About the advantages of PVD micro-nano coating
As a means of strengthening and modifying solid surface, coating has been widely used in mechanical, electronic, chemical, aerospace and other fields.With the development of science and technology, materials are required to serve under special conditions, such as ultra-high temperature, ultra-low temperature, ultra-high pressure, high vacuum, strong REDOX or corrosion environment, radiation, sound absorption signal shielding, point load and other conditions, which put forward higher requirements for the traditional coating.
Studies have shown that when a certain geometric size (particle size, diameter, film thickness, grain size) of a certain phase in a material is nanometer, the characteristics of the material will often be mutated. Due to surface effect, small size effect and quantum effects, the influence of nanometer materials in physical properties, mechanical properties appear in many different aspects such as macroscopic physical properties show the with high strength and high tenacity, high specific heat and thermal expansion rate, high conductivity and high magnetic conductivity, high absorbing, become an important research field in the 21st century, the development of science and technology front combining nanometer materials and surface coating technology of preparation of nano coating, which helps to expand the application of nanometer materials, at the same time provides conditions for coating technology to further improve.
Nanomaterials coating is to add nanomaterials to the surface coating to obtain the nanocomposite system coating. Nano-coatings can be applied to either conventional material substrates, powder particles or fibers. It is one of the hot spots in nanomaterials research in recent years. The main research focuses on functional coatings, including coatings on the surface of traditional materials, fiber coatings and particle coatings. The performance of nano coating is reflected in the following aspects:
(1) adding nano phase can improve the hardness and wear resistance of the coating and maintain a high toughness; (2) improve the high temperature resistance and oxidation resistance of the material; (3) improve the corrosion resistance of the matrix to achieve the purpose of surface modification and decoration; (4) to achieve the effect of reducing the friction coefficient, forming R lubrication material; (5) nanomaterial coating has a wide range of optical properties, excellent electromagnetic properties.
According to the composition of nano-coating, it can be divided into the following categories:
(1)0-0 composite, that is, nano-solid formed by the composite of nano-particles of different components, phases or different types, is usually achieved by in-situ compaction, phase transformation and other methods, with nano-heterogeneous structure, also known as aggregation type. (2)0-3 composite, that is, nanoparticles are dispersed in conventional three-dimensional solids. In addition, mesoporous solid can also be used as a composite matrix to fill nanoparticles in the mesoporous by physical or chemical methods to form a mesoporous composite nano-composite material. (3)0-2 composite, that is, nano particles are dispersed into two-dimensional thin film materials, which can be divided into uniform dispersion and non-uniform dispersion, known as nano composite thin film materials.
0-0 composite, 0-3 composite complete nanomaterial coating is still some way from commercialization. With the help of traditional coating technology, 0-2 composite coating system can be obtained by adding nano-materials, so that the function of the traditional coating can be improved by leaps and bounds, without too much cost increase in technology, which has been rapidly developed in recent years.
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