Zirconium boride is a chemical substance and its molecular formula is ZrB2. Nature gray hard crystal. Zirconium boride has three components: zirconium monoboride, zirconium diboride, and zirconium triboride. Only zirconium diboride is stable in a wide temperature range. Industrial production is mainly based on zirconium diboride. Zirconium diboride is a hexagonal crystal, gray crystal or powder, with a relative density of 5.8 and a melting point of 3040°C. High temperature resistance, high strength at room temperature and high temperature. Good thermal shock resistance, low resistance, anti-oxidation at high temperature. The melting point is about 3000°C. With metallic luster.
The preparation of ZrB2 powder mainly uses zirconium or high oxide for boronization. The traditional synthesis method is to realize the oxide carbothermal reduction process in a high temperature induction furnace or resistance furnace. This method has a simple process, but generally the temperature is higher (about 1800°C), the purity of the synthetic powder is lower, and the average particle size is relatively large. , Poor sintering activity. Carbothermal reduction method, high-temperature self-propagation method, mechanical alloying method, ceramic precursor cracking method, liquid phase method, etc. are mostly used now.
Zirconium diboride ceramics are valued and applied in the fields of high-temperature structural ceramic materials, composite materials, refractory materials, electrode materials, and nuclear control materials because of their high melting point and hardness, good electrical and thermal conductivity, and strong neutron control ability. Such as: turbine blades and magnetic fluid power generation electrodes in the aviation industry. In addition, compared with many ceramic materials, it has better electrical conductivity and can be used to produce parts with complex shapes through wire cutting technology.
Refractory
ZrB2 ceramics are excellent special refractory materials, which can be used as high-temperature thermocouple protection sleeves, casting molds, metallurgical metal crucibles, etc. When used as thermocouple protection sleeves, they are not very airtight and conductive. Therefore, it must be matched with the alumina inner sleeve for effective temperature measurement. The thermowell of this material can be used continuously for a long time in molten iron and brass melt. ZrB2 ceramics can also be used as an antioxidant for refractory materials.
Because ZrB2 has a very low resistivity and the conductive mechanism is electronic conduction, it is suitable for electric shock materials and electrode materials, and can be used in metal thermocouple electrodes and high temperature heating elements. In 1994, researchers developed a sleeve-type thermocouple material paired with ZrB2 and graphite. Experiments have shown that it can work in an oxidizing atmosphere at 1200~1600°C. The value of the thermocouple is relatively large, reaching about 70mV at 1600°C. , The thermoelectric potential rate is higher. It can play a role in continuous temperature measurement in some special occasions where metal thermocouples and radiation thermometers are not suitable. It is a good thermocouple material.
TRUNNANO (aka. Luoyang Tongrun Nano Technology Co. Ltd.) is a trusted global chemical material supplier & manufacturer with over 12 years’ experience in providing super high quality chemicals and Nano materials. The zirconium diboride powder produced by our company has high purity, fine particle size and impurity content. Lower, please contact us if necessary.
