Characterization of Wear Properties of Pure Nickel Modified by Ni-Cr Composite and CaF2 Solid Lubricant Addition

Kotkowiak, Mateusz; Piasecki, Adam

doi:10.3390/ma15217511

Cited by 1 publication

(1 citation statement)

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“…The incorporation of Mo and BaF 2 resulted in a remarkably low friction coefficient of 0.27 at 900 • C [17]. Kotkowiak and co-workers fabricated a nickel-based composite containing 20% CaF 2 using powder metallurgy and conducted a comprehensive study on the lubrication mechanism of CaF 2 at temperatures ranging from 200 to 600 • C [18]. Su et al produced an Ag-BaF 2 •CaF 2 -Cr 3 C 2 -NiCr composite coating through high-velocity oxygen fuel (HVOF) spraying.…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Tribological Behavior of Fast-Hot-Pressed NiCr/Cr3C2-LaF3 Self-Lubrication Composite

Yang,

Huang,

et al. 2024

Crystals

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This article details a method for preparing cermet matrix composites via Fast hot pressing (FHP) sintering technology and emphasizes their potential use in extremely high-temperature settings. The material primarily consists of NiCr alloy, Cr3C2, and LaF3. An in-depth investigation was conducted on the tribological properties of the specimen by conducting sliding tests against a Si3N4 ball at varying temperatures, including room temperature (RT), 400 °C, 600 °C, and 800 °C. Advanced techniques such as scanning electron microscopy, micro-XRD, and micro-Raman spectroscopy were employed to examine the friction surfaces formed under different frictional temperatures. The findings reveal a uniform composition and high density within the composites. It is noteworthy that as the LaF3 content increases, the hardness of the ceramic phase diminishes. Conversely, the hardness of the alloy phase augments with the addition of LaF3, provided that its content remains below 15 wt%. The composite material containing 15 wt% LaF3 demonstrates superior hardness values, with the ceramic phase reaching HV1412 and the alloy phase achieving HV384. Furthermore, the coefficient of friction of the composite material was evaluated. The coefficient of friction of the composite is between 0.74 and 0.4 and the wear rate is 4.46 × 10−6–5.72 × 10−5 mm3N−1m−1 from room temperature to 800 °C. The lubrication behavior at low temperature is mainly attributed to the lubricating effect of LaF3, and at high temperature it is due to the tribochemical reaction to form LaCrO3 with good lubricating properties, which plays a synergistic lubricating role with Cr2O3.

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Section: Introductionmentioning

confidence: 99%