Antifriction powder materials for high-speed rubbing pairs

1988 ◽  
Vol 27 (9) ◽  
pp. 703-710 ◽  
Author(s):  
N. G. Baranov
Keyword(s):  
High Speed ◽  
Powder Materials ◽  
Antifriction Powder

scholarly journals RESEARCH OF THE TECHNOLOGY OF OPENING HOLES IN COMPACT AND POWDER MATERIALS

2021 ◽  
Vol 05 (01) ◽  
pp. 51
Author(s):  
Heybet Eldarzade ◽  
Aghali Quliyev ◽  
Aynur Sherifova ◽  
Rafiqa Shahmarova ◽  
Tamilla Xankishiyeva
Keyword(s):  
Cast Iron ◽  
Powder Material ◽  
High Speed ◽  
Small Diameter ◽  
Powder Materials ◽  
Porous Powder ◽  
Small Strains ◽  
Upper Limits ◽  
Antifriction Powder ◽  
Antifriction Powder Material

This article is devoted to one of the important problems of mechanical engineering, including processing by cutting and deploying in sintered antifriction powder material in optimal modes with maximum performance. The study was conducted for small diameter cylindrical bushings. Processing of bushings was carried out by reamers from high-speed and carbide tools on materials from porous powder and cast iron. It is established that the temperature of the tools should not exceed the permissible upper limits, for pressing the bushings, it is necessary to use planting with small strains in the cold state. Keywords: engine valve, bushing, powder material, cast iron, reamer, cold pressing.

Composite cladded powders for spraying of protective coatings

2019 ◽  
pp. 59-64
Author(s):  
E. Yu. Gerashchenkova ◽  
T. I. Bobkova ◽  
E. A. Samodelkin ◽  
B. V. Farmakovsky
Keyword(s):  
Tungsten Carbide ◽  
Gas Phase ◽  
High Speed ◽  
Protective Coatings ◽  
Powder Materials ◽  
Nanosized Particles

The paper presents results of the development of technology for producing cladded and surfacealloyed powder materials. High-speed mechanosynthesis of matrix powders of FeCrAl and solid nanosized particles of tungsten carbide occurs in a disintegrator in the presence of an active gas phase (nitrogen).

scholarly journals Effect of High−Speed Powder Feeding on Microstructure and Tribological Properties of Fe−Based Coatings by Laser Cladding

Coatings ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1456
Author(s):  
Qiang Wang ◽  
Runling Qian ◽  
Ju Yang ◽  
Wenjuan Niu ◽  
Liucheng Zhou ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Laser Cladding ◽  
Tribological Properties ◽  
Wear Mechanism ◽  
High Speed ◽  
High Efficiency ◽  
Adhesive Wear ◽  
Steel Substrate ◽  
Powder Materials ◽  
Powder Feeding

In order to improve the wear resistance of 27SiMn steel substrate, Fe−based alloy coatings were prepared by laser cladding technology in the present study. In comparison to the conventional gravity powder feeding (GF) process, high−speed powder feeding (HF) process was used to prepare Fe−based alloy coating on 27SiMn steel substrate. The effect of diversified energy composition of powder materials on the microstructure and properties of coatings were systematically studied. X−ray diffractometer (XRD), optical microscope (OM) and scanning electron microscope (SEM) were used to analyze the phase structure and microstructure of Fe−based alloy coatings, and the hardness and tribological properties were measured by the microhardness tester and ball on disc wear tester, respectively. The results show that the microstructure of conventional gravity feeding (GF) coatings was composed of coarse columnar crystals. In comparison, owing to the diversification of energy composition, the microstructure of the high−speed powder feeding (HF) coatings consists of uniform and small grains. The total energy of the HF process was 75.5% of that of the GF process, proving that high−efficiency cladding can be achieved at lower laser energy. The refinement of the microstructure is beneficial to improve the hardness and wear resistance of the coating, and the hardness of the HF coating increased by 9.4% and the wear loss decreased to 80.5%, compared with the GF coating. The wear surface of the HF coating suffered less damage, and the wear mechanism was slightly adhesive wear. In contrast, wear was more serious in the GF coating, and the wear mechanism was transformed into severe adhesive wear.

scholarly journals The Analysis of Copper-Iron Metallic Mixture by Means of XRD and XRF

2016 ◽  
Vol 64 ◽  
pp. 130-134 ◽  
Author(s):  
Halo Dalshad Omar
Keyword(s):  
Iron Powder ◽  
High Speed ◽  
Materials Science ◽  
Low Cost ◽  
Powder Materials ◽  
X Ray Diffraction ◽  
X Ray ◽  
Three Samples

The objective of the paper has been given on observations based on studies of the three samples of copper-iron (Cu-Fe) alloy have been prepared from 3gm mass of copper of 99.9 % purity powder and adding 1gm weight of iron powder and adding 1.5gm weight of iron powder. A discussion about simple and low cost preparation of Cu-Fe alloy by Mini Mill 2 Panalytical and preparation of the sample was rotating at 10 min and in case of grinding samples at high speed 300 rpm. Herzog press Panalytical used to produce pressed powder Cu-Fe alloy. The characters of Cu-Fe particles are depending on their size, shape and chemical surroundings. X-Ray Diffraction (XRD) (Model: Panalytical Empyrean) study is most important tool used in powder materials science. For studied three samples the value of (111) plane has the highest value compared to other planes. The spectra obtained were analyzed using X-ray fluorescence (XRF) (Model: Rigaku-NEX CG). From the spectra obtained, there were some elements to be present in the sample were Cu-Fe. The intensity of Cu pure is larger than impurity copper samples analysis by XRD and XRF. Also impurity affects the intensity, (2θ) position and shape of the X-ray spectra.

Spark plasma sintering of WC – 10 Co nanopowders with various carbon content obtained by plasma-chemical method

2020 ◽  
pp. 73-86
Author(s):  
Yu. V. Blagoveshchenskiy ◽  
◽  
N. V. Isaeva ◽  
E. A. Lantsev ◽  
M. S. Boldin ◽  
...  
Keyword(s):  
Activation Energy ◽  
Carbon Content ◽  
Spark Plasma Sintering ◽  
High Speed ◽  
Diffusion Creep ◽  
Powder Materials ◽  
Plasma Chemical ◽  
Colloidal Graphite ◽  
Plasma Sintering ◽  
Spark Plasma

The features of high-speed sintering of WC – Co nanopowders with various contents of excess carbon (colloidal graphite) were studied. To obtain powders, a process was used that included plasma-chemical and low-temperature syntheses and a chemical-metallurgical method of applying ultrathin cobalt layers by precipitation from a solution of salts. The consolidation of powder materials was carried out by the method of high-speed Spark Plasma Sintering. It was found that an increase in the concentration of free carbon (colloidal graphite) has the greatest effect on the shrinkage and sintering rate at the stage of intense shrinkage of WC-Co nanopowders. It is shown that an increase in the carbon content in the composition of nanopowders leads to a decrease in the value of sintering activation energy at the stage of intense shrinkage.It has been established that the process of nanopowder compaction at the intense shrinkage stage is determined by the intensity of the plastic flow and the grain boundary diffusion of cobalt. It is shown that the mechanism of plastic deformation of the γ-phase based on cobalt corresponds to the Coble diffusion creep. It was found that an increase in carbon content leads to decreased in activation energy at the intense shrinkage and does not significantly affect at stage III of sintering where decrease in the shrinkage intensity is observed. It was shown that a decrease in the sintering activation energy is due to a decrease in the tungsten concentration in the γ-phase.

scholarly journals Direct observation of the processes near particle-to-particle contacts at electric pulse consolidation of titanium powder

2019 ◽  
Vol 488 (5) ◽  
pp. 504-507
Author(s):  
A. S. Rogachev ◽  
S. G. Vadchenko ◽  
V. A. Kudryashov ◽  
A. S. Shchukin ◽  
M. I. Alymov
Keyword(s):  
High Speed ◽  
Pulse Heating ◽  
Electric Pulse ◽  
Liquid Phase Sintering ◽  
Powder Materials ◽  
Plasma Sintering ◽  
Electric Current Pulses ◽  
Spark Plasma ◽  
Powder Particles ◽  
Electric Pulse Heating

Direct high-speed micro-video records prove the existence of highly overheated zones at the contacts of powder particles during short (~ 1 ms) electric current pulses. The value of overheating can exceed 1600 degrees and lead to the formation of liquid-phase sintering necks, the dimensions of which are well correlated with the size of the overheated zones. The micro-uniformity of the temperature field in the electric pulse heating allow understanding the unusually high consolidation rates of powder materials observed in spark plasma sintering.

scholarly journals Influence of micropores on structural instability of the combustion wave

2020 ◽  
Vol 15 (4) ◽  
pp. 33-40
Author(s):  
Hong Zhi Cui ◽  
Angelica A. Grigoryevskaya ◽  
Pavel Yu. Gulyaev
Keyword(s):  
Heat Transfer ◽  
Combustion Wave ◽  
High Speed ◽  
Video Recording ◽  
Structural Instability ◽  
Powder Materials ◽  
Porous Powder ◽  
Unstable Combustion ◽  
Adiabatic Combustion Temperature ◽  
The Mathematical Model

The article shows examples of visualization of the process of heat transfer by radiation in unstable combustion modes of porous powder materials, which are in good agreement with the results of high-speed video recording and micropyrometry. The mathematical model and the results of calculating the structure of the combustion wave in the Ni-Al system are presented. The contribution of radiative heat transfer at an adiabatic combustion temperature in the range of 810 % and the effect of its trigger shutdown with decreasing temperature were revealed.

Structurization in sintering of antifriction powder materials based on iron-copper alloys

2007 ◽  
Vol 46 (11-12) ◽  
pp. 589-594 ◽  
Author(s):  
A. G. Kostornov ◽  
O. I. Fushchich ◽  
T. M. Chevichelova
Keyword(s):  
Copper Alloys ◽  
Powder Materials ◽  
Iron Copper ◽  
Antifriction Powder

Structure Formation in Ni Superalloys during High-Speed Direct Laser Deposition

2016 ◽  
Vol 879 ◽  
pp. 978-983 ◽  
Author(s):  
Olga G. Klimova-Korsmik ◽  
Gleb Turichin ◽  
Evgeniy Zemlyakov ◽  
Konstantin Babkin ◽  
Pavel Petrovsky ◽  
...  
Keyword(s):  
High Speed ◽  
New Technologies ◽  
Laser Action ◽  
Mechanical Tests ◽  
Laser Deposition ◽  
Powder Materials ◽  
High Productivity ◽  
Direct Laser Deposition ◽  
Heating And Cooling ◽  
Direct Laser

Additive technologies are replacing the conventional methods of casting and subsequent time-consuming machining because of its high productivity. Resent engineering development in the field of additive manufacturing allows increasing assortment of useful powder materials. Technology of high-speed direct laser deposition (HSDLD) is a one of most perspective new technologies. It allows realizing heterophase process during the manufacturing, which there is process of partial melting of used powder is realized. The product is formed from a metal powder, which is supplied by compressed gas-powder jet directly into the laser action zone, wherein the jet can be as coaxial and as non-coaxial. Ni-based alloys found their application in many industrial areas, mostly there are used engine systems, aircraft and shipbuilding, aeronautics. The unique combination of operational characteristics depending on the type of alloy makes them promising materials. Heating and cooling rates during direct laser deposition determine structure and affect on its properties. Research is focused on structure and phase formation within technological process of HSDLD for Ni-base superalloys. Mechanical tests were carried out on the static tensile test, microhardness was measured. Based on research results the high-speed direct laser deposition technology could be used for manufacturing of products from different Ni-based alloys without subsequent heat treatment.

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