Onder Albayrak
材料科学技术（英文）
A new method for the production of the coating surface consisting of tricalcium phosphate (TCP) and titanium dioxide (TiO2) on titanium (Ti) substrates by using electrophoretic deposition (EPD) method has been developed. Crack occurrence on coating surface and hydroxyapatite (HA) decomposition into TCP, which are commonly encountered in EPD method, were used as an advantage in this study. HA nano-powders synthesized by acid-base method were used as the coating material. They were deposited on Ti substrates with different voltages and durations. Cracks on the deposited surface were observed by scanning electron microscopy (SEM). Samples were sintered in air atmosphere to allow TiO2 growth from the Ti substrate to fill the cracks. SEM observation and X-ray diffraction (XRD) analysis proved the occurrence of complete decomposition of HA into TCP, TiO2 growth between cracks, and coalescence of TCP/TiO2 on coating surface. This type of coating surface is expected to increase the coating strength because of TiO2 growth in the cracks and its coalescence with TCP.
关键词:
Electrophoretic deposition
,
Hydroxyapatite
,
Bioceramics
,
Microstructure.
Q. Y Pan
,
WD. Huang
,
YM. Li
,
X. Lin
,
YH. Zhou and X.C. Yan( State Key Lab. of Solidification Processing
,
Northwestern Polytechnical University
,
Xi'an 710072
,
China ( Laser Processing Center
,
Tianjin College of Textile Technology
,
Tianjin 300160
,
China )
金属学报(英文版)
A novel wide-band laser cladding system, with high rate of cladding, has been developed in the present work. The system mainly consisted of a 5kW CO2 laser, an automatic Fowder feeder and a wide-band scanning rotative polygon mirmr which can produce a linear or rectangular focused laser beam. Using this system, a Ni-Cr-Si-B alloy powder was cladded on the sudece of tgpe 321 austenitic stainless steel in onder to improve its wear and cormsion resistance. The pitting cormsion, high temperuture oxidation and wear tests were conducted in onder to evaluate the propertles of the laser cladded layer. The results demonstrated that the cladded layer can significantly improtte the adhesive wear and pitting cormsion resistance of the substmte. Moreover,the cladded layer exhibited good oxidafion resistance, which is almost the same as that of GMR-235D N-based superalloy.
关键词:
austenitic stainless steel
,
null
,
null
,
null
