The Structure and Properties of NBR / Recycled Polytetrafluoroethylene (R-PTFE) Composites

2014 ◽  
Vol 983 ◽  
pp. 152-155
Author(s):  
Wen Wen Chen ◽  
Chang Lin Cao ◽  
Yi Zhang ◽  
Li Ren Xiao ◽  
Qing Rong Qian ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Structure And Properties ◽  
Solvent Resistance ◽  
Properties Of Materials ◽  
Ptfe Composites ◽  
Positive Effect

The structure and properties of NBR and its composites coupled with different particle size of recycled polytetrafluoetylene (R-PTFE) are investigated. The results show that R-PTFE has a positive effect on NBR enhancing the curing properties of materials, mechanical properties, solvent resistance of NBR when the particle size of R-PTFE less than 200 mesh. However, when it is 200 mesh, R-PTFE is not easily dispersed in the NBR matrix, resulting in decreasing the properties of NBR/R-PTFE composites.

Engineering Structure and Properties of Materials Used as a Matrix in Diamond Impregnated Tools / Kształtowanie Struktury I Własnosci Materiałów Stosowanych Jako Osnowa W Narzedziach Metaliczno-Diamentowych

2013 ◽  
Vol 58 (1) ◽  
pp. 5-8 ◽  
Author(s):  
J. Borowiecka-Jamrozek
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Structure And Properties ◽  
Hot Press ◽  
Properties Of Materials ◽  
The Mean ◽  
Materials Used ◽  
Hot Press Process ◽  
Scanning Electron ◽  
And Tungsten

The paper presents mechanical properties of materials used as matrices in diamond impregnated tools. Several powder metallurgy materials were manufactured by the hot press process from various combinations of cobalt (Co SMS, Co Extrafine, Co 400mesh), carbonyl iron (Fe CN) and tungsten (WP30) powders. After consolidation the specimens were tested for density, hardness and tensile properties. The fracture surfaces and materials’ microstructure were observed using the Jeol JSM- 5400 scanning electron microscope and the Leica DM4000 light microscope. The main objective of the work was to determine the effects of the mean particle size of cobalt as well as additions of iron and tungsten on properties of the as-consolidated material.

Study on Effect of Particle Size of Matrix and Reinforcement on Properties of Iron Matrix Composites

2012 ◽  
Vol 182-183 ◽  
pp. 328-331
Author(s):  
Yu Fang Yang ◽  
Kang Ju Li
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Matrix Composites ◽  
Hot Press ◽  
Iron Matrix ◽  
Direct Heating ◽  
Effect Of Particle Size ◽  
Properties Of Materials ◽  
Hot Press Sintering ◽  
Properties Of Composites

The effect of particle size of iron and size of reinforce particle on properties of materials was studied systematically by the specimen current direct heating dynamic hot press sintering. It is found that mechanical properties of composites increase with the increasing particle size of iron. The properties of SiCp/Fe composites firstly increase and decrease with particle size of SiC and properties are better when size is 15μm.

scholarly journals Investigation on Mechanical Properties and Reaction Characteristics of Al-PTFE Composites with Different Al Particle Size

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Jia-xiang Wu ◽  
Xiang Fang ◽  
Zhen-ru Gao ◽  
Huai-xi Wang ◽  
Jun-yi Huang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
High Speed ◽  
Structural Characteristics ◽  
Testing Machine ◽  
Strain Rate Range ◽  
Drop Weight ◽  
Hardening Modulus ◽  
Reaction Characteristics ◽  
Ptfe Composites

Al-PTFE (aluminum-polytetrafluoroethylene) serves as one among the most promising reactive materials (RMs). In this work, six types of Al-PTFE composites with different Al particle sizes (i.e., 50 nm, 1∼2 μm, 6∼7 μm, 12∼14 μm, 22∼24 μm, and 32∼34 μm) were prepared, and quasistatic compression and drop weight tests were conducted to characterize the mechanical properties and reaction characteristics of Al-PTFE composites. The reaction phenomenon and stress-strain curves were recorded by a high-speed camera and universal testing machine. The microstructure of selected specimens was anatomized through adopting a scanning electron microscope (SEM) to correlate the mesoscale structural characteristics to their macroproperties. As the results indicated, in the case of quasistatic compression, the strength of the composites was decreased (the yield strength falling from 22.7 MPa to 13.6 MPa and the hardening modulus declining from 33.3 MPa to 25 MPa) with the increase of the Al particle size. The toughness rose firstly and subsequently decreased and peaked as 116.42 MJ/m3 at 6∼7 μm. The reaction phenomenon occurred only in composites with the Al particle size less than 10 μm. In drop weight tests, six types of specimens were overall reacted. As the Al particle size rose, the ignition energy of the composites enhanced and the composites turned out to be more insensitive to reaction. In a lower strain rate range (10−2·s−1∼102·s−1), Al-PTFE specimens take on different mechanical properties and reaction characteristics in the case of different strain rates. The formation of circumferential open cracks is deemed as a prerequisite for Al-PTFE specimens to go through a reaction.

Structure and Properties of Cobaltous Chloride/Polyvinyl Alcohol-Glutaraldehyde(CC/PVA-GA) Reversible Thermochromic Microcapsule

2012 ◽  
Vol 501 ◽  
pp. 231-236 ◽  
Author(s):  
Jie Gao ◽  
Ping Guan ◽  
Xiao Ling Hu ◽  
Mei Cao
Keyword(s):  
Electron Microscopy ◽  
Particle Size ◽  
Polyvinyl Alcohol ◽  
Interfacial Polymerization ◽  
Water Phase ◽  
Structure And Properties ◽  
Multiple Emulsion ◽  
Solvent Resistance ◽  
Cobaltous Chloride ◽  
External Water

The low-temperature reversible thermochromic microcapsules was prepared by interfacial polymerization, which an aqueous phase containing CoCl2 was used as the internal water phase (W1), cyclohexane was used as the oil phase (O), polyvinyl alcohol was used as the external water phase (W2) to form the uniform W1/O/W2 multiple emulsion. The structures of microcapsules were investigated using infrared spectrum (IR), electron microscopy (SEM) and polarization microscope. The properties of microcapsules, such as thermochromism and solvent resistance were also investigated. The results presented that the particle size of capsules was uniform, their walls were transparency, and the microcapsules were provided with excellent sensitivity to heat, reversibility and solvent resistance.

scholarly journals Structure and Properties of Materials on the Basis of Ag-Pb-Sb-Te with High Thermоelectric Figure of Merit

2016 ◽  
Vol 17 (1) ◽  
pp. 114-128
Author(s):  
I.V. Horichok ◽  
L.I. Nykyruy ◽  
T.O. Semko ◽  
M.A. Lopуanko ◽  
O.L. Sokolov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermoelectric Materials ◽  
Figure Of Merit ◽  
Thermoelectric Figure Of Merit ◽  
Structure And Properties ◽  
Thermoelectric Figure ◽  
Highly Efficient ◽  
Properties Of Materials ◽  
Thermoelectric Converters

The review of works devoted to the study of thermoelectric, thermodynamic and mechanical properties of highly efficient thermoelectric materials in the system Ag-Pb (Sn) -Sb-Te. It is shown that based on them can be obtained as n-, and district branches of thermoelectric converters with parameter dimensionless thermoelectric figure of merit ZT ≈ 1.5 - 2.0.

LABORATORY TESTS OF THE PHYSICAL-MECHANICAL PROPERTIES OF MATERIALS FOR REMEDIAL JOBS

2020 ◽  
pp. 58-63
Author(s):  
M.A. Druzhinin ◽  
◽  
G.V. Okromelidze ◽  
O.V. Garshina ◽  
I.A. Kudimov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Laboratory Tests ◽  
Mechanical Properties Of Materials ◽  
Properties Of Materials

Structure and properties of compact articles from high-alloyed iron powder with adding of boron nitride

2020 ◽  
pp. 39-48
Author(s):  
B. O. Bolshakov ◽  
◽  
R. F. Galiakbarov ◽  
A. M. Smyslov ◽  
◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Boron Nitride ◽  
Grain Boundary ◽  
Bending Strength ◽  
Physical And Mechanical Properties ◽  
Operating Conditions ◽  
Structure And Properties ◽  
Steam Turbines ◽  
Friction Forces ◽  
Wide Range

The results of the research of structure and properties of a composite compact from 13 Cr – 2 Мо and BN powders depending on the concentration of boron nitride are provided. It is shown that adding boron nitride in an amount of more than 2% by weight of the charge mixture leads to the formation of extended grain boundary porosity and finely dispersed BN layers in the structure, which provides a high level of wearing properties of the material. The effect of boron nitride concentration on physical and mechanical properties is determined. It was found that the introduction of a small amount of BN (up to 2 % by weight) into the compacts leads to an increase in plasticity, bending strength, and toughness by reducing the friction forces between the metal powder particles during pressing and a more complete grain boundary diffusion process during sintering. The formation of a regulated structure-phase composition of powder compacts of 13 Cr – 2 Mо – BN when the content of boron nitride changes in them allows us to provide the specified physical and mechanical properties in a wide range. The obtained results of studies of the physical and mechanical characteristics of the developed material allow us to reasonably choose the necessary composition of the powder compact for sealing structures of the flow part of steam turbines, depending on their operating conditions.

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