Due to poor fracture toughness of cemented carbide tool material, it is difficult to apply some of the tools toughness demanding machining situations (such as micro-deep hole drilling, etc.). An effective solution to this problem is to use a whisker toughening reinforcement technology.

       Add carbide whisker material can absorb the energy of the crack propagation energy absorption by the size of the matrix and whisker state binding determined. Whisker toughening mechanism is mainly as follows: ① pulled whisker toughening: When whisker pull out from the matrix under external load is applied, because the interface friction load energy consumed part of the outside world, so as to achieve the purpose of toughening its increase whisker toughening effect and interfacial sliding resistance by. There must be between whisker and matrix interface bonding force sufficient to enable the external load can be effectively transmitted to the whiskers, but the binding force can not too much, in order to maintain a sufficient length of pull. ② crack deflection toughening: When the crack tip encounters elastic modulus of the matrix in the second phase, the crack will deviate from the original direction of advance along the two-phase interface or within the matrix expansion. Due to the non-planar fracture crack than the fracture plane it has a larger fracture surface, so you can absorb more external energy, and thus play a toughening effect. Join a high elastic modulus of whiskers or particles within the matrix can be caused by crack deflection toughening mechanisms. ③ whisker bridging toughening: When the matrix fracture, whiskers can withstand external load and between the crack faces off a bridge connecting role. Bridging whiskers can make produce stromal crack closure force loads acting outside consumption, thereby improving toughness.