CN114112902A - Silicon gel interface adhesion strength testing device and quantitative testing method thereof - Google Patents
Silicon gel interface adhesion strength testing device and quantitative testing method thereof Download PDFInfo
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- CN114112902A CN114112902A CN202111543444.6A CN202111543444A CN114112902A CN 114112902 A CN114112902 A CN 114112902A CN 202111543444 A CN202111543444 A CN 202111543444A CN 114112902 A CN114112902 A CN 114112902A
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- 238000012360 testing method Methods 0.000 title claims abstract description 96
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims description 5
- 229910052710 silicon Inorganic materials 0.000 title claims description 5
- 239000010703 silicon Substances 0.000 title claims description 5
- 239000000499 gel Substances 0.000 claims abstract description 86
- 229920001296 polysiloxane Polymers 0.000 claims abstract description 81
- 239000000741 silica gel Substances 0.000 claims abstract description 27
- 229910002027 silica gel Inorganic materials 0.000 claims abstract description 27
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000000853 adhesive Substances 0.000 claims abstract description 24
- 230000001070 adhesive effect Effects 0.000 claims abstract description 24
- 238000002360 preparation method Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000012113 quantitative test Methods 0.000 claims description 5
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 239000000084 colloidal system Substances 0.000 abstract description 5
- 239000007788 liquid Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 230000006353 environmental stress Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
Abstract
The invention provides a device and a method for testing the adhesive strength of a silicone gel interface quantitatively, wherein the device comprises: the sample preparation assembly is provided with a cavity for containing the silica gel, one side of the cavity is provided with an opening part, and two opposite sides of the cavity are respectively provided with a sample plate forming the cavity wall of the cavity; the testing component is used for testing a testing piece consisting of a sample plate and cured and molded silicone gel and comprises two testing ends which are oppositely arranged; wherein, two test ends can two model of fixed connection respectively to two model of drive respectively move along the direction of keeping away from each other. Based on the technical scheme of the invention, the flow of the silicone gel can be effectively limited, the silicone gel can be effectively defoamed, the silicone gel can be uniformly molded during curing, demolding after the silicone gel is molded is facilitated, the situation that the test result is influenced due to the fact that the colloid of a sample is damaged in the demolding process is avoided, the sample plate is connected with the stretching rod through the adhesive, and the adhesion strength of the silicone gel can be conveniently and visually tested.
Description
Technical Field
The invention relates to the technical field of silicone gel, in particular to a silicone gel interface adhesion strength testing device and a quantitative testing method thereof.
Background
In a power semiconductor packaging system, the silica gel mainly has the functions of improving the insulation strength inside components, improving the impact resistance and improving the moisture and dirt resistance of the components. The damp-proof and dirt-proof performance of the device requires to research the adhesiveness of the silicone gel and the deterioration condition of the adhesiveness in environmental stress, the existing silicone gel test mode still stays at a qualitative level, for example, a test board is bonded with the silicone gel, the damage condition of the adhesive is observed by breaking off with hands after curing, the integrity of sample preparation by the method is uncontrollable, the result judgment is greatly influenced, and the quantitative test cannot be carried out, mainly because the silicone gel components are in a liquid state with low viscosity after mixing, uniform samples cannot be prepared through common positioning, in addition, the AB components need to be cured after mixing, the sample preparation difficulty is large or the sample preparation unevenness can influence the stability of the result due to defoaming before curing, in addition, the cohesion of the silicone gel is usually small, the colloid in the sample preparation process can be damaged when the sample preparation component has large self weight, and the traditional adhesive quantitative method is difficult to test, the prepared sample is not easy to be put into an environmental chamber for processing, so that the degradation research of the silica gel adhesion under environmental stress is difficult to be carried out.
Disclosure of Invention
To the problem among the above-mentioned prior art, this application has proposed a silica gel interface adhesion strength testing arrangement, can realize the quantitative test of silica gel interface adhesion strength.
The invention relates to a device for testing the adhesive strength of a silicone gel interface, which comprises:
a sample preparation assembly which is provided with a cavity for containing the silica gel, wherein one side of the cavity is provided with an opening part, and two opposite sides of the cavity are respectively provided with a sample plate forming the cavity wall of the cavity;
the testing component is used for testing a testing piece consisting of the sample plate and the cured and molded silicon gel and comprises two testing ends which are oppositely arranged;
the two test ends can be respectively and fixedly connected with the two sample plates so as to respectively drive the two sample plates to move along the directions away from each other.
In one embodiment, the sample preparation assembly further comprises a jig having a groove enclosing the cavity with the template on both sides, by which embodiment the flow of the silicone gel can be restricted before it is cured.
In one embodiment, the fixture is formed by clamping two plug connectors matched with each other; the connector clip is L type structure to form the recess of fixture, through this embodiment for can unpack the fixture that the joint formed apart after the silica gel solidifies through high temperature, be convenient for the silica gel drawing of patterns, thereby obtain by behind model and the solidification shaping the test piece that the silica gel constitutes.
In one embodiment, the fixture is made of polytetrafluoroethylene, so that the fixture can not deform during high-temperature curing and cannot influence the silica gel forming.
In one embodiment, the template is fixed at the two opposite open ends of the groove through fasteners, and the template is clamped at the two opposite open ends of the groove through the fasteners, so that the cavity can be kept stable, the silicone gel is prevented from seeping out when in a liquid state, and the silicone gel can be uniformly molded in the cavity.
In one embodiment, the test end comprises a stretching portion, one end of the stretching portion is fixed on the sample plate through an adhesive, and the other end of the stretching portion is connected with a driving assembly.
A method for quantitative testing of the above device, comprising:
injecting the silica gel into a cavity in the sample preparation assembly, and curing at high temperature after the silica gel is defoamed;
demolding the cured silicone gel to obtain a test piece consisting of two sample plates and the silicone gel;
the test piece was subjected to an adhesion strength test using a test assembly and its failure type was recorded.
In one embodiment, the test piece is subjected to an adhesion strength test using a test assembly comprising:
measuring the interfacial adhesion area between the silicone gel and the template;
connecting the test piece by using a testing machine and driving the sample plates to move along the directions away from each other;
recording the load of the silicone gel as it separates from the template to obtain the adhesive strength of the silicone gel; by the embodiment, the adhesive strength of the silicone gel can be obtained by conveniently recording the load and the interface adhesive area between the silicone gel and the sample plate.
In one embodiment, recording the load at which the silicone gel breaks away from the template comprises:
recording the load when the silicone gel is separated from the sample plate through a stretching part connected with the sample plate on the testing machine; in this embodiment, the stress of the silicone gel when it is separated from the sample plate can be directly observed by the stretching portion, and the load when the silicone gel interface is broken can be conveniently recorded.
In one embodiment, the testing machine drives the sample plates to move away from each other and perpendicular to the length direction of the silicone gel, and by this embodiment, the sample plates are pulled perpendicular to the length direction of the silicone gel to obtain the maximum load when the silicone gel is separated from the sample plates.
The features mentioned above can be combined in various suitable ways or replaced by equivalent features as long as the object of the invention is achieved.
Compared with the prior art, the device and the method for testing the adhesive strength of the silicone gel interface provided by the invention at least have the following beneficial effects:
(1) the flow of the silica gel can be effectively limited, the effective defoaming of the silica gel can be ensured, and the silica gel can be uniformly molded during curing.
(2) The demolding after the silica gel molding is convenient, and the test result is prevented from being influenced by the damage of the colloid of the sample in the demolding process.
(3) The sample plate is connected with the stretching rod through the adhesive, so that the adhesive force of the silicone gel can be conveniently and visually tested.
(4) The size of the silica gel can be determined through the fixture, and quantitative calculation of the adhesive strength is facilitated.
Drawings
The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:
FIG. 1 shows a schematic structural diagram of a test apparatus according to an embodiment of the present invention;
FIG. 2 shows a schematic view of a fixture according to an embodiment of the invention;
FIG. 3 shows a schematic structural diagram of a test assembly of one embodiment of the present invention;
FIG. 4 shows a test flow diagram of one embodiment of the present invention.
In the drawings, like parts are provided with like reference numerals. The drawings are not to scale.
Reference numerals:
1-template, 2-fixture, 3-fastener, 4-testing end, 201-first clamping piece, 202-second clamping piece, 203-convex part, 204-concave part and 205-cavity.
Detailed Description
The invention will be further explained with reference to the drawings.
The invention provides a device for testing the adhesion strength of a silicone gel interface, which comprises:
the sample preparation assembly is provided with a cavity for containing the silica gel, one side of the cavity is provided with an opening part, and two opposite sides of the cavity are respectively provided with a sample plate forming the cavity wall of the cavity;
the testing component is used for testing a testing piece consisting of a sample plate and cured and molded silicone gel and comprises two testing ends which are oppositely arranged;
wherein, two test ends can two model of fixed connection respectively to two model of drive respectively move along the direction of keeping away from each other.
Specifically, as shown in fig. 1 and 3, the sample preparation assembly has a cavity 205 for accommodating silicone gel, one side of the cavity has an opening, and two opposite sides of the cavity respectively have a sample plate 1 forming a cavity wall thereof; the test component comprises two opposite test ends 4, and the two test ends 4 are respectively and fixedly connected with the two sample plates 2.
In one embodiment, as shown in fig. 1 and 2, the sample preparation assembly further comprises a fixture 2, wherein the fixture 2 is provided with a groove, and the groove and the sample plates 1 on two sides form a cavity 205, so that the flow of the silicone gel is limited before the silicone gel is solidified, and the uniform molding of the silicone gel is ensured.
In one embodiment, as shown in fig. 2, the fixture 2 is formed by two mating connectors; the plug connector comprises a first plug connector 201 and a second plug connector 202, and the first plug connector 201 and the second plug connector 202 are respectively provided with a concave part 204 and a convex part 203 which can be mutually matched; the plug connector all is L type structure, forms the recess of fixture 2 when first plug connector 201 and the mutual joint of second plug connector 202 for can unpack fixture 2 that the joint formed apart after the silica gel through high temperature curing, the silica gel drawing of patterns of being convenient for, thereby obtain the test piece that comprises the silica gel after model 1 and the solidification shaping.
In one embodiment, a self-locking portion is disposed between the concave portion 204 and the convex portion 203, so that the first plug 201 and the second plug 202 are not easily loosened after being clamped, and the silicone gel of the liquid is prevented from leaking to affect the uniformity of the formed product.
In one embodiment, fixture 2 is made of a material that is resistant to high temperatures, so that fixture 2 is not deformed during the high-temperature curing process, and the problem that the uniformity of the silicone gel is damaged due to extrusion of fixture 2 during the silicone gel forming process is avoided.
In particular, the fixture 2 is made of polytetrafluoroethylene.
In one embodiment, as shown in fig. 1, the sample plate 1 is fixed to the two opposite open ends of the groove by the fasteners 3, and the sample plate 1 is clamped to the two opposite open ends of the groove by the fasteners 3, so that the cavity 205 can be kept stable, the silicone gel is prevented from seeping out when in a liquid state, and the silicone gel can be uniformly molded in the cavity 205.
Specifically, the fastener 3 includes a clamping portion provided on both sides of the template 1 and a clamping portion that adjusts the clamping portion, so that the cavity 205 constituted by the template 1 and the jig 2 is kept stable.
In one embodiment, the testing end 4 comprises a stretching portion, one end of the stretching portion is fixed on the sample plate 1 through an adhesive, the other end of the stretching portion is connected with a driving assembly, the driving assembly drives the stretching portion to separate the sample plate 1 from the silicone gel, so that the acting force of the stretching portion on the sample plate when the sample plate 1 is separated from the silicone gel can be recorded conveniently, and therefore the adhesive strength of the silicone gel interface can be obtained.
Specifically, the stretching part is a stretching rod, the driving assembly is a testing machine, a clamping tool of the testing machine clamps one end of the stretching rod, the other end of the stretching rod is connected with the sample plate 1, a certain stretching speed is set on the testing machine, so that the sample plate 1 and the silicone gel are gradually separated, and the load of the sample plate 1 and the silicone gel is recorded through the stretching rod in the separation moment.
A quantitative test method using the device for testing the adhesion strength of the silicone gel interface as shown in fig. 4, comprising:
step S10, injecting silica gel into the cavity in the sample preparation assembly, and curing at high temperature after the silica gel is defoamed;
step S20, demolding the cured silicone gel to obtain a test piece consisting of two sample plates and the silicone gel;
and step S30, carrying out adhesion strength test on the test piece by using the test assembly and recording the damage type of the test piece.
Wherein, utilize the test subassembly to carry out adhesion strength test to the test piece, include:
step S31, measuring the interface adhesion area between the silicone gel and the sample plate;
step S32, connecting the test piece by using a testing machine and driving the sample plates to move along the directions away from each other;
step S33, recording the load when the silicone gel is separated from the sample plate; so as to obtain the adhesive strength of the silicone gel, and the adhesive strength of the silicone gel can be obtained by conveniently recording the load and the interface adhesive area between the silicone gel and the sample plate.
Specifically, the adhesive strength of the silicone gel is F/S;
wherein, the load when the F-silica gel is separated from the sample plate, and the adhesive area between the S-colloid and the interface;
it should be noted that, the adhesive area S between the colloid and the interface is measured before the test, which can be directly determined by the fixture, so as to facilitate the quantitative calculation of the adhesive strength.
In one embodiment, recording the load at which the silicone gel breaks away from the template comprises:
recording the load of the sample plate when the sample plate is separated from the silicone gel through a tensile rod connected with the sample plate on a testing machine; the stress condition of the silicone gel when the silicone gel is separated from the sample plate can be directly observed by utilizing the stretching rod, and the load of the silicone gel when the interface is damaged can be conveniently recorded.
In one embodiment, the test machine drives the sample plates to move away from each other and perpendicular to the length of the silicone gel, pulling the sample plates perpendicular to the length of the silicone gel to obtain the maximum load when the silicone gel is released from the sample plates.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.
Claims (10)
1. A silicone gel interface adhesion strength testing device is characterized by comprising:
a sample preparation assembly which is provided with a cavity for containing the silica gel, wherein one side of the cavity is provided with an opening part, and two opposite sides of the cavity are respectively provided with a sample plate forming the cavity wall of the cavity;
the testing component is used for testing a testing piece consisting of the sample plate and the cured and molded silicon gel and comprises two testing ends which are oppositely arranged;
the two test ends can be respectively and fixedly connected with the two sample plates so as to respectively drive the two sample plates to move along the directions away from each other.
2. The apparatus for testing adhesion strength of a silicone gel interface as claimed in claim 1, wherein the sample preparation assembly further comprises a jig having a groove, and the groove and the sample plates on both sides define the cavity.
3. The device for testing the adhesion strength of the silicone gel interface as recited in claim 2, wherein the fixture is formed by clamping two matched plug connectors; the plug connector is of an L-shaped structure so as to form a groove of the fixture.
4. The silicone gel interface adhesion strength testing device of claim 2, wherein the clip is made of polytetrafluoroethylene.
5. The silicone-gel interface adhesion strength testing apparatus of claim 2, wherein the template is secured to the two opposite open ends of the recess by fasteners.
6. The apparatus for testing interfacial adhesion strength of silicone gel according to claim 1, wherein the testing end comprises a stretching portion, one end of the stretching portion is fixed on the sample plate by an adhesive, and the other end is connected with a driving assembly.
7. A quantitative test method applied to the silicon gel interface adhesion strength test device according to any one of claims 1 to 6, characterized by comprising:
injecting the silica gel into a cavity in the sample preparation assembly, and curing at high temperature after the silica gel is defoamed;
demolding the cured silicone gel to obtain a test piece consisting of two sample plates and the silicone gel;
the test piece was subjected to an adhesion strength test using a test assembly and its failure type was recorded.
8. The quantitative test method of the silicone gel interface adhesion strength test device according to claim 7, wherein the performing of the adhesion strength test on the test piece by using the test assembly comprises:
measuring the interfacial adhesion area between the silicone gel and the template;
connecting the test piece by using a testing machine and driving the sample plates to move along the directions away from each other;
the load at which the silicone gel was pulled off the template was recorded to obtain the adhesive strength of the silicone gel.
9. The method of claim 8, wherein recording the load of the silicone gel when it is separated from the sample plate comprises:
the load when the silicone gel separated from the sample plate was recorded by a stretching portion of the testing machine connected to the sample plate.
10. The method as claimed in claim 8, wherein the testing machine drives the templates to move away from each other and perpendicular to the length direction of the silicone gel.
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| CN202111543444.6A CN114112902A (en) | 2021-12-16 | 2021-12-16 | Silicon gel interface adhesion strength testing device and quantitative testing method thereof |
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| CN202111543444.6A CN114112902A (en) | 2021-12-16 | 2021-12-16 | Silicon gel interface adhesion strength testing device and quantitative testing method thereof |
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