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    Wyświetlanie 1-4 z 4
    Tytuł:
    Charakterystyka porównawcza porcelan niskotopliwych stosowanych w tytanowych połączeniach dla stomatologii
    Comparison between low-melting porcelain used in titanium frameworks in dentistry
    Autorzy:
    Lubas, M.
    Głębicka, M.
    Balaga, Z.
    Kolan, C.
    Jasiński, J.
    Jeziorski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/283937.pdf
    Data publikacji:
    2013
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    niskotopliwa porcelana dentystyczna
    tytan
    struktura
    morfologia proszków
    low-melting dental porcelain
    titanium
    structure
    powders morphology
    Opis:
    W prezentowanej pracy przedstawiono wyniki badań składu fazowego, chemicznego oraz morfologii podstawowych proszków porcelany niskotopliwej firmy Duceratin Kiss Degudent firmy DeguDent, przeznaczonej do licowania szkieletów z tytanu i stopów tytanowo-niobowych oraz porcelany Initial Ti (Ti/Entrance Kit) firmy GC, stosowanej wyłącznie do uzupełnień na podbudowie z tytanu. W pracy przedstawiono analizę porównawczą składu chemicznego oraz morfologii podstawowych proszków wchodzących w skład w/w porcelan dentystycznych. W badaniach zastosowano dyfrakcję rentgenowską (XRD) oraz mikroskopię skaningową wraz z mikroanalizą (SEM/EDS). Badania stomatologicznej porcelany niskotopliwej różnych producentów wykazały, że skład podstawowych proszków bazuje na krzemianach i glino-krzemianach sodowo-potasowych o dość niskim stopniu krystaliczności. Obecność faz krystalicznych stwierdzono tylko dla proszków Opaque zarówno w porcelanie niskotopliwej Duceratin, jak i Initial Ti. Dla porcelany Duceratin fazy krystaliczne występują w postaci tlenku ceru, a dla porcelany Initial Ti jako tlenek cyny. Ponadto w obu proszkach na podstawie analizy rentgenograficznej stwierdzono występowanie tlenków ZrO2 lub TiO2. Badania morfologii wykazały duże zróżnicowanie wielkości ziaren w poszczególnych proszkach porcelanowych. Największe, pojedyncze ziarna > 70 μm zaobserwowano w proszku Opaqus Dentin (OD-A3) Initial Ti, a najmniejsze < 10 μm w proszku Opaque Duceratian.
    The study presents the results obtained during examinations of phase and chemical composition and morphology of basic powders of low-melting porcelain Duceratin Kiss manufactured by DeguDent and Initial Ti (Ti/Entrance Kit) manufactured by GC. Duceratin is used for veneering of titanium frameworks and titanium-niobium alloys. Initial Ti (Ti/Entrance Kit) is dedicated exclusively to titanium-based fillings. This study shows a comparative analysis of the microstructure, chemical composition and morphology of basic powders present in the above listed dentistry porcelains. The study used the X-Ray Diffraction (XRD) and scanning electron microscopy method with microanalysis (SEM/EDS). Characterization of the dental low-melting porcelain from different manufacturers revealed that the basic composition of powders is based on sodium-potassium silicates and aluminosilicates with considerably low degree of crystallinity. Presence of crystalline phases was found only for Opaque powder, both in Duceratin porcelain and in Initial Ti. They performed the role of opacifiers, such as cerium oxide in Duceratin porcelain and tin oxide in Initial Ti. Furthermore, both powders also contain ZrO2 and TiO2. Addition of such oxides improves opacity of porcelain layers. The examinations of powder morphology revealed high difference in grain size in individual porcelain powders. The biggest individual grains (> 70μm) were observed in the powder Opaqus Dentin (OD-A3) Initial Ti, whereas the smallest grains (< 10μm) were found in the powder Opaque Duceratin.
    Źródło:
    Engineering of Biomaterials; 2013, 16, 121; 19-24
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase composition and morphology characteristics of ceria-stabilized zirconia powders obtained via sol-gel method with various pH conditions
    Autorzy:
    Nakonieczny, D. S.
    Paszenda, Z. K.
    Basiaga, M.
    Radko, T.
    Drewniak, S.
    Podwórny, J.
    Bogacz, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/306224.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    zol-żel
    bioceramika
    tlenek cyrkonu
    właściwości termiczne
    morfologia proszków
    sol-gel
    bioceramics
    zirconia
    oxide dopants
    thermal properties
    powder morphology
    Opis:
    High purity, fine crystalline, degradation-free at low temperature powders have attracted special interest in CAD/CAM prosthetic dentistry full ceramic restorations. This study reports the preparation and characterisation of zirconia-ceria (0.9ZrO20.1CeO2) powders. Materials were obtained from zirconium-n-alkoxide and cerium nitrate hexahydrate in the pH 2–4 and 8–10. Methods: Zirconia-ceria powders were obtained with the sol-gel method in a humid-free environment. Thermal analysis (TGA/DTA) of the as-prepared materials was made for an assessment of its behaviour at elevated temperatures. Specimens were dried at 80°C and calcinated in two stages: at 300°C with soaking time 2.5 h and 850°C with holding time 2.5 h, in order to evaluate the phase transformations. Thermal analyses of the as-dried powders were made for an assessment of its thermal behaviour during heat treatment up to 1000 °C. By X-ray diffraction (XRD), polymorphs of ZrO2 were identified. Additionally, scanning electron microscopy (SEM) and laser particle size distribution (PSD) were involved for characterisation of morphology of the powders. Results: We found a correlation between the pH of the colloidal system and the morphology of the as-obtained powders. Based on analysis (SEM,PSD), structures were identified known as soft and hard agglomerates. Conclusions: In summary, it can be stated differences were found between powder morphology depending on the used pH, which can be crucial for powder densification during sintering and compacting green bodies which, as a consequence, may be crucial for the lifetime of zirconia prostheses. Correlations between phase composition and pH are difficult to grasp, and require further more sophisticated studies.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2017, 19, 2; 21-30
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of mechanical alloying process on structural, mechanical and tribological behaviours of CNT reinforced aluminium composites – a statistical analysis
    Autorzy:
    Manikandan, P.
    Elayaperumal, A.
    Franklin Issac, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2173611.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    powder metallurgy
    composites
    morphology
    optimization
    wear
    metalurgia proszków
    kompozyt
    morfologia
    optymalizacja
    Opis:
    The mechanical and tribological properties of the Al/CNT composites could be controlled and improved by the method of its fabrication process. This research article deals with the optimization of mechanical and tribological properties of Al/CNT composites, which are fabricated using the mechanical alloying process with the different weight percentage of multi-walled CNT reinforcement. The phase change and the presence of CNT are identified using the X-Ray Diffraction (XRD) analysis. The influence of mechanical alloying process and the multi-walled CNT reinforcement on the mechanical, and tribological behaviours of the Al/CNT composites are studied. The optimal mechanical alloying process parameters and the weight percentage of multi-walled CNT reinforcement for the Al/CNT composite are identified using the Response Surface Methodology (RSM), which exhibits the better hardness, compressive strength, wear rate and Coefficient of Friction (CoF). The Al/CNT composite with 1.1 wt.% of CNT has achieved the optimal responses at the milling speed 301 rpm and milling time 492 minutes with the ball to powder weight ratio 9.7:1, which is 98% equal to the experimental result. This research also reveals that the adhesive wear is the dominant wear mechanism for the Al/CNT composite against EN31 stainless steel but the optimal Al/CNT composite with 1.1 wt.% of multi-walled CNT has experienced a mild abrasive wear.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 2; art. no. e136745
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of mechanical alloying process on structural, mechanical and tribological behaviours of CNT reinforced aluminium composites – a statistical analysis
    Autorzy:
    Manikandan, P.
    Elayaperumal, A.
    Franklin Issac, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2128149.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    powder metallurgy
    composites
    morphology
    optimization
    wear
    metalurgia proszków
    kompozyt
    morfologia
    optymalizacja
    Opis:
    The mechanical and tribological properties of the Al/CNT composites could be controlled and improved by the method of its fabrication process. This research article deals with the optimization of mechanical and tribological properties of Al/CNT composites, which are fabricated using the mechanical alloying process with the different weight percentage of multi-walled CNT reinforcement. The phase change and the presence of CNT are identified using the X-Ray Diffraction (XRD) analysis. The influence of mechanical alloying process and the multi-walled CNT reinforcement on the mechanical, and tribological behaviours of the Al/CNT composites are studied. The optimal mechanical alloying process parameters and the weight percentage of multi-walled CNT reinforcement for the Al/CNT composite are identified using the Response Surface Methodology (RSM), which exhibits the better hardness, compressive strength, wear rate and Coefficient of Friction (CoF). The Al/CNT composite with 1.1 wt.% of CNT has achieved the optimal responses at the milling speed 301 rpm and milling time 492 minutes with the ball to powder weight ratio 9.7:1, which is 98% equal to the experimental result. This research also reveals that the adhesive wear is the dominant wear mechanism for the Al/CNT composite against EN31 stainless steel but the optimal Al/CNT composite with 1.1 wt.% of multi-walled CNT has experienced a mild abrasive wear.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 2; e136745, 1--9
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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