Open Science Research Excellence

Snorouzi

Publications

7

Publications

7
4311
Bond Strength in Thermally Sprayed Gas Turbine Shafts
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
6
5713
Effect of Spray Stand-off on Hardness of Thermally Sprayed Coatings
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:
HVOF, Micro-indentation, Thermal spray, WC-Co.
5
7629
Effect of Spray Stand-off on Elasticity Modulus of Thermally Sprayed Coatings
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
4
9665
Residual Stresses in Thermally Sprayed Gas Turbine Components
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
3
11791
Development Trend in Investigation of Residual Stresses in WC-Co Coating by HVOF Thermal Spraying
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
2
12280
Babbitt Casting and Babbitt Spraying Processes Case Study
Abstract:

In this paper, the babbitting of a bearing in boiler feed pump of an electromotor has been studied. These bearings have an important role in reducing the shut down times in the pumps, compressors and turbines. The most conventional method in babbitting is casting as a melting method. The comparison between thermal spray and casting methods in babbitting shows that the thermal spraying babbitt layer has better performance and tribological behavior. The metallurgical and tribological analysis such as SEM, EDS and wet chemical analysis has been made in the Babbitt alloys and worn surfaces. Two type of babbitt materials: tinbase and lead-base babbitt was used. The benefits of thermally sprayed babbitt layers are completely clear especially in large bearings.

Keywords:
Thermal spray, Babbitting, Bonding, Bearing, BFP, CWP
1
13803
Application of HVOF Thermal Spraying inHigh Speed Gas Compressor Shafts
Abstract:
In this paper, the application of thermal spray coatings in high speed shafts by a revolution up to 23000 RPM has been studied. Gas compressor shafts are worn in contact zone with journal therefore will be undersized. Wear mechanisms of compressor shaft were identified. The predominant wear mechanism is abrasion wear. The worn surface was coated by hard WC-Co cermets using high velocity oxy fuel (HVOF) after preparation. The shafts were in satisfactory service in 8000h period. The metallurgical and Tribological studies has been made on the worn and coated shaft using optical microscopy, scanning electron microscopy (SEM) and X-ray diffraction.
Keywords:
Thermal spray, Residual stress, Wear mechanism,HVOF, Gas compressor shafts.