Study of Microstructure and Adhesion Strength of WC-Co Coating Sprayed by High Velocity Oxygen Fuel

2011 ◽  
Vol 189-193 ◽  
pp. 306-310
Author(s):  
Mei Lin Zhang ◽  
Ming Wei Zhao
Keyword(s):  
Adhesion Strength ◽  
High Velocity ◽  
Layer Structure ◽  
Steel Substrate ◽  
High Velocity Oxygen Fuel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Grit Blasting ◽  
High Adhesion ◽  
Oxygen Fuel

WC-12 %Co powders were sprayed by high velocity oxygen fuel (HVOF) to prepare coatings on carbon steel substrate, which was pretreated by electrospark and grit blast before spraying. The surface coating of WC-Co and the intermediate layer structure were studied by scanning electron microscopy and X-ray diffraction. The adhesion strength of the coating was measured by a scratching tester. Results show that the roughness value of the grit blasting and electrospark strengthened surface were 60~70 μm and 40~50 μm, respectively. The coating pretreated by grit blast and electrospark was dense and was bonded well with the substrate. The heat affected zone of the grit blasted specimen was larger than that of the electrospark pretreated one. The average adhesion strength of the coating pretreated with grit blasting and that with eletrospark were 35.00 N and 12.48 N, respectively. The reasion of the high adhesion strength of the grit blasting coating is discussed.

An Adhesion Study of Copper and Chromium Films to Polyimide

1993 ◽  
Vol 323 ◽  
Author(s):  
T. G. Chung ◽  
Jin Yu ◽  
Y.-H. Kim ◽  
E. C. Ahn ◽  
I. S. Park
Keyword(s):  
Adhesion Strength ◽  
Polymer Surface ◽  
Peel Test ◽  
Peel Strength ◽  
Metal Strip ◽  
Rf Plasma ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Adhesion ◽  
Chromium Films

AbstractAdhesion of Cu and Cr to polyimide was studied by 90° peel test, AES, and X-ray diffraction. The two necessary conditions of the high adhesion strength were the presence of Cr interlayer and the preactivation of the polymer surface by RF plasma treatment. The Cr is thought to react with activated polyimide to form carbide-like bonds which enhance the adhesion strength drastically. Correlations between the peel strength and C260/Cr527 Auger PHR from the peeled metal strip were good. Qualitatively, the peel strength is related to the amount of plastic deformation done on the metal strip during peeling.

Microstructure and Hardness Characterization of a NiCr/Cr3C2 Coating by High-Velocity Oxy-Fuel Thermal Spraying

2009 ◽  
Vol 79-82 ◽  
pp. 397-400
Author(s):  
Yu Ping Wu ◽  
Gai Ye Li
Keyword(s):  
Electron Microscopy ◽  
Stainless Steel ◽  
High Velocity ◽  
Steel Substrate ◽  
Thermal Spraying ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Hvof Thermal Spraying

A NiCr/Cr3C2 composite coating with a thickness of approximately 200 m was deposited onto 1Cr18Ni9Ti stainless steel substrate by high-velocity oxy-fuel (HVOF) thermal spraying. Microstructure of the coating was characterized using X-ray diffraction(XRD), scanning electron microscopy(SEM) and transmission electron microscopy (TEM). The coating comprised a NiCr matrix and two types of carbides. The NiCr matrix was composed of an amorphous phase and nanocrystalline grain with a size of 10–50 nm. The microhardness of the coating was found to be 1200Hv, which is significantly greater than that of the stainless steel (1Cr18Ni9Ti) substrate (285 Hv).

Wear and microstructural properties of coatings on Weldox 700 steel

2020 ◽  
Vol 62 (6) ◽  
pp. 645-651
Author(s):  
Cihan Özorak ◽  
Faik Okay ◽  
Ebru Özorak ◽  
Serkan Islak
Keyword(s):  
Steel Substrate ◽  
Hardness Measurement ◽  
X Ray Diffraction ◽  
Properties Of Coatings ◽  
Sem Images ◽  
X Ray ◽  
Oxygen Fuel ◽  
Hardness Values ◽  
Wear Tests ◽  
Ball On Disc

Abstract In this study, the wear and microstructure properties of some coatings produced on Weldox 700 steel were investigated via a high-velocity oxygen fuel (HVOF) technique. For the coating types, NiCrBSi, WCCo and CoNiCrAlY-based coatings were selected. Microstructure and phase formation were examined via scanning electron microscopy (SEM), X-ray diffraction and X-ray energy dispersive spectrometry. Wear tests of the substrate and coatings were made using the ball-on-disc method. It can be seen from the SEM images that the coating layers are metallurgically/ mechanically connected to the substrate and have a mostly homogeneous structure. The hardness measurement was taken from the top of the coatings. The hardness values of the coatings were significantly higher than those of the substrate. The coated substrates exhibit a very good tribological performance compared with the substrate. Depending on the load, the wear rate and coefficient of friction of the coatings were much lower as compared with the Weldox 700 steel substrate.

Multi-objective optimization of WC-12Co coating by high-velocity oxygen fuel spray using multiple regression-based weighted signal-to-noise ratio

2021 ◽  
pp. 095440542097666
Author(s):  
Thanh-Phu Nguyen ◽  
Thanh-Hoa Doan ◽  
Van-Canh Tong
Keyword(s):  
Multiple Regression ◽  
Adhesion Strength ◽  
High Velocity ◽  
Signal To Noise Ratio ◽  
Fuel Spray ◽  
Spray Parameters ◽  
High Velocity Oxygen Fuel ◽  
Signal To Noise ◽  
Noise Ratio ◽  
Oxygen Fuel

In this study, the optimal process parameters for a high-velocity oxygen fuel spray, which was used to deposit WC-12Co coating on a 16Mn steel substrate, were studied to simultaneously improve the microhardness, adhesion strength, and porosity of the coating. To this end, trial tests were conducted to determine the feasible ranges of the spray parameters: powder feed rate ( A), spray distance ( B), and oxygen/propane mixture ratio ( C). Taguchi orthogonal array (L9) experimental design was used to determine regression formulae for the microhardness, adhesion strength, and porosity. Then, based on a method using the multiple regression-based weighted signal-to-noise ratio, the optimal spray parameters were identified. To verify the optimization results, confirmation experiments were carried out. An analysis of variance was also conducted to check the proportion of contribution of the spray parameters on the output quality characteristics. The confirmation test results proved that the predicted and measured results were in good agreement. The optimal conditions of the high-velocity oxygen fuel spray were: A = 32 g/min, B = 0.35 m, and C = 5. The estimated optimal coating properties were: microhardness = 1335.784 HV, adhesion strength = 64.659 MPa, and porosity = 1.797%. The oxygen/propane ratio showed the highest contribution to the microhardness, whereas the most influential factor for both adhesion strength and porosity was the spraying distance.

COLMONOY NO. 43HV

Alloy Digest ◽  
2008 ◽  
Vol 57 (7) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Surface Treatment ◽  
High Velocity ◽  
Base Alloy ◽  
Heat Treating ◽  
High Velocity Oxygen Fuel ◽  
Nickel Base Alloy ◽  
Nickel Base ◽  
Oxygen Fuel

Abstract Colmonoy No. 43HV comprises a nickel-base alloy recommended for hard surfacing parts to resist wear, corrosion, heat, and galling. Deposits that have moderate hardness have increased ductility and slightly less resistance to abrasion than Colmonoy 53HV. Deposits can be finished by grinding or machined with carbide tooling. Colmonoy No. 43HV is supplied as an atomized powder specially sized for application with high-velocity oxygen fuel (HVOF) systems. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on corrosion resistance and surface qualities as well as heat treating and surface treatment. Filing Code: Ni-664. Producer or source: Wall Colmonoy Corporation.

scholarly journals Effects of Sintering Temperature on Densification, Microstructure and Mechanical Properties of Al-Based Alloy by High-Velocity Compaction

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 218
Author(s):  
Xianjie Yuan ◽  
Xuanhui Qu ◽  
Haiqing Yin ◽  
Zaiqiang Feng ◽  
Mingqi Tang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Velocity ◽  
Sintered Density ◽  
Sintering Temperature ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Transmission Electron ◽  
High Velocity Compaction ◽  
Sintered Temperature

This present work investigates the effects of sintering temperature on densification, mechanical properties and microstructure of Al-based alloy pressed by high-velocity compaction. The green samples were heated under the flow of high pure (99.99 wt%) N2. The heating rate was 4 °C/min before 315 °C. For reducing the residual stress, the samples were isothermally held for one h. Then, the specimens were respectively heated at the rate of 10 °C/min to the temperature between 540 °C and 700 °C, held for one h, and then furnace-cooled to the room temperature. Results indicate that when the sintered temperature was 640 °C, both the sintered density and mechanical properties was optimum. Differential Scanning Calorimetry, X-ray diffraction of sintered samples, Scanning Electron Microscopy, Energy Dispersive Spectroscopy, and Transmission Electron Microscope were used to analyse the microstructure and phases.

Preparation of β-PbO2 and β-PbO2-MnO2 Coating on Stainless Steel Substrate

2012 ◽  
Vol 490-495 ◽  
pp. 3486-3490
Author(s):  
Qiang Yu ◽  
Zhen Chen ◽  
Zhong Cheng Guo
Keyword(s):  
Stainless Steel ◽  
Mass Fraction ◽  
Stainless Steel Substrate ◽  
Steel Substrate ◽  
Substrate Material ◽  
X Ray Diffraction ◽  
X Ray ◽  
New Type ◽  
Plating Solution ◽  
Element Mass Fraction

In order to prepare a new type of anode material, stainless steel was selected as substrate material. The β-PbO2 coating on stainless steel substrate was prepared under the appropriate plating solution, and the PbO2-MnO2 coating was prepared with thermal decomposition. The crystal structure was determined by X-ray diffraction; Surface morphology was test by Scanning Electron Microscopy; the energy spectrum was used to determine element mass-fraction and the ratio of atomic number of the coatings.

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