The effect of 10% Si （mole fraction） addition on TiAlSiN coatings was studied. Ti0.5Al0.5N, Ti0.5Al0.4Si0.1N and Ti0.55Al0.35Si0.1N coatings were deposited on WC？Co substrates by cathodic arc evaporation. The mi...The effect of 10% Si （mole fraction） addition on TiAlSiN coatings was studied. Ti0.5Al0.5N, Ti0.5Al0.4Si0.1N and Ti0.55Al0.35Si0.1N coatings were deposited on WC？Co substrates by cathodic arc evaporation. The microstructure and mechanical properties were characterized by X-ray diffraction （XRD）, X-ray photoelectron spectroscopy （XPS）, scanning electron microscopy （SEM）, nano-indentation measurement and scratch test. The mechanisms of how Si affects the properties and failure modes of TiAlSiN coatings were also discussed. The results show that the addition of 10% Si results in the formation of nc-（Ti,Al,Si）N/a-Si3N4 nano-composite structure. The hardness and toughness of TiAlSiN coatings increase, whereas the coating adhesion strength decreases. Compared with Ti0.55Al0.35Si0.1N coating, Ti0.5Al0.4Si0.1N coating has higher hardness but lower toughness. The dominant failure mode of TiAlN coating is wedging spallation due to low toughness and strong interfacial adhesion. The dominant failure mode of TiAlSiN coatings is buckling spallation due to improved toughness and weakened interfacial adhesion.展开更多
采用阴极电弧蒸镀在WC-Co硬质合金基体上沉积Ti_(0.45)Al_(0.55N)、Ti_(0.35)Al_(0.55)Si_(0.1)N和Ti_(0.3)Al_(0.55)Cr_(0.15)N涂层,并在900℃下对涂层试样真空退火30 min和120 min。采用X射线衍射仪和显微维氏硬度计分析比较退火前后...采用阴极电弧蒸镀在WC-Co硬质合金基体上沉积Ti_(0.45)Al_(0.55N)、Ti_(0.35)Al_(0.55)Si_(0.1)N和Ti_(0.3)Al_(0.55)Cr_(0.15)N涂层,并在900℃下对涂层试样真空退火30 min和120 min。采用X射线衍射仪和显微维氏硬度计分析比较退火前后涂层的物相及硬度,研究Si、Cr的加入对Ti Al N涂层热稳定性能的影响。结果表明:在Ti Al N涂层中加入Si、Cr后涂层的硬度增加。900℃退火后,Ti_(0.45)Al_(0.55)N涂层的硬度逐渐下降,Ti_(0.35)Al_(0.55)Si_(0.1)N和Ti_(0.3)Al_(0.55)Cr_(0.15)N涂层的硬度则呈上升趋势,并且Ti_(0.3)Al_(0.55)Cr_(0.15)N涂层的硬度始终保持最高,而Ti_(0.45)Al_(0.55)N涂层的硬度最低。Si、Cr的加入能推迟涂层退火过程中软质的密排六方Al N相的形成,Cr还能延缓面心立方(TiAl)N相的调幅分解。Si、Cr的加入有效改善TiAlN涂层的热稳定性能,Ti_(0.3)Al_(0.55)Cr_(0.15)N涂层的热稳定性优于Ti_(0.35)Al_(0.55)Si_(0.1)N。展开更多
文摘The effect of 10% Si （mole fraction） addition on TiAlSiN coatings was studied. Ti0.5Al0.5N, Ti0.5Al0.4Si0.1N and Ti0.55Al0.35Si0.1N coatings were deposited on WC？Co substrates by cathodic arc evaporation. The microstructure and mechanical properties were characterized by X-ray diffraction （XRD）, X-ray photoelectron spectroscopy （XPS）, scanning electron microscopy （SEM）, nano-indentation measurement and scratch test. The mechanisms of how Si affects the properties and failure modes of TiAlSiN coatings were also discussed. The results show that the addition of 10% Si results in the formation of nc-（Ti,Al,Si）N/a-Si3N4 nano-composite structure. The hardness and toughness of TiAlSiN coatings increase, whereas the coating adhesion strength decreases. Compared with Ti0.55Al0.35Si0.1N coating, Ti0.5Al0.4Si0.1N coating has higher hardness but lower toughness. The dominant failure mode of TiAlN coating is wedging spallation due to low toughness and strong interfacial adhesion. The dominant failure mode of TiAlSiN coatings is buckling spallation due to improved toughness and weakened interfacial adhesion.
文摘采用阴极电弧蒸镀在WC-Co硬质合金基体上沉积Ti_(0.45)Al_(0.55N)、Ti_(0.35)Al_(0.55)Si_(0.1)N和Ti_(0.3)Al_(0.55)Cr_(0.15)N涂层,并在900℃下对涂层试样真空退火30 min和120 min。采用X射线衍射仪和显微维氏硬度计分析比较退火前后涂层的物相及硬度,研究Si、Cr的加入对Ti Al N涂层热稳定性能的影响。结果表明:在Ti Al N涂层中加入Si、Cr后涂层的硬度增加。900℃退火后,Ti_(0.45)Al_(0.55)N涂层的硬度逐渐下降,Ti_(0.35)Al_(0.55)Si_(0.1)N和Ti_(0.3)Al_(0.55)Cr_(0.15)N涂层的硬度则呈上升趋势,并且Ti_(0.3)Al_(0.55)Cr_(0.15)N涂层的硬度始终保持最高,而Ti_(0.45)Al_(0.55)N涂层的硬度最低。Si、Cr的加入能推迟涂层退火过程中软质的密排六方Al N相的形成,Cr还能延缓面心立方(TiAl)N相的调幅分解。Si、Cr的加入有效改善TiAlN涂层的热稳定性能,Ti_(0.3)Al_(0.55)Cr_(0.15)N涂层的热稳定性优于Ti_(0.35)Al_(0.55)Si_(0.1)N。
