Investigation of microstructure, mechanical properties, and high-temperature self-lubrication capacities of CaF2/BaF2 reinforced CoCrFeNiV matrix composites

IF 3.9 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Vacuum Pub Date : 2025-06-19 DOI:10.1016/j.vacuum.2025.114516

Wenxiang Wang , Pengfei Qiu , Shengjie Ye , Xinghua Zhang , Muye Niu , Jun Cheng , Yunxia Guo , Qiuyuan Xie

{"title":"Investigation of microstructure, mechanical properties, and high-temperature self-lubrication capacities of CaF2/BaF2 reinforced CoCrFeNiV matrix composites","authors":"Wenxiang Wang , Pengfei Qiu , Shengjie Ye , Xinghua Zhang , Muye Niu , Jun Cheng , Yunxia Guo , Qiuyuan Xie","doi":"10.1016/j.vacuum.2025.114516","DOIUrl":null,"url":null,"abstract":"<div><div>Due to the rapid degradation of traditional liquid lubricants under extreme service conditions, solid self-lubricating composites have emerged as promising candidates in engineering fields, owing to their ability to operate effectively at temperatures above 400 °C. In this work, a series of high-performance CoCrFeNiV-CaF<sub>2</sub>/BaF<sub>2</sub> solid-lubricating composites were synthesized by vacuum heating-press sintering techniques. The composites showed high hardness of 582.8 ± 8 HV, attributed to the presence of the σ-phase. Tribological tests showed that the BaF<sub>2</sub>/CaF<sub>2</sub> solid lubricant, along with oxide glazing layer on the sliding surface, significantly reduced friction and wear at 600 °C. At 800 °C, the V<sub>2</sub>O<sub>5</sub> in the glazing layer enhanced lubrication, lowering the friction coefficient further. However, its brittle rod-like structure led to higher wear rates. These results indicate that CoCrFeNiV-CaF<sub>2</sub>/BaF<sub>2</sub> self-lubricating composites are excellent wear-resistant materials at medium temperatures.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"240 ","pages":"Article 114516"},"PeriodicalIF":3.9000,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Vacuum","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0042207X25005068","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

Due to the rapid degradation of traditional liquid lubricants under extreme service conditions, solid self-lubricating composites have emerged as promising candidates in engineering fields, owing to their ability to operate effectively at temperatures above 400 °C. In this work, a series of high-performance CoCrFeNiV-CaF₂/BaF₂ solid-lubricating composites were synthesized by vacuum heating-press sintering techniques. The composites showed high hardness of 582.8 ± 8 HV, attributed to the presence of the σ-phase. Tribological tests showed that the BaF₂/CaF₂ solid lubricant, along with oxide glazing layer on the sliding surface, significantly reduced friction and wear at 600 °C. At 800 °C, the V₂O₅ in the glazing layer enhanced lubrication, lowering the friction coefficient further. However, its brittle rod-like structure led to higher wear rates. These results indicate that CoCrFeNiV-CaF₂/BaF₂ self-lubricating composites are excellent wear-resistant materials at medium temperatures.

查看原文本刊更多论文

CaF2/BaF2增强CoCrFeNiV基复合材料显微组织、力学性能及高温自润滑性能研究

由于传统的液体润滑剂在极端使用条件下会迅速降解，固体自润滑复合材料由于能够在400°C以上的温度下有效工作而成为工程领域的有前途的候选者。本文采用真空加热-压制烧结技术合成了一系列高性能CoCrFeNiV-CaF2/BaF2固体润滑复合材料。复合材料的硬度为582.8±8hv，主要归因于σ相的存在。摩擦学试验表明，BaF2/CaF2固体润滑剂以及滑动表面的氧化釉层显著降低了600℃下的摩擦磨损。在800℃时，上釉层中的V2O5增强了润滑，进一步降低了摩擦系数。然而，其脆杆状结构导致较高的磨损率。这些结果表明，CoCrFeNiV-CaF2/BaF2自润滑复合材料是一种优异的中温耐磨材料。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Vacuum 工程技术-材料科学：综合

CiteScore

6.80

自引率

17.50%

发文量

审稿时长

34 days

期刊介绍： Vacuum is an international rapid publications journal with a focus on short communication. All papers are peer-reviewed, with the review process for short communication geared towards very fast turnaround times. The journal also published full research papers, thematic issues and selected papers from leading conferences. A report in Vacuum should represent a major advance in an area that involves a controlled environment at pressures of one atmosphere or below. The scope of the journal includes: 1. Vacuum; original developments in vacuum pumping and instrumentation, vacuum measurement, vacuum gas dynamics, gas-surface interactions, surface treatment for UHV applications and low outgassing, vacuum melting, sintering, and vacuum metrology. Technology and solutions for large-scale facilities (e.g., particle accelerators and fusion devices). New instrumentation ( e.g., detectors and electron microscopes). 2. Plasma science; advances in PVD, CVD, plasma-assisted CVD, ion sources, deposition processes and analysis. 3. Surface science; surface engineering, surface chemistry, surface analysis, crystal growth, ion-surface interactions and etching, nanometer-scale processing, surface modification. 4. Materials science; novel functional or structural materials. Metals, ceramics, and polymers. Experiments, simulations, and modelling for understanding structure-property relationships. Thin films and coatings. Nanostructures and ion implantation.