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.

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.

On corrosion properties of ceramic materials for pump friction pairs in lead – bismuth environment

2019 ◽  
pp. 116-122
Author(s):  
V. V. Stepanov ◽  
A. D. Kashtanov ◽  
S. U. Shchutsky ◽  
A. N. Agrinsky ◽  
N. I. Simonov
Keyword(s):  
Composite Materials ◽  
Heat Resistance ◽  
Experimental Research ◽  
Ceramic Materials ◽  
Operating Conditions ◽  
Metallic Materials ◽  
Corrosion Properties ◽  
Liquid Coolant ◽  
Radial Bearing ◽  
Axial Pump

We consider the results of studies on the choice of material of the lower radial bearing of the pump, designed to circulate the coolant lead – bismuth. The circulation of the liquid coolant is provided by a vertical axial pump having a “long” shaft. In this design it is necessary to provide for the lower bearing the lubrication carried out with lead – bismuth coolant. Having analyzed the operating conditions of the axial pump, we decided to carry out the lower bearing in accordance with the scheme of a hydrodynamic sliding bearing. The materials of friction pairs in such a bearing must withstand the stresses arising from the operation of the pump, as well as the aggressive conditions of the coolant. Non-metallic materials – ceramics and carbon-based composite materials – were selected basing on the study of literature data for experimental research on the corrosion and heat resistance in the lead-bismuth environment. 

Thermal Property Evaluation of Chilled Aluminum-Alumina MMC

2015 ◽  
Vol 1101 ◽  
pp. 79-82
Author(s):  
B.C. Suresh ◽  
S.B. Arun
Keyword(s):  
Thermal Expansion ◽  
Composite Materials ◽  
Thermal Property ◽  
Coefficient Of Thermal Expansion ◽  
Matrix Material ◽  
High Strength ◽  
Stir Casting ◽  
Al Alloy ◽  
Industrial Growth ◽  
Property Evaluation

Now a day’s composite materials are taking very important role in industrial growth. Composite materials are widely used in Automobiles, aerospace, submarine and also in other major fields, due to their special characteristics like light weight, high strength, stiffness, corrosion resistance. The determination of Coefficient of Thermal Expansion (CTE) of MMCs is important to aid its usage in high temperature environment as in the case of automobile combustion chamber. In these applications the stability of the composites over a long period of operation is a critical design considerationPresent work deals with the thermal property evaluation of the Al alloy / alumina metal matrix composite developed using the Stir Casting with chilling route technique. LM 26 Al alloy is being selected as the matrix material as it is a potential alloy for automotive piston applications. Al alloy / alumina MMCs was cast under end chilling technique by dispersing the reinforcement from 6 to 12 wt% the steps of 3% to study the variation in its thermal properties. At the same time chill material is also changed (Copper and MS) for different composition of MMCs cast to study the thermal behavior variations. After casting the required MMC, test specimens were prepared as per the standards to conduct thermal conductivity (K) tests and coefficient of thermal expansion (CTE) tests. Above tests were repeated for different composites containing different weight % of dispersed cast using different chills.

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