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    Wyświetlanie 1-12 z 12
    Tytuł:
    Wpływ proszków węglowych na ludzkie krwinki białe
    Influence of carbon powder particles on human neutrophils
    Autorzy:
    Bąkowicz-Mitura, K.
    Czerniak-Reczulska, M.
    Baj, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/285157.pdf
    Data publikacji:
    2007
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    proszek diamentowy
    krwinki białe
    diamond powder particles
    neutrophils
    Źródło:
    Engineering of Biomaterials; 2007, 10, no. 63-64; 32-34
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research and analysis of the results of the internal combustion engine locomotive during the 85-hour endurance test
    Autorzy:
    Borkowska, J.
    Kaźmierczak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/245178.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    friction pair
    internal combustion engine
    piston
    ring
    cylinder
    tribological properties
    coating
    EMD645
    endurance test
    diamond powder
    Opis:
    Piston – ring – cylinder assembly of combustion engine has many friction pairs examples, also one of them which decide about fastness to wear, it means first sealing ring – cylinder, called further very simply ring – cylinder unit. During work of this unit, we can observe wear of piston, precisely – of coating which is deposited on ring to prolong service life. Objective of this work was to realize a test of set durability of railway engine EMD645 with power about 1300 kW. Within the framework of this test were investigated a prototyped piston’s rings with diamond embankment. Piston rings are made of diamond coating technology with a porous chromium coating, where in pores is deposited on said diamond powder with a grain size about 1 micron. The work will be carried out of an analysis of collaboration piston – rings – cylinder unit in internal combustion engine and an analysis of the use of hard materials in friction pairs, including powders. Will be performed research of material and description of diamond powder, which will be applied to the piston rings. After stability, testing in the locomotive engine EMD645 on the basis of the collected results will be developed conclusions of the wearing intensity on piston ring and relating them to the requirements for coatings. The work aims to show the possibilities and benefits of the application of new protective coatings on structural elements of the internal combustion engine in order to reduce their wearing, which is consistent with the observed trend of technology development.
    Źródło:
    Journal of KONES; 2016, 23, 2; 53-59
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sintered FeCuRe Alloys Produced from Commercially Available Powders
    Autorzy:
    Borowiecka-Jamrozek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/353762.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sintered alloy
    matrix powder
    hot pressing
    diamond impregnated tools
    Opis:
    This paper discusses the mechanical properties of materials fabricated from commercially available powders designed for use as a metal matrix of diamond-impregnated composites. The powders with the catalogue numbers CSA and CSA800 produced in China were tested under laboratory conditions. The specimens were fabricated in a graphite mould using hot pressing. The materials were analysed for density, porosity, hardness and static tensile strength. A scanning electron microscope (SEM) was employed to observe the microstructure and fracture surfaces of the specimens. The experimental data was used to determine how the chemical composition of the powders and the process parameters affected the microstructure and properties of the materials. The properties of the sintered materials produced from the Chinese powders were compared with the properties reported for specimens fabricated from cobalt powder (Co SMS). Even though the hot pressed CSA and CSA800 powders had inferior mechanical properties to their cobalt analogue, they seem well-suited for general-purpose diamond-impregnated tools with less demanding applications.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 3; 1713-1720
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Application of a Ball-milled Fe-Cu-Ni Powder Mixture to Fabricate Sintered Diamond Tools
    Autorzy:
    Borowiecka-Jamrożek, J.
    Konstanty, J.
    Lachowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/383184.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metallography
    mechanical properties
    sintered diamond tools
    powder mixtures
    hot pressing
    metalografia
    właściwości mechaniczne
    narzędzia diamentowe
    prasowanie na gorąco
    Opis:
    This article discusses results of an analysis of mechanical properties of a sintered material obtained from a mixture of elemental iron, copper and nickel powders ball milled for 60 hours. The powder consolidation was performed by hot pressing in a graphite mould. The hot pressing was carried out for 3 minutes at 900 °C and under a pressure of 35 MPa. The sintered specimens were tested for density, porosity, hardness and tensile strength. Their microstructures and fracture surfaces were also examined using a scanning electron microscope (SEM). The study was conducted in order to determine the suitability of the sintered material for the manufacture of metal-bonded diamond tools. It was important to assess the effects of chemical composition and microstructure of the sintered material on its mechanical properties, which were compared with those of conventional metal bond material produced from a hot-pressed SMS grade cobalt powder. Although the studied material shows slightly lower strength and ductility as compared with cobalt, its hardness and offset yield strength are sufficiently high to meet the criteria for less demanding applications.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 1; 5-8
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Use of diamond powder in the ionization process
    Autorzy:
    Brzecka, P.
    Janaszczyk, A.
    Chuchracki, M.
    Mitura, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/284028.pdf
    Data publikacji:
    2017
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    diamond powder
    ionization
    allergic reaction
    Źródło:
    Engineering of Biomaterials; 2017, 20, no. 143 spec. iss.; 86
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Post-Heat Treatment on Microstructure and Mechanical Properties of Cu-Fe-Co Powder Alloy Fabricated by Hot Pressing
    Autorzy:
    Çelik, E.
    Aslan, A. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/353200.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    diamond cutting tools
    Cu-Fe-Co alloy
    powder metallurgy
    hot pressing
    heat treatment
    Opis:
    In this study, the powder mixture which consists of Cu-Fe-Co was produced by using the method of hot pressing technique. In addition, effect of heat treatment process on microstructure and mechanical properties of this alloy was investigated. Following the hot pressing process applied on the samples, heat treatment was carried out at 950°C for two different dwelling times (90 and 180 minutes). Measured density values were considered as physical characteristics, while hardness and fracture strength values were considered as mechanical characteristics. It was observed that porosity rates of hot pressed samples were decreased by increasing of temperature and pressing parameters. In this study it was observed that Cu was spread in matrix and filled the micro porosities. Hardness values were determined to be decreased as a result of grain growth after heat treatment process. That 4 fold increased elongation % values which were achieved by TRS experiments were observed as well.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 1; 371-377
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of the effect of diamond powder on the thermal properties of octadecane using differential scanning calorimetry
    Autorzy:
    Godlewski, Wojciech
    Sierakowski, Mateusz
    Domański, Roman
    Kapuściński, Jakub
    Powiązania:
    https://bibliotekanauki.pl/articles/242378.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    phase change materials
    PCM
    diamond powder
    thermal conductivity
    thermal diffusivity
    Opis:
    The purpose of this work was to examine the effect of diamond powder on the thermal properties of phase change materials on the example of octadecane. The experiment involved mixing of diamond powder with a specific granulation with the aforementioned representative of the alkanes group. Two different grain sizes were used: 50 and 250 micrometres. The change of specific heat, latent heat of phase change and degree of supercoiling in newly formed mixtures was compared to the pure forms of the phase-change materials used. Initial mixing with a glass-stirring rod showed strong stratification for each granulation due to the low viscosity of the mixture and too large differences between component densities. It was decided to add amorphous silicon dioxide to the mixtures, which increases density of the mixture. The optimal percentage of amorphous silicon dioxide was estimated experimentally. Measurements of thermal parameters were carried out using DSC technology. The results of the tests of specific heat and latent phase transition heat showed that with the increasing content of diamond, the specific heat of the mixture decreases almost twice, and the latent heat can decrease by up to three times. The effect of diamond powder on reducing the degree of supercoiling of the mixture was also observed. An important observation was that the mixture with higher granulation of diamond powder had greater tendency for sedimentation. This method could be used to increase thermal conductivity and diffusivity of phase change materials and make them viable for use in systems that require cooling at high rate or temperature stabilization, such as control systems in electronic vehicles or aviation industry and at the same time decrease the degree of supercoiling which could increase the efficiency of system.
    Źródło:
    Journal of KONES; 2019, 26, 3; 39-45
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Team durability test of a 1.3 MW locomotive diesel engine with prototype piston rings
    Autorzy:
    Kaźmierczak, Andrzej
    Tkaczyk, Marcin
    Powiązania:
    https://bibliotekanauki.pl/articles/2097584.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    combustion engine
    durability test
    piston ring
    diamond powder
    multilayer
    silnik spalinowy
    badanie trwałości
    pierścień tłokowy
    proszek diamentowy
    wielowarstwa
    Opis:
    Objective of this work was to realize a test of durability of railway engine EMD645 with power about 1300 kW. Within the framework of this test were investigated a prototyped piston’s rings with diamond embankment. Piston rings are made of chromium layer with including of diamond powders technology with a porous chromium coating, where in pores is deposited on said diamond powder with a grain size about 1 micron. The work will be carried out of an analysis of collaboration piston-piston rings-cylinder unit in internal combustion engine and an analysis of the use of hard materials (diamond powder) in friction pairs. During work of this unit we can observe wear of piston rings, precisely - of coating which is deposited on ring to prolong service life. After testing of the locomotive engine EMD645 on the basis of the collected results are developed conclusions of the wearing intensity on piston ring and relating them to the requirements for coatings. The work aims to show the possibilities and benefits of the application of new protective coatings on structural elements of the internal combustion engine in order to reduce their wearing, which is consistent with the observed trend of technology development.
    Źródło:
    Combustion Engines; 2021, 60, 4; 77--82
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New Wear Resistant Iron-Base Matrix Materials For The Fabrication Of Sintered Diamond Tools
    Nowe, odporne na zużycie ścierne materiały na bazie żelaza przeznaczone do produkcji spieków narzędziowych metaliczno-diamentowych
    Autorzy:
    Konstanty, J.
    Romański, A.
    Baczek, E.
    Tyrala, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/355118.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ball milling
    sintered diamond tools
    matrix powder
    Fe-Ni-Cu-Sn-C
    Fe-Mn-Cu-Sn-C
    hot pressing
    mielenie kulowe
    spieki narzędziowe metaliczno-diamentowe
    materiały spiekowe
    prasowanie na gorąco
    Opis:
    The possibility of the use of inexpensive iron-base powders in the production of sintered diamond tools is again explored. Ball-milled Fe-Ni-Cu-Sn-C and Fe-Mn-Cu-Sn-C powders were consolidated to a virtually pore-free condition by hot pressing at 900°C. The resultant materials are characterised by a combination of high Knoop hardness, 260-440 and yield strength, 780-1350 MPa, and resistance to abrasion. These properties can be significantly modified by changing the milling time.
    W artykule zamieszczono wyniki badań nad możliwością zastosowania tanich proszków na bazie żelaza do produkcji spiekanych narzędzi metaliczno-diamentowych. Mielone proszki Fe-Ni-Cu-Sn-C i Fe-Mn-Cu-Sn-C poddano prasowaniu na gorąco w temperaturze 900°C. Otrzymane spieki posiadają gęstość zbliżoną do teoretycznej, wysoką twardość (260-400 HK0.5), granicę plastyczności (780-1350 MPa) oraz dużą odporność na zużycie ścierne. Wymienione własności są w dużym stopniu uzależnione od czasu mielenia proszków wyjściowych.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2A; 633-637
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Origins and development directions of diamond abrasive tools for processing of stone materials
    Geneza i kierunki rozwoju diamentowych narzędzi ściernych do obróbki materiałów kamiennych
    Autorzy:
    Rajczyk, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2067768.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Częstochowska
    Tematy:
    diamond powder
    stone materials
    stone processing
    tool development
    proszek diamentowy
    materiały kamienne
    obróbka kamienia
    rozwój narzędzi
    Opis:
    The technical level of the stone processing tools corresponds to the level of advanced technology of processing stone pieces of a specific degree of hardness. The analysis of historical building objects, e.g. in Ancient Egypt, informs and allows to put forward a hypothesis about the tools used at that time and the advancement of machining technology from the period from 3000 BC, where the small natural grains of the diamond, called amadeus, were used as an abrasive. The historical periods describing the diamond, as a raw material for the production of machining tools, proved that the degree of development of human civilization and the possibility of technical development of many branches of economic life in the whole world is determined by the determinant of machining tools. The study presents the genesis of the development of machining tools with placing and verifying the hypothesis about the production of diamond segments during the construction of the pyramids in Giza, with the 19th and 20th century development of diamond tools. The hypothesis put forward results from the conducted research studies analyzing the behavior of diamond grain in a metallic-tin bond.
    Poziom techniczny narzędzi do obróbki kamienia odpowiada poziomowi zaawansowanej technologii prażenia kawałków kamienia o określonym stopniu twardości. Analiza historycznych obiektów budowlanych, np. w Egipcie, pozwala wysunąć hipotezę na temat narzędzi stosowanych w tym czasie oraz dodatkowo na temat zaawansowania technologii obróbki z okresu od 3000 r. p.n.e., gdzie małe naturalne ziarna diamentu, zwanego amadeus, zostały użyte jako materiał ścierny. W pracy przedstawiono genezę rozwoju narzędzi do obróbki skrawaniem wraz z postawieniem i weryfikacją hipotezy o produkcji segmentów diamentowych podczas budowy piramid w Gizie. Hipoteza ta wynika z przeprowadzonych badań, analizujących zachowanie się ziarna diamentu w wiązaniu metal-cyna.
    Źródło:
    Zeszyty Naukowe Politechniki Częstochowskiej. Budownictwo; 2018, 24 (174); 291-297
    0860-7214
    Pojawia się w:
    Zeszyty Naukowe Politechniki Częstochowskiej. Budownictwo
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of the geometric form of flexible diamond discs on the properties of treated surfaces
    Wpływ kształtu geometrycznego elastycznych tarcz diamentowych na właściwości obrabianych powierzchni
    Autorzy:
    Rajczyk, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/2175039.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Częstochowska
    Tematy:
    abrasive wheels
    mineral surface treatment
    synthetic diamond powder
    synthetic binders
    surface roughness
    tarcze ścierne
    mineralna obróbka powierzchni
    syntetyczny proszek diamentowy
    spoiwa syntetyczne
    chropowatość powierzchni
    Opis:
    The shaping of structural elements of flexible discs formed from synthetic diamond powders on synthetic binders is one of the current problems facing researchers when creating new, highly effective machining tools for the processing of mineral materials. Over many years, natural stone and particularly hard types of rock have been used for and still remain a noble, durable and highly appreciated building material for facings. Meeting the normative requirements for shaping functional properties in automated technology systems for processing such materials requires the development of methods for modeling new construction and material solutions for machining tools, especially with the use of diamond abrasives, which are increasingly used in construction technologies. One requirement is to study the influence of the geometrical form of the abrasive segments of flexible machining discs in order to increase the efficiency of the process of finishing granite surface grinding.
    Kształtowanie elementów konstrukcyjnych elastycznych tarcz formowanych z syntetycznych proszków diamentowych na spoiwach syntetycznych stanowi jeden z aktualnych problemów w zakresie badań nad tworzeniem nowych wysoko efektywnych narzędzi obróbczych do obróbki materiałów mineralnych. Kamień naturalny, szczególnie twarde rodzaje skał, od lat były i nadal pozostają szlachetnym trwałym i wysoko docenianym materiałem budowlanym, stosowanym jako materiał okładzinowy. Spełnienie normatywnych wymagań w zakresie kształtowania właściwości użytkowych w zautomatyzowanych systemach technologii obróbki takich materiałów wymaga opracowania sposobów modelowania nowych rozwiązań konstrukcyjno-materiałowych narzędzi obróbczych szczególnie z wykorzystaniem ścierniwa diamentowe go, które w technologiach budowlanych znajdują coraz większe zastosowanie. Jednym z nich jest zbadanie wpływu formy geometrycznej segmentów ściernych elastycznych tarcz obróbczych w celu zwiększenia efektywności procesu szlifowania wykończeniowego powierzchni płyt granitowych.
    Źródło:
    Zeszyty Naukowe Politechniki Częstochowskiej. Budownictwo; 2021, 27 (177); 198-203
    0860-7214
    Pojawia się w:
    Zeszyty Naukowe Politechniki Częstochowskiej. Budownictwo
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of thermal properties of novel phase change material mixtures (octadecane-diamond) with laser flash analysis
    Autorzy:
    Sierakowski, Mateusz
    Godlewski, Wojciech
    Domański, Roman
    Kapuściński, Jakub
    Wiśniewski, Tomasz
    Kubiś, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/246255.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    phase change materials
    PCM
    diamond powder
    thermal conductivity
    thermal diffusivity
    Opis:
    Phase change materials (PCMs) are widely used in numerous engineering fields because of their good heat storage properties and high latent heat of fusion. However, a big group of them has low thermal conductivity and diffusivity, which poses a problem when it comes to effective and relatively fast heat transfer and accumulation. Therefore, their use is limited to systems that do not need to be heated or cooled rapidly. That is why they are used as thermal energy storage systems in both large scale in power plants and smaller scale in residential facilities. Although, if PCMs are meant to play an important role in electronics cooling, heat dissipation, or temperature stabilization in places where the access to cooling water is limited, such as electric automotive industry or hybrid aviation, a number of modifications and improvements needs to be introduced. Investigation whether additional materials of better thermal properties will affect the thermal properties of PCM is therefore of a big interest. An example of such material is diamond powder, which is a popular additive used in abradants. Its thermal diffusivity and conductivity is significantly higher than for a pure PCM. The article presents the results of an analysis of the effect of diamond powder on thermal conductivity and diffusivity of phase change materials in the case of octadecane.
    Źródło:
    Journal of KONES; 2019, 26, 4; 211-218
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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