Development Trend in Investigation of Residual Stresses in WC-Co Coating by HVOF Thermal Spraying

Year: 2011 Volume: 5 Issue: 6 505 - 508 Pages

• Authors:
• M.Jalali Azizpour
• S.Norouzi
• H.Mohammadi Majd
• D.Sajedipour
• R.Mohammadi Sadr
• M.Derakhshan Mehr
• S.A Shoabi
• R.Mohammadi

Abstract: In this paper, the techniques for estimating the residual stress in high velocity oxy fuel thermal spray coatings have been discussed and compared. The development trend and the last investigation have been studied. It is seemed that the there is not effective study on the effect of the peening action in HVOF analytically and numerically.

• Keywords:
• HVOF
• WC-Co
• Residual stress
• Compressive stress

Residual Stresses in Thermally Sprayed Gas Turbine Components

Year: 2011 Volume: 5 Issue: 6 1088 - 1090 Pages

• Authors:
• M.Jalali Azizpour
• S.Norouzi
• D.Sajedipour
• H.Mohammadi Majd

Abstract: In this paper, the residual stress of thermal spray coatings in gas turbine component by curvature method has been studied. The samples and shaft were coated by hard WC-12Co cermets using high velocity oxy fuel (HVOF) after preparation in same conditions. The curvature of coated samples was measured by using of coordinate measurement machine (CMM). The metallurgical and Tribological studies has been made on the coated shaft using optical microscopy and scanning electron microscopy (SEM)

• Keywords:
• Thermal spray
• Residual stress
• Wear mechanism
• HVOF
• Gas compressor shafts

Effect of Spray Stand-off on Elasticity Modulus of Thermally Sprayed Coatings

Year: 2012 Volume: 6 Issue: 1 162 - 164 Pages

• Authors:
• M.Jalali Azizpour
• S.Norouzi
• H.mohammadi Majd
• M.M.Rabieh
• D.Sajedipour
• A. Jaderi

Abstract: The mechanical and tribological properties in WC-Co coatings are strongly affected by hardness and elasticity specifications. The results revealed the effect of spraying distance on microhardness and elasticity modulus of coatings. The metallurgical studies have been made on coated samples using optical microscopy, scanning electron microscopy (SEM).

• Keywords:
• Elasticity modulus
• HVOF
• Micro-indentation
• Thermal spray
• WC-Co

Bond Strength in Thermally Sprayed Gas Turbine Shafts

Year: 2011 Volume: 5 Issue: 6 996 - 998 Pages

• Authors:
• M.Jalali Azizpour
• S.Norouzi
• D.Sajedipour
• H.Mohammadi majd
• S.A.Hosseini
• H.Talebi
• A.Ghamari

Abstract: In this paper, the bond strength of thermal spray coatings in high speed shafts has been studied. The metallurgical and mechanical studies has been made on the coated samples and shaft using optical microscopy, scanning electron microscopy (SEM).

• Keywords:
• Thermal spray
• Residual stress
• Wear mechanism
• HVOF
• Gas compressor shafts