Influence of B4C powder reinforcement on coating structure, microhardness and wear in friction surfacing

The problems of changes in the coating structure depending on the composition of the sprayed mechanical mixture using copper particles and mixture of copper and zinc particles (" brass") and the effect of structural factors on the tribological properties of the deposited metal layer are considered. The results of X-ray structural, phase, chemical and durometric analyzes, as well as tribological testing of coatings are presented. It is found that structure with hardness of ≈102.7 HV is formed in the coating from mechanical mixture of particles of copper and aluminum oxide (corundum). Numerous pores are observed in the structure of the deposited metal layer, the main size of which does not exceed 2 μm. In the coating from mechanical mixture of particles copper, zinc and aluminum oxide (corundum), structure is formed based on copper with hardness of ≈106.5 HV, zinc — ≈49.7 HV, intermetallic compounds (γ- and ε-phases) — ≈168.7 HV, the mass fraction of which is 62.0, 7.9 and 24.2 %, respectively. Both coatings can be used in sliding friction pairs.

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Dynamic / Thermochemical Method: A Novel Approach In The Synthesis Of B4c Powder

Open Ceramics ◽

10.1016/j.oceram.2021.100133 ◽

2021 ◽

pp. 100133

Author(s):

Hamza Boussebha ◽

Sinan Bakan ◽

Ali Osman Kurt

Keyword(s):

Novel Approach ◽

Thermochemical Method ◽

B4c Powder

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Recatest—A Technique for Qualitative and Quantitative Assessment of Deferment and Degraded PVD Coatings and CVD Layers in the Deformed Area in the Scratch Test

Materials ◽

10.3390/ma14102625 ◽

2021 ◽

Vol 14 (10) ◽

pp. 2625

Author(s):

Piotr Domanowski ◽

Marek Betiuk

Keyword(s):

Scratch Test ◽

Metallographic Analysis ◽

Tool Steels ◽

Test Device ◽

Coating Structure ◽

Testing Technique ◽

Coating Materials ◽

Qualitative And Quantitative ◽

Quantitative Parameters

The purpose of the paper is to present a new Recatest testing technique which uses a series of abrasions within a scratch and its innovative application to describe selected quantitative parameters of locally, plastically deformed substrate and coating materials detected on the spherical microsection in the scratch test. The exposed material structures are subject to a metallographic analysis which allows for the determination of the quantitative parameters, which in turn allow for a description of the change in dynamics of the coating structure within the scratch area as a function of load. These parameters include scratch depth (hs), coating thickness (h1), flash height (hoc, hos), depth of intended material (hd), material depth under scratch (hcp), and material depth under coating (hdb). The paper also includes a description of the Recalo test device designed by the authors, which is used to make a series of spherical abrasion traces on the scratch surface. Recalo is dedicated to the Recatest technique. The analysed material was the CrN/CrCN/HS6-5-2, AlCrN -Alcrona-Balinit/D2 coatings deposited on tool steels.

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Features of the coating structure with additives of titanium carbonitride nanoparticles and of the 09G2S steel heat affected zone

10.1063/5.0034315 ◽

2020 ◽

Author(s):

Pavel V. Kuznetsov ◽

Nina K. Galchenko ◽

Irina V. Belyaeva

Keyword(s):

Heat Affected Zone ◽

Titanium Carbonitride ◽

Coating Structure ◽

09G2s Steel ◽

Steel Heat

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Microstructure evolution and reaction behavior of Cu–Ni alloy and B4C powder system

Progress in Natural Science Materials International ◽

10.1016/j.pnsc.2020.12.002 ◽

2021 ◽

Author(s):

Lei Jia ◽

Ming-fang Yang ◽

Zhen-lin Lu ◽

Jin Xu ◽

Hui Xie ◽

...

Keyword(s):

Microstructure Evolution ◽

Reaction Behavior ◽

Powder System ◽

Ni Alloy ◽

B4c Powder

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Comprehensive thermo-mechanical simulation of friction surfacing of aluminum alloys using smoothed particle hydrodynamics method

Surface and Coatings Technology ◽

10.1016/j.surfcoat.2021.127274 ◽

2021 ◽

pp. 127274

Author(s):

Hamed Jamshidi Aval

Keyword(s):

Aluminum Alloys ◽

Smoothed Particle Hydrodynamics ◽

Friction Surfacing ◽

Mechanical Simulation ◽

Particle Hydrodynamics ◽

Smoothed Particle ◽

Smoothed Particle Hydrodynamics Method

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Material Application of a Transformer Box: A Study on the Electromagnetic Shielding Characteristics of Al–Ta Coating Film with Plasma-Spray Process

Coatings ◽

10.3390/coatings9080495 ◽

2019 ◽

Vol 9 (8) ◽

pp. 495 ◽

Cited By ~ 2

Author(s):

Fei-Shuo Hung

Keyword(s):

Stainless Steel ◽

Structural Characteristics ◽

Steel Substrate ◽

Pure Aluminum ◽

Multilayer Coating ◽

Thickness Effect ◽

Stress Effect ◽

Coating Film ◽

Coating Structure ◽

Frequency Condition

In this study we present the results of two experiments. In the first one, a Ta–Al–SS (stainless steel (SS)) multilayer coating structure was prepared using plasma spraying equipment to investigate the coating structure and interface properties. In the second one, Ta–Al on multilayer glass was prepared using the sputtering process to measure the thickness effect of thin film on electromagnetic wave shielding (EMI) characteristics and on the design of high-power switchboard covers. According to the experimental results, the multilayer structure of Ta–Al on SS improves the mechanical properties of a stainless steel plate by enhancing the explosion-proof property. An appropriate thickness of the plasma-sprayed pure aluminum layer can increase the adhesion to the stainless steel substrate and buffer the stress effect. After heat treatment (annealing), the Ta–Al–SS multilayer structural characteristics are excellent and suitable for shielding effects at different temperatures and humidity, which can be used as a reference for the engineering application of communication rooms and base power stations. According to EMI test of multi-coated glass (Ta–Al–glass), by increasing the thickness of Ta layer, we cannot effectively improve full-frequency EMI shielding with improved shielding at low-mid frequency condition. In addition, the Ta–Al interface formation of an Al–Ta–O compound layer can improve the adiabatic effect to reduce the thermal conductivity.

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