Zhaohua JIANG
,
Xuetong SUN
,
Yanping LI
,
Fuping WANG
,
Y
,
ong LÜ
材料科学技术（英文）
Ceramic coatings were prepared on Ti-6Al-4V alloy using ac micro-arc oxidation (MAO) in silicate-hypophosphate solution. Growth regularity and formation mechanism of ceramic coatings were discussed. It was found that during the first stage the growth rate of coatings toward the external surface was larger than that toward substrate and then the coating began to grow mainly towards Ti alloy. When the total coating thickness reaches a certain value, it would no longer increase. In addition, the variations of the composition and microstructure of ceramic coatings according to the depositing time were also investigated with X-ray diffraction (XRD) and scanning electron microscope (SEM). The amount of rutile TiO2 gradually increased, whereas the amounts of the anatase TiO2 and amorphous phases first increased and then decreased slightly.
关键词:
Titanium alloy
,
null
,
null
,
null
Xiaotao LIU
,
Jianzhong CUI
,
Yanhui GUO
,
Xiaoming WU
,
Jun ZHANG
材料科学技术（英文）
The influence of an alternative magnetic field on the growth of the diffusion of Al and Mg in Al-Mg diffusion couple is studied. The diffusion zone is composed of two intermediate phases, namely β and γ phase. Thickness of each intermediate phase is examined. The results show that the alternative magnetic field increase the thicknesses of β and γ phase zone and the layer growth of β and γ phase obeys the parabolic rate law. The growth rate of the β and γ phase are increased with the application of the alternative magnetic field. This change is manifested through a change in the frequency factor k0 and not through a change in the activation energy Q. The frequency factor k0 for intermediate phase growth with an alternative magnetic field is 39.95 cm2/s for γ phase and 2.84×10-4 cm2/s for β phase compared with those without the magnetic field is 22.4 cm2/s for γ phase and 1.53×10-4 cm2/s for β phase.
关键词:
Alternative magnetic field
,
null
,
null
,
null
,
null
王辉
,
曹丽云
,
金利华
,
王耀
,
吕剑峰
,
黄剑锋
,
李成山
低温物理学报
采用全化学溶液沉积方法在NiW衬底上制备La2Zr2O7缓冲层和YBCO薄膜.采用X射线衍射和扫描电镜研究了不同的LZO缓冲层厚度对超导层的影响.不同厚度LZO的面内外织构具有一定差别.当LZO厚度达到145 nm时,LZO缓冲层的织构和阻隔能力最佳,才能制备出具有良好性能YBCO超导层.
关键词:
缓冲层
,
厚度
,
YBCO薄膜
