Přehled karbidu boru
Boron carbide is an important special ceramic with many excellent properties. Poprvé byl objeven v r 1858, a jeho tvrdost je v přírodě na druhém místě za diamantem a kubickým nitridem boru.
Zejména, téměř konstantní tvrdost při vysokých teplotách (>30GPa) je nesrovnatelná s jinými materiály, takže se stal důležitým členem rodiny supertvrdých materiálů.
Je to důležitý strukturální keramický materiál odolný proti opotřebení a vysoké tvrdosti mezi novou keramikou a je široce používán v civilním průmyslu, aerospace and military fields.
The world’s boron resources are mainly distributed in Turkey, the United States, Russia, Chile, Kazakhstan and China.
vlastnosti
The preparation includes hot pressing sintering, pressureless sintering, spark plasma sintering, microwave sintering, activation sintering, hot isostatic pressing sintering, and liquid phase sintering.Different sintering methods have their advantages and disadvantages. Which method to use for sintering boron carbide ceramics depends on the specific situation.
For the cutting of Boron Carbide, as a high-hardness material, many manufacturers use diamond wire loop for cutting. The Boron Carbide cutting video is for reference：
https://www.youtube.com/watch?v=asw2d6Ys2TM
aplikace
1. Bulletproof armor field
B4C ceramic has the characteristics of light weight, ultra-high hardness and high elastic modulus, which is the best material for bulletproof vests, bulletproof helmets and bulletproof loading fields.
2.Wear-resistant technology
Using the high hardness of B4C to prepare various nozzles, mortars, grinding rods and similar grinding devices; boron carbide devices are used as pneumatic slide valves, hot extrusion dies, journal bearings for nuclear power plant cooling systems; used in ceramic gas turbines corrosion-resistant and wear-resistant parts.
3.Nuclear energy
In the reactor core assembly, the neutron absorbing material is an important functional element next to the fuel element, and boron carbide is an important neutron absorbing material.
4.Thermocouple
The thermocouple prepared by the thermoelectricity of B4C can be used for the measurement and control of high temperature.
