scholarly journals Design and technological provision of wear resistance of elastomer surface of rubber-cord casings of damping devices

2021 ◽  
pp. 25-28
Author(s):  
V. G. Churankin ◽  
◽  
A. V. Lyamtsev ◽  
V. V. Derkach ◽  
◽  
...  
Keyword(s):  
Wear Resistance ◽  
Chemical Composition ◽  
Shock Absorber ◽  
Sliding Friction ◽  
Rolling Friction ◽  
Solid Base ◽  
Cover Layer ◽  
Deformation Component ◽  
Main Factors ◽  
Pneumatic Shock

Two main factors are considered that determining the friction between non-lubricated surfaces of an elastomer and a solid base during their relative motion. The first one is adhesion in the areas of real (actual) catalysis and the second factor is the deformation component, which is due to the delay of recovery of the elastomer after the irregularity is introduced and it is called the hysteresis component of friction. One of the main problems of increasing the resource of pneumatic dampers is minimizing the wear of the covering layer of the rubber-cord casing (RCC). The wear of the RCC is due to the fact that sliding friction occurs in the process of contact between the metal surface and the surface of the RCC, as a result of which the cover layer of the RCC (in some cases with the first cord layer) wears out, depending on the chemical composition of the rubber and the features of the operation of the pneumatic shock absorber. In order to minimize the wear of rubber, it is proposed to change the design of the pneumatic damper so that rolling friction dominates in the contact between the surfaces of rubber and metal

scholarly journals Selection of the chemical composition of steels and their thermal hardening mode using a computer program

2021 ◽  
pp. 59-65
Author(s):  
D. M. Berdiev ◽  
M. A. Uмаrоvа ◽  
A. A. Yusupov
Keyword(s):  
Wear Resistance ◽  
Chemical Composition ◽  
Computer Program ◽  
Sliding Friction ◽  
Thermal Hardening ◽  
Abrasive Particles ◽  
Density Of Dislocations ◽  
Heat Treated ◽  
Final Tempering ◽  
Selection Of

The relationships between the parameters of the structure of heat‑treated steels and their abrasive wear resistance are established. At all temperatures of the final tempering of hardened steel, there is a direct relationship between its structure parameters (the number of elements in a solid solution, the density of dislocations, the size of cementite particles and the intercementite distance) and wear resistance when sliding friction against loose abrasive particles. A computer program has been developed to select the chemical composition of the steel grade and methods of thermal hardening in order to ensure the required wear resistance.

Effect of n-Na2B4O7 Additive on Tribological Performances of Ion Nitrocarburized Layer

2015 ◽  
Vol 1120-1121 ◽  
pp. 254-259
Author(s):  
Chun Hua Hu ◽  
Hai Jiang ◽  
Yun Feng Du ◽  
Hai Peng Wang ◽  
Zhi Chang Deng
Keyword(s):  
Wear Resistance ◽  
Friction Surface ◽  
Sliding Friction ◽  
Synergetic Effect ◽  
Rolling Friction ◽  
Friction Reduction ◽  
Solid Lubrication ◽  
Higher Temperature ◽  
Different Content ◽  
Nitrocarburized Layer

The paper studied the effect of n-Na2B4O7additives of different content on tribological performances of the ion nitrocarburized layer. It is found that 7% n-Na2B4O7additive can improve greatly the friction reduction and wear resistance of the ion nitrocarburized layer under different conditions. This because that synergetic effect of friction reduction and wear resistance is produced between n-Na2B4O7additive and ion nitrocarburized layer under higher temperature, frequence and load, and the chemical reaction films including oxide, nitride, BN, and sulphide and so on formed on the friction surface play the solid lubrication function, and the n-Na2B4O7particles on the friction surface play the "Micron nanobearing" function, translating the sliding friction into the rolling friction, which can make the ion nitrocarburized layer possess the excellent tribological performances.

Wear Resistance of Graphitized Steels

2013 ◽  
Vol 58 (3) ◽  
pp. 813-816 ◽  
Author(s):  
S. Byelikov ◽  
I. Volchok ◽  
I. Akimov
Keyword(s):  
Weight Loss ◽  
Wear Resistance ◽  
Copper Content ◽  
Sliding Friction ◽  
Metal Base ◽  
Factors Affecting ◽  
Heat Treated ◽  
Main Factors ◽  
Object Of Study ◽  
Graphite Inclusions

Abstract Heat-treated graphitized steels with different carbon, silicon and copper contents have been the object of study. The influence of the composition on the structure and wear resistance (weight loss of the specimen) of graphitized steels (after hardening and tempering) under the conditions of metal to metal dry sliding friction with the use of Amsler-type friction machines, has been investigated in this work. Research results have shown that the main factors affecting wear resistance of graphitized steels have been not only their metal base hardness, but the quantity, shape and distribution of graphite inclusions uniformity in the structure of such steels as well. A regression dependence of the quantity of specimen’s weight loss on carbon, silicon and copper content has been obtained in the work. The highest wear resistance was pertained by the steel having the following content: 1.60. . . 1.70%C; 2.20. . . 2.30%Si; 0.80. . . 0.90%Cu; 0.60. . . 0.70%Mn; 0.15. . . 0.18%Cr; 0.22. . . 0.25%Al; up to 0.015%S and 0.024%P.

WEAR RESISTANCE OF STRUCTURAL STEELS AS A RESULT OF BORONISING OPERATIONS

Tribologia ◽  
2018 ◽  
Vol 278 (2) ◽  
pp. 37-44 ◽  
Author(s):  
Elżbieta KALINOWSKA-OZGOWICZ ◽  
Klaudiusz LENIK ◽  
Sylwester KORGA
Keyword(s):  
Wear Resistance ◽  
Chemical Composition ◽  
Sliding Friction ◽  
Isothermal Holding ◽  
Thermochemical Treatment ◽  
Thickness Measurement ◽  
Structural Steels ◽  
Potassium Chromate ◽  
Quench Hardening ◽  
Friction Method

This paper presents the results of investigations on the effect of thermochemical treatment, boronising and chemical composition of selected structural steels on their wear in sliding friction process. The operation of boronising on C45, 37CrNiMo, 42CrMo6, 41Cr4, 50CrSi4-4 steels was performed by powder method at 950°C for 8 h. Following this operation, rod sections of the test steels were subjected to quench hardening from 850°C with isothermal holding at 300°C for 1h. The assessment of the construction, thickness and microhardness of boronised layers depending on the level of carbon and alloying elements in chemical composition of analysed steels was made. The testing for wear resistance of steels after boronising was carried out with the sliding friction method by applying a load of 150 N, counter-sample rotational speed of 1000 rpm and using aqueous solution of potassium chromate as a cooling medium. The metallographic observations of the structure and thickness measurement of the boronised layers were carried out using a light microscope, while the identification of phases was made by the X-ray qualitative analysis method. The hardness and microhardness measurements were taken by the Vickers method.

KAISER ALUMINUM ALLOY 4026

Alloy Digest ◽  
2003 ◽  
Vol 52 (10) ◽  
Keyword(s):  
Wear Resistance ◽  
Aluminum Alloy ◽  
Physical Properties ◽  
Tensile Properties ◽  
Sliding Friction ◽  
High Strength ◽  
Heat Treating ◽  
Kaiser Aluminum ◽  
Friction Resistance

Abstract Kaiser Aluminum alloy 4026 has high strength and good wear resistance, as well as galling resistance. It was developed for sliding friction resistance. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on heat treating. Filing Code: AL-385. Producer or source: Tennalum, A Division of Kaiser Aluminum.

The Chemical Decontamination Process Intensification, using Ultrasounds

2008 ◽  
Vol 59 (9) ◽  
Author(s):  
Eugenia Pantru ◽  
Gheorghit Jinescu ◽  
Rozalia R�dulescu ◽  
Antoneta Filcenco Olteanu ◽  
Cosmin Jinescu
Keyword(s):  
Chemical Composition ◽  
Process Intensification ◽  
Sulphuric Acid Solution ◽  
Liquid Ratio ◽  
Polluted Soils ◽  
Chemical Decontamination ◽  
First Case ◽  
Ultrasound Field ◽  
Different Types ◽  
Main Factors

This paper presents an intensive procedure used for the decontamination of the soils, which were radioactively contaminated by uranium, due to the occurrence of some antropic accidents, in order to limit the area�s pollution. The procedure used for the chemical decontamination of the polluted soils was the washing one and the decontamination degree is comparatively presented depending on the ultrasounds� presence and absence. The lab testes were performed on five types of soils , which were characterized from the granulometric, structural and chemical composition viewpoint, all these aspects represent the main factors, which determine the applied decontamination procedure�s limits and performances correlated with its utilization costs. The decontamination procedure�s kinetics for each type of soils was analyzed, using successively three different types of reagents (water, 0.1 M sulphuric acid solution and chloro-sodic solution � 100 g/L sodium chloride + 10 g/L sodium carbonate in water) for a solid to liquid ratio of 1:2, during 2 h, at a temperature of 20oC in a mechanic stirring system respectively in ultrasounds field. It was observed that the decontamination degree increases with up to 15-20% in case of the ultrasound field utilization comparing to the first case.

The Brake Device Design for Children Two-Wheel Dynamic Scooter

2011 ◽  
Vol 421 ◽  
pp. 724-727
Author(s):  
Xue Feng Yi ◽  
Li Jun He
Keyword(s):  
Sliding Friction ◽  
Rolling Friction ◽  
Safety Performance ◽  
Device Design ◽  
Emergency Braking ◽  
Design For Children ◽  
Brake Device

Children scooter safety performance is not good enough in the market, the cause of the majority of injuries to children is difficult to control the speed or emergency braking. According to the phenomenon, this paper focuses on designing dynamic scooter brake device for 8-10 child, we conceive that the brake device is given the force of the rolling friction and the sliding friction, so it can play a dual brake effect. It will enhance the security and stability of children dynamic scooter.

Multiple Reflow Influence over the FeCoCrAlTiCuNiMo Coating Obtained by Plasma Metallization on its Wear Resistance under Dry Friction

2021 ◽  
Vol 410 ◽  
pp. 475-481
Author(s):  
Anvar M. Kadyrmetov ◽  
Dmitri A. Popov ◽  
Yevgeny V. Snyatkov
Keyword(s):  
Wear Resistance ◽  
Dry Friction ◽  
Sliding Friction ◽  
Plasma Jet ◽  
Dry Sliding ◽  
Research Results ◽  
Open Atmosphere ◽  
Multicomponent Coating ◽  
Dry Sliding Friction

The article presents the research results of the plasma jet multiple reflow effect over the multicomponent coating FeCoCrAlTiCuNiMo, obtained by plasma metallization in an open atmosphere, on its wear resistance under dry sliding friction. The research results indirectly confirm the influence of the coating entropy over the wear resistance increasing along of the reflow number growth.

Performance characteristics of steel 1.2842 after nitridation

2021 ◽  
Vol 16 (1) ◽  
pp. 43-48
Author(s):  
Michal Krbaťa ◽  
◽  
Jana Escherová ◽  
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Wear Resistance ◽  
Chemical Composition ◽  
Plasma Nitriding ◽  
Cutting Tools ◽  
Operating Costs ◽  
Mechanical And Tribological Properties ◽  
Structure Thickness ◽  
Pin On Disc

The paper deals with the change in mechanical properties and wear of 1.2842 universal tool steel after plasma nitriding, which is widely used to produce cutting tools with good durability and low operating costs. Plasma nitriding was performed at a temperature of 500 °C for 10-hour period in a standard N2 /H2 atmosphere with 1:3 gases ratio. Microstructure, phase structure, thickness of a nitriding layer and surface roughness of samples were measured with optical microscopes and a profilometer. Verification of a chemical composition was carried out on the BAS TASMAN Q4 device. Wear resistance was measured on a universal TRIBOLAB UTM 3 tribometer, through a, “pin on disc“ method. The results of experiments have shown that plasma nitriding process, significantly improves the mechanical and tribological properties of selected materials.

Analysis of Wear-Resistant Materials of Mixer - Pneumosuperchargers Blades Operating under Conditions of Abrasive Wear

2021 ◽  
Vol 316 ◽  
pp. 893-898
Author(s):  
Natalya Gabelchenko ◽  
Artem Belov ◽  
Artem Kravchenko ◽  
Oleg Kryuchkov
Keyword(s):  
Mechanical Properties ◽  
Weight Loss ◽  
Wear Resistance ◽  
Chemical Composition ◽  
Abrasive Wear ◽  
Abrasive Medium ◽  
Wear Resistant ◽  
Comparative Tests ◽  
Before And After ◽  
110G13l Steel

We conducted comparative tests of the wear resistance of metals operating under abrasive conditions. Samples were cut from the working parts of mixer-pneumosuperchargers. The chemical composition and mechanical properties were determined. To compare samples under abrasive wear conditions, we designed and assembled a carousel installation. The principle of its operation is based on mixing the abrasive medium by the samples being studied with a given speed. Wear resistance was evaluated by weight loss by samples after several test cycles. To determine changes in the structure of the metal during abrasive wear, metallographic studies of the samples were carried out before and after the tests. It is shown that the best complex of service and mechanical properties is possessed by 110G13L steel.

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