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Because the fracture toughness of carbide rotary file is not good, it is difficult to be used in some machining occasions (such as micro-deep hole drilling) that require high toughness of the tool.Whisker toughening and reinforcing technology is an effective way to solve this problem.
The energy of crack propagation can be absorbed by adding whiskers to the rotary file of cemented carbide.The toughening mechanism of whisker is as follows: (1) whisker pulling and toughening: when the whisker is pulled out from the matrix under the action of external load, part of the energy of external load is consumed due to interface friction, so as to achieve the purpose of toughening. The toughening effect is affected by the whisker and interface sliding resistance.There must be sufficient binding force between the whisker and the matrix interface to effectively transfer the external load to the whisker, but the binding force cannot be too large to maintain sufficient pulling length.(2) crack deflection toughening: when the elastic modulus at the crack tip is larger than the second phase of the matrix, the crack will deviate from the original direction and expand along the two-phase interface or the matrix.Because the non-plane fracture of the crack has a larger fracture surface than the plane fracture, it can absorb more external energy and play a toughening role.The addition of whiskers or particles with high elastic modulus to the matrix can cause crack deflection and toughening mechanism.(3) whisker bridging toughening: when the matrix is broken, the whisker can bear the external load and act as a bridge connecting the crack surface.Bridged whiskers can apply a force on the substrate to close cracks and consume the work of the external load, thus improving the toughness of the material.