Effect of Nano-ZrO2 on the Microstructure and High Temperature Tribological Properties of MoSi2 Coating

Molybdenum disilicide (MoSi2)-based composite coating using nano-ZrO2 as an additive was deposited on a nickel-based alloy by air plasma spraying, and the phase composition and microstructure of the composite coating were characterized by x-ray diffraction (XRD) and scanning electron microscope. The high-temperature abrasive wear properties of the ZrO2-MoSi2 composite coating were compared with the pure MoSi2 coating at 1100 °C. The XRD results show that there exists mutual transformation between T-MoSi2 and H-MoSi2 phase and part of Mo-rich phases are formed because of oxidization during the spraying processing. The addition of nano-ZrO2 could improve the adhesion between the splats, prevent cracking along the interface between the splats, and purify the boundaries. The ZrO2-MoSi2 composite coating exhibits improved wear resistance compared with the pure MoSi2 coating. The addition of nano-ZrO2 could effectively mitigate the adhesion wear and brittle delamination of the MoSi2 coating.

[1]  J. Hawk,et al.  Abrasive wear of Si3N4-MoSi2 composites , 1997 .

[2]  J. Hawk,et al.  Abrasive wear of Si3N4MoSi2 composites , 1997 .

[3]  J. Hawk,et al.  Role of composition and microstructure in the abrasive wear of high-alumina ceramics , 1999 .

[4]  Siyong Gu,et al.  Effect of La2O3 on the wear behavior of MoSi2 at high temperature , 2011 .

[5]  R. Suzuki,et al.  MoSi2 coating on molybdenum using molten salt , 2000 .

[6]  Xiaohong Shi,et al.  A MoSi2–SiC–Si/glass oxidation protective coating for carbon/carbon composites , 2006 .

[7]  R. N. Wright,et al.  FeAl and Mo–Si–B intermetallic coatings prepared by thermal spraying , 2003 .

[8]  K. Niihara,et al.  Effects of ZrO2 addition on microstructure and mechanical properties of MoSi2 , 1995 .

[9]  Q. Xue,et al.  Study of wear resistant MoSi2–SiC composites fabricated by self-propagating high temperature synthesis casting , 2003 .

[10]  J. Hawk,et al.  A comparative study of the abrasive wear behavior of MoSi2 , 1995 .

[11]  W. Soboyejo,et al.  Residual stresses and transformation toughening in MoSi2 composites reinforced with partially stabilized zirconia , 1996 .

[12]  刘心宇,et al.  Room-Temperature Mechanical Properties of Rare Earths Reinforced MoSi 2 Material , 2001 .

[13]  Xu Liang-liang.  Histology and high-temperature oxidation resistance of molybdenum disilicide coating , 2006 .

[14]  Si-wen Tang,et al.  Microstructure and Oxidation Behavior of Molybdenum Disilicide Coating Prepared by Air Plasma Sprayed , 2011 .

[15]  S. Ramasesha,et al.  Performance of monolithic and TiB2 reinforced MoSi2 in dry sliding contact with steel , 2002 .

[16]  J. Hawk,et al.  Abrasive wear behavior of a brittle matrix (MoSi2) composite reinforced with a ductile phase (Nb) , 2001 .

[17]  Jingli Shi,et al.  Oxidation protective behavior of SiC/Si-MoSi2 coating for different graphite matrix , 2006 .

[18]  Gyeungho Kim,et al.  Effect of ammonia nitridation on the microstructure of MoSi2 coatings formed by chemical vapor deposition of Si on Mo substrates , 2002 .

[19]  S. Urvoy,et al.  Microstructure and thermal conductivity of Mo-TiC cermets processed by hot isostatic pressing , 2008 .

[20]  M. Kramer,et al.  Characterization and oxidation behavior of silicide coating on multiphase Mo–Si–B alloy , 2008 .

[21]  Jinsheng Pan,et al.  Wear behavior of TiC–MoSi2 composites , 2003 .

[22]  E. Courtright.  A comparison of MoSi2 matrix composites with other silicon-base composite systems , 1999 .