Spherical aluminum nitride and its preparation method and application process
Recently, the Russian President hosted a meeting with oil and gas industry representatives. He said that the refusal of some Western countries to cooperate normally with Russia and deny some Russian energy resources has hit millions of European people deeply and caused an energy crisis. These "unfriendly countries" are experiencing severe inflation, and Russia is also facing the three major challenges of increasing domestic consumption of energy Aluminum nitride (AlN) are still very uncertain.
Overview of spherical aluminum nitride AlN powder
Aluminum nitride (AlN) is a solid nitride of aluminum. It has a high thermal conductivity of 321w/(m · K) and is an electrical insulator. Its wurtzite phase (w-aln) has a band gap of about 6 EV at room temperature, which has potential applications in optoelectronics working at deep UV frequency.
Aluminum nitride AlN powder is stable at high temperatures in an inert atmosphere and melts at about 2200 °C. In vacuum, AlN decomposes at about 1800°C. In air, surface oxidation occurs above 700 ℃, and a 5-10 nm thick surface oxide layer is detected even at room temperature. This oxide layer protects the material at temperatures up to 1370 °C. Above this temperature, a large amount of oxidation will occur. It is stable at 980°C in hydrogen and carbon dioxide atmosphere. The material is slowly dissolved in inorganic acid through grain boundary erosion and in strong alkali through erosion of aluminum nitride grains. The material is slowly hydrolyzed in water. Aluminum nitride is resistant to most molten salts, including chloride and cryolite. Aluminum nitride can be patterned using reactive ion etching based on Cl2.
Aluminum nitride is an inorganic powder of high thermal conductivity material. Because of its excellent comprehensive properties such as high thermal conductivity, good insulation, low dielectric constant and expansion coefficient equivalent to Si material, it has attracted more and more attention. It is widely used in large-scale integrated circuits, high thermal conductivity substrates in electronic field, inorganic thermal conductivity fillers, high-performance structural ceramics and other fields.
With the advent of 5g era, all kinds of electronic devices are becoming more and more integrated, and the power is increasing. Higher requirements are put forward for its heat dissipation performance. For various packaging resins used in the electronic field, the best way for thermal conductive materials to improve their heat dissipation performance is to add inorganic insulating fillers with high thermal conductivity, and aluminum nitride is one of the best choices. Increasing the filling amount requires the powder to be dense spherical and the particle size range from tens of microns to hundreds of microns, so as to ensure the combination of large and small particles and achieve the purpose of high filling and good fluidity.
At present, the known preparation methods of spherical aluminum nitride powder are mainly carbothermal reduction method, direct nitriding method and in-situ nitriding method, but there are some defects in varying degrees, such as poor particle size distribution, insufficient sphericity, low density, loose and porous, which hinder its application in heat conducting materials.
Thermal spraying process: aluminum nitride powder can be thermally sprayed to form electrical insulation and thermal conductive coating. Chemical / physical vapor deposition (CVD/PVD): aluminum nitride coating is deposited by CVD or PVD to provide electrical insulation and thermal conductivity coating.
Powder metallurgy (P/M): aluminum powder is pressed into parts by hot pressing or cold pressing and sintering.
Application of spherical aluminum nitride AlN powder
Aluminum nitride is a kind of inorganic powder with high thermal conductivity. Because of its high thermal conductivity, good insulation, low dielectric constant, and silicon material has considerable expansion coefficient and excellent comprehensive properties, it has attracted more and more attention. It is widely used in the fields of large-scale integrated circuits, electronic substrates, high thermal conductivity, thermal conductivity inorganic fillers, high-performance structural ceramics and so on.
With the advent of 5g era, the integration of various electronic devices is higher and higher, and the functions are more and more powerful. In order to improve the heat dissipation performance of various packaging resins used in the electronic field, the best way is to add inorganic insulating fillers with high thermal conductivity to the materials. Aluminum nitride is one of the best choices. In order to increase the filling amount, the powder is required to be dense and spherical, and the particle size ranges from tens of microns to hundreds of microns, so as to ensure that the particle size and particle size of the composite can achieve high filling and good fluidity
Due to the piezoelectric properties of AlN, epitaxially grown thin film crystalline aluminum nitride is used for surface acoustic wave sensor (SAW) deposited on silicon wafer. One application is RF filter, which is widely used in mobile phones. It is called thin film bulk acoustic resonator (FBAR). This is a MEMS device that uses aluminum nitride sandwiched between two metal layers. AlN is also used to construct piezoelectric micromechanical ultrasonic transducers that emit and receive ultrasound and can be used for aerial ranging over a distance of up to one meter. The metallization method allows AlN to be used in electronic applications similar to alumina and beryllium oxide. As inorganic quasi one-dimensional nanotubes, AlN nanotubes and carbon nanotubes have been proposed to be used as chemical sensors for toxic gases. At present, a lot of research has been carried out on the development of light-emitting diodes working under ultraviolet light using gallium nitride based semiconductors. Using aluminum gallium nitride alloy, the wavelength as short as 250 nm has been realized. In 2006, low efficiency aln# led emission at 210 nm was reported.
Price of spherical aluminum nitride AlN powder
The price of spherical aluminum nitride AlN powder particles will change randomly with the production cost, transportation cost, international situation, exchange rate, market supply and demand and other factors ofspherical aluminum nitride AlN powder. Tanki new materials Co.,Ltd. aims to help industries and chemical wholesalers find high-quality and low-cost nano materials and chemicals by providing a full range of customized services. If you are looking for spherical aluminum nitride AlN powder, please feel free to send an inquiry to obtain the latest price of spherical aluminum nitride AlN powder.
Spherical aluminum nitride AlN powder supplier
As a global supplier of spherical aluminum nitride AlN powder, Tanki new materials Co.,Ltd. has rich experience in the performance, application and cost-effective manufacturing of advanced and engineering materials. The company has successfully developed a series of powder materials (molybdenum disilicide), lanthanum nitride (LAN powder, calcium silicide, iron boride), high-purity targets, functional ceramics and structural devices, and provided OEM services.
Chemical Composition of Aluminum Nitride AlN powder
The United States urges the U.N. Security Council to impose additional sanctions on North Korea in response to its latest ballistic missile launch, including a ban on tobacco and oil exports to North Korea and a blacklist of the Lazarus hacking group.
The United States circulated the draft to the 15 members of the Security Council this week. It was not immediately clear if or when a vote would take place. A resolution requires nine "yes" votes and no vetoes from Russia, China, France, Britain, or the United States.
Russia and China have already voiced opposition to tightening sanctions in response to Pyongyang's launch of an intercontinental ballistic missile last month -- the first since 2017.
U.S. and South Korean officials and analysts also say there are growing indications that North Korea may soon conduct its first nuclear weapons test since 2017, too.
The U.S. -drafted U.N. resolution would expand the ban on ballistic missile launches to include cruise missiles or "any other delivery system capable of delivering a nuclear weapon."
The deal would halve crude oil exports to North Korea to 2 million barrels a year and refined oil exports to 250,000 barrels a year. The resolution also seeks to ban North Korea's export of "fossil fuels, mineral oils, and their distilled Aluminum nitride (AlN) are estimated to be influenced by international political situation changes.