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In high-end ceramics, semiconductors, and specialized coatings, material purity and particle size critically impact performance.

1、 The 'ace feature' of boron carbide: why is it irreplaceable? King of Hardness: The Mohs hardness is as high as 9.3, second only to diamond and cubic boron nitride, more than three times that of steel, but 70% lighter than traditional hard alloys, perfectly balancing strength and weight. Resistant to extreme environments: with a melting point of 2450 ° C, it can withstand high temperatures, strong acid and alkali corrosion, and even neutron radiation, making it an ideal material for nuclear reactor control rods. Energy absorption characteristics: As a bulletproof armor material (such as tanks and bulletproof vests), boron carbide can absorb kinetic energy impact, and its protective effect far exceeds that of steel.

Preparation method of boron carbide Solid state method: This method mainly uses high-temperature solid-state reaction to react boron source with carbon source at high temperature to generate boron carbide. This method is easy to operate, but requires higher temperatures and longer reaction times.

Why Silicon Carbide? Silicon Carbide is a synthetic material that combines silicon and carbon, resulting in a compound with extraordinary characteristics: Exceptional Hardness: SiC is one of the hardest materials on Earth, making it ideal for abrasive and wear-resistant applications. High Thermal Conductivity: Its ability to efficiently dissipate heat ensures optimal performance in high-temperature environments. Superior Chemical Resistance: SiC is highly resistant to corrosion, making it suitable for harsh chemical and industrial settings. Electrical Properties: With its wide bandgap, SiC is revolutionizing power electronics by enabling faster switching speeds and higher energy efficiency.

Technical advantages High strength and hardness: The hardness of silicon carbide ceramics is second only to diamond, with extremely high wear resistance and compressive strength, suitable for extreme working conditions. High temperature and corrosion resistance: It can work stably in high temperature environments above 1600 ° C and resist chemical corrosion such as acid and alkali, making it an ideal choice for high temperature and corrosive environments.

By utilizing the ultra-high hardness of B4C, various sandblasting nozzles can be made using it for the sandblasting heads of ship rust removal sandblasting machines, which has a lifespan several tens of times longer than using alumina sandblasting heads. The nozzle used for surface sandblasting treatment in aluminum products is also made of B4C, and its service life can reach more than one month. Generally speaking, superhard materials have good wear resistance, and B4C is also a good material for mechanical seal rings, which can be used for bearings, axles, high-pressure nozzles, etc.

During the research, it was found that the bulletproof mechanism of composite armor is that in the initial stage of projectile penetration, the penetration energy of the projectile is mainly borne by the ceramic panel. The ceramic dissipates energy through compression and shear damage, and the fiber backplate bulges and delaminates. The fiber deformation is not obvious, and the fiber elongation consumes energy.

Although traditional bulletproof ceramics have improved their bulletproof effect through certain toughening, they still have some drawbacks, such as increasing material toughness while sometimes reducing material strength. Moreover, traditional bulletproof ceramics are difficult to withstand continuous impacts, cannot be repaired after impact, are disposable, have high costs, low reliability, and do not have good structural designability.

At present, the main method for enhancing the toughness of boron carbide ceramics is to optimize the material composition, such as by increasing fiber/whisker toughening and second phase particle toughening. Second phase particle toughening is achieved by adding metal phases, transition metal borides, graphene, nanoparticles, rare earth compounds, etc., and changing the internal crystal structure of ceramics, such as controlling the microstructure of ceramics, reducing the particle size of grains, increasing the density of ceramics, and forming a layered structure of ceramics.

The research on enhancing the toughness and improving the density of silicon carbide ceramics has been our ongoing work. The main methods for enhancing the toughness of silicon carbide ceramics are to change the composition of the ceramic material, such as by increasing fiber/whisker toughening, second phase particle toughening, and changing the ceramic forming process to change the internal microstructure of the ceramic.

In the early days, armor plates were made of homogeneous armor, and most tanks and other armored vehicles were covered with steel plates. However, the density and weight of steel plate materials were high, and thick armor relatively reduced mobility. Therefore, in order to improve combat capabilities on the battlefield, after the end of World War II, specialized armor forms appeared by coating a layer of ceramic or depleted uranium on steel armor. Although the characteristics of ceramic materials were discovered early, their actual application for military purposes was not long.

1.Application of silicon carbide ceramic film in high-temperature flue gas purification Silicon carbide ceramic film has unique advantages in the field of high-temperature flue gas treatment due to its high temperature resistance, corrosion resistance, and thermal shock resistance. For particulate pollutants such as PM2.5, the dust removal mechanism of silicon carbide ceramic membrane is pore screening, interception, adsorption, etc. In addition, silicon carbide film has been widely used in high-temperature dust removal industries such as coal chemical, polycrystalline silicon, and steel.