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1. Overview of ultrafine powder 1.1 Definition of ultrafine powder There is no completely consistent statement about the particle size boundaries of ultrafine powders. Due to the difference in the use, preparation method and technical level of ultrafine powders in various countries and industries, the particle size of ultrafine powders is divided. For example, the particle size of ultrafine powder...
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Since ultrafine powder has surface effect, small size effect, quantum effect and macroscopic quantum tunneling effect, it has many special properties in catalytic, optical, magnetic and mechanical properties compared with crystalline materials of the same composition. There are many important applications in the fields of medicine, microelectronics, and nuclear technology. "Plasma milling" refers ...
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The gold we usually see is golden yellow, but the nano gold powder is pink; the iron can not be ignited at normal temperature, but the nano iron powder can ignite. Why did these metals become tiny nanoparticles and the properties changed completely? Now let's take a closer look at the skills of nano gold particles and see how they have wonderful functions. 1.Smart microcircuit Behind the LCD scree...
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The purpose of surface modification of ultrafine powder is: 1. In order to improve or change the dispersibility of powder particles; 2. Improve durability, such as resistance, light resistance, heat resistance, weather resistance, etc.; 3. Improve particle surface activity; Adding new physical, chemical and mechanical properties and new functions to the surface of the particles to increase the add...
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The purpose of surface modification of ultrafine powder is: 1. In order to improve or change the dispersibility of powder particles; 2. Improve durability, such as resistance, light resistance, heat resistance, weather resistance, etc.; 3. Improve particle surface activity; Adding new physical, chemical and mechanical properties and new functions to the surface of the particles to increase the add...
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The purpose of surface modification of ultrafine powder is: 1. In order to improve or change the dispersibility of powder particles; 2. Improve durability, such as resistance, light resistance, heat resistance, weather resistance, etc.; 3. Improve particle surface activity; Adding new physical, chemical and mechanical properties and new functions to the surface of the particles to increase the add...
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First, capsule modification Capsule modification is a surface modification method in which a film of a uniform thickness and a film having a certain thickness is coated on the surface of the powder particles. Rong et al. encapsulated TiO2 composite particles coated with Al2O3 and SiO2 with polystyrene, which effectively improved the absorbance and stability of the material. Zhu Liqun and other met...
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The application of nanomaterials in surface engineering is mostly to stabilize the nanoparticle dispersion in the organic medium. For example, the workpiece is ground and the antifriction material is dispersed in the lubricating oil in an appropriate manner. The ultrafine polishing liquid is nanometer SiO2, nanometer. Lubricants for nanoparticles such as Al2O3, nano-MoS2, nano-Cr2o3, and nano-diam...
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Silicon carbide whiskers are a kind of single-crystal fiber with a certain length-to-diameter ratio, which has very good high temperature resistance and high strength. It is mainly used in toughening applications where high temperature and high strength applications are required. Such as: aerospace materials, high-speed cutting tools. At present, it has a very high performance-price ratio. Silicon...
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Titanium is a chemical element, chemical symbol Ti, atomic number 22, located in the fourth cycle of the chemical periodic table, group IVB. It is a silver-white transition metal characterized by light weight, high strength, metallic luster and resistance to wet chlorine gas. The most common compound of titanium is titanium dioxide, which can be used to make white pigments. In the past, people use...
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ZrB2 ceramic materials have extremely high melting point, strength, hardness and electrical conductivity (and the temperature coefficient of conductivity is positive), as well as a low coefficient of thermal expansion. In addition, they have good chemical stability, flame retardancy, heat resistance, corrosion resistance and Lightweight and other special properties, so it is very widely used. 1.1 ...
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Preparation method and introduction of nano silicon carbide powder infrared radiation coating 1.1 Ingredients Powder radiant mixture: 40 to 80 parts by weight of nano SiC (SiC) powder raw material, and zirconia (ZrO2) powder raw material 5 to 30 based on the weight fraction of (D50 is 40 nm, β phase) nano SiC powder raw material. 5 parts by weight or less of chromium oxide (Cr2O3) powder raw mater...
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