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首页> 外文期刊>Applied Surface Science >Characterization of sp~3 carbon produced by plasma deposition on gamma-TiAl alloys
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Characterization of sp~3 carbon produced by plasma deposition on gamma-TiAl alloys

机译：在γ-TiAl合金上等离子沉积产生的sp〜3碳的表征

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摘要

Surfaces of two gamma-TiAl alloys, Ti-47%Al-2%Nb-2%Cr (MJ12) and Ti-47%Al-2%Nb-2%Mn + 0.8%TiB_2 (MJ47), were modified by acetylene plasma deposition at -3 kV bias voltage for 0.5-4 h. By using GIXRD and SAED, C (n-diamond), TiC, Al, AITi, AlTi_2, AlTi_3) Al_(0.64)Ti_(0.36) and Al_2Ti were detected on both alloys. Additional TiB_2 was detected on MJ47. XPS and Raman analyses revealed the presence of sp~3 and sp~2 carbon deposited on the alloy surfaces with their binding energies of 283.9-284.8 eV for MJ12 and 283.9-285.0 eV for MJ47. Both sp~3 and sp~2 contents were increased with the increase in the exposure times. The increasing rate of the first was less than that of the second, due to the stress developed in the films. Moire fringe and crystallographic planes were detected using TEM. Knoop hardness of the deposited alloys, influenced by sp~3 carbon, was increased with the increase in the exposure time. Those of MJ12 and MJ47 with 4 h deposition are 1.88 and 1.57 times of the corresponding untreated alloys, respectively.
机译：用乙炔对Ti-47％Al-2％Nb-2％Cr（MJ12）和Ti-47％Al-2％Nb-2％Mn + 0.8％TiB_2（MJ47）两种γ-TiAl合金的表面进行了乙炔改性。在-3 kV偏压下进行等离子沉积0.5-4 h。通过使用GIXRD和SAED，在两种合金上均检测到C（正菱形），TiC，Al，AlTi，AlTi_2，AlTi_3，Al_（0.64）Ti_（0.36）和Al_2Ti。在MJ47上检测到其他TiB_2。 XPS和Raman分析表明，在合金表面上存在sp〜3和sp〜2碳沉积，其结合能对MJ12为283.9-284.8 eV，对MJ47为283.9-285.0 eV。随着曝光时间的增加，sp〜3和sp〜2的含量均增加。由于膜中产生的应力，第一种的增加速率小于第二种的增加速率。使用TEM检测莫尔条纹和晶体学平面。受sp〜3碳影响，合金的努氏硬度随暴露时间的增加而增加。沉积4 h的MJ12和MJ47的金属分别是相应未处理合金的1.88和1.57倍。

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