Rheological and thermal debinding properties of blended elemental Ti-6Al-4V powder injection molding feedstock

Lin, Dongguo; Sanétrník, Daniel; Cho, Hanlyun; Chung, Seong Taek; Kwon, Young Sam; Kate, Kunal H.; Hausnerová, Berenika; Atre, Sundar V.; Park, Seong Jin

doi:10.1016/j.powtec.2016.12.071

Cited by 47 publications

(22 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A third method for calculating the activation energy from constant heating rate TGA data is the order‐independent derivative model devised by Kissinger . Kissinger used differential thermal analysis data, but his model has also been applied to TGA data . The characteristic temperature T max corresponds to the point where the conversion rate d α/ d t reaches a maximum and d 2 α/ d t 2 = 0.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

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

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.

show abstract

Section: Methodsmentioning

confidence: 99%

“…Lin et al evaluated the thermal decomposition kinetics of a binder system for titanium alloy powders of φ = 6 4‐67 vol%. The E a of the paraffin‐PP‐polyethylene‐SA binder was 64‐65 kJ/mol for the paraffin component by the Kissinger model.…”

Section: Introductionmentioning

confidence: 99%

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

“…It is then cooled to a liquid state (3) and directed towards a pump (4) that controls the pressure. When it reaches the pressure needed for a supercritical state (up to the critical point, see Figure 2b), the carbon dioxide is heated by a heat exchanger (5). At the supercritical state, the CO2 is directed towards the autoclave (6), which contains the components (7).…”

Section: Methodsmentioning

confidence: 99%

“…has an important influence on the final components [4]. Therefore, as important features of the process, the mixing conditions and thermal-physical characteristics must be identified [5]. The binder must support the powder load and binder within the compact.…”

Section: Introductionmentioning

confidence: 99%

Modelling and numerical simulation of Supercritical CO2 debinding of Inconel 718 components elaborated by Metal Injection Molding

Agne

Barrière

2017

Applied Sciences

View full text Add to dashboard Cite

Featured Application: The numerical simulation of the debinding step by using a supercritical fluid is used to predict the binder extraction to optimize the component's shape.Abstract: A debinding step using the supercritical state of a fluid has been increasingly investigated for extracting organic binders from components obtained by metal-injection molding. It consists of placing the component in an enclosure subjected to pressure and temperatures higher than the critical point to perform polymer extraction of the Metal-injection molding (MIM) component. It is an alternative to conventional solvent debinding. The topic of this study is to model and simulate the supercritical debinding stage to elucidate the mechanism of polymer degradation and stabilization with a three-dimensional model. Modelling this extraction process would optimize the process on an industrial scale. It can be physically described by Fick's law of diffusion. The model's main parameter is the diffusion coefficient, which is identified by using linear regression based on the least-squares method. In the model, an effective length scale is specially developed to take into account the diffusion in all directions. The tests were performed for extracting polyethylene glycol, an organic additive, using supercritical CO 2 in injected components. The feedstock is composed of polypropylene, polyethylene glycol, and stearic-acid as binder mixed with Inconel 718 super-alloy powders. The identified parameters were used to calculate the diffusion coefficient and simulate the supercritical debinding step on the Comsol Multiphysics ® finite-element software platform to predict the remaining binder. The obtained numerical simulation results are in good agreement with the experimental data. The proposed numerical simulations allow for the determination of the remaining polyethylene glycol (PEG) binder distribution with respect to processing parameters for components during the supercritical debinding process at any time. Moreover, this approach can be used in other formulation, powder, and binder systems.

show abstract

“…While Ti64 is extensively used in the aerospace industry, the high quality standards required for application of any component in aerospace, means the MIM process faces significant hurdles before it can be accepted by this industry. Nonetheless, research has demonstrated that it is possible for the MIM process to manufacture Ti64 components with superior mechanical properties close to the ASTM standard range [5,43,51,100,101] especially by small addition of other elements such as B [43,45], C [71], Gd [58] and TiC [81]. However, most research work on MIM of Ti64 alloy has been specifically designed for biomedical applications [43,83,102] rather than other applications such as aerospace.…”

Section: Figure 6 Microstructure Of Mim Proceed Cp-ti Samples From Amentioning

confidence: 99%

Metal injection moulding of titanium and titanium alloys: Challenges and recent development

et al. 2017

View full text Add to dashboard Cite

Rheological and thermal debinding properties of blended elemental Ti-6Al-4V powder injection molding feedstock

Cited by 47 publications

References 24 publications

Kinetics of thermal dewaxing of injection‐molded silicon carbide

Kinetics of thermal dewaxing of injection‐molded silicon carbide

Modelling and numerical simulation of Supercritical CO2 debinding of Inconel 718 components elaborated by Metal Injection Molding

Metal injection moulding of titanium and titanium alloys: Challenges and recent development

Contact Info

Product

Resources

About