The Effects of Feedstock Powder and Deposition Technique on the Hardness and Tribological Performance of Thermal-Sprayed WC-Co Coatings

2015 ◽  
pp. 1-24
Author(s):  
Traugott E. Fischer ◽  
Yunfei Qiao ◽  
YouRong Liu
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
High Velocity ◽  
Abrasion Resistance ◽  
Steel Substrate ◽  
Tribological Performance ◽  
Deposition Technique ◽  
Wear Resistant ◽  
Wear Resistant Coatings ◽  
The Difference

The wear resistance of thirty WC-Co coatings, deposited by standard High-Velocity Oxyfuel (HVOF) techniques and a high-temperature variant of HVOF, with standard commercial and experimental nanostructured feedstocks, is examined. It is found that the high-temperature gun produces harder and more wear-resistant coatings than the standard gun. The latter does not generate high enough temperatures to melt the powder and provide good bonding between WC grains and Co binder. All coatings present higher wear resistance than the steel substrate. Coatings deposited with standard feedstock possess generally higher wear resistance than nanostructured coatings. The difference is more pronounced in sliding than in abrasive wear. WC-Co Coatings deposited with nanostructured feedstocks are recommended for use in bearings and other machinery with sliding parts because they inflict much less wear on the material on which they slide than conventional coatings. Coatings with micrometer WC grains are recommended for abrasion resistance applications such as earth moving or slurry processing machinery.

scholarly journals Composite Metal-Matrix Alloys Based on Ni-Al for Obtaining Wear-Resistant Coatings by Electric Spark Deposition

2021 ◽  
Vol 346 ◽  
pp. 02004
Author(s):  
S.N. Khimukhin ◽  
S.V. Nikolenko ◽  
L.A. Konevtsov ◽  
E.D. Kim
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Liquid Phase ◽  
Metal Matrix ◽  
Temperature Synthesis ◽  
Complex Composition ◽  
Wear Resistant ◽  
Research Results ◽  
Wear Resistant Coatings ◽  
High Temperature Synthesis

The paper presents the research results on produsing by the method of liquid-phase self-propagating high-temperature synthesis (SHS) the composite metal-matrix alloys intended for the obtaining of wear-resistant coatings by electric spark deposition (ESD). Oxides NiO, Cr2O3 and mineral concentrate ZrO2 were used as a melting charge. Alloys based on the Ni-Al system with aluminides of complex composition containing Cr and Zr were obtained by means of the alumothermic SHS reaction. Wear-resistant coatings were formed on steel 45 by the ESD method by means of the newly obtained alloys,. The maximum wear resistance of the coatings was obtained using the alloys containing Cr (wt% 18) and Zr (wt% 1.9).

Microstructure and Abrasion Resistance of WC-Co Coatings Produced by High Velocity Oxy-Fuel Spraying

1997 ◽  
Author(s):  
M.S.A. Khan ◽  
T.W. Clyne ◽  
A.J. Sturgeon
Keyword(s):  
Wear Resistance ◽  
High Velocity ◽  
Abrasion Resistance ◽  
Close Correlation ◽  
Low Oxygen ◽  
Hvof Spraying ◽  
Degree Of Reaction ◽  
Small Rise ◽  
Negative Effect ◽  
Positive Effect

Abstract Coatings have been produced by HVOF spraying of four different WC-Co powders, using two fuel gases and two oxygen contents in the flame, and characterised in terms of microstructure and resistance to abrasive wear. It is concluded that there is a close correlation between high levels of chemical reaction, occurring during spraying (and possibly during powder production), and poor wear resistance. Good wear resistance is favoured by using low porosity powders, which interact with the atmosphere less readily during spraying, and also by using a flame with a relatively low oxygen content. This probably minimises the degree of reaction by ensuring that conditions are reducing. Use of propylene rather than hydrogen gives coatings with slightly better wear resistance, despite the fact that the flame temperatures are higher. It is concluded that, for this relatively small rise in temperature, the positive effect on inter-splat cohesion seems to outweigh the negative effect of increased decarburisation.

High temperature wear-resistant coatings

1978 ◽  
Vol 53 (3) ◽  
pp. 353-364 ◽  
Author(s):  
T.A. Wolfla ◽  
R.C. Tucker
Keyword(s):  
High Temperature ◽  
Wear Resistant ◽  
Wear Resistant Coatings ◽  
High Temperature Wear

CREUSABRO DUAL

Alloy Digest ◽  
2011 ◽  
Vol 60 (12) ◽  
Keyword(s):  
Wear Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
High Resistance ◽  
Abrasion Resistance ◽  
Sliding Wear ◽  
Wear Resistant ◽  
Advanced Development

Abstract Creusabro Dual is an advanced development in wear-resistant steels where the metal, alloyed with 0.6% Ti, produces excellent sliding wear resistance. It is unique to offer wear resistance at this level of hardness (500 HB), with such high abrasion resistance combined with high resistance to cracking in service. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on wear resistance as well as forming and joining. Filing Code: SA-639. Producer or source: Industeel USA, LLC.

CREUSABRO 4800

Alloy Digest ◽  
2008 ◽  
Vol 57 (5) ◽  
Keyword(s):  
Fracture Toughness ◽  
Wear Resistance ◽  
High Temperature ◽  
Tensile Properties ◽  
Work Hardening ◽  
High Performance ◽  
Resistant Steel ◽  
Wear Resistant ◽  
Temperature Performance ◽  
Efficient Work

Abstract Creusabro 4800 is a high-performance wear-resistant steel exhibiting better resistance than other quenched steels with a hardness of 400 HB. This 4800 alloy uses a combination of fine distribution of microcarbides and an efficient work hardening in service to achieve wear resistance. This datasheet provides information on composition, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on high temperature performance and wear resistance as well as forming, machining, and joining. Filing Code: SA-579. Producer or source: Industeel USA, LLC.

A Study in the High Temperature Tribological Characteristics of the Plasma Sprayed ZrO2 Coating

1998 ◽  
Author(s):  
Y.S. Song ◽  
J.-C. Han ◽  
M.-H. Park ◽  
B.-H. Ro ◽  
K.-H. Lee ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Thermal Stress ◽  
High Temperature ◽  
Bond Strength ◽  
Thermal Shock ◽  
Plasma Spray ◽  
Intermediate Layer ◽  
Stabilized Zirconia ◽  
High Temperature Wear ◽  
The Difference

Abstract The Thermal Barrier Coating (TBC) used to improve the heat barrier and wear resistant property in high temperature of the aircraft engine and the automobile engine, usually has a two layer structure. One is a ceramic top layer for heat insulation and the other is a metal bond layer to facilitate the bond strength between the top ceramic layer and the substrate. But, the coated layers can be peeled off because of the accumulation of the thermal stress by the difference of the thermal expantion coefficient between metal and ceramics in a heat cyclic environment. In this study, the intermediate layer produced by plasma spray process was introduced to reduce the thermal stress. The powders of plasma spray coating were Yttria Stabilized Zirconia (YSZ), Magnesia Stabilized Zirconia (MSZ) and NiCrAIY. The intermediate layer was sprayed with the powders of partially stabilized zirconia with 50wt% NiCrAIY between the ceramics top coat and the bond coat for the purpose of alleviating heat expansion. The high temperature wear and thermal shock test were conducted. The high temperature wear resistance of the YSZ TBC was better than that of the MSZ TBC. The wear resistance decreased with incresing temperature between 400°C to 600°C. The 3 layers TBC with YSZ top coating showed the best thermal shock resistance. This means that the intermediate layer played an importnat roll to alleviate the difference of the thermal expansion between metallic layer and ceramics layer. SEM and OM were examined. The bond strength, hardness test, and wear test were also studied

High-Temperature Dry Sliding Wear Behavior of Ti–10V–2Fe–3Al

2021 ◽  
Vol 143 (12) ◽  
Author(s):  
Calvin Samuel. S ◽  
Yash Chodancar ◽  
Smit Kanther ◽  
Arivarasu M. ◽  
T. Ram Prabhu
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Wear Mechanisms ◽  
Tribological Performance ◽  
Wear Loss ◽  
Oxide Formation ◽  
Protective Oxide ◽  
Testing Conditions ◽  
X Ray ◽  
Temperature Conditions

Abstract In this study, the microstructure, high-temperature tribological performance, and mechanical properties of solution-aged Ti–10V–2Fe–3Al were investigated. The microstructure of solution-aged Ti–10V–2Fe–3Al reveals a bimodal α and β microstructure with uniformly dispersed α precipitates in the β matrix phase. The hot tribological performance of solution-aged Ti–10V–2Fe–3Al was investigated at different temperatures (28, 250, 350, and 450 °C) in a high-temperature pin-on-disc configuration. The wear mechanisms were evaluated at the worn-out surface using a scanning electron microscope (SEM). The abrasive wear mechanism is predominant at 28 °C and 250 °C testing conditions, whereas the oxidation and delamination are dominant wear mechanisms at 350 °C and 450 °C testing conditions. The worn-out surface at different temperature conditions was characterized by X-ray diffraction (XRD) and energy-dispersive X-ray spectrometer (EDS) analysis. The absence of protective oxide formation at 28 °C and intermittent protective oxide formation at 250 °C testing condition are ineffective in protecting the surface from wear damages and high wear loss. The protective tribo-oxide formations at 350 °C and 450 °C are continuous and provide improved wear resistance behavior of the material. The V2O5-rich tribo-oxide layer formation at 350 °C offers excellent wear resistance and protection against wear damages among the testing conditions. The Vickers microhardness study of the samples tested at different temperature conditions shows significant differences in the hardness magnitude at the cross section.

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