Wear Resistance Improvement of Linear Block-Polyurethanes Under Conditions of Liquid Friction

Abstract A significant disadvantage of parts made of linear block polyurethanes under conditions of friction contact in the presence of an aqueous medium is the intensification of hydrolysis processes and decrease in volume strength. It was proposed to slow down the hydrolysis of polyurethanes in three ways: by directed changes in chemical structure, by electromagnetic radiation of different intensities and by creation of composite materials, based on the principle of additional intermolecular crosslinking at the manufacturing and hot processing stages. The conditions for the formation of a smooth wear-resistant surface that protects the material from rapid destruction are revealed.

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INCREASING OF WEAR RESISTANCE OF LINEAR BLOCK-POLYURETHANES BY THERMAL PROCESSING METHODS

MM Science Journal ◽

10.17973/mmsj.2021_10_2021018 ◽

2021 ◽

Vol 2021 (4) ◽

pp. 4731-4735

Author(s):

ANTON PANDA ◽

◽

VOLODYMYR MYKOLAJOVYCH ANISIMOV ◽

VOLODYMYR VOLODYMYROVYCH ANISIMOV ◽

KONSTANTIN DYADYURA ◽

...

Keyword(s):

Wear Resistance ◽

Thermal Processing ◽

Water Medium ◽

Friction Contact ◽

Processing Methods ◽

Thermal Fields ◽

Hydrolysis Process ◽

Linear Block

A significant imperfection of parts made from linear block-polyurethanes under conditions of friction contact in the presence of water medium is an intensification of hydrolysis processes and reduction of bulk strength. In order to slow down the hydrolysis process, samples of the polyurethanes were subjected to three types of thermal impacts: thermal processing during some time, infrared and laser irradiations. It has been established that processing in thermal fields of different intensity allows 5-10 times increase of wear resistance of these materials during friction in water medium.

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The wear resistance increasing of the deposited coatings of the Ni-Cr-B-Si system by modifying them with composite materials synthesized using the SHS process (Self-propagating high-temperature synthesis)

Welding International ◽

10.1080/09507116.2020.1863063 ◽

2021 ◽

pp. 1-6

Author(s):

S.A. Luzan ◽

A.I. Sidashenko ◽

A.S. Luzan

Keyword(s):

Wear Resistance ◽

High Temperature ◽

Composite Materials ◽

Temperature Synthesis ◽

High Temperature Synthesis

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Effects of Alkyl-Substituted Polybenzoxazines on Tribological Properties of Non-Asbestos Composite Friction Materials

Polymers ◽

10.3390/polym13040567 ◽

2021 ◽

Vol 13 (4) ◽

pp. 567

Author(s):

Anun Wongpayakyotin ◽

Chanchira Jubsilp ◽

Sunan Tiptipakorn ◽

Phattarin Mora ◽

Christopher W. Bielawski ◽

...

Keyword(s):

Wear Resistance ◽

Composite Materials ◽

Coefficient Of Friction ◽

Aromatic Amines ◽

Underlying Structure ◽

Methyl Groups ◽

Friction Materials ◽

Wear Rates ◽

Structure Properties ◽

Crosslink Densities

A series of substituted polybenzoxazines was synthesized and studied as binders in non-asbestos friction composite materials. The structures of the polybenzoxazines were varied in a systemic fashion by increasing the number and position of pendant alkyl (methyl) groups and was accomplished using the respective aromatic amines during the polymer synthesis step. By investigating the key thermomechanical and tribological characteristics displayed by the composite materials, the underlying structure-properties relationships were deconvoluted. Composite friction materials with higher thermomechanical and wear resistance properties were obtained from polybenzoxazines with relatively high crosslink densities. In contrast, polybenzoxazines with relatively low crosslink densities afforded composite friction materials with an improved coefficient of friction values and specific wear rates.

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Correlation between wear-resistance and chemical structure of CNx films synthesized by shielded arc ion plating

Surface and Coatings Technology ◽

10.1016/s0257-8972(03)00099-9 ◽

2003 ◽

Vol 169-170 ◽

pp. 336-339 ◽

Cited By ~ 12

Author(s):

Kyung-Hwang Lee ◽

Yasushi Inoue ◽

Hiroyuki Sugimura ◽

Osamu Takai

Keyword(s):

Wear Resistance ◽

Chemical Structure ◽

Arc Ion Plating ◽

Ion Plating ◽

Cnx Films

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A DEVICE AND TOOL FOR MAKING SAMPLE FROM POLYMER COMPOSITE MATERIALS ON A CNC MACHINE (review)

Proceedings of VIAM ◽

10.18577/2307-6046-2021-0-4-100-109 ◽

2021 ◽

pp. 100-109

Author(s):

M.I. Minibaev ◽

◽

M.N. Usacheva ◽

V.S. Dyshenko ◽

V.A. Goncharov ◽

...

Keyword(s):

Wear Resistance ◽

Composite Materials ◽

Carbon Fiber ◽

Sheet Metal ◽

Polymer Composite ◽

Carbon Fiber Reinforced Plastic ◽

Cnc Machine ◽

Fiber Reinforced Plastic ◽

Advantages And Disadvantages ◽

Reinforced Plastic

The article discusses devices for fixing sheet metal blanks from PCM: a perforated vacuum table, its design features, advantages and disadvantages. Based on these data, the upper part of the vacuum table was made for cutting samples for Iosipescu tests and dielectric tests. The article describes various types of tools for PCM processing and an experiment on the wear resistance of a diamond-like coated rasp cutter when milling carbon fiber reinforced plastic, carried out by foreign researchers.

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Research Of The Local Physical And Chemical Structure Of Superthin Layers Of Polymeric Composite Materials Problems And Decisions

Nanostructures, Nanomaterials, and Nanotechnologies to Nanoindustry ◽

10.1201/b16956-21 ◽

2016 ◽

pp. 167-180

Keyword(s):

Composite Materials ◽

Chemical Structure ◽

Polymeric Composite ◽

Polymeric Composite Materials ◽

Physical And Chemical

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THE INFLUENCE OF THE COMPOSITION AND SIZE OF THE FRACTIONS OF THE COMPOSITE GRAVEL FILLER WITH AN EPOXY MATRIX ON ITS WEAR

Tekhnicheskiy servis mashin ◽

10.22314/2618-8287-2021-59-3-100-107 ◽

2021 ◽

Vol 3 (144) ◽

pp. 100-107

Author(s):

Aleksandr M. Mikhal’chenkov ◽

◽

Anna A. Tyureva ◽

Ivan A. Borshchevskiy ◽

Larisa S. Kiseleva

Keyword(s):

Wear Resistance ◽

Composite Materials ◽

Epoxy Matrix ◽

Protective Coatings ◽

Research Purpose ◽

Effective Diameter ◽

Wear Process ◽

The Matrix ◽

Sand And Gravel ◽

Over Time

The widespread use of polymer-based composite materials made it possible to replace expensive metal alloys, increase the strength indicators of structures and improve tribotechnical properties. Their use as protective coatings for structural elements operating in an abrasive environment has yielded good results in increasing wear resistance, which is especially important for parts of tillage tools. (Research purpose) The research purpose is in studying the influence of the composition and size of the fractions of the composite gravel filler with an epoxy matrix on its wear. (Materials and мethods) The article considers five composite materials with different compositions. The prototypes were hollow cylinders with dimensions that provide the contact area necessary for the passage of all processes of abrasive wear. The abrasive composition consisted of a mixture of sand and gravel with a fraction size of about 30-40 millimeters. (Results and discussion) The changes in the wear over time are directly proportional and this confirms the classical views on the wear process. The experiments was conducted on the installation of authors’ design. (Conclusions) The wear over time for experimental composites is the same and is expressed in a straight- line relationship; the maximum wear resistance is a composite in which gravel particles have a size of 2.25 millimeters with its content in the matrix of about 60 mass parts. At the same time, gravel with an effective diameter of 2.25 millimeters creates optimal conditions for self-organization of the wear process and provides a relatively low value of the friction coefficient.

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