【摘要】 通过放电等离子烧结技术,在1350℃下烧结制备TiCN-10WC-10Ni-14Mo-1VC并外加纳米ZrC粉的金属陶瓷,研究了ZrC纳米粉添加量（0²0%,质量分数）对TiCN金属陶瓷微观结构和力学性能的影响。X射线衍射分析表明,添加的ZrC纳米粉主要形成合金相、少量形成氧化物,没有探测到独立的Zr C晶体衍射峰。但是,扫描电镜却没有观察到热压烧结TiCN金属陶瓷类似的典型芯-环结构,这可能是由于放电等离子体烧结速度快、时间短;扫描电镜只能观察到一些白色或灰色的晶粒。当ZrC纳米粉添加量为2.5%时,所得TiCN金属陶瓷呈现出较高的硬度HV10、抗弯强度和断裂韧性,分别约为18800 MPa、810 MPa和4.4 MPa·m^1/2。更多还原

【Abstract】 TiCN-10WC-10Ni-14Mo-1VC cermets with different amounts of Zr C nano-powder（0²0wt%） through extra addition were fabricated by spark plasma sintering at 1350 °C for 8 min under a pressure of 30 MPa. The addition effect of Zr C nano-powder on the microstructure and mechanical properties of the obtained samples was investigated. X-ray diffraction analysis indicates that in all the samples no Zr C phase is identified in the detection limit, while ZrO₂ and（Ti,Zr）O₂ phases are identified with increasing amount of Zr C added. Scanning electron microscopy examination reveals that no core-ring structure appears, which is typically observed in hot-press sintered Ti CN cermets, due to the short dwelling time in the present spark plasma sintering; only some white and gray particles are observed. When the addition amount of Zr C nano-powder is 2.5wt%, the sample present a relatively high hardness HV10, flexural strength and fraction toughness of about 18800 MPa, 810 MPa, and 4.4 MPa·m^1/2, respectively.更多还原