Failure Modes of Tungsten Carbide CuttersⅡ

In part 1 we know that tungsten carbide cutters fail in many different modes such as abrasive/erosion wear mode, which means a form of mechanical attack at the working surface of the carbide component and meanwhile not resulting in a total breakdown or stoppage of the operation dependent on the failing component. In this part we will talk about corrosion/leaching wear which is one of the most common failure modes of tungsten carbide cutters.

2. Corrosion/Leaching Wear

Corrosion wear is the result of a chemical or electrochemical reaction between tungsten carbide cutter surfaces and the environment. These reactions generally involve the metallic binder matrix (cobalt or nickel) rather than the tungsten carbide grains and, with the loss of the binder metal at exposed surfaces, the mechanical bond holding the carbide grains in place is also lost. Acidic liquids are particularly corrosive. A cobalt binder is far more susceptible to chemical attack or “leaching” than nickel and should be avoided in moderate to highly corrosive environments. Corrosion rate data for specific situations are seldom available and are typically determined empirically.

(To be continued. This article is divided into 9 parts and this is part 2, for part 1 please refer to http://news.chinatungsten.com/en/tungsten-information/79302-ti-10133; for part 3 please refer tohttp://news.chinatungsten.com/en/tungsten-information/79331-ti-10139)

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