Radar absorbing material specific surface area analysis and stealth technology - Database & Sql Blog Articles

In recent years, stealth technology has been applied in various military aircraft (aircraft, missiles), ships, and ground military facilities such as bridges and tanks, greatly improving the practical defense capacity and survival rate.
Stealth technology refers to the technology that reduces the detectability of a target in a certain remote sensing environment, making it difficult to be found in a certain wavelength range. In modern warfare, the acquisition and counter-acquisition of information has become the focus of war. The first enemy discovery and the first enemy attack are important guarantees for the enemy to win. As one of the three major military technological innovations in the contemporary era, stealth technology has become the most important and effective tactical technical measure for the three-dimensional integration of sea, land, air, sky and electromagnetic, and the most effective and effective tactical measures in modern warfare. An indispensable means of penetration, penetration and deep-strike capability.
As the core of stealth technology, radar absorbing materials have become the top priority of all countries and have been highly valued by the world's military powers. Therefore, actively exploring multi-functional and high-efficiency absorbing materials and stealing and destroying cutting-edge weapons and equipment has become an urgent problem that needs to be solved internationally. The rise and development of nanomaterials and nanotechnology have brought breakthroughs to radar absorbing materials, and have become one of the hotspots in the current stealth technology field. From the current situation of stealth technology development at home and abroad, "thin, wide, light and strong" is the development direction of stealth technology. Therefore, it is an inevitable trend to develop and develop nano-radar absorbing materials with wide frequency band, good compatibility, low cost and multi-function. In the case of absorbing materials, the stealth performance of a certain detecting means is good, and the stealth performance of another detecting means is not good. In order to solve this problem, a multifunctional absorbing material has been developed, that is, a material having a plurality of stealth functions at the same time. For example, a composite coating formed by using nanoparticles, such as metal or ferrite, can absorb and attenuate electromagnetic waves and sound waves, and has broad application prospects in the submarine field.
Commonly used radar absorbing materials are nano indium tin oxide (ITO), nano ferrite absorbing materials, metal micro powder absorbing materials, polycrystalline iron fiber absorbing materials and the like. For radar absorbing materials, the particle size is generally less than 100 nm, the specific surface area is greater than 15 m2/g, the particle morphology is spherical, the particle size distribution range is narrow, and the agglomeration is small.
The national standard for specific surface area analyzers is a low temperature nitrogen adsorption BET multipoint method based on the BET theory (GB/T 19587-2004). The main point of the specific surface area measured by the nitrogen adsorption BET multi-point method is: in the range of 5-30% nitrogen partial pressure, the adsorption amount of the adsorbent (the powder to be tested) to nitrogen is measured at different partial pressure points of nitrogen, and adsorption is made. The isotherm, the specific surface area of ​​the adsorbent can be calculated by the BET formula to determine the saturated adsorption amount of the monolayer when the surface of the adsorbent is covered with nitrogen molecules to cover the monolayer. The 3H-2000BET-A specific surface area analyzer of Bestech Instrument Technology (Beijing) Co., Ltd. is a high-precision analytical instrument based on the national specific surface area analysis standard. It has many domestic leading technologies; The purging process function requires a purge process between different nitrogen partial pressure points for chromatographic specific surface area analysis, which makes the purging process between different nitrogen partial pressure points more convenient and efficient, and reduces the accuracy of continuous testing. Impact; the only program-controlled wind-heat assisting device in China, which guarantees sharp and rapid desorption peak and reduces background error after full automation; the only chromatographic concentration detection system in China makes the nitrogen partial pressure detection accuracy increase relative to the flow method 10 times; six-way valve injector program control, the only domestic quantitative tube program-controlled switching function; the only domestic particle size report and other functions; the instrument parameter software display, at the same time, the large-screen LCD hardware display on the instrument, so that the instrument working state parameters At a glance, the operation is more reliable; and liquid nitrogen temperature monitoring, detector gas shutoff protection, detector thermostat The important part of the sound prompts, the 3H-2000BET-A specific surface area analyzer achieves and exceeds the performance of similar instruments in foreign countries in terms of test accuracy, stability and safety, and ease of operation. The 3H-2000 series specific surface area analyzer has a large number of domestic Customers, well-known brands for surface instruments.
A number of military academies and research institutes have purchased Besider's specific surface area analyzer, which has broken the monopoly of foreign instruments. Bethes's many performance indicators have surpassed foreign instruments and are excellent national brands. The model of the instrument has made positive contributions to China's national defense, military, science and technology, industrial production and other fields!