High pressure sintering behavior and mechanical properties of cBN-Ti₃Al and cBN-Ti₃Al-Al composite materials

摘要

The sintering behavior and mechanical properties of cubic boron nitride (cBN) composites, using the mixture of cBN-Ti₃Al and cBN-Ti₃Al-Al as the starting material respectively, were investigated under high pressure and high temperature (HPHT) conditions. The results show that the samples of cBN-Ti₃Al-Al sintering system have more homogeneous microstructures. Young's modulus, shear modulus, and bulk modulus of samples measured by ultrasonic measurements can reach to 782±3 GPa, 344±1 GPa, and 348±2 GPa, respectively. The hardness increases remarkably with the sintering temperature rising, and reaches to the highest value of 35.04±0.51 GPa. For the cBN-Ti₃Al sintering system, the X-ray diffraction patterns of composites reveal that the chemical reactions between cBN and Ti₃Al occurred at 5.0 GPa and 1300°C. The reaction mechanisms of both cBN-Ti₃Al and cBN-Ti₃Al-Al sintering systems are discussed in this paper.View full textDownload full textKeywordscubic boron nitride (cBN), high pressure high temperature (HPHT) sintering, hardness, microstructure, elasticity modulusRelated var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; Add to shortlist Link Permalink http://dx.doi.org/10.1080/08957959.2012.736507