The effects of nanoparticle addition on binder removal from injection molded silicon carbide

Onbattuvelli, Valmikanathan P.; Chinn, Richard E.; Enneti, Ravi K.; Park, Seong-Jin; Atre, Sundar V.

doi:10.1016/j.ceramint.2014.05.104

Cited by 8 publications

(6 citation statements)

References 25 publications

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“…For bimodal feedstock in Figure , the curves converged at E a ≈ 60 kJ/mol. The best convergence in the solvent‐dewaxed feedstock was observed at E a ≈ 60 kJ/mol in both cases …”

Section: Resultsmentioning

confidence: 90%

“…The difference in MDC E a between thermal and solvent dewaxing is attributed to the different mechanisms of wax removal, sample size, and temperatures. Thermal dewaxing has been shown to be more stressful than solvent dewaxing, to the point of fracturing the green compact even at heating rates of 1‐2 K/min for components of size <50 g. The lower E a in the bimodal feedstock compared to the monomodal may be due to the additional solid volume and surface area of the bimodal SiC particles providing additional nucleation sites for wax decomposition.…”

Section: Resultsmentioning

confidence: 99%

“…Onbattuvelli et al investigated the kinetics of dewaxing a paraffin‐PP binder system in heptane solvent for monomodal and bimodal PIM, AlN, and SiC. The bimodal particle size distribution facilitated a higher solids loading in the feedstock than the conventional monomodal distribution, but also reduced the permeability of the compact and slowed the dewaxing rate slightly.…”

Section: Introductionmentioning

confidence: 99%

“…The bimodal particle size distribution facilitated a higher solids loading in the feedstock than the conventional monomodal distribution, but also reduced the permeability of the compact and slowed the dewaxing rate slightly. The activation energy E a of the paraffin wax dissolution in liquid heptane was graphically estimated to be around 50 kJ/mol by the master debinding curve (MDC) method …”

Section: Introductionmentioning

confidence: 99%

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Kinetics of thermal dewaxing of injection‐molded silicon carbide

Chinn

Enneti

Kate

et al. 2019

Int J Ceramic Engine & Sci

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Powder injection molding is a near-net shape, high-speed fabrication process that has been studied only lightly with silicon carbide (SiC) as the powder. The addition of nanoparticles to the monomodal powder to form a bimodal powder increases the solid fraction in the feedstock but may also adversely affect other properties. In this paper, the kinetic properties of thermally dewaxed SiC mono-and bimodal feedstocks by three models were compared to solvent-dewaxed SiC and thermally dewaxed powder metal from other studies. The activation energy E a of pyrolytic dewaxing was graphically estimated by the master dewaxing curve model as ~80 kJ/mol for monomodal and ~60 kJ/mol for bimodal SiC powder size distributions, a little higher than the ~50 kJ/mol by solvent dewaxing of the same compositions. The E a in the Flynn-Wall model was 64 kJ/mol for monomodal and 53 kJ/mol for bimodal. The E a was 49 kJ/ mol for monomodal and 42 kJ/mol for bimodal SiC powder by the Kissinger thermal analysis model. The lower E a of the bimodal feedstock was attributed to its increased nucleation sites. These results provide the basis for dewaxing models-part of the rate-limiting step in powder injection molding-for SiC powder-binder systems. K E Y W O R D Sactivation energy, dewaxing, kinetics, powder injection molding, silicon carbide 86 | CHINN et al. How to cite this article: Chinn RE, Enneti RK, Kate KH, Atre SV. Kinetics of thermal dewaxing of injection-molded silicon carbide. Int J Ceramic Eng Sci. 2019;1:85-91. https ://doi.

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“…For bimodal feedstock in Figure , the curves converged at E a ≈ 60 kJ/mol. The best convergence in the solvent‐dewaxed feedstock was observed at E a ≈ 60 kJ/mol in both cases …”

Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Kinetics of thermal dewaxing of injection‐molded silicon carbide

Chinn

Enneti

Kate

et al. 2019

Int J Ceramic Engine & Sci

Self Cite

View full text Add to dashboard Cite

show abstract

“…Onbattuvelli et al studied the effects of nanoparticle addition on the debinding of two different materials which is injection molded aluminum nitride (AlN) [5] and also silicon carbide (SiC) [6] compacts. The experiments varying the solvent debinding condition were performed on microscale and micro-nanoscale of injection molded compacts.…”

Section: Introductionmentioning

confidence: 99%

Solvent Extraction Characterization on Injection Molding of Mg Alloy

et al. 2017

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Abstract. The effect of the leaching time and temperature on the solvent debinding process of Mg metal injection molding (MIM) green part has been investigated. In this study, both soluble binder, paraffin wax and stearic acid molecules were removed from the Mg MIM green part by immersing compact parts in heptane solution. Then, the solvent debinding rate has been investigated under the conditions of different leaching time and temperature. The weight loss percentages of paraffin wax and stearic acid were calculated and the pores structure was analyzed by scanning electron micrograph. The efficient diffusivity and activation energy of the soluble binder have also been studied. Result shows that the removal of soluble binder at high temperature is the fastest, but there are defects observed on the Mg MIM body. It was found that the total amount of binder removal was 68.24 wt.%, 75.56 wt.%, and 84.92 wt.% for leaching temperature of 40 ºC, 60 ºC, and 80 ºC, respectively. The remaining binder will be removed during first cycle of sintering process.

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