Abstract
Due to the poor strength and toughness of cubic boron nitride tool, it is easy to have poor tool durability and chipping during machining. In order to solve this problem, carbon nanotubes (CNTs) reinforced cubic boron nitride (cBN) tool was fabricated by spark plasma sintering (SPS). The results show that the uniformly dispersed CNTs enhance the discharge property of the composite powders during SPS sintering, accelerate the material densification process, and improve the sintering effect of cBN. When the sintering temperature was 1475 °C, the fracture toughness and flexural strength of the tool with 0.50 wt% CNTs are 7.16 MPa·m1/2 and 635 MPa, respectively, which are 13.7 % and 75.4 % higher than that of the tool without CNTs. The improvement of mechanical properties of CNTs reinforced cBN tool materials was mainly due to the effect of CNTs drawing, bridging and grain refinement. In the cutting of 45 carbon steel, the effective cutting distance of the tool with 0.50 wt% CNTs was 16,000 m, which was 33.3 % higher than that of the tool without CNTs. The addition of CNTs can improve the abrasion resistance of the tool and machining quality of the workpiece.
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