Is chromium diboride a stable material?
About chromium diboride CrB2 powder
How is chromium diboride CrB2 powder produced?
The chemical formula of chromium diboride is CrB2, which is one of the six stable chromium diborides, with a melting point of 1760°C, good oxidation resistance, and high-temperature strength. Boron forms a double compound with metals and some non-metals (such as carbon). The usual formula MMBN is usually used, which is usually a complex compound and does not follow the pricing rules. In addition to zinc (Zn), cadmium (Cd), mercury (Hg), gallium (Ga), indium (In), β (T1). , Germanium (Ge), tin (Sn), lead (Pb), bismuth (Bi) and other metals can form boron. They are all crystals with high hardness and melting point, and are chemically stable. Concentrated nitric acid is insoluble and can be directly mixed with elements, or it can be made by reducing oxides with active metals, and used for fire, grinding and superconducting materials.
Chromium is heated at 1600°C in a vacuum or inert atmosphere, or sintered at 1150°C for 48 to 72 h, then chromium boride CrB, Cr2b, Cr3b2, Cr3B4, CrB2, and hot pressing at high temperature, CrB2 can be formed. , CrB or Cr3B4.
Application of chromium diboride CrB2 powder
1. Chromium boride can be used as a refractory material. Due to the high melting point of chromium diboride, it is very hard and has high corrosion resistance.
2. Chromium diboride is used as a metallurgical additive.
3. Chromium diboride is used as a sputtering target for preparing thin films.
4. Chromium diboride can be a wear-resistant semiconductor film.
Chromium diboride CrB2 powder: Moist agglomeration affects the dispersion performance and use effect of CrB2 powder. Therefore, chromium diboride CrB2 powder should be sealed in a vacuum package and stored in a cool and dry room. Chromium diboride CrB2 powder cannot Exposure to the air. In addition, the use of CrB2
powder under stress should be avoided.
Properties and uses of borides
Boride has the characteristics of high conductivity, high melting point, high hardness and high stability: Boride has relatively high thermal conductivity and strength, so its thermal stability is relatively good. The oxidation resistance of boride at high temperature is based on group IVB metals. Boride is the best.
Borides are soluble in molten alkali, rare earth and alkaline earth metal borides are not corroded by humid air or dilute hydrochloric acid, but are soluble in nitric acid. Almost all borides have the appearance and properties of metals, with high conductivity and positive temperature coefficient of resistance. The borides of Ti, Zr, and Hf have better conductivity than their metals.
The creep resistance of boride is very good, which is very important for gas turbines and rockets that require materials to work at high temperatures for a long time, and can maintain strength, resist deformation, resist corrosion, and heat shock. Various alloys or cermets based on borides, carbides, and nitrides can be used to manufacture rocket structural components, aviation equipment components, turbine components, sample holders for high-temperature material testing machines and instrument components, bearings, and measuring high temperature Cone head for hardness and some structural parts of nuclear energy device, etc.
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