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    Wyświetlanie 1-7 z 7
    Tytuł:
    Sintered nanosilver joints on rigid and flexible substrates
    Autorzy:
    Kiełbasiński, K.
    Szałapak, J.
    Młożniak, A.
    Teodorczyk, M.
    Pawłowski, R.
    Krzemiński, J.
    Jakubowska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/201549.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    silver nanopowder
    pressure sintering
    thermal conductivity
    nanoproszek srebra
    spiekanie ciśnieniowe
    przewodność cieplna
    Opis:
    Because of new EU laws restricting the use of harmful substances (i.e. Pb because of the RoHS Directive), the search for new methods of joining has become highly urgent. The main problem for most solutions known to date has been to achieve good electrical parameters while maintaining low sintering temperaturatures. Pastes based on silver nanoparticles were developed, which allow to sinter below 300 ° C. Those layers have sheet resistance below 2 mΩ/sq. Low exposure to heat allows to use these pastes on elastic substrates such as paper or Kapton foil. In present work, the authors proved that it is possible to obtain joints on elastic substrates which can withstand over 30 000 cycles in bend test, with sintering in 300°C, by means of the Low Temperature Joining Technique (LTJT).
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 3; 325-331
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Processing Parameters and Different Content of TiB2 Ceramics on the Properties of Composites Sintered by High Pressure -High Temperature (HP-HT) Method
    Wpływ parametów procesu oraz ceramiki TiB2 na właściwości kompozytów spiekanych metodą wysokociśnieniową (HP-HT)
    Autorzy:
    Sulima, I.
    Jaworska, L.
    Figiel, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/351634.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    titanium diboride (TiB2)
    high pressure-high temperature sintering
    austenitic stainless steel
    properties
    spiekanie metodą wysokociśnieniową
    ceramika TiB2
    stal austenityczna
    właściwości
    Opis:
    In this paper the properties of the austenitic stainless steel reinforced with various volume fractions of TiB2 ceramics have been studied. The high pressure- high temperature (HP-HT) method of sintering was applied to the formation of composites. Samples were sintered at pressure of 5 and 7 ±0.2 GPa and temperatures of 1273 K and 1573 K. For the tested materials, the relative density, Young’s modulus and hardness were measured. In order to investigate the structure changes, the scanning electron microscope was used. The obtained results show that the temperature and pressure influence on the mechanical and physical properties of the investigated composites.
    W prezentowanej pracy zbadano właściwości stali austenitycznej z różnym udziałem objętościowym ceramiki TiB2. Do wytworzenia spieków kompozytowych proszków zastosowano spiekanie wysokociśnieniowe HP-HT. Próbki były spiekane przy ciśnieniu 5 oraz 7±0.2 GPa i temperatururze 1273 K oraz 1573 K. Kompozyty poddano badaniom gęstości, modułu Younga oraz twardości. Badania mikrostruktury przeprowadzono za pomocą skaningowej mikroskopii elektronowej. Uzyskane wyniki badań wykazały, że temperatura oraz ciśnienie wpływają na mechaniczne oraz fizyczne wł aściwości materiałów kompozytowych.
    Źródło:
    Archives of Metallurgy and Materials; 2014, 59, 1; 205-209
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characteristics of the NiAl/Ni3Al Matrix Composite with TiB2 Particles Fabricated by High Pressure - High Temperature Sintering
    Autorzy:
    Hyjek, P.
    Sulima, I.
    Jaworska, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/352345.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sintering
    High Pressure High Temperature process
    metal matrix composites
    tribological properties
    Opis:
    The article presents the results of tests carried out on the manufactured composite materials based on a two-phase NiAl/Ni3Al matrix, which was enriched with the addition of TiB2 ceramic particles added in an amount of 4 and 7 vol%. The resulting mixtures were sintered by the High Pressure High Temperature (HP-HT) process. The results were compared to the results obtained for the sole matrix material produced under the same conditions. It has been shown that, at a lower density, the addition of reinforcing particles increases the composite hardness, Young’s modulus and resistance to frictional wear. However, higher addition of TiB2 (7 vol%) was observed to yield less satisfactory results, and despite higher hardness and lower density caused a decrease in other properties tested. The produced materials were characterized by a compact and highly differentiated microstructure free from any noticeable cracks and pores.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 3; 1511-1520
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Homogeneous Dispersion of Yttrium Oxide Particles in Nickel-Based Superalloy by High Pressure Homogenizing and Ball Milling Method
    Autorzy:
    Byun, Jongmin
    Lee, Young-In
    Oh, Sung-Tag
    Powiązania:
    https://bibliotekanauki.pl/articles/2049123.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Ni-based superalloy
    Y2O3 dispersion
    high pressure homogenizer
    spark plasma sintering
    microstructure
    Opis:
    An optimum route to fabricate the Ni-based superalloy with homogeneous dispersion of Y2O3 particles is investigated. Ni-based ODS powder was prepared by high-energy ball milling of gas-atomized alloy powders and Y2O3 particles treated with a high-pressure homogenizer. Decrease in particle size and improvement of dispersion stability were observed by high-pressure homogenization of as-received Y2O3 particles, presumably by the powerful cavitation forces and by collisions of the particles. Microstructural analysis for the ball-milled powder mixtures reveal that Ni-based ODS powders prepared from high-pressure homogenization of Y2O3 particles exhibited more fine and uniform distribution of Ni and Y elements compared to the as-received powder. These results suggested that high-pressure homogenization process is useful for producing Ni-based superalloy with homogeneously dispersed oxide particles.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 4; 1055-1058
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    De-Lubrication Behavior Of Novel EBS Based Admixed Lubricant In Aluminum P/M Alloy
    Zachowanie nowego lubrykantu na bazie EBS w trakcie spiekania proszku stopu aluminium
    Autorzy:
    Oh, M. C.
    Seok, H.
    Kim, H. J.
    Ahn, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/354258.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    admixed lubricant
    compaction pressure
    powder metallurgy
    sintering
    Al-Cu-Mg alloy
    lubrykant
    zagęszczanie
    metalurgia proszków
    spiekanie
    stop Al-Cu-Mg
    Opis:
    The objective of the present research is to develop a novel lubricant for Al-Cu-Mg P/M alloy and to address the effects of the lubricant and compaction pressure on sintered properties. A lubricant mixture consisting of Ethylene Bis Stearamide, Zn-Stearate, and fatty acid was newly developed in this study, and the de-lubrication behavior was compared with that of other commercial lubricants, such as Ethylene Bis Stearamide, Zn-Stearate, and Al-Stearate. Density and transverse rupture strength of sintered materials with each lubricant were examined, respectively. The microstructural analysis was conducted using optical microscope.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2B; 1427-1431
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Risks of boiler operation during slagging and fouling process – a new methods for the determination of ash sintering temperatures
    Autorzy:
    Urbanek, B.
    Szydełko, A.
    Czajka, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/115821.pdf
    Data publikacji:
    2013
    Wydawca:
    Fundacja na Rzecz Młodych Naukowców
    Tematy:
    mineral matter
    sintering
    fouling
    Leitz test
    strength method
    pressure-drop method
    materia mineralna
    proces spiekania
    zanieczyszczenia
    test Leitz
    metoda sił
    metoda spadku ciśnienia
    Opis:
    The properties of mineral matter occurs in coal in the form of inorganic compounds leads to slagging and fouling process on boiler heating surfaces, burners and ash hopper. The deposition of ash cause many undesirable phenomena such as heat transfer deterioration, damage to internal parts of the boiler as a result of detachment of large agglomerates and finally, costly shutdowns of the boiler. Standardized method of risk assessment of agglomerates formation and sintered fly ash is determined by four melting temperatures of ash. This measurement is based on visual appraisal of ash sample deformation which is subjective and strongly depends on the experience of the person conducting the test. Especially is hard predict the first two temperatures: deformation and sintering. An article has to present three non-standardized methods for determining the sintering temperature by using physical parameters: pressure drop and minimum force of probe destruction. This type of measurement allows a quantitative way to obtain reliable and meaningful result. The experiment showed that the results of non-standard methods deviate from those set using the Leitz method. This allows to conclude that sintering processes occur at much lower temperatures and changing the shape of the initial (test method Leitz) is not the first symptom of demonstrating the melting of the ash.
    Źródło:
    Challenges of Modern Technology; 2013, 4, 2; 47-52
    2082-2863
    2353-4419
    Pojawia się w:
    Challenges of Modern Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect Of Compaction Pressure And Sintering Temperature On The Liquid Phase Sintering Behavior Of Al-Cu-Zn Alloy
    Wpływ ciśnienia prasowania i temperatury spiekania na spiekanie stopu Al-Cu-Zn z udziałem fazy ciekłej
    Autorzy:
    Lee, S. H.
    Ahn, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/351836.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    powder metallurgy
    liquid phase sintering
    compaction pressure
    Al-Cu-Zn alloy
    metalurgia proszków
    spiekanie w fazie ciekłej
    ciśnienie prasowania
    stop Al-Cu-Zn
    Opis:
    The liquid phase sintering characteristics of Al-Cu-Zn alloy were investigated with respect to various powder metallurgy processing conditions. Powders of each alloying elements were blended to form Al-6Cu-5Zn composition and compacted with pressures of 200, 400, and 600 MPa. The sintering process was performed at various temperatures of 410, 560, and 615°C in N2 gas atmosphere. Density and micro-Vickers hardness measurements were conducted at different processing stages, and transverse rupture strength of sintered materials was examined for each condition, respectively. The microstructure was characterized using optical microscope and scanning electron microscopy. The effect of Zn addition on the liquid phase sintering behavior during P/M process of the Al-Cu-Zn alloy was also discussed in detail.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2B; 1485-1489
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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