scholarly journals Surface Hardening of Machine Parts Using Nitriding and TiN Coating Deposition in Glow Discharge

Machines ◽  
2020 ◽  
Vol 8 (3) ◽  
pp. 42
Author(s):  
Alexander Metel ◽  
Sergey Grigoriev ◽  
Yury Melnik ◽  
Marina Volosova ◽  
Enver Mustafaev
Keyword(s):  
Surface Hardening ◽  
Gas Pressure ◽  
Hard Coatings ◽  
Parallel Plates ◽  
Study Results ◽  
Liquid Titanium ◽  
Combined Hardening ◽  
Machine Parts ◽  
Coating Synthesis ◽  
Density Of Electrons

Surface hardening of machine parts substantially improves their performance. The best results are obtained when combined hardening consists of surface nitriding and subsequent deposition of hard coatings. The nitriding of machine parts immersed in the plasma of glow coatings have been studied, and the study results are presented. Titanium atoms for coating synthesis are obtained via titanium evaporation in a hollow molybdenum anode of the discharge. Stable evaporation of titanium occurs only when the power density of electrons heating the liquid titanium does not exceed ~500 W/cm2. To start evaporation, it is only necessary to reduce the gas pressure to 0.02 Pa. To stop evaporation, it is enough to increase the gas pressure to 0.1 Pa. Fast argon and nitrogen atoms used for cleaning the machine parts, heating them, and bombarding the growing coating are obtained using a grid composed of plane-parallel plates under high negative voltage and immersed in plasma.

Theoretical justifi cation for use of combined methods for hardening of surfaces of machine parts in order to control their fretting resistance

2020 ◽  
pp. 339-342
Author(s):  
V.F. Bez’yazychny ◽  
M.V. Timofeev ◽  
R.V. Lyubimov ◽  
E.V. Kiselev
Keyword(s):  
Surface Layer ◽  
Fatigue Limit ◽  
Surface Hardening ◽  
Theoretical Justification ◽  
Hardening Process ◽  
Subsequent Application ◽  
Machine Parts ◽  
Combined Methods

The theoretical justification for the hardening process of the surface layer of machine parts for combined methods of surface hardening with subsequent application of strengthening coatings, as well as reducing or increasing the fatigue limit due to the fretting process is presented.

Technical Support for the Health of the Reducers of Construction Machines on the Basis of Application Device for the Application of Hard Coatings

2019 ◽  
Vol 945 ◽  
pp. 724-728
Author(s):  
O.V. Burlachenko ◽  
V.N. Zlobin ◽  
A.O. Burlachenko
Keyword(s):  
New Technology ◽  
Hard Coatings ◽  
Hard Alloys ◽  
Gear Teeth ◽  
Hard Materials ◽  
Diffusion Coatings ◽  
Hardening Coatings ◽  
Modes Of Processing ◽  
Machine Parts ◽  
Experimental Researches

The new technology of ensuring efficiency of reducers of construction machines is offered. The technology is based on the application of hardening coatings on the contact surface of the gear teeth. To implement the method, the authors developed an installation for applying hardening coatings by ion implantation. Similar devices used for the application of hard materials in the form of diffusion coatings on hot parts of tooling and machine parts are described. It is shown that the proposed installation has a greater technical and economic efficiency compared to existing analogues. The description of the design and operating principle of the proposed device is presented. The results of experimental researches of efficiency of the offered technology are presented. The modes of processing allowing to achieve the maximum indexes of working capacity are picked up. The conducted researches have shown the efficiency of the offered technology for the details from hard alloys.

Improving the Durability of Machine Parts Using a Combined Method

2019 ◽  
Vol 946 ◽  
pp. 37-41 ◽  
Author(s):  
A.P. Yakovleva
Keyword(s):  
Surface Roughness ◽  
Surface Hardening ◽  
Surface Hardness ◽  
Processing Method ◽  
Processing Conditions ◽  
Roughness Parameters ◽  
Combined Method ◽  
Cnc Lathe ◽  
Operational Life ◽  
Machine Parts

A combined processing method for improving the performance features of machine parts (durability), that works under intense wear and high lubricated or boundary friction has been developed; a working installation based on a CNC lathe has been developed. The research on resulting surface hardness material of steels: С45Е; 1.1191 (1 option); SA-240 TP 310S (2 option); 34CrNiMo6, 36CrNiMo4, 40NiCrMo4KD (3 option) and hardening depth variation under different combined processing conditions has been carried out. Surface roughness parameters have been calculated. The suggested method can increase the operational life of a machine part due to improving features, such as surface hardening, creating a favorable surface topography.

Effect determination of operating environments on growth of subfilm corrosion of machine parts with dispersion-filled polymer coatings

2021 ◽  
Vol 0 (8) ◽  
pp. 34-41
Author(s):  
V. A. Gabysheva ◽  
◽  
N. I. Baurova ◽  
Keyword(s):  
Growth Rate ◽  
Polymer Coating ◽  
Polymer Coatings ◽  
Detection Methods ◽  
Good Adhesion ◽  
Organosilicon Polymer ◽  
Operating Environments ◽  
Study Results ◽  
Machine Parts

Detection methods of subfilm corrosion as well as the effect of operating environments on the corrosion growth rate have been examined. The study results of the effect of operating environments on parts with organosilicon polymer coatings modified with various dispersed fillers are presented. It is shown that the addition of mica into the composition of an organosilicon coating make possible to have a protective anticorrosion coating with good adhesion to the metal surface. The effect of operating environments on wettability of the polymer coating surface is described.

Numerical Analysis of Fluid Flow and Heat Transfer of Flow Between Parallel Plates Having Rectangular Shape Micromixer

2017 ◽  
Vol 10 (1) ◽  
Author(s):  
Sudip Shyam ◽  
Aparesh Datta ◽  
Ajoy Kumar Das
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Pressure Drop ◽  
Secondary Flows ◽  
Parallel Plates ◽  
Maximum Enhancement ◽  
Maximum Heat ◽  
Maximum Heat Transfer ◽  
Study Results ◽  
Study Heat Transfer

In this study, heat transfer and fluid flow of de-ionized water in two-dimensional parallel plates microchannel with and without micromixers have been investigated for various Reynolds numbers. The effects of heat transfer and fluid flow on height, diameter of micromixer, and also distance between the two micromixers are carried out in the study. Results showed that the diameter of the micromixer does not have much effect on heat transfer with a maximum enhancement of 9.5%. Whereas heat transfer gets enhanced by 85.57% when the height of the micromixer is increased from 100 μm to 400 μm, and also heat transfer gets improved by 11.45% when sb2 is increased from 4L to 5L. The separation and reattachment zone at the entry and exit of the micromixer cause the increase in heat transfer with the penalty of pressure drop. It is also found that increase of Reynolds number increases the intensity of the secondary flows leads to rapid increase in heat transfer and pressure drop. Finally, the optimized structure of micromixer is found out based on maximum heat transfer and minimum pressure drop.

Combined hardening of the working surface of machine parts

1987 ◽  
Vol 19 (11) ◽  
pp. 1591-1596
Author(s):  
O. I. Zubchenko ◽  
V. B. Margolin
Keyword(s):  
Working Surface ◽  
Combined Hardening ◽  
Machine Parts

Peculiarities of Quality Ensuring in Parts from Ti-Based Alloy VT6 with Ultrafine-Grained Structure

2016 ◽  
Vol 684 ◽  
pp. 440-444
Author(s):  
Eduard Vilardovich Safin ◽  
Anatoliy Mikhailovich Smyslov
Keyword(s):  
Surface Hardening ◽  
High Load ◽  
Ultrafine Grained Structure ◽  
Technological Factors ◽  
Grain Sizes ◽  
Ultrafine Grained ◽  
Average Grain Size ◽  
Machine Parts ◽  
Directed Change

The work analyzes application perspectives of Ti-based alloy VT6 (Ti-6Al-4V) with an ultrafine-grained structure with different grain sizes as structural material to produce high-load machine parts. The paper considers technological factors for ensuring quality of parts with account of assumed conditions of their exploitation, differently directed change of mechanical properties with reduction of an average grain size and choice of surface hardening technique.

scholarly journals Expanding Technological Capabilities of The Combined Hardening of Steel by Deformation

2019 ◽  
Vol 297 ◽  
pp. 05004
Author(s):  
Andrei Kirichek ◽  
Oleg Fedonin ◽  
Dmitry Solovyov ◽  
Svetlana Fedonina
Keyword(s):  
Heat Treatment ◽  
Sliding Friction ◽  
Subsurface Layer ◽  
Chemical Heat Treatment ◽  
Chemical Heat ◽  
The Core ◽  
Wave Deformation ◽  
Deformation Hardening ◽  
Combined Hardening ◽  
Machine Parts

The technology of wave deformation hardening of metal machine parts is described, which allows obtaining a hardened surface layer up to 10 mm deep. The article presents the results of studying the microstructure and hardness of the samples strengthened as a result of chemical heat treatment and combined hardening consisting of preliminary wave deformation hardening and subsequent chemical heat treatment of structural alloyed steel 15CrС2Ni2Mg. It is established that a preliminary impact on the cemented material by a deformation wave contributes to creating uniformly high packing density of martensite, as well as smaller sizes of martensite needles in the subsurface layer and at the border of the cemented layer, in the core of the sample and contributes to the absence of large-needle martensite. Applying this technology allows forming a high uniform hardness at 65 HRC at a depth of 1.5 mm, with its gradual reduction to the core of the sample, while maintaining a high level of toughness. The results obtained allow recommending wave deformation hardening and the combined technology based on it to improve the performance properties of variable machine parts that operate under the conditions of sliding friction and impact loads.

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