Controlled Process of Liquid-phase Sintering due to Low-fusible Melt Forming

Chumachenko, N. G.; Tyurnikov, Vladimir V.; Petrova, E. V.

doi:10.1016/j.proeng.2016.08.090

Cited by 5 publications

(7 citation statements)

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“…Research was conducted on the surface treatment of flint aggregate with an aqueous solution of alkaline flow of caprolactam production (AFCP). 4. It has been experimentally established that the thickness of the impregnation layer increases with the increase in the concentration of the AFCP from 3 to 10%, but at a concentration of more than 10% the changes are insignificant.…”

Section: Resultsmentioning

confidence: 99%

“…Such raw materials are mainly applied in expanded and clinker aggregates production for the construction industry. Herein, the type of the aggregate and the choice of its production technology are determined by the composition and the amount of impurities, as well as, the rock hardness [2][3][4][5][6][7][8][9]. Soft representatives in the form of diatomites and clay diatomites are used to produce expanded aggregates by plastic technology.…”

Section: Introductionmentioning

confidence: 99%

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Studying penetrating ability of alkaline flow solution of caprolactam production in flint aggregate

2018

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The study focuses on increasing the clinker formation degree of calculus types of siliceous rock. One of the ways to increase the flint aggregate strength is to saturate the surface layer of grains with alkaline ions. While calcining, this will provide formation of confining elements which are more caked than the inner layers. To preserve natural porosity inside granules and to increase density and durability of a surface layer, it is offered to process grains of dense siliceous rock before calcining them with a solution of alkaline flow of caprolactam production (AFCP). It is shown that the degree of density is determined by the soaking depth, which depends on the molecular structure of alkaline solution. The paper also demonstrates results of influence of processing conditions on soaking depth of grains with 10-15 mm fraction. The researchers studied the effect of AFCP solution concentration in the range varying from 3 to 20%. The duration of treatment ranged from 2 to 5 minutes. The research results are presented in the form of graphs. The optimal processing mode is also determined.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Studying penetrating ability of alkaline flow solution of caprolactam production in flint aggregate

2018

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“…The silicarich Na 2 O-K 2 O-Al 2 O 3 -SiO 2 system used in the present work undergoes the formation of the low-viscosity phase thanks to the presence of the alkaline oxides (Na 2 O and K 2 O). [27][28][29][30][31][32][33][34][35][36] The presence of this low-viscosity phase plays an important role in enhancing the diffusion process that occurs during sintering and in the rearrangement of the high-viscosity phase. 13 The constitutive model proposed in this paper considers the presence of high-(Alumina rich) and low-viscosity (Silica rich) phases to study the microstructure homogeneities and the influence of gravity during sintering.…”

Section: Methodsmentioning

confidence: 99%

“…The present study uses the model described in Contreras et al 24 that takes into account gravity‐induced grain settling during the liquid‐phase sintering. The silica‐rich Na 2 O‐K 2 O‐Al 2 O 3 ‐SiO 2 system used in the present work undergoes the formation of the low‐viscosity phase thanks to the presence of the alkaline oxides (Na 2 O and K 2 O) 27‐36 . The presence of this low‐viscosity phase plays an important role in enhancing the diffusion process that occurs during sintering and in the rearrangement of the high‐viscosity phase 13 .…”

Section: Introductionmentioning

confidence: 91%

“…No references were found on modeling of the PIP process for CMCs, though experimental studies on this manufacturing process have been reported. Studies on polycarbosilanederived SiC ceramic 25 and SiC/SiC composite 26,27 have shown that porosity decreases and mechanical properties improve with the increasing number of PIP cycles. Zhu et al 28 show that increasing pyrolysis temperature and the concentration of SiC fillers in polycarbosilane polymer result in improved mechanical properties in two-dimensional Carbon/ SiC (C/SiC) composites fabricated using the PIP process.…”

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confidence: 99%

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Influence of gravity on sintering of 3D‐printed powder components

et al. 2021

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Present technologies of additive manufacturing (such as binder‐jetting, stereolithography, robocasting, etc.) of complex‐shape powder‐components necessitate fine‐tuning of sintering as applied to highly porous 3D‐printing products. The densification of low‐density, complex shapes requires control of the gravity‐related phenomena to ensure a nearly full and distortion‐free densification. The present study addresses these issues through the involvement of comprehensive finite element simulations, the determination of the additively manufactured powder specimens’ sintering behavior, and the experimental validation of the developed models describing sintering of 3D‐printed objects. The paper describes the application of a numerical approach based on continuum mechanics‐based modeling of the gravity‐induced distortions during sintering of 3D‐printed powder components. The validation of the model is conducted through the comparison with the experimental results obtained for the sintering of the beam‐shape components printed using ceramic stereolithography technology. A practical semi‐analytical criterion, which can be used for sintered 3D‐printed parts’ design recommendations applicable to various material systems, is derived. Based on the obtained design criterion, a design map is developed indicating the allowable 3D‐printed elements’ configurations enabling the avoidance of the excessive gravity‐induced shape distortions.

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