用粉末冶金法制备不同 Ti C颗粒含量的 Ti C/ Ni Cr金属陶瓷复合材料 ,讨论了它们的显微组织特点 ,研究了该复合材料在水润滑条件下的摩擦磨损性能 .试验结果表明 :随着 Ti C颗粒含量增加 ,金属陶瓷的耐磨性能明显提高 ;在本试验条件下 ...用粉末冶金法制备不同 Ti C颗粒含量的 Ti C/ Ni Cr金属陶瓷复合材料 ,讨论了它们的显微组织特点 ,研究了该复合材料在水润滑条件下的摩擦磨损性能 .试验结果表明 :随着 Ti C颗粒含量增加 ,金属陶瓷的耐磨性能明显提高 ;在本试验条件下 ,当 Ti C颗粒体积分数为 6 7%左右时 ,Ti C/ Ni Cr金属陶瓷复合材料的耐磨性能最佳 ;其磨损失效机制主要是在磨损过程中 Ti C颗粒以显微脆断方式剥落产生磨损 。展开更多
The effects of vanadium(V)on the microstructures and mechanical properties of the TiC cermet fusion welding interface were studied by adjusting the content of V in the self-developed flux-cored wires using metal inert...The effects of vanadium(V)on the microstructures and mechanical properties of the TiC cermet fusion welding interface were studied by adjusting the content of V in the self-developed flux-cored wires using metal inert gas arc(MIG)welding for surfacing on the TiC cermet.The results show that the increase in V content promotes the element diffusion between TiC cermet and weld metal.There are no de-fects observed in the interface,and the diffusion of elements refers to excellent metallurgical bonding.The shear strength of the fusion zone initially decreases and then increases with the increase in V content.The maximum shear strength of the TiC cermet/weld interface,reaching 552 MPa,occurred when the V content reached 0.65%.Meanwhile,the average hardness in the transition zone reached 488.2 HV0.2.展开更多
An experimental investigation were performed on the effect of the impulse electron-beam irradiation upon microstruc-ture of the surface layer and on wear resistance of a cutting tool for sintered TiC/NiCr cermet. The ...An experimental investigation were performed on the effect of the impulse electron-beam irradiation upon microstruc-ture of the surface layer and on wear resistance of a cutting tool for sintered TiC/NiCr cermet. The results showed that the surface electron-beam treatment of the TiC/NiCr cermet is an efficient method for investigating the mi-crostructure and phase composition in the surface layer of the powder composite and there are optimal regimes of electron-beam treatment, which ensure a substantial increase in the resistance of the cermet to wear during cutting of metals.展开更多
The brazing of TiC cermet to iron was carried out at 1223K for 5-20min using Ag-Cu-Zn filler metal. The formation phase and interface structure of the joints were investigated by electron probe microanalysis (EPMA), s...The brazing of TiC cermet to iron was carried out at 1223K for 5-20min using Ag-Cu-Zn filler metal. The formation phase and interface structure of the joints were investigated by electron probe microanalysis (EPMA), scanning electron microscopy (SEM) and X-ray diffraction (XRD), and the joint strength was tested by shearing method. The results showed: there occurred three new formation phases, Cu(s.s), FeNi and Ag(s.s) in TiC cermet/iron joint. The interface structure was expressed as TiC cermet/Cu(s.s)+FeNi/Ag(s.s)+a little Cu(s.s)+a little FeNi/Cu(s.s)+FeNi/iron, With brazing time increasing, there appeared highest shear strength of the joints, the value of which was up to 252.2MPa when brazing time was 10min.展开更多
Stress concentration zones and the maximum value of thermal stress of TiC cermet/iron joint brazed with Ag-Cu-Zn filler metal during cooling were studied. The results show that when the temperature is 300K, the maxi...Stress concentration zones and the maximum value of thermal stress of TiC cermet/iron joint brazed with Ag-Cu-Zn filler metal during cooling were studied. The results show that when the temperature is 300K, the maximum values of shear stress and tensile stress on TiC cermet/iron interface both appear on the tip of Ag-Cu-Zn/iron interface, which makes Ag-Cu-Zn/iron interface become weak zone of the interface. Tensile stress on iron undersurface relaxes to the inner of iron, and the compression stress on iron undersurface concentrates on the side of iron as the temperature decreases, so cracks appear easily at the site where tensile and compression stress cross.展开更多
用 DTA方法研究了 Ti C/ Ni Cr Mo Al Ti金属陶瓷复合材料体系烧结过程 ,结果表明 :温度升高到 5 90～ 6 6 5℃ ,Al与 Ni发生反应 ,生成 Ni Al3,Ni2 Al3,Ni Al和 Ni3Al,继续升温到体系出现液相时 ,除 Ni Al外的其它产物均以[Al]和 [Ni]...用 DTA方法研究了 Ti C/ Ni Cr Mo Al Ti金属陶瓷复合材料体系烧结过程 ,结果表明 :温度升高到 5 90～ 6 6 5℃ ,Al与 Ni发生反应 ,生成 Ni Al3,Ni2 Al3,Ni Al和 Ni3Al,继续升温到体系出现液相时 ,除 Ni Al外的其它产物均以[Al]和 [Ni]形式溶于液相中 ,在随后冷却阶段 ,在粘结相基体中沉淀析出金属间化合物 Ni3Al。该金属陶瓷体系真空烧结液相出现温度约为 1330℃。展开更多
文摘用粉末冶金法制备不同 Ti C颗粒含量的 Ti C/ Ni Cr金属陶瓷复合材料 ,讨论了它们的显微组织特点 ,研究了该复合材料在水润滑条件下的摩擦磨损性能 .试验结果表明 :随着 Ti C颗粒含量增加 ,金属陶瓷的耐磨性能明显提高 ;在本试验条件下 ,当 Ti C颗粒体积分数为 6 7%左右时 ,Ti C/ Ni Cr金属陶瓷复合材料的耐磨性能最佳 ;其磨损失效机制主要是在磨损过程中 Ti C颗粒以显微脆断方式剥落产生磨损 。
基金supported by Henan Province Key Research and Development and Promotion Project(Grant No.201ZP20220010).
文摘The effects of vanadium(V)on the microstructures and mechanical properties of the TiC cermet fusion welding interface were studied by adjusting the content of V in the self-developed flux-cored wires using metal inert gas arc(MIG)welding for surfacing on the TiC cermet.The results show that the increase in V content promotes the element diffusion between TiC cermet and weld metal.There are no de-fects observed in the interface,and the diffusion of elements refers to excellent metallurgical bonding.The shear strength of the fusion zone initially decreases and then increases with the increase in V content.The maximum shear strength of the TiC cermet/weld interface,reaching 552 MPa,occurred when the V content reached 0.65%.Meanwhile,the average hardness in the transition zone reached 488.2 HV0.2.
文摘An experimental investigation were performed on the effect of the impulse electron-beam irradiation upon microstruc-ture of the surface layer and on wear resistance of a cutting tool for sintered TiC/NiCr cermet. The results showed that the surface electron-beam treatment of the TiC/NiCr cermet is an efficient method for investigating the mi-crostructure and phase composition in the surface layer of the powder composite and there are optimal regimes of electron-beam treatment, which ensure a substantial increase in the resistance of the cermet to wear during cutting of metals.
基金sponsored by National Natural Science Foundation (No.50175021)National Key Laboratory of Advanced Welding Production Technology of Harbin Institute of Technology,China.
文摘The brazing of TiC cermet to iron was carried out at 1223K for 5-20min using Ag-Cu-Zn filler metal. The formation phase and interface structure of the joints were investigated by electron probe microanalysis (EPMA), scanning electron microscopy (SEM) and X-ray diffraction (XRD), and the joint strength was tested by shearing method. The results showed: there occurred three new formation phases, Cu(s.s), FeNi and Ag(s.s) in TiC cermet/iron joint. The interface structure was expressed as TiC cermet/Cu(s.s)+FeNi/Ag(s.s)+a little Cu(s.s)+a little FeNi/Cu(s.s)+FeNi/iron, With brazing time increasing, there appeared highest shear strength of the joints, the value of which was up to 252.2MPa when brazing time was 10min.
文摘Stress concentration zones and the maximum value of thermal stress of TiC cermet/iron joint brazed with Ag-Cu-Zn filler metal during cooling were studied. The results show that when the temperature is 300K, the maximum values of shear stress and tensile stress on TiC cermet/iron interface both appear on the tip of Ag-Cu-Zn/iron interface, which makes Ag-Cu-Zn/iron interface become weak zone of the interface. Tensile stress on iron undersurface relaxes to the inner of iron, and the compression stress on iron undersurface concentrates on the side of iron as the temperature decreases, so cracks appear easily at the site where tensile and compression stress cross.
