Temat: vacuum sintering - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Effects of the Microstructure and Strengthening Mechanisms of Mo2C Powders Being Added to Ti-8Nb-4Co Alloy Via the Vacuum Sintering Process
Autorzy:: Chang, Shih-Hsien
Liao, Kun Jie
Huang, Kuo-Tsung
Liang, Cheng
Tematy:: Ti-8Nb-4Co alloy
Mo2C powders
vacuum sintering
TRS
EBSD; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/59110747.pdf Link otwiera się w nowym oknie
Opis:: This study utilizes Ti-8Nb-4Co alloys added to different proportions of Mo2C powders (1, 3, and 5 mass%) by the vacuum sintering process of powder metallurgy and simultaneously vacuum sinters the alloys at 1240, 1270, 1300, and 1330°C for 1 h, respectively. The experimental results indicate that when 3 mass% Mo2C powders were added to the Ti-8Nb-4Co alloys, the specimens possessed the optimal mechanical properties after sintering at 1300°C for 1 h. The relative density was 98.02%, and the hardness and TRS were enhanced to 69.6 HRA and 1816.7 MPa, respectively. In addition, the microstructure of vacuum sintered Ti-8Nb-4Co-3Mo2C alloys has both α and β-phase structures, as well as TiC precipitates. EBSD results confirm that the Mo2C in situ produced TiC during the sintering process and was uniformly dispersed in the grain boundary. Moreover, the reduced molybdenum atom acted as a β-phase stabilizing element and solid-solution in the titanium matrix.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Investigation of the Microstructure and Strengthening Mechanisms of Ti-6Cu-8Nb-xCr3C2 Alloy through Vacuum Sintering Process
Autorzy:: Chang, Shih-Hsien
Weng, Chen-Yu
Huang, Kuo-Tsung
Liang, Cheng
Tematy:: vacuum sintering
Ti-6Cu-8Nb-Cr3C2 alloy
hardness
transverse rupture strength
EBSD; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/2106558.pdf Link otwiera się w nowym oknie
Opis:: This study mixes four different powders to produce Ti-6Cu-8Nb-xCr3C2 (x = 1, 3, and 5 mass%) alloys in three different proportions. The experimental results reveal that when 5 mass% Cr3C2 was added to the Ti-6Cu-8Nb alloys, the specimen possessed optimal mechanical properties after sintering at 1275°C for 1 h. The relative density reached 98.23%, hardness was enhanced to 67.8 HRA, and the transverse rupture strength (TRS) increased to 1821.2 MPa, respectively. The EBSD results show that the added Cr3C2 in situ decomposed into TiC and NbC during the sintering process, and the generated intermetallic compounds (Ti2Cu) were evenly dispersed in the Ti matrix. Furthermore, the reduced Cr atom acts as a β-phase stabilizing element and solid-solution in the Ti matrix. Consequently, the main strengthening mechanisms of the Ti-6Cu-8Nb-xCr3C2 alloys include dispersion strengthening, solid-solution strengthening, and precipitation hardening.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Biofunctional impact of textured coatings in the application of heart assist therapy
Autorzy:: Kurtyka, Przemysław
Major, Łukasz
Kurtyka, Klaudia
Major, Roman
Surmiak, Marcin
Bartkowiak, Amanda
Kopernik, Magdalena
Kaczmarek, Marcin
Kustosz, Roman
Więcek, Justyna
Opis:: Due to a lack of organs, cardiac support systems are being implanted in patients with severe congestive heart failure. One of the solutions to overcome complications such as inflow obstruction or pump thrombosis, which may occur in the case of ventricular assist devices, is to modify the surface of cannulas for the controlled blood clotting process. The results obtained up till now for developed surface coatings clearly show the influence of topographical and mechanical parameters of the coatings on cell viability and protein adsorption mechanism. The new coatings should enable the controlled growth of scar tissue, resulting in the limitation of thromboembolic events, and the reduction of cystic tissue growth into the flow lumen. The aim of this study is to evaluate the correlation between surface topography parameters on the susceptibility of cells to grow and adhere to the substrate as a solution with potential for use in MCS (mechanical circulatory support) devices. Research on surfaces used in MCS devices and on inflow cannulas has been carried out for many years, while the novelty of the present solution makes it a milestone within that type of application simultaneously allowing for appropriate selection of process parameters. Surface modification of titanium alloy Ti6Al7Nb was carried out using vacuum powder sintering of CP-Ti (commercially pure titanium) powder with two morphologies (regular spheres and irregular grains). The characterization of coatings obtained with the proposed method and the influence of measured topographic parameters (applying scanning electron microscopy, contact angle measurement and contact profilometry) on the cytotoxicity and susceptibility to protein adsorption were presented. Advanced albumin adsorption studies have fully confirmed the dependence of surface complexity on protein adsorption. The obtained results show a high potential of the produced coatings toward enabling permanent integration at the implant with the soft tissue.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 4.

Tytuł:: Effect of Vacuum Hot-Press Process on The Sintered Characteristics and Mechanical Properties of A High-Density Cr-31.2 Mass% Ti Alloy
Autorzy:: Chang, S.-H.
Li, C.-L.
Huang, K.-T.
Yang, T.-H.
Tematy:: Cr-31.2 mass% Ti alloy
vacuum hot-press sintering
relative density
TRS
electrical conductivity; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/356911.pdf Link otwiera się w nowym oknie
Opis:: In this study, two different compositions of submicron-structured titanium (760 nm) and micron-structured chromium (4.66 μm) powders were mixed to fabricate Cr-31.2 mass% Ti alloys by vacuum hot-press sintering. The research imposed various hot-press sintering pressures (20, 35 and 50 MPa), while the sintering temperature maintained at 1250°C for 1h. The experimental results showed that the optimum parameters of the hot-press sintered Cr-31.2 mass% Ti alloys were 1250°C at 50 MPa for 1h. Also, the relative density reached 99.94%, the closed porosity decreased to 0.04% and the hardness and transverse rupture strength (TRS) values increased to 81.90 HRA and 448.53 MPa, respectively. Moreover, the electrical conductivity is enhanced to 1.58 × 10⁴ S·cm^-1 However, the grain growth generated during the high-temperature and high-pressure of the hot-press sintering process resulted in the grain coarsening phenomenon of the Cr-31.2 mass% Ti alloys after 1250°C hot-press sintering at 50 MPa for 1h. In addition, the Cr-31.2 mass% Ti alloys were fabricated with the submicron-structured titanium (760 nm) and chromium (588 nm) powders showed more effective compaction than the micron-structured titanium (760 nm) and chromium (4.66 μm) powders did. The closed porosity decreases to 0.02% and the hardness values increase to 83.23 HRA. However, the agglomeration phenomenon of the Cr phase and brittleness of the TiCr₂ Laves phases easily led to a slight decrease in TRS (400.54 MPa).
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: A mechanical system for force delivery to a high vacuum chamber
Mechaniczny układ zadawania siły do urządzeń wysokiej próźni
Autorzy:: Kozioł, S.
Majcher, A.
Matecki, K.
Samborski, T.
Tematy:: komora próżniowa
spiekanie impulsowe
wysoka próżnia
vacuum chamber
pulse sintering
high vacuum; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/256739.pdf Link otwiera się w nowym oknie
Opis:: This paper presents problems connected with the realisation of complex movements of performance elements applied in vacuum chambers. Exemplary solution of a loading system applied in a device for pulse sintering of special materials in high vacuum conditions is presented.
W artykule przedstawiono problematykę związaną z realizacją złożonych ruchów elementów wykonawczych stosowanych w komorach próżniowych. Zaprezentowano przykładowe rozwiązanie układu obciążania zastosowanego w urządzeniu do impulsowego spiekania specjalnych materiałów w warunkach wysokiej próżni.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Wpływ sposobu spiekania na mikrostrukturę i twardość elementów wykonanych metodą metalurgii proszków
The influence of the way of sintering on the microstructure and hardness of elements made by the method of powder metallurgy
Autorzy:: Wendland, J.
Borowski, J.
Majchrzak, W.
Adamek, A.
Tematy:: metalurgia proszków
spiekanie
piec próżniowy
powder metallurgy
sintering
vacuum furnace; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Obróbki Plastycznej
Powiązania:: https://bibliotekanauki.pl/articles/211532.pdf Link otwiera się w nowym oknie
Opis:: W artykule opisano proces wytwarzania części proszkowych stosowany w Instytucie Obróbki Plastycznej. Autorzy porównują właściwości części wykonanych wg procesu opracowanego w Instytucie Obróbki Plastycznej z zastosowaniem dwóch różnych sposobów spiekania końcowego wyprasek wstępnie spieczonych.
The article describes the process of manufacturing powder parts as applied in the Metal Forming Institute. The authors compare the properties of parts made by the process elaborated in the Metal forming Institute with the use of two different ways of final sintering of the initially sintered die stampings.
Dostawca treści:: Biblioteka Nauki

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