Full-Text Search:
Home|About CNKI|User Service|中文
Add to Favorite Get Latest Update


Chen Chuanzhong (Institute of Materials Science and Engineering, Shandong University of Technology, Jinan 250061)  
The microstructure and phase composition of laser_cladded Al_2O_3+TiO_2 composite ceramic coatings on 45# steel are studied. The results show that lamellas structure characteristics of plasma_sprayed coatings have been eliminated, and columnar grains are formed approximately along the heat conducting direction after laser cladding, and the Al_2O_3+TiO_2 composite ceramic coating consists of α-Al_2O_3,TiO_2, ~γ-Al_2O_3 and Al_2TiO_5. Ti and a small amount of Cr,Fe,Y elements from the bond coating appear in the columnar grain of ~α-Al_2O_3. The grain boundary consists of Al_2TiO_5 phase formed by Al_2O_3 and TiO_2, in which a part of Ti is replaced by a small amount of Cr, Fe and Y elements from the bond ~coating. *#The bond coating consists *#of*# γ-Ni*# based *# solid*# solution containing Fe,Cr,Al and Y elements, and γ′-(Ni,Fe)_3Al phase distributes dispersedly on it. There is a metallurgical combination interface between the bond coating and substrate. The interface between the ceramic coating and the bond coating has been improved obviously.
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©CNKI All Rights Reserved