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Wyświetlanie 1-15 z 125
Tytuł:
"Mechanical Alloying-Compaction-Electroplating" as Technological Scheme for the Development of Nanocomposite Coatings
Autorzy:
Popov, V.
Powiązania:
https://bibliotekanauki.pl/articles/1375576.pdf
Data publikacji:
2014-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.15.Pq
81.05.Ni
81.20.Ev
Opis:
A novel technique of producing composite electrochemical coatings with non-agglomerated nanodiamond reinforcing particles uniformly distributed in the matrix was developed. The technique is intended for coatings to be applied by transferring material from the anode to the cathode. The anode is fabricated using the mechanical alloying method that enables a composite with the uniform distribution of non-agglomerated nanoparticles to be formed.
Źródło:
Acta Physica Polonica A; 2014, 126, 4; 1005-1007
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Evaluation of Cu-B₄C Composites Manufactured by Powder Metallurgy
Autorzy:
Yener, T.
Altinsoy, I.
Yener, S.
Celebi Efe, G.
Ozbek, I.
Bindal, C.
Powiązania:
https://bibliotekanauki.pl/articles/1401279.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Ni
81.20.Ev
72.80.Tm
Opis:
In this study, the influences of B₄C ratios on some mechanical and physical properties such as relative density, microhardness and electrical properties of cold pressed Cu-B₄C composites were investigated. Curve fitting is applied for the estimation of electrical conductivity. Commercial copper powders with 40 μm particle size were reinforced with B₄C, with particle size of 40 μm, at ratios of 1, 2, 3 wt.%, for improving mechanical properties of copper used as electrical conductor. Cu-B₄C composites have been fabricated by powder sintering process at a temperature of 900°C for 2 h. The presence of Cu and B₄C, which are dominant components in the sintered composites, were confirmed by X-ray diffraction analysis technique and SEM-EDS. Scanning electron microscope (SEM-EDS) has shown that B₄C particles are distributed homogenously in the copper matrix. The relative densities of Cu and Cu-B₄C composites, sintered at 900°C, ranged from 95.7 to 91.6%. Microhardness of composites ranged from 84.5 to 94.6 HB. It was observed that cold pressed Cu-1 wt.% B₄C composites revealed promising physical properties. Results of electrical conductivity measurement of Cu-B₄C composite material are compared to the results of the model and the overall accuracy level above 96% is obtained.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1045-1047
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Experimental Study for Machinability of $Al//SiC_{p}$ Metal Matrix Composites by Laser
Autorzy:
Kasman, S.
Ozan, S.
Feray Guleryuz, L.
Ipek, R.
Powiązania:
https://bibliotekanauki.pl/articles/1399697.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Ni
81.20.Ev
81.20.Wk
Opis:
In this study, the laser milling process was used to investigate the machinability of particle reinforced aluminum matrix composites manufactured by powder metallurgy having different amount of $SiC_{p}$ (5, 10, 20 wt%). In this context, the laser parameters like scan speed and fill spacing were associated with the $SiC_{p}$ amount in aluminum (Al) matrix. According to the experimental results, the scan speed is dominant factor on both milling depth and surface roughness. Also, the reinforcement particle amount (wt%) is the effective factor but there is no detected significant relation between the surface roughness and reinforcement particle amount. However, the change in milling depth has been linearly changed with the increase of reinforcement particle amount.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 221-223
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Investigation on TiNi Intermetallic Produced by Electric Current Activated Sintering
Autorzy:
Ergin, N.
Ozdemir, O.
Powiązania:
https://bibliotekanauki.pl/articles/1399714.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Ev
81.40.Pq
Opis:
In this study, TiNi intermetallic compounds were produced by electric current activated sintering in open air under an uniaxial pressure of 200 MPa at a maximum of 1200 A for 10 min using Ni powder (99.8% purity, 4-7 μm), Ti powder (99.5% purity, less than 44 μm). The elemental powders were mixed in the stoichiometric ratio corresponding to the TiNi intermetallic at molar proportion of 1:1. Scanning electron microscopy and X-ray diffraction analysis were used to characterize produced samples. X-ray diffraction studies revealed that the dominant phases are TiNi, $NiTi_2$, $Ni_3Ti$, TiO, and $Ni_2Ti_3$. Scanning electron microscopy examinations showed a dense microstructure with very low amount of porosity. The relative density of test materials measured according to Archimedes' principle was 96.8%, and the microhardness of materials was about 773.6 ± 123 $HV_{0.05}$.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 248-249
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the Fracture Surfaces of New Development Insulated Iron Powder Compounds
Autorzy:
Bidulský, R.
Bidulská, J.
Kvačkaj, T.
Actis Grande, M.
Powiązania:
https://bibliotekanauki.pl/articles/1201089.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.-y
81.20.Ev
81.40.Np
Opis:
Goal of the present paper is the analysis of the fracture surfaces of an Insulated Iron Powder Compound (IIPC) with different additions of aluminium alloy (0.25, 0.5 and 0.75 wt.%), in order to improve the mechanical properties, evaluated as the transverse rupture strength (TRS) with sufficient magnetic properties (mainly represented by the iron loss and coercivity force). Investigation of microstructure and porosity development concluded that improvements in bending strength and impact values require the reduction of surface oxides during the heat treatment, in order to get a proper load bearing area between the adjacent particles.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 154-155
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anisotropic Elastic and Acoustic Properties of Bulk Graphene Nanoplatelets Consolidated by Spark Plasma Sintering
Autorzy:
Koller, M.
Seiner, H.
Landa, M.
Nieto, A.
Agarwal, A.
Powiązania:
https://bibliotekanauki.pl/articles/1402122.pdf
Data publikacji:
2015-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.35.Cg
81.40.Jj
81.05.ue
81.20.Ev
Opis:
Elastic anisotropy and acoustic attenuation in bulk material consisting of consolidated graphene nanoplatelets are studied. The material was prepared by spark plasma sintering, and exhibits highly anisotropic microstructure with the graphene nanoplatelets oriented perpendicular to the spark plasma sintering compression axis. The complete tensor of elastic constants is obtained using a combination of two ultrasonic methods: the through-transmission method and the resonant ultrasound spectroscopy. It is shown that the examined material exhibits very strong anisotropy both in the elasticity (the Young moduli in directions parallel to the graphene nanoplatelets and perpendicular to them differ by more than 20 times) and in the attenuation, where the dissipative effect of the internal friction in the graphene nanoplatelets combines with strong scattering losses due to the porosity. The results are compared with those obtained for ceramic-matrix/graphene nanoplatelet composites by the same ultrasonic methods.
Źródło:
Acta Physica Polonica A; 2015, 128, 4; 670-674
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the Electron Theory of Sintering to the Ferrite Systems
Autorzy:
Kopayev, A.
Bushkova, V.
Powiązania:
https://bibliotekanauki.pl/articles/1549694.pdf
Data publikacji:
2010-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
31.10.+z
36.20.Hb
66.30.-h
77.84.Bw
81.20.Ev
85.70.Ge
Opis:
The compositions of magnesium-zinc ferrites $(Mg_{0.56}Zn_{0.44})_{1-y}Fe_{2 + 2y/3}O_{4}$, where y = -0.05, 0, +0.05 were sintered at temperatures 1230 and 1280°C. The analysis of the kinetics of sintering was carried out by using the Ivensen model. It was shown that at decrease of y the sintering rate increases. The analysis of the electronic configurations of the cations in the ferrite composition showed the possibility of applying the Samsonov electronic theory of sintering powders to them. Magnetic permeability of the studied chemical compositions increases with increase of the density of ferrites as well as with the temperature and the time of isothermal soaking.
Źródło:
Acta Physica Polonica A; 2010, 117, 1; 30-33
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
B₄C-CNT Produced by Spark Plasma Sintering
Autorzy:
Apak, B.
Sahin, F.
Powiązania:
https://bibliotekanauki.pl/articles/1401275.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Ev
81.05.Je
81.05.U-
88.30.rh
Opis:
H.C. Starck HS Grade boron carbide (B₄C) powders with multi-walled carbon nanotube (CNT) were sintered by Spark Plasma Sintering (SPS) method in a vacuum atmosphere to obtain highly dense and fine grained final ceramic products. Powder mixtures were densified by SPS at 1650 and 1725°C using 40 MPa pressure for 5 min. The effects of heating rate, spark plasma sintering temperature and CNT additive on density, hardness, fracture toughness and microstructures of B₄C-CNT samples are investigated. Density measurements were carried out using Archimedes method. Hardness and fracture toughness were examined by Vickers indentation technique. Scanning Electron Microscope (SEM) was used to observe microstructural investigation.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1029-1031
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics Bronze/$Al_2O_3(Ni)$ Reinforcement Metal Matrix Composite Produced by Current Activated Sintering
Autorzy:
Uysal, M.
Karslioğlu, R.
Akbulut, H.
Alp, A.
Powiązania:
https://bibliotekanauki.pl/articles/1399704.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Ni
81.20.Ev
81.40.Pq
Opis:
In this study, a bronze matrix (90 wt% Cu + 10 wt% Sn) was reinforced with $Al_2O_3$ particles using mechanical alloying and then produced by a subsequent rapid current sintering technique. The mechanically ball milled bronze powders were reinforced with electroless Ni coated 20 vol.% $Al_2O_3$ particles with three different particle sizes of 90, 70, and 50 μm. Microhardness testing, and scanning electron microscopy were used for the structural characterization of the composites. The tribological behavior of the resultant composites was tested by the ball-on-disk method at 1.0 N applied load with 0.3 m/s sliding speed for determination the wear loss and friction coefficient features against a counterface steel ball.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 235-237
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization Investigations of W-Ni Matrix Composites Reinforced with $TiB_2$ and $La_2O_3$
Autorzy:
Gökçe, H.
Balcı, Ö.
Ağaoğulları, D.
Demirkan, Ö.
Genç, A.
Öveçoğlu, M.
Duman, İ.
Powiązania:
https://bibliotekanauki.pl/articles/1399817.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Ev
Opis:
W-1 wt% Ni (W1Ni) matrix composites reinforced with $TiB_2$ and $La_2O_3$ particles were fabricated via mechanical alloying and activated sintering methods. Powder blends with compositions of W1Ni-2 wt% TiB_2-x wt% $La_2O_3$ (x = 0.5, 1) were mechanically alloyed for 6 and 12 h. The results showed that increase in mechanical alloying duration to 12 h causes the decline of grain sizes of the W-Ni matrix to nanoscales. $TiB_2//La_2O_3$ particles have a significant effect on the density/microhardness values and wear amounts of the sintered samples.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 309-312
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of $Ni_3Al$ and $Ti_3Al$ Coatings Produced by Electric Current Activated Sintering Method
Autorzy:
Ergin, N.
Yoruk, G.
Ozdemir, O.
Powiązania:
https://bibliotekanauki.pl/articles/1399712.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Ev
81.40.Pq
Opis:
The present study reports on $Ni_3Al$ and $Ti_3Al$-based intermetallics coated on AISI 1010 steel substrate by one-step pressure assisted electric current activated sintering method. Ni, Ti, and Al elemental powders were mixed in the stoichiometric ratio corresponding to the $Ni_3Al$ and $Ti_3Al$ intermetallics at molar proportion of 3:1. The mixed coating powders were placed onto the steel substrate in a mold, and pressed with compressive stress of 100 MPa and then, electric current: 1100-1200 A, voltage 2.9-3.4 V was applied for 15 min during coating. As-synthesized coatings seem to have good adherence with many small porosities. The phases formed in the $Ni_3Al$ coating layer were $Ni_3Al$ as a major phase beside NiO and $NiAl_2O_4$ trace phases, which were confirmed by X-ray diffraction analysis. However, TiAl and Ti trace phases besides major $Ti_3Al$ phase were detected in the $Ti_3Al$ coating. The hardness of the $Ni_3Al$, $Ti_3Al$ coatings and AISI 1010 substrate was approximately 321 ± 18, 445 ± 13 and 157 $HV_{0.5}$, respectively.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 245-247
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of Barium Titanate Ceramic Powders by Raman Spectroscopy
Autorzy:
Lazarević, Z.
Romčević, N.
Vijatović, M.
Paunović, N.
Romčević, M.
Stojanović, B.
Dohčević-Mitrović, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1808060.pdf
Data publikacji:
2009-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.84.-s
81.07.Bc
81.20.Ev
83.85.Hf
Opis:
Barium titanate, $BaTiO_3$ ceramic powders were prepared by mechanochemical synthesis and by the Pechini method. A powder mixture of BaO and $TiO_2$ was treated in a planetary ball mill in an air atmosphere for up to 1 h, using zirconium oxide vial and zirconium oxide balls as the milling medium. After 60 min $BaTiO_3$ phase was formed. In both ways $BaTiO_3$ ceramics were sintered after 2 h on 1300°C without pre-calcinations step. The heating rate was 10°C $\text{min}^{-1}$. The formation of phase and crystal structure of $BaTiO_3$ was approved by X-ray diffraction analysis and the Raman spectroscopy. The morphology and microstructure of obtained powders were examined by scanning electron microscopy method. Sharp phase transition from ferroelectric to paraelectric state was observed. The hysteresis loop is very well performed with regular sharp characteristic of ferroelectric materials.
Źródło:
Acta Physica Polonica A; 2009, 115, 4; 808-810
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of CoTi Intermetallic Materials Produced by Electric Current Activated Sintering
Autorzy:
Ergin, N.
Ozdemir, O.
Powiązania:
https://bibliotekanauki.pl/articles/1219351.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Ev
81.40.Pq
Opis:
In the present work, the characterization and production of CoTi intermetallic materials produced by electric current activated sintering under 300 MPa uniaxial pressure in open air at 2000 A for 6 min was investigated. Cobalt powder with 10 μm size and titanium powder < 40 μm size having 99.9% and 99.5% purity, respectively, were used. The elemental powders were mixed in the stoichiometric ratio corresponding to the CoTi intermetallic, in a molar proportion of 1:1. Scanning electron microscopy and X-ray diffraction analysis were used to characterize produced samples. In microstructural examinations it was found that the sample has multi-phase microstructure. X-ray diffraction studies revealed that the phases are CoTi, $CoTi_2$, $TiCo_2$, and $CoTiO_3$. The relative density of test materials measured according to Archimedes' principle was 87.6%, and the microhardness of materials was about 646.74 $HV_{0.1}$.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 399-401
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of Machined Surface by EDM for $Al//B_4C_{p}$ Composite Material
Autorzy:
Kasman, S.
Feray Guleryuz, L.
Ozan, S.
Ipek, R.
Powiązania:
https://bibliotekanauki.pl/articles/1399698.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Ni
81.20.Ev
81.20.Wk
Opis:
In this study, electrical discharge machining process was performed to investigate the machinability of $Al//B_4C_p$ metal matrix composites manufactured by powder metallurgy. For this, an experimental layout was conducted by using full factorial design. In the analysis, there are three parameters of which one is at three levels and the remaining are two levels. Totally, 48 experiments were carried out. The surface roughness $(R_{a})$ was increased with increasing the current (C), pulse-on-time $(T_{on})$, pulse-off-time $(T_{off})$ and amount of particle (PR).
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 224-226
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of Nanocrystalline Cu25Mo Electrical Contact Material Synthesized via Ball Milling
Autorzy:
Biyik, S.
Powiązania:
https://bibliotekanauki.pl/articles/1031886.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Ev
84.32.Dd
Opis:
In this study, Cu-based Mo-doped composite powder was synthesized by ball milling technique. Elemental powder mixture containing 25 wt.% Mo was milled in a high-energy planetary-type ball mill to achieve homogeneously mixed composite powder. Characterization of the starting and the milled powders was carried out using scanning electron microscopy and laser diffraction analysis. It was found that particle size of powder had gradually decreased with increasing milling duration. scanning electron microscope pictures, corresponding to the later stages of milling process prove that nanocrystalline powders were obtained after milling duration of 30 h. Prolonged milling durations lead to powder contamination, which is undesirable for contact applications, where the purity is of big importance. Therefore, optimum milling duration was determined to be 30 h.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 886-888
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 125

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