文章信息/Info

Title:

Lubrication and Failure Mechanism of MoS2-based Bonded Solid Lubricating Coatings on Zirconium Alloy Surface

文章編號:

1674-3962(2021)11-0911-06

作者:

高原1; 2; 王一童1; 王慶娟1; 王偉1; 王巖1; 王強(qiáng)1

（1.西安建筑科技大學(xué)冶金工程學(xué)院，陜西 西安 710055）（2.清華大學(xué) 摩擦學(xué)國家重點(diǎn)實(shí)驗(yàn)室，北京 100084）

Author(s):

GAO Yuan1; 2; WANG Yitong1; WANG Qingjuan1;  WANG Wei1; WANG Yan1; WANG Qiang1

(1. School of Metallurgy Engineering，Xi’an University of Architecture and Technology，Xi’an 710055，China) (2. State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China)

關(guān)鍵詞:

MoS2; 粘結(jié)固體潤滑涂層; 潤滑性能; 磨損機(jī)制; 高溫摩擦

Keywords:

MoS2;  bonded solid lubricating coating;  lubricating properties;  wear mechanism;  high temperature friction

分類號:

TG174.44

DOI:

10.7502/j.issn.1674-3962.202007003

文獻(xiàn)標(biāo)志碼:

A

摘要:

鋯合金擠壓作為核燃料元件生產(chǎn)的關(guān)鍵工藝，面臨傳統(tǒng)潤滑方式難以滿足要求的問題，需要對擠壓潤滑劑的潤滑性能和失效形式進(jìn)行系統(tǒng)性研究。在鋯合金表面制備了耐高溫MoS2基粘結(jié)固體潤滑涂層，用高溫球�脖P試驗(yàn)機(jī)模擬研究了涂層在熱擠壓試驗(yàn)時的潤滑性能，用掃描電鏡和三維光學(xué)數(shù)碼顯微鏡分析了涂層摩擦后的表面形貌以及磨痕表面和截面形貌，用能譜儀分析了高溫下涂層中粘結(jié)劑及潤滑顆粒成分的變化，用拉曼光譜分析了磨痕處涂層成分的變化。涂層在400和600 ℃短時保溫（10 min）后摩擦表現(xiàn)出優(yōu)良的潤滑性能，其摩擦系數(shù)均在0.05左右，這歸因于MoS2在高溫條件下依舊保持優(yōu)良的層狀結(jié)構(gòu)，在高溫強(qiáng)載荷下基本未發(fā)生摩擦化學(xué)現(xiàn)象；但是在600 ℃保溫60 min后，涂層內(nèi)MoS2由于長時間保溫而氧化失效，潤滑性能大幅度降低。根據(jù)MoS2基粘結(jié)固體潤滑劑不同使用溫度及保溫時間，探究以MoS2為主要潤滑成分的潤滑劑在高溫強(qiáng)載荷條件下的潤滑性能及失效形式，為MoS2基粘結(jié)固體潤滑涂層在金屬塑性加工領(lǐng)域的應(yīng)用提供了理論依據(jù)。

Abstract:

Zirconium alloy extrusion is the key process for producing nuclear fuel components, and traditional lubrication methods already can’t meet the process and property request. Therefore, systematic research on the lubricating properties and failure modes of extrusion lubricants is needed. In this work, the heat-resistant MoS2-based bonded solid lubricating coating was prepared on the surface of zirconium alloy. Lubricating properties of the coating under hot extrusion conditions were studied by high-temperature ball-on-disk tribological tester. Surface morphology and microstructure of the coatings and wear tracks were analyzed by SEM and 3D optical digital microscope, the change of binder and lubricant particles in the coating at high temperatures was analyzed by EDS, the change of the coating composition at the wear tracks was analyzed by Raman spectroscopy. The coating has excellent lubricating property at high-temperature tribological test after holding at 400 and 600 ℃ for 10 min, and its friction coefficient is all about 0.05. This is attributed to the fact that MoS2 still maintains an excellent layered structure at high temperatures, and there is no friction chemical phenomenon under high temperature and strong load. However, after holding at 600 ℃ for 60 min, MoS2 is oxidized and failed because of a long time heat preservation, the lubrication property is greatly reduced. In this work, considering heating temperature and holding time of the extrusion process, the lubricating properties and failure modes of MoS2-based bonded solid lubricants under high temperature and strong load condition were investigated, which may provide theoretical basis for metal forming.