Hot deformation behavior of 0.5Y2O3/Al2O3-Cu/30Mo3SiC composites doped with reduced graphene oxide

Zhu, Hanjing; Zhou, Meng; Jing, Ke; Tian, Baohong; Zhang, Yi; Li, Xu; Li, Yunzhang; Zheng, Xianhua; Li, Heng; Ma, Zipeng; Liu, Yong; Volinsky, Alex A.; Zou, Jin

doi:10.1016/j.jmrt.2023.09.031

Cited by 4 publications

(2 citation statements)

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Section: Microstructure and Mechanical Propertiesmentioning

confidence: 99%

“…The NiCr alloy is uniformly distributed throughout the bulk in a droplet-like form. Fast hot pressing sintering [29][30][31] enhances the sintering activity of Cr 3 C 2 powder, enabling dense sintering at 1100 • C. Furthermore, the presence of the NiCr alloy phase significantly reduces porosity, resulting in a nearly fully dense block. Given this composite structure, we categorize its hardness into two distinct phases: a ceramic phase primarily composed of Cr 3 C 2 and LaF 3 , and a metal phase primarily constituted of the NiCr alloy.…”

Section: Microstructure and Mechanical Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

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: Microstructure and Mechanical Propertiesmentioning

confidence: 99%

Section: Microstructure and Mechanical Propertiesmentioning

confidence: 99%