indirect heating
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Author(s):  
Richard Tribess ◽  
Sávio L. Bertoli ◽  
Carolina K. de Souza ◽  
Mercedes Gabriela Ratto Reiter ◽  
Maria I. L. Krautler ◽  
...  


Energy ◽  
2021 ◽  
pp. 120577
Author(s):  
Makoto Takeuchi ◽  
Shinji Suzuki ◽  
Yutaka Abe


Author(s):  
Ki-Man Bae ◽  
◽  
Han-Suk Choi ◽  
Bo-Ra-Mi Oh ◽  
Jong-Jin Baek ◽  
...  


2020 ◽  
Vol 26 (9) ◽  
pp. 1637-1646
Author(s):  
Juan Sebastian Gomez Bonilla ◽  
Maximilian Alexander Dechet ◽  
Jochen Schmidt ◽  
Wolfgang Peukert ◽  
Andreas Bück

Purpose The purpose of this paper is to investigate the effect of different heating approaches during thermal rounding of polymer powders on powder bulk properties such as particle size, shape and flowability, as well as on the yield of process. Design/methodology/approach This study focuses on the rounding of commercial high-density polyethylene polymer particles in two different downer reactor designs using heated walls (indirect heating) and preheated carrier gas (direct heating). Powder bulk properties of the product obtained from both designs are characterized and compared. Findings Particle rounding with direct heating leads to a considerable increase in process yield and a reduction in powder agglomeration compared to the design with indirect heating. This subsequently leads to higher powder flowability. In terms of shape, indirect heating yields not only particles with higher sphericity but also entails substantial agglomeration of the rounded particles. Originality/value Shape modification via thermal rounding is the decisive step for the success of a top-down process chain for selective laser sintering powders with excellent flowability, starting with polymer particles from comminution. This report provides new information on the influence of the heating mode (direct/indirect) on the performance of the rounding process and particle properties.



Crystals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 619
Author(s):  
Kyoung Jin Kim ◽  
Kei Kamada ◽  
Rikito Murakami ◽  
Takahiko Horiai ◽  
Shiori Ishikawa ◽  
...  

A novel single-crystal growth method was developed, using arc plasma and metal melt, for a quick survey of high melting point materials. Single crystals of Yb-doped Lu2O3, Lu0.388Hf0.612O1.806, and Lu0.18Hf0.82O1.91, with melting points of 2460, 2900, and 2840 °C, respectively, were grown by an indirect heating method using arc plasma. We refer to this indirect heating growth method as the core heating (CH) method. The CH-grown Yb1%-doped Lu2O3 sample showed a full width at half maximum of 286 arcsec in the X-ray rocking curve. This value is better than the 393 arcsec obtained for the crystal grown by the micro-pulling-down (μ-PD) method. The Yb charge transfer state (CTS) emission was observed at 350 nm in the Yb1%-doped Lu2O3 and Lu0.18Hf0.82O1.91. In the case of the μ-PD method, using a rhenium (Re) crucible, absorption due to Re contamination and a resulting reduction in the Yb CTS emission were confirmed. However, contamination did not influence the properties observed in the crystals grown by the CH method.



2020 ◽  
Vol 16 (1) ◽  
pp. 33
Author(s):  
Sudhakar Sapuram ◽  
Suresh Srikantaiah ◽  
Amit Kumar Vishnoi ◽  
Siraparapu Satyanarayana


2019 ◽  
Vol 351 ◽  
pp. 259-272 ◽  
Author(s):  
Sávio L. Bertoli ◽  
Richard Tribess ◽  
Vitória A. Castamann ◽  
Aline Lovatel ◽  
Carolina K. de Souza


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