Improvement in Wear Resistance of Nano WC-Co Coatings Fabricated by Detonation Gun Spraying

2007 ◽

Vol 539-543 ◽

pp. 1264-1269

Author(s):

S.Y. Park ◽

Moon Chul Kim ◽

Chan Gyung Park

Keyword(s):

Heat Treatment ◽

Fracture Toughness ◽

Wear Resistance ◽

Amorphous Phase ◽

Phase Decomposition ◽

Post Heat Treatment ◽

Detonation Gun Spraying ◽

Carbide Phases ◽

Carbide Size ◽

Detonation Gun

Nano structured WC-Co coatings with carbide size of 100−200nm were fabricated by detonation gun spraying. The fabricated nano coatings showed improved hardness and wear resistance compared to micron WC-Co coatings. Considerable phase decomposition of WC to W2C and amorphous phase in nano coatings was detected, which is known to degrade wear resistance of coatings. In order to improve the wear resistance of the coatings by recovering of dissociated carbide phases, post heat treatment was conducted in Ar environment at temperature range of 400−900°C. Harness, fracture toughness and wear resistance of nano coatings were significantly improved by post heat treatment. The improved properties were elucidated and discussed in terms of microstructure and phase compositions.

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Evaluation of Microstructural Characteristics in Alumina Produced by Selective Laser Stereolithography and Detonation Gun Spraying

Metallography Microstructure and Analysis ◽

10.1007/s13632-020-00658-x ◽

2020 ◽

Vol 9 (4) ◽

pp. 503-510

Author(s):

Fardad Azarmi ◽

X. W. Tangpong

Keyword(s):

Microstructural Characteristics ◽

Detonation Gun Spraying ◽

Detonation Gun ◽

Laser Stereolithography

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The Corrosion Resistance Mechanism of Fe-Based Amorphous Coatings Synthesised by Detonation Gun Spraying

Journal of Materials Engineering and Performance ◽

10.1007/s11665-020-04876-w ◽

2020 ◽

Vol 29 (6) ◽

pp. 3921-3929 ◽

Cited By ~ 2

Author(s):

Weichao Ning ◽

Haimin Zhai ◽

Rongzhen Xiao ◽

Dongqing He ◽

Gang Liang ◽

...

Keyword(s):

Corrosion Resistance ◽

Resistance Mechanism ◽

Detonation Gun Spraying ◽

Detonation Gun ◽

Amorphous Coatings

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Bulk Metallic Glasses Produced by Detonation Gun Spraying

MRS Proceedings ◽

10.1557/proc-554-113 ◽

1998 ◽

Vol 554 ◽

Author(s):

T. P. Shmyreva

Keyword(s):

Metallic Glasses ◽

Coefficient Of Thermal Expansion ◽

Bulk Metallic Glasses ◽

Order Structure ◽

Detonation Gun Spraying ◽

Detonation Gun ◽

Sprayed Coatings ◽

Irreversible Nature ◽

Amorphous Coatings ◽

Iron Chromium

AbstractBulk metallic glasses in the form of amorphous coatings were produced by detonation gun spraying of eutectic alloy containing iron, chromium, phosphorus and carbon. The thickness of the resulting homogeneous amorphous deposit may be up to 2–3 millimeters. The heat capacity, the coefficient of thermal expansion, the corrosion resistance, the hardness and the short range order structure parameters were studied for the bulk metallic glasses and thin ribbon. The investigation revealed that time (for 3 year) and temperature (300–670K) related structural relaxation in amorphous alloys is a nonmonotonic wavelike process having an irreversible nature. The amorphous detonation sprayed coatings have been successfully employed for improving service properties of medical instruments.

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Deposition and Characterization of D-Gun Sprayed WC-Co Coating with Self-Lubricating Property

Materials Science Forum ◽

10.4028/www.scientific.net/msf.544-545.215 ◽

2007 ◽

Vol 544-545 ◽

pp. 215-218

Author(s):

Hao Du ◽

Chao Sun ◽

Jun Gong ◽

Soo Wohn Lee

Keyword(s):

Wear Resistance ◽

Wear Rate ◽

Sliding Wear ◽

Friction And Wear ◽

Wear Track ◽

Wear Property ◽

Ni Powder ◽

Lubricating Property ◽

Detonation Gun

A WC-Co coating with self-lubricating property was deposited by detonation gun (D-gun) process, using a WC-Co powder doped with a MoS2-Ni powder, under a proper spray condition. It is proved that the MoS2 composition was kept in the resulting coating by SEM, XRD and EPMA. Evaluation on sliding wear property indicates that the MoS2 composition plays an important role in lowering both coefficient of friction and wear rate for the resulting coating, which is confirmed by observations on wear track. It suggests that the deposition of WC-Co coating with self-lubricating property by D-gun spray is feasible by controlling lubricant powder and spray conditions, which can exhibit higher sliding wear resistance.

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Interfacial Bonding Strength of Graded ZrO2/NiCrAlY Coatings Accumulated by Detonation Gun Spraying

International Journal of Modern Physics B ◽

10.1142/s0217979203018661 ◽

2003 ◽

Vol 17 (08n09) ◽

pp. 1152-1157

Author(s):

Do Won Seo ◽

Jab Kyoo Lim

Keyword(s):

Bonding Strength ◽

Functionally Graded ◽

Interfacial Bonding ◽

Mechanical And Thermal Properties ◽

Crosshead Speed ◽

Detonation Gun Spraying ◽

Duplex Coating ◽

Interfacial Bonding Strength ◽

Graded Coatings ◽

Detonation Gun

Functionally graded ZrO2/NiCrAlY coatings are produced by detonation gun spraying using spheroid powers as the feedstock. A commercial Ni-based alloy is used for metallic substrate. The composition and microstructure are changed gradually through the six-layer graded coatings that are beneficial for the improvement of mechanical and thermal properties of the coatings. The shear test is carried out to analyze the interfacial bonding strengths of graded coatings. And non-graded duplex coatings are tested for comparative study. The effects of cross-sectional size and crosshead speed on interfacial strength properties are also studied. Results show that interfacial strengths of graded coatings are increased gradually with increase of volumetric rate of NiCrAlY. The bonding strength of the functionally graded coating is about twice as high as that of the duplex coating. For duplex coating without metallic interlayer and below 5 mm/min, the interfacial bonding strength of ZrO2/NiCrAlY interface increase with increasing crosshead speed.

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