跑合过程引发钛合金水基润滑的超低摩擦特性

doi:10.11901/1005.3093.2020.380

材料研究学报

2021, Vol. 35

Issue (5): 349-356 DOI: 10.11901/1005.3093.2020.380

研究论文

本期目录 | 过刊浏览

跑合过程引发钛合金水基润滑的超低摩擦特性

张会臣(

), 漆雪莲

大连海事大学船舶与海洋工程学院大连 116026

Super Low Friction Characteristics Initiated by Running-in Process in Water-based Lubricant for Ti-Alloy

ZHANG Huichen(

), QI Xuelian

Naval Architecture and Ocean Engineering College, Dalian Maritime University, Dalian 116026, China

引用本文:

张会臣, 漆雪莲. 跑合过程引发钛合金水基润滑的超低摩擦特性[J]. 材料研究学报, 2021, 35(5): 349-356.
Huichen ZHANG, Xuelian QI. Super Low Friction Characteristics Initiated by Running-in Process in Water-based Lubricant for Ti-Alloy[J]. Chinese Journal of Materials Research, 2021, 35(5): 349-356.

全文: PDF(13296 KB) HTML

摘要:

以Ti6Al4V盘和Si₃N₄球为摩擦副、以魔芋葡甘聚糖溶液为润滑剂，使用多功能摩擦磨损试验机对比分析在干摩擦跑合和硼酸跑合条件下钛合金魔芋葡甘聚糖溶液水基润滑的摩擦特性，研究了跑合过程对钛合金水基润滑特性的影响。结果表明：在跑合过程中Si₃N₄球上形成的磨损区域是实现超低摩擦的关键，两种方式跑合后使用魔芋葡甘聚糖溶液润滑均可达到摩擦系数小于0.01的超低摩擦状态。干摩擦跑合后魔芋葡甘聚糖溶液的浓度较高，且在试验转速较高的条件下较强的流体动压效应可实现超低摩擦。硼酸跑合降低了摩擦副表面的粗糙度，且硼酸离子与魔芋葡甘聚糖分子中的羟基发生化学反应生成更加稳定的水合分子层，在魔芋葡甘聚糖溶液浓度较低的条件下依靠水合分子间的斥力仍可实现超低摩擦。

关键词 ：材料表面与界面, 超低摩擦, 跑合, 水基润滑, 钛合金

Abstract：

The influence of running-in process on friction characteristics of Ti-alloy by water-based lubrication process were investigated via CETR universal micro-tribometer (UMT-2) with Ti6Al4V disc and Si3N4 ball as tribo-pairs, konjac glucomannan (KGM) solutions as lubricant. The differences of the lubricating properties for Ti-alloy after dry friction and boric acid running-in process were analyzed. The results show that the wear area on the Si₃N₄ ball generated in the running-in process is the key factor that influenced the achieving of super-low friction. The super-low friction state (friction coefficient less than 0.01) could be acquired with KGM solution after both boric acid running-in and dry running-in. In the case of dry friction running-in, the super-low friction coefficient can be acquired only for the case with higher concentration KGM solutions and higher running speed, which mainly rely on the stronger hydrodynamic effect. In the case of boric acid running-in, the surface roughness of the tribo-pairs were greatly reduced, and the hydration layer of KGM was promoted by the chemical reactions between the boric acid and the KGM molecules. The super-low friction state could be achieved by the repulsive force between the hydrated KGM layers even for the solutions with low concentration of KGM.

Key words： surface and interface in the materials super-low friction running-in process water-based lubrication titanium alloy

收稿日期: 2020-09-08

ZTFLH:

TG142.1

基金资助:国家自然科学基金(51775077)

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https://www.cjmr.org/CN/10.11901/1005.3093.2020.380 或 https://www.cjmr.org/CN/Y2021/V35/I5/349

图1 魔芋蒲甘聚糖的分子结构

图2 干摩擦跑合使用0.5% KGM溶液润滑时的摩擦曲线

图3 干摩擦跑合后Si3N4球上的磨损区域

图4 更换新Si3N4球后的摩擦曲线

图5 使用不同浓度KGM溶液润滑时摩擦系数和对应的膜厚

图6 使用0.1% KGM溶液润滑时的摩擦曲线

表1 不同浓度KGM溶液的粘度

图7 使用不同浓度KGM溶液润滑摩擦系数与转速的关系

图8 使用不同浓度的润滑液钛合金的表面形貌

图9 不同跑合方式下使用0.1%KGM溶液润滑时的摩擦曲线

图10 两种跑合方式下摩擦系数与浓度的关系

图11 不同跑合方式下Si3N4球的表面形貌

图12 不同跑合方式下钛合金表面的SEM照片和EDS分析

图13 KGM和KGM-硼酸的拉曼吸收谱

图14 不同粗糙度条件下的润滑模型

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