Multi-layer thin-film material is a layer of material with a thickness of only nanometers, and then one or more other thin-layer materials with different properties, and finally a multi-layer solid coating is formed. Due to the different electrical, magnetic and chemical properties of each layer of material, multilayer thin-film materials will have some strange characteristics. At present, this new material with simple manufacturing process is attracting attention from various countries. It has entered the commercial stage from laboratory research and can be widely used in anti-corrosion coatings, fuel cells and biomedical transplantation. Multilayer films are widely used by enterprises due to their excellent performance and low cost. Multilayer film analysis is an excellent and practical technology that combines slicing technology and micro infrared technology. These two technologies are the key points of multilayer film analysis and are also difficult. Cut cleanly and beautifully, and see clearly before you can fully analyze each layer. Take the test sample sent by an enterprise as an example:
The picture above is the effect diagram after the film is sliced. The red line area is the fixture, which acts as a fixed film. In the picture, we can find that the film has 4 layers from left to right, and the layering is obvious, and the effect has reached the expected goal. The more obvious the layered structure is, the better it is for analysis and testing. Then cut the film to 5 microns and place it on a gold-plated glass lens to test the sample using the reflection method.
1 layer, 2 layer IR spectrum
3 layer, 4 layer IR spectrum
Test Results:
The main component of the first and second layers in the sample is polyester (PET);
The main components of the third and fourth layers in the sample are polyester (PET).
Conclusion : According to the above test results, infrared spectroscopy can clearly distinguish the components of the multilayer film.
Testing equipment:
1) Fourier transform microscopic infrared spectrometer (IN10);
2) Thermo Finesse E + semi-automatic paraffin slicer.
Introduction
MTT is a third-party laboratory engaged in the quality inspection, identification, certification and failure analysis services of materials and components.
Asymmetric Thyristor
Asymmetric Thyristor is the abbreviation of thyristor, also known as silicon controlled rectifier, formerly referred to as thyristor; thyristor is PNPN four-layer semiconductor structure, it has three poles: anode, cathode and control pole; thyristor has silicon rectifier The characteristics of the parts can work under high voltage and high current conditions, and their working processes can be controlled and widely used in electronic circuits such as controlled rectifiers, AC voltage regulators, contactless electronic switches, inverters, and inverters.
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