Dry goods sharing, one minute to take you to understand chromium carbide
Release time:
2023-01-11 09:32
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Chromium carbide (Chromium carbide) is an inorganic compound with a molecular formula of Cr3C2 and a molecular weight of 180.01. Gray powder, orthorhombic system, a = 2.821, B = 5.52, c = 11.46. The melting point is 1890°C and the boiling point is 3800°C. The micro-Vickers hardness (load 50g) is 2700kg/rnrn2, and the thermal expansion coefficient is 10.3 × 10-6/K.
Chromium carbide in particular has many excellent properties, such as strong chemical stability, room temperature and high thermal hardness, acid and alkali corrosion resistance, good wear resistance, high melting point, and metal wettability. In the metal carbide, the oxidation resistance is high, and the oxidation temperature is also high. When chromium carbide is used as an inhibitor, the grain growth of cemented carbide is effectively controlled.
Moreover, chromium carbide is not only an additive for sandblasting materials, with good wear resistance, but also a metal ceramic raw material, and can also be used as powder spraying. Anti-oxidation and abrasion resistance. Because of its excellent performance, chromium carbide has been widely used in metallurgical industry, electronic industry, high temperature resistant coatings, aerospace and other fields.
Chromium carbide has the characteristics of high elastic modulus, high hardness, high melting point, chemical corrosion resistance and wear resistance, and has become one of the most widely used metal carbides in the market. In the field of machining tools, chromium carbide as a surface coating knife layer, which plays an important role, can be used to extend the life of props, protect the blade from gaps and faults. Alloyed chromium carbide, as an important precipitate, imparts excellent wear resistance to the new material powder.
The structural, elastic and electronic properties of six chromium carbides (including three metastable chromium carbides), and the elastic modulus of chromium carbides are predicted. Chromium carbide is a very important wear-resistant phase, hardness as an important physical parameter in the design of wear-resistant materials, has not been more accurate results.
Physical properties of gray powder, orthorhombic crystal system, relative density 6.68. Melting point 1890 ℃. Boiling point 3800 ℃. Micro Vickers hardness (load 50g)2700 K HEE/rnm2, thermal expansion coefficient 10.3 × 10-6/K. Chromium carbide (Cr3 island) has a low melting point of 1710. Normal temperature and hot hardness, good wettability with Co, Ni and other metals, high oxidation resistance in metal carbides. Excellent oxidation resistance and corrosion resistance. It is a kind of material with excellent high temperature oxidation resistance, friction and wear resistance and gas erosion resistance. Mainly used for high temperature resistant coating, but direct spraying chromium carbide coating adhesion is poor. Therefore, it is mainly used as a main raw material component for preparing the NiCr-Cr3 island composite powder.
Used in the production of anti-wear films and semiconductor films. Metal chromium powder carbonization method% (mass) ratio (11.33 ipi more than the theoretical combined carbon content) and 325 mesh metal chromium powder are crushed by electrolytic chromium and dry mixed as raw materials with a ball mill. Add stearic acid from 1% to 3% as a forming lubricant. The press molding is performed at a pressure of 1T/era2 or more. Put the pressurized powder into a graphite plate or crucible, use a Taman furnace or an induction heating furnace, heat to 1500-1700°C in a hydrogen stream (the dew point of hydrogen is about 135°C), and keep it for 1 hour to carbonize chromium to generate chromium carbide, and cool to obtain chromium carbide.
Chromium carbide
Company address: 412007, No. 86, Tomorrow Road, Liyu Industrial Park, Tianyuan District, Zhuzhou City, Hunan Province
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