Effects of activated charcoal on physical and mechanical properties of microwave dewaxed investment casting moulds

Yahaya, Bashir; Izman, S.; Idris, Mohd Hasbullah; Dambatta, M. S.

doi:10.1016/j.cirpj.2016.01.002

Cited by 13 publications

(4 citation statements)

References 20 publications

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“…This study also shows the low values of the loss factor of both the wax and the ceramic mold when they are not mixed with a susceptor and the importance of an adequate choice of the susceptors to be used in the wax-mold ceramic interface. In (Yahaya et al, 2016) the impact of the use of microwave susceptors on ceramic molds is studied, concluding that although the porosity and collapsibility of the mold improve, the strength of the mold and its density decrease.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of graphite and TiO₂ as susceptors for microwave dewaxing in ceramic shell casting processes of artworks

Conesa

Fayos-Fernández

Galea

et al. 2022

Journal of Microwave Power and Electromagnetic Energy

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The main problems of the traditional foundry dewaxing processes in fine arts workshops are the emission of gases, the loss of 80% of the wax, the high electrical consumption, and the high risks for the operators. The introduction of the microwave technology for dewaxing of ceramic shell molds allows to minimize some of these problems, although the use of electromagnetic susceptors that capture the radiated energy and transform it into heat is required. This article describes different microwave dewaxing tests using TiO2 and graphite as susceptors. The results obtained show that this technique is viable, allowing the casting process to be carried out with a low percentage of breakage problems in the mold and significantly reducing the emitted gases and electricity consumption. The technique allows to recover in the same operation around 90% of the wax used in small and medium format objects. The tests show that the selection of the material used as a susceptor, the area of application and the power regimes, are fundamental to enable a controlled, soft and non-aggressive dewaxing, both for the art molds and for the environment, as opposed to the traditional Flash Dewaxing technique. In this way, it is possible to change the foundry of ceramic shells for artworks to achieve high levels of performance and safety, and to save energy, time and materials.

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Section: Introductionmentioning

confidence: 99%

Evaluation of graphite and TiO₂ as susceptors for microwave dewaxing in ceramic shell casting processes of artworks

Conesa

Fayos-Fernández

Galea

et al. 2022

Journal of Microwave Power and Electromagnetic Energy

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“…Важное значение при удалении модельного состава из полости ОКФ имеет степень адгезии на границе их контакта. На степень адгезии влияют температура выплавления и вид МС [22]. В работе показано, что, как правило, наполненные промышленные модельные составы не проникают в жидком состоянии в поры огнеупорной керамической формы [22].…”

Section: Introductionunclassified

“…На степень адгезии влияют температура выплавления и вид МС [22]. В работе показано, что, как правило, наполненные промышленные модельные составы не проникают в жидком состоянии в поры огнеупорной керамической формы [22].…”

Section: Introductionunclassified

Investigation of linear shrinkage of model compounds and interaction mechanisms in the «lost wax pattern – refractory ceramic mold» system

Никитин

D’yachkov

Никитин

et al. 2019

Izv.VUZ. Tsvet. Met.

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Выполнено исследование свободной линейной усадки ненаполненных (ПС50-50, МВС3-Т, Romocast 105, Romocast 152) и наполненных (Romocast 252, Romocast 325) модельных составов в зависимости от температуры окружающей среды. Полученные результаты выявили следующие основные особенности в изменении указанного технологического параметра. Установлено, что наибольшей свободной линейной усадкой обладают ненаполненные модельные составы, а наименьшей -наполненные. При этом процессы, связанные со свободной линейной усадкой, протекали в образцах в течение длительного времени (до 24 ч). Это, вероятно, связано с продолжительностью процессов полимеризации и низкой теплопроводностью модельных составов. Изменение температуры окружающей среды в интервале от -5 до +35 °С оказывает существенное влияние на величину изменения линейных размеров образцов из исследованных модельных составов. Изменение длины образцов из ненаполненных модельных составов варьируется в диапазоне от +0,3 до -0,4 %, а из наполненных -от +0,2 до -0,15 %. При охлаждении до -5 °С и последующем нагреве до +20 °С образцов из ненаполненных составов их исходная длина уменьшается в среднем на 0,2 мм, а при нагреве до +35 °С и последующем охлаждении до +20 °С она увеличивается в среднем на 0,2-0,3 мм. При аналогичных изменениях температуры окружающей среды у образцов из наполненных модельных составов изменение размеров составляет не более 0,1 мм. Для устранения растрескивания огнеупорных керамических форм предложено проводить захолаживание системы «выплавляемая модельогнеупорная керамическая форма», что обеспечивает гарантированный зазор между моделью и формой и нивелирует негативное влияние расширяющегося модельного состава.Ключевые слова: литье по выплавляемым моделям, свободная линейная усадка, огнеупорная керамическая форма, система «выплавляемая модель -огнеупорная керамическая форма».Никитин К.В. -докт. техн. наук, доцент, декан факультета машиностроения, металлургии и транспорта Самарского государственного технического университета (СамГТУ) (443100, г. Самара, ул. Молодогвардейская, 244).

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“…They used the MAGMASOFT package to simulate and adjust experiment cooling curves, thereby enhancing the accuracy of mold flow analysis in casting simulations. Yahaya et al [25] used activated charcoal to modify ceramic shell molds. Molds with 20% activated charcoal were shown to enhance microwave absorption, reduce dewaxing time, and improve collapsibility.…”

Section: Introductionmentioning

confidence: 99%

Optimal gating system design for investment casting of 17-4PH stainless steel enclosed impeller by numerical simulation and experimental verification

Kuo¹,

Huang²,

Lai³

et al. 2017

Int J Adv Manuf Technol

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The impellers of centrifugal pumps are highly susceptible to the latent damage of corrosion and cavitation after long periods of transporting chemical fluids. To enhance the structural integrity and effective lifespan of impellers, this study applied mold flow analysis to the design of gating systems for 17-4PH stainless steel enclosed impellers. Our objective was to eliminate shrinkage and porous defects common in investment casting. We adopted various bottom, side, and top pouring systems with different pouring parameters to examine the behavior of the molten metal flow and solidification in the mold cavity. We designed a pressurized gating system with specific gating ratio to achieve a stable flow velocity at ingates. Physical sensors preset in the interior of the cavity were also used to detect thermodynamic behavior and analyze phase changes during casting simulations. The probability of shrinkage defect formation was assessed using the retained melt modulus (RMM) and the Niyama criterion. Experiments and nondestructive inspections show that optimizing the design of the gating system prevented surface shrinkage and interior defects. The improvements also reduced post-processing time and costs, increased yields, and enhanced casting quality.

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Effects of activated charcoal on physical and mechanical properties of microwave dewaxed investment casting moulds

Cited by 13 publications

References 20 publications

Evaluation of graphite and TiO₂ as susceptors for microwave dewaxing in ceramic shell casting processes of artworks

Evaluation of graphite and TiO₂ as susceptors for microwave dewaxing in ceramic shell casting processes of artworks

Investigation of linear shrinkage of model compounds and interaction mechanisms in the «lost wax pattern – refractory ceramic mold» system

Optimal gating system design for investment casting of 17-4PH stainless steel enclosed impeller by numerical simulation and experimental verification

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Effects of activated charcoal on physical and mechanical properties of microwave dewaxed investment casting moulds

Cited by 13 publications

References 20 publications

Evaluation of graphite and TiO2 as susceptors for microwave dewaxing in ceramic shell casting processes of artworks

Evaluation of graphite and TiO2 as susceptors for microwave dewaxing in ceramic shell casting processes of artworks

Investigation of linear shrinkage of model compounds and interaction mechanisms in the «lost wax pattern – refractory ceramic mold» system

Optimal gating system design for investment casting of 17-4PH stainless steel enclosed impeller by numerical simulation and experimental verification

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Evaluation of graphite and TiO₂ as susceptors for microwave dewaxing in ceramic shell casting processes of artworks

Evaluation of graphite and TiO₂ as susceptors for microwave dewaxing in ceramic shell casting processes of artworks