High-temperature reactions of tungsten carbide-cobalt tool material with MDF

Experiments with tungsten carbide (WC) blanks containing 6 percent cobalt rubbed on a rotating medium density fiberboard (MDF) disk were undertaken to provide additional information on tool wear mechanisms for machining dry wood and wood products such as MDF. The chemical degradation of the WC-cobalt tools is at least a two-stage process when machining MDF. At relatively low temperatures, MDF decomposes to release sulfur-containing vapors and liquids that react with the cobalt binder. At higher tool temperatures, both the cobalt binder and the WC grains are oxidized in air. Sulfidation and oxidation are evident as high-temperature corrosion/oxidation tool wear mechanisms when WC is in contact with MDF at high temperatures.

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