, and the flatness requirement is 0.01mm/100mm2And the surface has no burrs.
A method for accurately measuring the thickness of a minimum interface of heat-conducting silicone grease comprises the following steps:
s1, starting an Instron 5944 universal material testing machine, and installing a steel upper pressure head (3), a lower base zero-setting floating steel plate (4) and a lower base fixing steel plate (5) on the universal material testing machine;
s2, completely removing the torsion of the four-corner leveling nut of the lower base zeroing floating steel plate (4), starting the universal material testing machine, and carrying out zero clearing operation on the mechanical sensor; operating the steel upper ram (3) down into light contact until a force of 5N is generated, which means that at least one corner has contacted the base;
s3, observing the gap between the pressure head and the base by naked eyes; if the film can not be directly observed by naked eyes, a 25 mu PI film is inserted into the gap, and if the film can not be inserted, the side is pressed; if the PI film can be inserted, the gap is still left, the nut at the gap of the other three parts is adjusted by continuously lifting the upper pressure head by 10-20 mu m until the PI film with the thickness of 25 mu m cannot be inserted into any gap;
s4, after leveling is completed, mechanically locking four corners of the lower base zeroing floating steel plate (4), resetting the displacement of the universal material testing machine, finally completing a zeroing task, and lifting the steel upper pressure head (3) to an initial position;
s5, placing the heat-conducting silicone grease sample on the lower base zeroing floating steel plate (4) and leveling, wherein the area of the heat-conducting silicone grease sample is equal to the area of the positive direction surface of the steel upper pressure head (3);
s6, rapidly descending the steel upper pressure head (3) at the descending rate of more than or equal to 20mm/min in the initial stage until the position is about 1mm away from the lower base zeroing floating steel plate (4), and then switching the program to the descending rate of less than or equal to 1mm/min for fine displacement until compaction;
s7, keeping the compaction for 10min, if the numerical value within 30S does not fluctuate any more, indicating that the test value converges to the final value, and recording and archiving the thickness value;
and S8, slowly lifting the 3 upper pressure heads at a lifting speed of less than or equal to 1mm/min to prevent the vacuum effect of the sample from generating strong suction on the interface and damaging precision equipment, and switching to more than or equal to 20mm/min to quickly restore the upper pressure heads to the initial positions when the gap between the two planes is more than or equal to 1 mm.
Furthermore, the movement precision of the universal material testing machine is superior to 0.01mm/min, the precision of the displacement sensor is 0.00001mm, and the precision of the pressure sensor is within +/-0.3% of the reading.
By the scheme, the invention at least has the following advantages:
the method has the advantages of simple and convenient operation, high automation degree, capability of effectively improving the measurement precision of the micron-sized powder of the heat-conducting silicone grease product and high data repeatability. Provides a better test means for the exploration of the performance of the heat-conducting silicone grease product and the practical application of the product.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
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 a certain embodiment 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 the mechanical structure of the present invention
Reference numerals:
1-upper pressure head main shaft, 2-upper pressure head fixing hole, 3-steel upper pressure head, 4-lower base zeroing floating steel plate, 5-lower base fixing steel plate, 6-lower base fixing hole, 7-lower base main shaft, 8-horizontal calibration bolt, 9-pre-fixing bolt and 10-complete locking bolt.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Referring to fig. 1, in order to provide an accurate measurement structure of the minimum interface thickness of the thermal grease according to a preferred embodiment of the present invention,
the device comprises a lower base capable of horizontally zeroing and an upper pressure head device, wherein the lower base is square and comprises two lower base zeroing floating steel plates 4 and a lower base fixing steel plate 5 which are arranged up and down, each corner of each lower base zeroing floating steel plate 4 is provided with a left through hole, a right through hole and a left threaded hole, a middle threaded hole and a right threaded hole which are used for pre-fixing, horizontal calibration and complete locking, and the left through hole and the right through hole of each corner of each lower base zeroing floating steel plate 4 correspond to the left threaded hole and the right threaded hole of each corner of the lower base fixing steel plate 5;
the left threaded hole is a pre-fixing threaded hole which is matched with a spring, and a certain clamping force is provided after the screw is screwed in from the through hole of the lower base zeroing floating steel plate 4 for pre-fixing the upper plate and the lower plate;
the middle threaded hole, namely the horizontal calibration hole, is provided with a screw, the screw is screwed into the lower base zero-setting floating steel plate 4 from the lower base fixing steel plate 5, and the heights of four corners of the screw can be finely adjusted;
the right threaded hole is a complete locking hole and is provided with a screw, and the through hole of the lower base zeroing floating steel plate 4 is screwed into the right threaded hole of the lower base fixing steel plate 5 until the lower base is completely fixed.
The upper pressure head device comprises an upper steel pressure head 3 and an upper pressure head main shaft 1 connected with the upper steel pressure head 3, wherein an upper pressure head fixing hole 2 is formed in the upper pressure head main shaft 1.
The lower part of the lower base fixing steel plate 5 is connected with a lower base main shaft 7, and a lower base fixing hole 6 is formed in the lower base main shaft 7.
The lower base and the upper ram are made of stainless steel SUS304 with high strength and corrosion resistance.
-the lower base is square in size, the side length is 100 mm-200 mm, and the flatness is 0.01mm/100mm2And the surface has no burrs.
The upper pressure head is square, the side length is 15 mm-50 mm, and the flatness requirement is 0.01mm/100mm2And the surface has no burrs.
The test method adopted by the invention is as follows:
and (4) testing standard: ASTM D575-1991(2012) test method for rubber compression properties.
The test equipment adopted by the invention is as follows:
testing equipment: instron 5944 universal materials testing machine. The universal material testing machine has the moving precision superior to 0.01mm/min, the displacement sensor precision of 0.00001mm and the pressure sensor precision within +/-0.3% of the reading.
The sample sources adopted by the invention are as follows:
heat-conductive silicone grease a: shanghai Huitian New materials Co., Ltd;
heat-conductive silicone grease B: shin-and-Etsu chemical industry Co., Ltd;
heat-conductive silicone grease C: dow silicone (shanghai) ltd.
Example 1:
a method for accurately measuring the thickness of a minimum interface of heat-conducting silicone grease comprises the following steps:
s1, starting an Instron universal material testing machine, and installing a steel upper pressure head 3, a lower base zeroing floating steel plate 4 and a lower base fixing steel plate 5 on the universal material testing machine;
s2, completely removing the torsion of the leveling nuts at four corners of the lower base zeroing floating steel plate 4, starting the universal material testing machine, and carrying out zero clearing operation on the mechanical sensor; the steel upper ram 3 is operated to move down into light contact until a force of around 5N is generated, which means that at least one corner has contacted the base;
s3, observing the gap between the pressure head and the base by naked eyes; if the film can not be directly observed by naked eyes, a 25 mu PI film is inserted into the gap, and if the film can not be inserted, the side is pressed; if the PI film can be inserted, the gap is still left, the nut at the gap of the other three parts is adjusted by continuously lifting the upper pressure head by 10 mu m until the PI film with the thickness of 25 mu m cannot be inserted into any gap;
s4, after leveling is completed, mechanically locking four corners of the lower base zeroing floating steel plate 4, resetting the displacement of the universal material testing machine, finally completing a zeroing task, and lifting the steel upper pressure head 3 to an initial position;
s5, placing the heat-conducting silicone grease sample A on the lower base zeroing floating steel plate 4 and leveling, wherein the area of the heat-conducting silicone grease sample A is equal to the area of the positive direction surface of the steel upper pressure head 3;
s6, rapidly descending the steel upper pressure head 3 at the descending rate of 30mm/min in the initial stage until the position is about 1mm away from the lower base zeroing floating steel plate 4, and then switching the program to the descending rate of 0.9mm/min for fine displacement until the position is compacted;
s7, keeping the compaction for 10min, and indicating that the value is not fluctuated within 30S, that the test value is converged to the final value, and the thickness value of 23 μm can be recorded and archived;
and S8, slowly lifting the 3 upper pressure head at a lifting speed of 1mm/min to prevent the vacuum effect of the sample from generating strong suction on the interface and damaging precision equipment, and switching to 30mm/min to quickly restore the upper pressure head to the initial position when the gap between the two planes is larger than or equal to 1 mm.
Example 2:
a method for accurately measuring the thickness of a minimum interface of heat-conducting silicone grease comprises the following steps:
s1, starting an Instron universal material testing machine, and installing a steel upper pressure head 3, a lower base zeroing floating steel plate 4 and a lower base fixing steel plate 5 on the universal material testing machine;
s2, completely removing the torsion of the leveling nuts at four corners of the lower base zeroing floating steel plate 4, starting the universal material testing machine, and carrying out zero clearing operation on the mechanical sensor; the steel upper ram 3 is operated to move down into light contact until a force of around 5N is generated, which means that at least one corner has contacted the base;
s3, observing the gap between the pressure head and the base by naked eyes; if the film can not be directly observed by naked eyes, a 25 mu PI film is inserted into the gap, and if the film can not be inserted, the side is pressed; if the PI film can be inserted, the gap is still left, the upper pressure head is continuously lifted by 15 mu m, and the nuts at the gaps of the other three parts are adjusted until the PI film with the thickness of 25 mu m cannot be inserted into any gap;
s4, after leveling is completed, mechanically locking four corners of the lower base zeroing floating steel plate 4, resetting the displacement of the universal material testing machine, finally completing a zeroing task, and lifting the steel upper pressure head 3 to an initial position;
s5, placing the heat-conducting silicone grease sample B on the lower base zeroing floating steel plate 4 and leveling, wherein the area of the heat-conducting silicone grease sample B is equal to the area of the positive direction surface of the steel upper pressure head 3;
s6, rapidly descending the steel upper pressure head 3 at the descending rate of 20mm/min in the initial stage until the position is about 1mm away from the lower base zeroing floating steel plate 4, and then switching the program to the descending rate of 0.5mm/min for fine displacement until the position is compacted;
s7, keeping the compaction for 10min, and indicating that the value is not fluctuated within 30S, that the test value is converged to the final value, and the thickness value of 26um can be recorded and archived;
and S8, slowly lifting the 3 upper pressure heads at a lifting speed of 0.5mm/min to prevent the vacuum effect of the sample from generating strong suction on the interface and damaging precision equipment, and switching to 20mm/min to quickly restore the upper pressure heads to the initial positions when the gap between the two planes is larger than or equal to 1 mm.
Example 3:
a method for accurately measuring the thickness of a minimum interface of heat-conducting silicone grease comprises the following steps:
s1, starting an Instron universal material testing machine, and installing a steel upper pressure head 3, a lower base zeroing floating steel plate 4 and a lower base fixing steel plate 5 on the universal material testing machine;
s2, completely removing the torsion of the leveling nuts at four corners of the lower base zeroing floating steel plate 4, starting the universal material testing machine, and carrying out zero clearing operation on the mechanical sensor; the steel upper ram 3 is operated to move down into light contact until a force of around 5N is generated, which means that at least one corner has contacted the base;
s3, observing the gap between the pressure head and the base by naked eyes; if the film can not be directly observed by naked eyes, a 25 mu PI film is inserted into the gap, and if the film can not be inserted, the side is pressed; if the PI film can be inserted, the gap is still left, the nut at the gap of the other three parts is adjusted by continuously lifting the upper pressure head by 20 mu m until the PI film with the thickness of 25 mu m cannot be inserted into any gap;
s4, after leveling is completed, mechanically locking four corners of the lower base zeroing floating steel plate 4, resetting the displacement of the universal material testing machine, finally completing a zeroing task, and lifting the steel upper pressure head 3 to an initial position;
s5, placing the heat-conducting silicone grease sample C on the lower base zeroing floating steel plate 4 and leveling, wherein the area of the heat-conducting silicone grease sample C is equal to the area of the positive direction surface of the steel upper pressure head 3;
s6, rapidly descending the steel upper pressure head 3 at the descending rate of 20mm/min in the initial stage until the position is about 1mm away from the lower base zeroing floating steel plate 4, and then switching the program to the descending rate of 0.1mm/min for fine displacement until the position is compacted;
s7, keeping the compaction for 10min, and indicating that the value is not fluctuated within 30S, that the test value is converged to the final value, and the thickness value of 22um can be recorded and archived;
s8, slowly lifting the 3 upper pressure head at a lifting speed of 0.1mm/min to prevent the vacuum effect of the sample from generating strong suction on the interface and damaging precision equipment, and switching to 20mm/min to quickly restore the upper pressure head to the initial position when the gap between the two planes is larger than or equal to 1 mm.
The method has the advantages of simple and convenient operation, high automation degree, capability of effectively improving the measurement precision of the micron-sized powder of the heat-conducting silicone grease product and high data repeatability. Provides a better test means for the exploration of the performance of the heat-conducting silicone grease product and the practical application of the product.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (8)
1. The utility model provides a structure of minimum interface thickness precision measurement of heat conduction silicone grease which characterized in that:
the device comprises a lower base capable of horizontally zeroing and an upper pressure head device, wherein the lower base is square and comprises two lower base zeroing floating steel plates (4) and a lower base fixing steel plate (5), the two lower base zeroing floating steel plates (4) and the two lower base fixing steel plates (5) are arranged up and down, a left through hole, a middle through hole and a right through hole are formed in each corner of each lower base fixing steel plate (5), the left threaded hole, the middle threaded hole and the right threaded hole are used for pre-fixing, horizontal calibration and complete locking, and the left through hole and the right through hole of each corner of each lower base zeroing floating steel plate (4) correspond to the left threaded hole and the right threaded hole of each corner of each;
the left threaded hole is a pre-fixing threaded hole which is matched with a spring, and a certain clamping force is provided after a screw is screwed in from a through hole of the lower base zeroing floating steel plate (4) for pre-fixing the upper plate and the lower plate;
the middle threaded hole, namely the horizontal calibration hole, is provided with a screw, the screw is screwed into the lower base zero-setting floating steel plate (4) from the lower base fixing steel plate (5) and is propped against the lower base, and the height of four corners of the lower base zero-setting floating steel plate can be finely adjusted;
the right threaded hole is a complete locking hole and is provided with a screw, and the through hole of the lower base zeroing floating steel plate (4) is screwed into the right threaded hole of the lower base fixing steel plate (5) until the lower base is completely fixed.
2. The structure of claim 1, wherein the structure comprises: go up the pressure head device and included pressure head (3) on the steel, connect last pressure head main shaft (1) of pressure head (3) on the steel, be provided with on going up pressure head main shaft (1) pressure head fixed orifices (2).
3. The structure of claim 2, wherein the thickness of the minimum interface of the thermally conductive silicone grease is precisely measured by: the lower base fixing steel plate (5) is connected with a lower base main shaft (7) in the lower portion, and a lower base fixing hole (6) is formed in the lower base main shaft (7).
4. The structure of claim 3, wherein the thickness of the minimum interface of the thermally conductive silicone grease is measured accurately by: the lower base and the upper pressure head are made of stainless steel SUS304 with high strength and corrosion resistance.
5. The structure of claim 4, wherein the thickness of the minimum interface of the thermally conductive silicone grease is measured accurately by: the lower base is square, the side length is 100 mm-200 mm, and the planeness is 0.01mm/100mm2And the surface has no burrs.
6. The structure of claim 4, wherein the thickness of the minimum interface of the thermally conductive silicone grease is measured accuratelyThe method comprises the following steps: the upper pressure head is square, the side length is 15 mm-50 mm, and the flatness requirement is 0.01mm/100mm2And the surface has no burrs.
7. A method for accurately measuring the thickness of a minimum interface of heat-conducting silicone grease is characterized by comprising the following steps:
s1, starting an Instron 5944 universal material testing machine, and installing a steel upper pressure head (3), a lower base zero-setting floating steel plate (4) and a lower base fixing steel plate (5) on the universal material testing machine;
s2, completely removing the torsion of the four-corner leveling nut of the lower base zeroing floating steel plate (4), starting the universal material testing machine, and carrying out zero clearing operation on the mechanical sensor; operating the steel upper ram (3) down into light contact until a force of 5N is generated, which means that at least one corner has contacted the base;
s3, observing the gap between the pressure head and the base by naked eyes; if the film can not be directly observed by naked eyes, a 25 mu PI film is inserted into the gap, and if the film can not be inserted, the side is pressed; if the PI film can be inserted, the gap is still left, the nut at the gap of the other three parts is adjusted by continuously lifting the upper pressure head by 10-20 mu m until the PI film with the thickness of 25 mu m cannot be inserted into any gap;
s4, after leveling is completed, mechanically locking four corners of the lower base zeroing floating steel plate (4), resetting the displacement of the universal material testing machine, finally completing a zeroing task, and lifting the steel upper pressure head (3) to an initial position;
s5, placing the heat-conducting silicone grease sample on the lower base zeroing floating steel plate (4) and leveling, wherein the area of the heat-conducting silicone grease sample is equal to the area of the positive direction surface of the steel upper pressure head (3);
s6, rapidly descending the steel upper pressure head (3) at the descending rate of more than or equal to 20mm/min in the initial stage until the position is about 1mm away from the lower base zeroing floating steel plate (4), and then switching the program to the descending rate of less than or equal to 1mm/min for fine displacement until compaction;
s7, keeping the compaction for 10min, if the numerical value within 30S does not fluctuate any more, indicating that the test value converges to the final value, and recording and archiving the thickness value;
and S8, slowly lifting the 3 upper pressure heads at a lifting speed of less than or equal to 1mm/min to prevent the vacuum effect of the sample from generating strong suction on the interface and damaging precision equipment, and switching to more than or equal to 20mm/min to quickly restore the upper pressure heads to the initial positions when the gap between the two planes is more than or equal to 1 mm.
8. The method of claim 7, wherein the method comprises the steps of: the universal material testing machine has the moving precision superior to 0.01mm/min, the displacement sensor precision of 0.00001mm and the pressure sensor precision within +/-0.3% of the reading.
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| JP2008031706A (en) * | 2006-07-27 | 2008-02-14 | Toshio Iizuka | Steel sill packing with leveling and balancing function, for wooden building |
| CN102680477A (en) * | 2012-04-24 | 2012-09-19 | 浙江大学 | High precision leveling method and high precision leveling device for large optical element |
| CN205767680U (en) * | 2016-06-13 | 2016-12-07 | 深圳平显科技有限公司 | Pressure head auto-leveling mechanism |
| CN108188955A (en) * | 2017-12-29 | 2018-06-22 | 三英精控（天津）仪器设备有限公司 | A kind of high-precision parallelism adjusting instrument and method |
| CN207907796U (en) * | 2018-03-12 | 2018-09-25 | 力信（江苏）能源科技有限责任公司 | A kind of general thickness measuring tooling |
| CN109855584A (en) * | 2019-02-26 | 2019-06-07 | 上海市质量监督检验技术研究院 | A kind of pigment thickness test structure and test method |
| CN110726635A (en) * | 2019-12-02 | 2020-01-24 | 吉林大学 | Coaxiality adjusting system and coaxiality dimension reduction adjusting method based on strain gauge |
| CN211121853U (en) * | 2019-12-22 | 2020-07-28 | 山东广信工程试验检测集团有限公司 | A compact structure that is used for quiet rigidity test press of elastic cushion |
| CN211234225U (en) * | 2020-01-08 | 2020-08-11 | 苏州绵力电子材料科技有限公司 | Novel silica gel adhesive tape thickness gauge |
-
2020
- 2020-12-09 CN CN202011450110.XA patent/CN112629368A/en active Pending
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|---|---|---|---|---|
| JPH1177396A (en) * | 1997-09-09 | 1999-03-23 | Murata Mach Ltd | Press machine |
| JP2008031706A (en) * | 2006-07-27 | 2008-02-14 | Toshio Iizuka | Steel sill packing with leveling and balancing function, for wooden building |
| CN102680477A (en) * | 2012-04-24 | 2012-09-19 | 浙江大学 | High precision leveling method and high precision leveling device for large optical element |
| CN205767680U (en) * | 2016-06-13 | 2016-12-07 | 深圳平显科技有限公司 | Pressure head auto-leveling mechanism |
| CN108188955A (en) * | 2017-12-29 | 2018-06-22 | 三英精控（天津）仪器设备有限公司 | A kind of high-precision parallelism adjusting instrument and method |
| CN207907796U (en) * | 2018-03-12 | 2018-09-25 | 力信（江苏）能源科技有限责任公司 | A kind of general thickness measuring tooling |
| CN109855584A (en) * | 2019-02-26 | 2019-06-07 | 上海市质量监督检验技术研究院 | A kind of pigment thickness test structure and test method |
| CN110726635A (en) * | 2019-12-02 | 2020-01-24 | 吉林大学 | Coaxiality adjusting system and coaxiality dimension reduction adjusting method based on strain gauge |
| CN211121853U (en) * | 2019-12-22 | 2020-07-28 | 山东广信工程试验检测集团有限公司 | A compact structure that is used for quiet rigidity test press of elastic cushion |
| CN211234225U (en) * | 2020-01-08 | 2020-08-11 | 苏州绵力电子材料科技有限公司 | Novel silica gel adhesive tape thickness gauge |
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