Oxidation Behavior and High Temperature Friction and Wear Resistance of TiN-VC Reinforced VN Alloy/Co-Based Composite Coatings by Laser Cladding

Incorporation of metallic elements, titanium and copper, into carbonaceous mesophase (CM) was performed through mechanical alloying in a ball mill apparatus. The structures of the raw CM as well as the Ti/Cu-added CM were characterized by X-ray diffraction. The tribological behavior of the Ti/Cu-added CM used as lubricating additives was investigated by using a high temperature friction and wear tester. The results show that, compared with the raw CM, the Ti/Cu-added CM exhibits a drop in the crystallinity and a transition to the amorphous. The Ti/Cu-added CM used as lubricating additive displays an obvious high temperature anti-friction and wear resistance effect, and the lager the applied load, the lower the friction coefficient and the wear severity.

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A Brief Overview on High Temperature Friction and Wear

STLE/ASME 2010 International Joint Tribology Conference ◽

10.1115/ijtc2010-41297 ◽

2010 ◽

Author(s):

Mustafa Bulut Coskun ◽

Mahmut Faruk Aksit

Keyword(s):

High Temperature ◽

Gas Turbines ◽

Friction And Wear ◽

Oxidation Behavior ◽

Elevated Temperatures ◽

Wear Performance ◽

Large Pressure ◽

Higher Power ◽

Vibratory Motion ◽

Increasing Temperature

With the race for higher power and efficiency new gas turbines operate at ever increasing pressures and temperatures. Increased compression ratios and firing temperatures require many engine parts to survive extended service hours under large pressure loads and thermal distortions while sustaining relative vibratory motion. On the other hand, wear at elevated temperatures limits part life. Combined with rapid oxidation for most materials wear resistance reduces rapidly with increasing temperature. In order to achieve improved wear performance at elevated temperatures better understanding of combined wear and oxidation behavior of high temperature super alloys and coatings needed. In an attempt to aid designers for high temperature applications, this work provides a quick reference for the high temperature friction and wear research available in open literature. High temperature friction and wear data have been collected, grouped and summarized in tables.

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Laser Cladding of Ni-Co-W Composite Coating on Stainless Steel to Enhance Wear Resistance

Materials Science ◽

10.5755/j02.ms.28686 ◽

2021 ◽

Author(s):

Linlin ZHANG ◽

Dawei ZHANG

Keyword(s):

Stainless Steel ◽

Wear Resistance ◽

Composite Coating ◽

Laser Cladding ◽

Composite Coatings ◽

Eutectic Structure ◽

Wear Properties ◽

Fine Grained ◽

Noticeable Improvement ◽

Enhance Wear Resistance

Ni-Co-W composite coatings modified by different contents of Co-based alloy powder in the Ni-based alloy with 35 wt.% WC (Ni35WC) were deposited on stainless steel by laser cladding. The influence of compositional and microstructural modification on the wear properties has been comparatively investigated by XRD, SEM, and EDS techniques. It was found that the austenite dendrites in the modified coating adding 50 wt.% Co-based alloy were refined and a lot of Cr23C6 or M23(C, B)6 compounds with fine lamellar feature were formed around austenitic grain boundaries or in the intergranular regions. The contribution of element Co to the modification of Ni35WC coating is that it cannot only promote the formation of more hard compounds to refine austenite grains, but also refine the size of precipitates, and change the phase type of eutectic structure as a result of disappeared Cr boride brittle phases. A noticeable improvement in wear resistance is obtained in the Ni35WC coating with 50 wt.% Co-based alloy, which makes the wear rate decreased by about 53 % and 30% by comparison to that of the substrate and the Ni35WC coating, respectively. It is suggested that the improvement is closely related to the composite coating being strengthened owing to the increase of coating hardness, formation of a fine-grained microstructure caused by Co, and fine hard precipitate phases in the eutectic structure.

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Tribological Behavior of Ni-Based Self-Lubricating Composites at Elevated Temperatures

Processing Techniques and Tribological Behavior of Composite Materials - Advances in Chemical and Materials Engineering ◽

10.4018/978-1-4666-7530-8.ch003 ◽

2015 ◽

pp. 72-106

Author(s):

Jianliang Li ◽

Dangsheng Xiong ◽

Yongkun Qin ◽

Rajnesh Tyagi

Keyword(s):

High Temperature ◽

Friction And Wear ◽

Solid Lubricant ◽

Elevated Temperatures ◽

Wear Behavior ◽

Composite Coatings ◽

Solid Lubricants ◽

Friction And Wear Behavior ◽

Nickel Base ◽

Self Lubricating Composites

This chapter illustrates the effect of the addition of solid lubricants on the high temperature friction and wear behavior of Ni-based composites. Ni-based composites containing solid lubricant particles both in nano and micrometer range have been fabricated through powder metallurgy route. In order to explore the possible synergetic action of a combination of low and high temperature solid lubricant, nano or micro powders of two or more solid lubricants were added in the composites. This chapter introduces the fabrication of the Ni-based self-lubricating composites containing graphite and/or MoS2, Ag and/or rare earth, Ag and/or hBN as solid lubricants and their friction and wear behavior at room and elevated temperatures. The chapter also includes information on some lubricating composite coatings such as electro-deposited nickel-base coating containing graphite, MoS2, or BN and graphene and their tribological characteristics.

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