scholarly journals RESEARCH OF FEATURE OF STRUCTURE FORMATION IN PTFE-ALUMINUM COMPOSITE MATERIALS DURING SINTERING

2020 ◽  
pp. 42-46
Author(s):  
N. Adamenko ◽  
A. Kazurov ◽  
D. Savin ◽  
G. Agafonova
Keyword(s):  
Composite Materials ◽  
Structure Formation ◽  
Free Volume ◽  
Closed Volume ◽  
Aluminum Composite ◽  
Interfacial Separation ◽  
Lower Porosity ◽  
Static Pressing ◽  
Dispersed Aluminum

The structure formation in fluoroplastic-aluminum composite materials during sintering after static pressing was studied. The concentration of dispersed aluminum was 30% vol.. After sintering, interfacial separation was observed in the fluoroplastic-aluminum composite materials, which is formed during crystallization due to shrinkage, which indicates a low adhesion of the filler to the polymer. Sintering of composite materials in a closed volume leads to the formation of a material with a lower porosity than when sintering in a free volume.

scholarly journals STUDY OF THE STRUCTURE OF HIGHLY FILLED FLUOROPLAST-ALUMINUM COMPOSITES

2020 ◽  
pp. 25-29
Author(s):  
N. A. Adamenko ◽  
A. V. Kazurov ◽  
D. V. Savin ◽  
G. V. Agafonova ◽  
A. S. Ageikin
Keyword(s):  
Structure Formation ◽  
Metal Particles ◽  
Aluminum Composites ◽  
Monolithic Material ◽  
Adhesive Interaction ◽  
Metal Frame ◽  
Static Pressing ◽  
Dispersed Aluminum ◽  
Explosive Pressing

Structure formation in fluoroplastic-aluminum composites obtained by static and explosive pressing has been investigated. The concentration of dispersed aluminum was 50 and 70% vol. In fluoroplastic-aluminum composites, after static pressing, spalling of metal particles, formed during the preparation of a microsection, was found, which indicates low adhesion of the polymer and metal. The production of fluoroplastic-aluminum composites using explosive pressing leads to the formation of a monolithic material with a high adhesive interaction of the components and the formation of a metal frame.

Study of structure formation in aluminum filled polytetrafluoroethylene after explosive compression

2021 ◽  
pp. 26-32
Author(s):  
Nina Adamenko ◽  
Andrej Kazurov ◽  
Dmitry Savin ◽  
Galina Agafonova ◽  
Keyword(s):  
Structure Formation ◽  
Adhesive Bond ◽  
Metal Particles ◽  
Polymer Layer ◽  
Aluminum Fluoride ◽  
Interfacial Separation ◽  
Static Pressing ◽  
Explosive Pressing

The features of the structure formation in polytetrafluoroethylene filled with 10 and 30% (vol.) aluminum after static and explosive pressing have been studied. It was revealed that after static pressing during sintering, interphase separation occured, which is confirmed by the formation of structures of the «closed buds» type. After explosive pressing with sintering, fibrils between polytetrafluoroethylene and aluminum and a polymer layer covering metal particles were found, and there was no interfacial separation that indicates the formation of a strong adhesive bond and is confirmed by the formation of aluminum fluoride.

scholarly journals STUDY OF THE INFLUENCE OF METAL DISPERSITY ON THERMAL EXPANSION OF FLUOROPLAST-ALUMINUM COMPOSITE MATERIALS

2021 ◽  
pp. 26-29
Author(s):  
N. A. Adamenko ◽  
A. V. Kazurov ◽  
D. V. Savin ◽  
G. V. Agafonova ◽  
A. S. Ageikin ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Composite Materials ◽  
Heat Resistance ◽  
Aluminum Concentration ◽  
Aluminum Particles ◽  
Aluminum Composite ◽  
Powder Mixtures ◽  
Static Pressing

The effect of dispersion and concentration of aluminum particles and sintering on the thermal expansion of fluoroplastic-aluminum composite materials has been investigated. Composite materials were obtained by static pressing of powder mixtures, followed by sintering. It was found that a decrease in the size of aluminum particles does not affect heat resistance, but increases thermal expansion and decreases the density of CM. Found that an increase in the aluminum concentration leads to a decrease in the thermal expansion of CMs before sintering and an increase after sintering.

scholarly journals STUDY OF THE INFLUENCE OF ALUMINUM DISPERSION ON THERMAL EXPANSION OF HIGHLY FILLED FLUOROPLASTIC COMPOSITE MATERIALS

2021 ◽  
pp. 38-41
Author(s):  
N. A. Adamenko ◽  
A. V. Kazurov ◽  
D. V. Savin ◽  
G. V. Agafonova ◽  
A. S. Ageikin
Keyword(s):  
Thermal Expansion ◽  
Composite Materials ◽  
Heat Resistance ◽  
Aluminum Concentration ◽  
Aluminum Particles ◽  
Aluminum Composite ◽  
Powder Mixtures ◽  
Static Pressing

The effect of dispersion and concentration of aluminum particles and sintering on the thermal expansion of fluoroplastic-aluminum composite materials has been investigated. Composite materials were obtained by static pressing of powder mixtures of fluoroplastic with 50 and 70% aluminum, followed by sintering. It was found that a decrease in the size of aluminum particles increases thermal expansion and decreases the density of CMs, but does not affect heat resistance. It was found that an increase in the aluminum concentration leads to a decrease in the thermal expansion of CM.

WELDING WITH A MIX OF DISPERSED-HARDENED ALUMINUM COMPOSITE MATERIALS

2020 ◽  
Author(s):  
Антон Михайлович Губин ◽  
Виктор Васильевич Овчинников
Keyword(s):  
Composite Materials ◽  
Friction Welding ◽  
Volume Concentration ◽  
Aluminum Composite ◽  
Sic Nanoparticles ◽  
Dispersed Aluminum ◽  
Rational Range

Установлена возможность применения сварки трением с перемешиванием для получения неразъемных соединений дисперсно-упрочненных алюмоматричных композиционных материалов, армированных наночастицами AlO и SiC. Определен рациональный диапазон параметров режима в зависимости от объемной концентрации упрочняющих частиц. It is possible to use friction welding with mixing to produce non-corrosive compounds of dispersed aluminum composite materials reinforced by AlO and SiC nanoparticles. A rational range of regime parameters is defined depending on the volume concentration of hardening particles.

scholarly journals Particularities of structure formation of aluminum-copper composite materials manufactured by casting technology

2020 ◽  
pp. 116-121
Author(s):  
V. A. Kalinichenko ◽  
A. S. Kalinichenko ◽  
S. V. Grigoriev
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Structure Formation ◽  
Matrix Material ◽  
Matrix Alloy ◽  
Alloying Elements ◽  
Casting Technology ◽  
The Matrix ◽  
Reinforcing Material ◽  
Copper Composite

To create friction pairs operating in severe working conditions, composite materials are now increasingly used. Composite materials obtained with the use of casting technologies are of interest due to the possibility to manufacture wide range of compositions at low price compared to powder metallurgy. Despite the fact that many composite materials have been sufficiently studied, it is of interest to develop new areas of application and give them the properties required by the consumer. In the present work the composite materials on the basis of silumin reinforced with copper granules were considered. Attention was paid to the interaction between the matrix alloy and the reinforcing phase material as determining the properties of the composite material. The analysis of distribution of the basic alloying elements in volume of composite material and also in zones of the interphases interaction is carried out. The analysis of the possibility of obtaining a strong interphase zone of contact between the reinforcing component and the matrix material without significant dissolution of the reinforcing material is carried out.

Analysis of tribological properties of graphite and aluminum composite materials prepared by powder metallurgy technique

2020 ◽  
Vol 10 (5) ◽  
pp. 663-670
Author(s):  
Zhigang Wang ◽  
Jun Li ◽  
Daquan Li
Keyword(s):  
Composite Materials ◽  
Powder Metallurgy ◽  
Friction Coefficient ◽  
Tribological Properties ◽  
Utilization Rate ◽  
Powder Metallurgy Technique ◽  
Aluminum Composite ◽  
Powder Metallurgy Process ◽  
Metallurgy Process ◽  
Composite Samples

In order to make full use of the wear resistance and antifriction of the mixed reinforced particles, improve the performance and utilization rate of the composite material, and reduce its wear amount, in this study, graphite and aluminum composite materials with different graphite concentration were prepared by powder metallurgy process. On this basis, the influence of different graphite concentration on the friction coefficient and wear amount of composite samples and different load on the wear amount of composite materials were discussed and analyzed. The results show that with the increase of graphite content, the friction coefficient and wear amount of the composite will decrease correspondingly. When the load is less than 30 N, the wear curve of the sample changes steadily. When the load is more than 30 N, the wear will increase sharply. Therefore, the analysis of the tribological properties of the graphite and aluminum composites based on the powder metallurgy process plays an important role in improving the utilization rate of the composite and reducing its wear.

scholarly journals Production and wear characteristics of Si-dispersed aluminum composite prepared by powder extrusion.

1987 ◽  
Vol 37 (10) ◽  
pp. 677-682 ◽  
Author(s):  
Tatsuo FUJITA ◽  
Fumio KIYOTA ◽  
Tadao HIRANO ◽  
Yo KOJIMA
Keyword(s):  
Aluminum Composite ◽  
Wear Characteristics ◽  
Dispersed Aluminum

ASME 1992 Nadai Lecture—Micromechanics of Inelastic Composite Materials: Theory and Experiment

1993 ◽  
Vol 115 (4) ◽  
pp. 327-338 ◽  
Author(s):  
George J. Dvorak
Keyword(s):  
Composite Materials ◽  
General Procedure ◽  
Local Fields ◽  
Field Analysis ◽  
Plastic Strains ◽  
Inelastic Behavior ◽  
Aluminum Composite ◽  
Plastic Strain Increment ◽  
Multiphase Materials ◽  
Transformation Field Analysis

Some recent theoretical and experimental results on modeling of the inelastic behavior of composite materials are reviewed. The transformation field analysis method (G. J. Dvorak, Proc. R. Soc. London, Series A437, 1992, pp. 311–327) is a general procedure for evaluation of local fields and overall response in representative volumes of multiphase materials subjected to external thermomechanical loads and transformations in the phases. Applications are presented for systems with elastic-plastic and viscoelastic constituents. The Kroner-Budiansky-Wu and the Hill self-consistent models are corrected to conform with the generalized Levin formula. Recent experimental measurements of yield surfaces and plastic strains on thin-walled boron-aluminum composite tubes are interpreted with several micromechanical models. The comparisons show that unit cell models can provide reasonably accurate predictions of the observed plastic strains, while models relying on normality of the plastic strain increment vector to a single overall yield surface may not capture the essential features of the inelastic deformation process.

502 Characteristic of Strength of CNT/Aluminum Composite Materials

2006 ◽  
Vol 2006 (0) ◽  
pp. 261-262
Author(s):  
Katsuhiko SASAKI ◽  
Terumitsu IMANISHI ◽  
Kazuaki KATAGIRI ◽  
Toyohiro SATOH ◽  
Akiyuki SHIMIZU ◽  
...  
Keyword(s):  
Composite Materials ◽  
Aluminum Composite
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