The Role of Admixed Solid Lubricants in Sintered Steels

2011 ◽  
pp. 696-702
Author(s):  
A. Liersch ◽  
H. Danninger ◽  
R. Ratzi
Keyword(s):  
Solid Lubricants ◽  
Sintered Steels

scholarly journals Understanding the Unique Role of Phospholipids in the Lubrication of Natural Joints: An Interfacial Tension Study

Coatings ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 264 ◽  
Author(s):  
Aneta D. Petelska ◽  
Katarzyna Kazimierska-Drobny ◽  
Katarzyna Janicka ◽  
Tomasz Majewski ◽  
Wiesław Urbaniak
Keyword(s):  
Interfacial Tension ◽  
Lipid Bilayers ◽  
Solid Lubricant ◽  
Solid Lubricants ◽  
Phospholipid Bilayer ◽  
Low Friction ◽  
Unique Role ◽  
Lamellar Phases ◽  
Chemical Inertness

Some solid lubricants are characterized by a layered structure with weak (van der Waals) inter-interlayer forces which allow for easy, low-strength shearing. Solid lubricants in natural lubrication are characterized by phospholipid bilayers in the articular joints and phospholipid lamellar phases in synovial fluid. The influence of the acid–base properties of the phospholipid bilayer on the wettability and properties of the surface have been explained by studying the interfacial tension of spherical lipid bilayers based on a model membrane. In this paper, we show that the phospholipid multi-bilayer can act as an effective solid lubricant in every aspect, ranging from a ‘corrosion inhibitor’ in the stomach to a load-bearing lubricant in bovine joints. We present evidence of the outstanding performance of phospholipids and argue that this is due to their chemical inertness and hydrophilic–hydrophobic structure, which makes them amphoteric and provides them with the ability to form lamellar structures that can facilitate functional sliding. Moreover, the friction coefficient can significantly change for a given phospholipid bilayer so it leads to a lamellar-repulsive mechanism under highly charged conditions. After this, it is quickly transformed to result in stable low-friction conditions.

scholarly journals The role of phosphorus in pore rounding of sintered steels

2018 ◽  
Vol 5 (1) ◽  
pp. 1452350
Author(s):  
Walid Khraisat ◽  
Wisam Abu Jadayil ◽  
Nathir Rawashdeh ◽  
Henrik Borgström ◽  
Blaza Stojanovic
Keyword(s):  
Sintered Steels

Carbon solid lubricants: role of different dimensions

2020 ◽  
Vol 107 (9-10) ◽  
pp. 3875-3895 ◽  
Author(s):  
Shiwen Wu ◽  
Siyu Tian ◽  
Pradeep L. Menezes ◽  
Guoping Xiong
Keyword(s):  
Solid Lubricants ◽  
Different Dimensions

scholarly journals The Role of Solid Lubricants for Brake Friction Materials

Lubricants ◽  
2016 ◽  
Vol 4 (1) ◽  
pp. 5 ◽  
Author(s):  
Werner Österle ◽  
Andrey Dmitriev
Keyword(s):  
Solid Lubricants ◽  
Friction Materials

The role of metallic stearate additions in solid lubricants

Wear ◽  
1991 ◽  
Vol 148 (1) ◽  
pp. 1-13 ◽  
Author(s):  
V.K. Jain ◽  
D.S. Shukla
Keyword(s):  
Solid Lubricants

Multi-layer Ti3C2Tx-nanoparticles (MXenes) as solid lubricants – Role of surface terminations and intercalated water

2019 ◽  
Vol 494 ◽  
pp. 13-21 ◽  
Author(s):  
Andreas Rosenkranz ◽  
Philipp G. Grützmacher ◽  
Rodrigo Espinoza ◽  
Victor M. Fuenzalida ◽  
Elodie Blanco ◽  
...  
Keyword(s):  
Solid Lubricants

scholarly journals A Focus on Dynamic Modulus: Effects of External and Internal Morphological Features

Metals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 40
Author(s):  
Maria Richetta ◽  
Alessandra Varone
Keyword(s):  
Young’S Modulus ◽  
Dynamic Modulus ◽  
Young's Modulus ◽  
Morphological Features ◽  
Elastic Behavior ◽  
Sintered Steels ◽  
Geometrical Features ◽  
Interconnected Pores ◽  
Low Porosity

The present work examines the effects of external and internal morphological features on the dynamic elastic modulus and its measure. It consists of two parts. The first part considers the effect of geometrical features of probes and shows the key role of roughness as source of a systematic error leading to the underestimation of the Young’s modulus. The second one is focused on the effect of porosity. Several models which consider the porosity as an ideal regular microstructure and the relative equations describing the Young’s modulus vs. porosity have been reviewed and critically discussed. The values of the relative modulus Er predicted by different models are similar for materials with low porosity (p < 0.2) and isolated pores whereas they strongly diverge if p > 0.2 and interconnected pores are present. Moreover, such models fail to describe the elastic behavior of materials correctly also with low porosity (p ≈ 0.1) such as sintered steels in the case of pores with a preferred orientation and an irregular shape.

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