What Are The Upmarket Applications for Ultra-fine Alumina Powder?
Views : 495
Update time : 2019-07-23 11:20:48
Ultrafine alumina powder is an indispensable material in modern industry. After ultrafine and fine-grained alumina powder, its surface electronic structure and crystal structure have changed, resulting in surface effects and small sizes that are not found in macroscopic objects. Effects, quantum effects, and macroscopic quantum tunneling effects, and have excellent properties such as high strength, high hardness, abrasion resistance, corrosion resistance, high temperature resistance, oxidation resistance, good insulation, and large surface area. Currently, they are in bioceramics, precision ceramics, Chemical catalysts, rare earth trichromatic phosphors, integrated circuit chips, and aerospace light source devices have been widely used.
1. Ceramic materials and composite materials：
The addition of ultrafine alumina powder in conventional ceramics can improve the toughness of ceramics and lower the sintering temperature. Due to the superplasticity of ultrafine alumina powder, the limitation of the application range of low temperature plastics is solved, so it is obtained in low temperature plastic ceramics. A wide range of applications.
The use of ultra-fine alumina powdercan also synthesize a new type of composite ceramic material with special functions and aluminum alloy ultra-fine composite material. Among them, SiC-Al2O3 ultra-fine composite material is the most prominent, and its flexural strength is increased from 300-400 MPa to 1 GPa for single-phase silicon carbide ceramics, and the fracture toughness of the material is also increased by more than 40%.
Ultra-fine alumina can also be used as dispersion strengthening and additives. For example, when cast iron laps are cast, ultra-fine alumina powder is used as metamorphic nucleation, and the wear resistance can be increased several times or more.
2, Surface protective layer material:
A new ultra-thin transparent material consisting of ultra-fine alumina particles coated on the surface of metals, ceramics, plastics and hard alloys to improve surface hardness, corrosion resistance and wear resistance, as well as anti-fouling and anti-fouling Dust, waterproof and other functions can solve the problems of easy wear parts in modern industrial production and easy corrosion of pipes, which indirectly affect the service life of equipment and the accuracy of processed products. Therefore, it can be applied to surface protection of machinery, tools, chemical pipes, and the like.
Among them, the ultra-fine alumina ceramic coating tool combines the advantages of ceramic material and cemented carbide material, and has the same toughness and hardness as the cemented carbide material, and the wear resistance is greatly improved, and the number of uncoated tools can be achieved. It is multiplied by several times and the processing efficiency is remarkably improved.
3. Catalyst and its carrier:
Ultra-fine alumina has good pore size distribution, high pore volume, surface area of up to 60-400 m2/g, surface atomic coordination, etc., which leads to many mismatching bonds and under-oxygen bonds on the surface, and the surface smoothness with the decrease of particle size. Deterioration, forming an uneven atomic step, increasing the contact surface of the chemical reaction, is an ideal catalyst or catalyst carrier. The HDS activity of the ultrafine alumina particle-loaded Co-Mo catalyst is higher than that of the common alumina-loaded Co-Mo. The HDS activity of the catalyst.
The main application of catalyst and carrier is γ-Al2O3, which is widely used in automobile exhaust gas purification, catalytic combustion, hydrodesulfurization, petroleum refining, and polymer synthesis.
4. Biological and medical materials:
The ultrafine alumina bioceramic does not substantially corrode in a physiological environment, and has good structural compatibility. The new tissue grows into the pores of the porous ceramic surface, and the bonding strength with the body tissue is high, and It has high strength, low friction coefficient and low wear rate. Therefore, it has been widely used in clinical practice, and has been used to produce artificial bones, joint restorations, root implants, fractured splints and internal fixation devices. It has also successfully performed alveolar ridge expansion and reconstruction of maxillofacial defects. , facial features or repairs.
At present, research is being focused on soft tissue materials such as artificial airways, as well as bioceramic materials that simulate biological functions and artificial intelligence.
5, Semiconductor materials:
Ultra-fine alumina powder has a very large surface area and interface, which is very sensitive to the external environment moisture. The change of ambient temperature quickly causes changes in surface or interface ion valence and electron transport. In the range of humidity 30-80%, the ultra-fine alumina AC impedance changes linearly, with fast response, high reliability, high sensitivity, long anti-aging life, resistance to other gas erosion and pollution, and can be maintained in dusty smoke environment. The detection accuracy is an ideal moisture sensitive sensor and wet electric thermometer material.
In addition, ultra-fine alumina is a commonly used substrate material, which has good electrical insulation, chemical durability, heat resistance, strong radiation resistance, high dielectric constant, uniform surface, low cost, etc., and can be used in semiconductors. Substrate materials for devices and LSIs are widely used in the microelectronics, electronics, and information industries.
6, Optical materials:
Nanoscale alumina absorbs ultraviolet light and, under excitation of certain wavelengths of light, produces light waves of wavelengths associated with particle size. It can be used as a protective coating film for the phosphor layer in a compact fluorescent lamp, and can also be combined with a rare earth phosphor to form a luminescent material for a fluorescent tube to improve the life of the tube.
Ultra-fine alumina is also an excellent anti-ultraviolet absorber. Adding ultra-fine γ-Al2O3 powder to compact fluorescent lamps can reduce lamp light decay and improve lamp yield.
The surface of the alumina granules is coated with a layer of non-hazardous polymer that can also be added to sunscreens and cosmetics.
It is precisely because ultrafine alumina powder has a series of excellent electrical, magnetic, optical, mechanical and chemical macroscopic properties compared with conventional particles. Therefore, in recent years, high purity ultrafine alumina powder has been prepared as a new material research field in the world. One of the directions.
Luoyang Trunnano Tech Co., Ltd (TRUNNANO) is a professional ultra-fine alumina powder manufacturer with over 12 years experience in chemical products research and development. If you are looking for high qualityultra-fine alumina powder, please feel free to contact us and send an inquiry.
