| 1. |
- Mukherjee, Debasis Pradip, 1983-, et al.
(author)
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Influence of TiO2 content on the crystallization and microstructure of machinable glass-ceramics
- 2016
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In: Journal of Asian Ceramic Societies. - : Elsevier. - 2187-0764. ; 4:1, s. 55-60
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Journal article (peer-reviewed)abstract
- Glasses based on the SiO2–Al2O3–MgO–K2O–B2O3–MgF2 system added with TiO2were synthesized and characterized by differential scanning calorimetry (DSC), X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) techniques. The results showed that by increasing the TiO2content, glass transition temperature (Tg), both the crystallization peak temperature (TpIand TpII) and activation energy (E) increased. The interconnected large blocky card-like crystals were identified as fluorophlogopite as a major crystalline phase for all three glass-ceramic specimens by (XRD) and subsequently confirmed by SEM. The Vickers hardness (Hv) value for glass-ceramic specimens decreases with progressively increasing TiO2 content (1–10 wt%) and Titania containing MGT-3 glass-ceramic specimen with interconnected large blocky card-like fluorophlogopite mica crystals possess lower Hv (4.26 GPa) as well as good machinability (m = 0.12) useable for machinable applications. The study shows that Titania promoted initial crystallization of glass and can be used as an effective nucleting agent.
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| 2. |
- Qian, Bin, 1984-, et al.
(author)
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Laser sintering of ceramics
- 2013
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In: Journal of Asian Ceramic Societies. - : Informa UK Limited. - 2187-0764. ; 1:4, s. 315-321
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Research review (peer-reviewed)abstract
- The progress of laser sintering of ceramics is reviewed by focusing on the principles and the potentials ofthis new technique as one member of a family of additive manufacturing technologies. After a brief intro-duction of the technology and the interaction between laser beam and ceramics, the characters of lasersintered ceramics are discussed in detail. The unique opportunities of achieving hierarchically structuredheterogeneities and non-equilibrium phase assemblages in bulk ceramics are illustrated. It reveals thatthe laser sintering is not only a feasible technology allowing net shape production of customized 3D partsin a single manufacturing operation but also a promising way for developing ceramics with structuresthat can hardly be made by conventional processing methods.
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| 3. |
- Qian, Bin, 1984-, et al.
(author)
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Monitoring of temperature profiles and surface morphologies during lasersintering of alumina ceramics
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In: Journal of Asian Ceramic Societies. - 2187-0764.
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Journal article (peer-reviewed)abstract
- Additive manufacturing of alumina by laser is a delicate process and small changes of processing parame-ters might cause less controlled and understood consequences. The real-time monitoring of temperatureprofiles, spectrum profiles and surface morphologies were evaluated in off-axial set-up for controllingthe laser sintering of alumina ceramics. The real-time spectrometer and pyrometer were used for rapidmonitoring of the thermal stability during the laser sintering process. An active illumination imagingsystem successfully recorded the high temperature melt pool and surrounding area simultaneously. Thecaptured images also showed how the defects form and progress during the laser sintering process. Allof these real-time monitoring methods have shown a great potential for on-line quality control duringlaser sintering of ceramics.
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| 4. |
- Wang, Ling, et al.
(author)
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Intensive particle rearrangement in the early stage of spark plasma sintering process
- 2015
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In: Journal of Asian ceramic societies. - : Informa UK Limited. - 2187-0764. ; 3:2, s. 183-187
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Journal article (peer-reviewed)abstract
- The densification behaviors of 3 mol% yttria-stabilized tetragonal zirconia polycrystal (3Y-TZP) ceramics during spark plasma sintering (SPS) were analyzed both using the master sintering curve (MSC) approach and by evaluating the temperature dependent evolution of density and densification rate. It was found that densification curves could hardly be fitted using one apparent activation energy value by MSC conception, by which it indicated that more than one densification mechanisms were involved in SPS. Moreover, dependent neither on applied pressure (20-100 MPa) nor heating rates higher than 50 degrees C/min, the maximum densification rate had always been observed at rather similar similar to 78% of theoretical density (TD) accompanied with negligible grain growth. An intensive particle rearrangement mechanism was proposed to dominate the rapid densification to 78% TD in early stage of SPS process, by which it yielded the considerable faster densification rate than those achievable by diffusion-related processes. (C) 2015 The Ceramic Society of Japan and the Korean Ceramic Society.
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