Temat: modified structure - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: The influence of tool composite’s structure during process of diamond grinding of ceramic materials
Autorzy:: Gawlik, J.
Niemczewska-Wójcik, M.
Krajewska, J.
Sokhan, S. V.
Paščenko, E. A.
Žuk, T. S.
Powiązania:: https://bibliotekanauki.pl/articles/407111.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: ceramic materials
modified diamond tools
surface geometric structure
Opis:: This paper presents the results of the tests performed during the grinding process of the ceramic materials: - polycrystalline ceramics (Zirconium ZrO2) and mono-crystalline ceramics (sapphire -Al2O3) by the diamond tools. Studies have shown that the concentration (thickening) of the tool composite changes the tool’s pore structure when using suitable wetted adamantine additives. Such modified composite has positive impact on tribological properties of the subsurface layer of the machined components. This is manifested by the reduction of the surface roughness and reduction of the vibration amplitude of the coefficient of friction. The possibilities of the positive effects when using wetted additives on the tool’s composite during the pressing (briquetting) stage confirm the study results.
Źródło:: Management and Production Engineering Review; 2014, 5, 4; 9-17
2080-8208
2082-1344
Pojawia się w:: Management and Production Engineering Review
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Microalloying of Continuous Cast Aluminum Strip and Structural Modification Using Plastic Treatment to a 9 μm Foil (Patent no. 39762, P-377/76)
Autorzy:: Purenović, M. M.
Purenović, Jelena M.
Baralić, J. Č.
Powiązania:: https://bibliotekanauki.pl/articles/2203751.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: microalloying
modified continuous cast aluminum strip
nano oxide film
corrosion stability
plasticity
superplasticity
equiaxed structure
strain hardening
surface tension
crystallization zone
dendrites
crystal twinning
Opis:: Innovative procedure of microalloying continuous cast aluminum strip, thickness 10 mm, by Be, Zr and Mn using 3C Pechiney technology (no. 39762, P-377/76), and modifying the existing parameters for strip casting and crystallization was implemented under industrial conditions with two randomly selected batches 2×8 tones, without previous selection of standardized quality of aluminum, purity Al 99.5%, obtained by electrolysis. The application of microalloying and overall structural modification of the technology resulted in obtaining nanoscale, ultra-thin, compact oxide high-gloss film with uniform surface of continuous cast strip, instead of the usual thick and porous oxide film. The outcome of microalloying the obtained equiaxed fine-grained nano/micro structure was avoiding anisotropic and dendritic microstructure of the strip, and improving deformation and plastic properties of modified continuous cast strip subjected to the technology of plastic treatment by rolling until the desired foil thickness of 9 μm was obtained. The invention of microalloying and structural modification, including multiplying effect of several components, directly or indirectly, changed numerous structurally-sensitive properties. The obtained nano/micro structure of crystal grains with equiaxed structure resulted in the synergy of undesirable <111> and inevitable <100> and <110> textures. Numerous properties were significantly enhanced: elastic modulus was improved, and intensive presence of cracks in warm forming condition was prevented due to rapid increase of the number of grains to 10000 grains/cm2 in as-cast state.
Źródło:: Archives of Metallurgy and Materials; 2023, 68, 1; 345--357
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Analysis of the thermal properties and structure of gypsum modified with cellulose based polymer and aerogels
Analiza właściwości cieplnych i struktury gipsu modyfikowanego mikrododatkami
Autorzy:: Prałat, K.
Jaskulski, R.
Ciemnicka, J.
Makomaski, G.
Powiązania:: https://bibliotekanauki.pl/articles/1849755.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: przewodność cieplna
mikrododatek
struktura
metoda gorącego drutu
gips modyfikowany
polimer na bazie celulozy
aerożel
thermal conductivity
micro additive
structure
hot wire method
modified gypsum
cellulose based polymer
aerogel
Opis:: The work presents results of research on the influence of micro materials on the thermal conductivity λ of gypsum. In the research, cellulose-based polymer and aerogel were used as the modifying micro materials. For the purpose of measuring the thermal conductivity, a non-stationary method was used based on the “hot wire method”. A very precise set of devices for measuring and recording the temperature of the heating wire was used. In the presented solution, a single measurement took only one minute. Measurements were recorded with the help of a computer measuring system, with a sampling time of 0.01s. During the 60-second-long test, 6000 measurements of the heating wire temperature were collected. A decrease of the thermal conductivity and density of hardened gypsum with added micro materials was observed due to modifications of the structure of the final product. Experimental values of the thermal conductivity of the gypsum specimens with the addition of polymer and aerogel were respectively over 23% and 6% lower than the non-modified gypsum specimen.
W pracy przedstawiono wyniki pomiarów przewodności cieplnej λ czystego gipsu, a także jego modyfikacji mikrododatkami takimi jak: polimer (hydroksymetylo etylo celuloza - HEMC) i aerożel. Dodatkowo zbadano zmiany struktury modyfikowanych materiałów. Badania przewodności cieplnej oparte są na zaprojektowanym i nowatorskim stanowisku pomiarowym wykorzystującym metodę "gorącego drutu". Czas trwania pomiaru przewodności cieplnej za pomocą komercyjnych urządzeń doświadczalnych mieści się w zakresie 0,5÷4 h, tymczasem w prezentowanych badaniach pojedynczy pomiar trwał minutę. Wyniki uzyskiwane podczas pomiaru rejestrowano za pomocą komputerowego systemu pomiarowego, z czasem próbkowania wynoszącym 0,01s. Podczas 60-sekundowego testu zebrano 6000 pomiarów temperatury drutu grzejnego.
Źródło:: Archives of Civil Engineering; 2020, 66, 4; 153-168
1230-2945
Pojawia się w:: Archives of Civil Engineering
Dostawca treści:: Biblioteka Nauki

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