Silica gel interface adhesion strength testing device and quantitative testing method thereof

Abstract

The invention provides a silica gel interface adhesion strength testing device and a quantitative testing method thereof, and the device comprises: a sample preparation assembly, which is provided with a cavity for accommodating 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 a cavity wall; the test assembly is used for testing a test piece composed of a sample plate and cured and formed silica gel, and the test assembly comprises two test ends which are oppositely arranged; wherein 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. Based on the technical scheme of the invention, the flowing of the silica gel can be effectively limited, and the effective defoaming of the silica gel can be ensured, so that the silica gel can be uniformly formed during curing, the silica gel can be conveniently demolded after being formed, and the influence on the test result caused by the damage of the colloid of the sample in the demolding process can be avoided; the adhesion strength of the silica gel can be conveniently and intuitively tested.

Description

technical field [0001] 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 technique [0002] In the power semiconductor packaging system, the main function of silicone gel is to improve the insulation strength inside the components, improve the impact resistance and improve the moisture-proof and anti-fouling performance of the device. The moisture-proof and anti-fouling performance of the device requires research on the adhesion of silicone gel and its degradation under environmental stress. At present, the test method of silicone gel is still at the qualitative level. Bonding, after curing, break it apart by hand to observe the damage of the glue. The integrity of the sample preparation by this method is uncontrollable, which has a great impact on the result judgment, and quantitative testing cannot be done. The main reason is that the...

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Problems solved by technology

The moisture-proof and anti-fouling performance of the device requires research on the adhesion of silicone gel and its degradation under environmental stress. At present, the test method of silicone gel is still at the qualitative level. Bonding, after curing, break it apart by hand to observe the damage of the glue. The integrity of the sample preparation by this method is uncontrollable, which has a great impact on the result judgment, and quantitative testing cannot be done. The main reason is that the silicone gel AB After the components are mixed, they are liquid with very low viscosity, and it is impossible to make a uniform sample through ordinary positioning. In addition, components AB need to be cured after mixing, and degassing is required before curing, which makes sample preparation difficult or uneven sample preparation will affect In addition, the cohesive force of silica gel is usually small, and the colloid may be damaged during the sample preparation process when the sample preparation component is heavy. The prepared samples were placed in an environmental chamber for processing, which made it difficult to study the degradation of silica gel adhesion under environmental stress.

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