High-temperature halogenation of tungsten carbide-cobalt tool material when machining MDF

High-temperature corrosion\oxidation of the tungsten carbide-cobalt matrix C2 tool material (WC- 6%Co) has been shown to be a major cause of tool wear when machining medium density fiberboard (MDF). In addition to sulfidation and oxidation, the possibility of high-temperature corrosion by a halogen, specifically by chlorine (Cl), is discussed. The elemental analyses from thermogravimetric analyses (TGA) and wear tests showed that Cl was available as Cl-, C12, or HCl to react with C2 in gas phase reactions. The weight loss of C2 in TGA is characteristic of volatile corrosion products such as CoCl3 as a result of oxidation-chlorination of Co. Consequently, halogenation by chlorine may also contribute to tool wear when machining MDF.

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