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Tungsten Carbide Powder – Preparation and Application |

Tungsten carbide

A compound made of tungsten, carbon and has a molecular structure of WC. The molecular weight is 195.85. Tungsten carbid is a black hexagonal crystal, with a metallic luster similar to that of diamond. It conducts electricity well. Tungsten carbide can’t be dissolve in water or hydrochloric, nor in sulfuric, but is easily soluble when mixed with nitric and hydrofluoric acids. Tungsten carbide in its pure form is very fragile. However, a tiny amount of titanium or cobalt can reduce the fragility.

Tungsten Carbide

Utilizing metal tungsten or carbon as raw material, tungsten powder of an average particle size between 3 and 5 mm, and carbon black with the same quantity, are dried mixed and press molded. Then it is placed into a graphite resist furnace. Or, you can heat it to 14001700 using an induction electric furnace. Preferably 15501650. W2C is produced in the hydrogen stream. The reaction continues at high temperatures to create WC. To make tungsten carbide, first tungstenhexacarbonyl must be thermally broken down in a CO atmosphere between 650 to 1000 degC. W2C is possible at higher temperatures than these.

Hydrogenated tungsten oxide WO3 can be reduced and made into tungsten powder with an average particle size of 35mm. Next, the mixture (containing tungsten powder and carbon) in an equal ratio is dried-blended using a ballmill for approximately 10 hours. The mixture is then press-formed under pressure of around 1t/cm2. Place the block of pressurized material in a graphite pan/crucible and heat to 1400 1700, or 1550 -1650 if using pure hydrogen.

Since W2C can be generated from the beginning of the reactions, the reaction begins around the tungsten particle. Because the reaction is not complete (mainly due the low temperature reaction), only unreacted and intermediate W2C are left. The reaction must then be heated to the high temperatures mentioned above. The raw tungsten particle size should determine the maximum temperature. A reaction can be initiated at temperatures between 1550-1650degC for large particles that have an average size of 150 mm.

Tungsten Carbide

Tungsten caride is used extensively in high-speed, fast cutting tools, furnace structural material, jet engine components, cermet materials and resistance heating element.

Tungsten carbid is used in the manufacture of cutting tools and wear-resistant parts. It also melts crucibles for various metals, such as cobalt, copper and bismuth.

Tungsten carbide is used for super-hard material as well as wear resistance. This can be combined with many other carbides to create a stable solution. WC-TiC-Co-cemented carbide tools are well-known. You may also use it to modify NbC/C and TaC/C ternary-system carbides. It will reduce the sintering temp and provide excellent performance. It is also suitable for aerospace applications.

Tungsten carbide (WC) is made by combining tungsten anhydride, (WO3), and graphite at 1400-1600 degrees Celsius in a reducing environment. You can make dense ceramic products by either hot pressing or hot isostatically pressing sintering.

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