Preparation of chromium carbide

Release time:

2021-12-22 15:05

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Chromium carbide has excellent properties such as strong chemical stability, high room temperature hardness and thermal hardness, good acid and alkali corrosion resistance, good wear resistance, high melting point, good wettability with, and other metals. In the metal type carbide, the oxidation resistance is high, and the oxidation temperature is high. The use of chromium carbide can effectively control the growth of cemented carbide grains, the following together to understand the preparation of chromium carbide!

In addition, chromium carbide is an additive for explosive materials with excellent wear resistance, and is also a metal ceramic raw material. It can also be used as a spray powder. For example, the spray powder has good corrosion resistance, oxidation resistance and wear resistance at high temperatures. Because of its excellent characteristics, chromium carbide is widely used in metallurgical industry, electronic industry, high temperature resistant coating, aerospace and other fields.

Chromium carbide has high hardness, high melting point, high elastic modulus, chemical resistance, wear resistance and other excellent properties, has become one of the widely used metal carbides. In the field of cutting tools, chromium carbide is usually used as a surface coating plays an important role in the Fe-Cr-C alloy, chromium carbide as an important precipitation phase, the material has excellent wear resistance.

Jiangyuan studied the structure, elastic and electronic properties of 6 kinds of chromium carbides (including 3 kinds of metastable chromium carbides), and predicted their elastic modulus. However, chromium carbide is a very important wear-resistant phase, and hardness is an important mechanical parameter in the design of wear-resistant materials, but no more accurate results have been obtained.

Use

Used in the manufacture of wear-resistant films and semiconductor films.

laboratory method

In the metal chromium powder carbonization method, carbon black is dry-mixed with a 325-purpose metal chromium powder pulverized with electrolytic chromium in a ball mill at a ratio of 13.5 to 64% by mass higher than the theoretical bound carbon amount of 11.33% I column, and then used as a raw material. Adding 1% ~ 3% stearic acid as forming lubricant, press forming at a pressure above 1 T/era2. The pressurized molding powder is put into a graphite dish or crucible, heated to 1500~1700 in a hydrogen stream (hydrogen dew point (I) about 35) by a turbine furnace or an induction heating furnace, and maintained for l h to carbonize chromium to generate chromium carbide, which is cooled to obtain chromium carbide. Its reaction is as follows

Packaging and storage

Packed in glass bottles, each bottle has a net weight of 0.5kg or 1kg, concentrated on the buffer material in the wooden box. Store in a dark, ventilated, dry warehouse, airtight preservation. It shall not be stored and transported together with inorganic acids, alkalis and combustibles. Please handle it lightly to prevent damage to the container.

Manufacturing method

Generally, CrzC2 powder is produced by mixing chromium oxide powder and carbon powder, and then carbonizing at high temperature. At present, in the preparation of chromium carbide, people have studied many methods:

American enterprises obtained Cr3C2 powder by high-energy ball milling chromium powder and graphite powder in argon protective atmosphere, temperature 800C and carbonization for 2h. In the patent CN1176224A in 1996, Wang Zhaoquan and others successfully produced Cr3C2 powder with carbon content over 12% and carbonization rate over 99% by mixing Cr2O3 as chromium source and C as reducing agent according to a certain technical route. The method is simple, but the original powder particle size is coarse, which is not conducive to the carbonization reaction. In addition, the carbonization temperature is also very high, and the energy consumption is also very large. In addition, the product particle size does not meet the requirements, can not get a good restraint effect, can not meet the application in industry.

The above introduction is the preparation of chromium carbide, if you need to know more, please feel free to contact us!