Removal of Paraffin Wax Binder from Metal Injection Molded Part by Supercritical Fluids

Kim, Yong Ho; Yoo, Ki‐Pung; Lim, Jong Sung; Lee, Yeim

doi:10.1081/ss-120030774

Cited by 5 publications

(4 citation statements)

References 14 publications

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“…As a green solvent, CO 2 is used in many chemical processes [10]. Some of our previous works also used supercritical CO 2 as a green solvent: we used supercritical CO 2 for an extraction process [11], a supercritical anti-solvent process [12] and a cloud point measurement experiment [13].…”

Section: Introductionmentioning

confidence: 99%

High-pressure phase behavior of binary mixtures containing methylpyrrolidinium derivative ionic liquids and carbon dioxide

Kim

Yim

Lim

2012

Fluid Phase Equilibria

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Section: Introductionmentioning

confidence: 99%

High-pressure phase behavior of binary mixtures containing methylpyrrolidinium derivative ionic liquids and carbon dioxide

Kim

Yim

Lim

2012

Fluid Phase Equilibria

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“…For such application, carbon dioxide may be used as a medium for wax transportation into the formation. Several patents and publications describe the removal of lubricants from metal or molded surfaces , by SC–CO 2 . It was implemented for cleaning sludge from the bottom of oil tanks and refinery stock from water, dust, and sand.…”

Section: Introductionmentioning

confidence: 99%

“…Another patent by Reich et al represents a process for separating solid particles from used rolling oil by supercritical CO 2 at the optimal temperature of 40 °C and a pressure of 31 MPa. Kim et al reported about more than 90 wt % of paraffin extraction from a metal surface at 25 MPa of pressure and temperatures of 65–75 °C.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Scheme of Supercritical Carbon Dioxide Extraction of Heavy Hydrocarbon Mixture in (Pressure; Temperature; Recovery) Coordinates

Rudyk

Spirov

2013

Energy Fuels

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A heavy hydrocarbon mixture represented by C 17 −C 31 carbon groups was investigated to determine extraction recoveries by supercritical carbon dioxide in the ranges of 12−65 MPa for pressure and 50−90°C for temperature. The purpose of the study was to obtain a three-dimensional scheme of the SC−CO 2 /heavy hydrocarbon mixture system in pressure− temperature−recovery coordinates, which allows the prediction and numerical modeling of phase behavior. At lower temperatures, high recoveries were attained at lower pressures. The highest recovery of 93% was obtained at 70°C and 56 MPa. The recoveries greater than 65% were determined at the breakover points where the pressure increased by 7 MPa with a temperature increase of 10°C. The phase envelope, 3D scheme, and the equations describing the boundaries of the system are presented.

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“…These factors lead to long processing debinding times and have prompted the development of different debinding techniques. The techniques include wicking [10], solvent [11], thermal [12], catalytic [13] and supercritical debinding [14]. Amongst the latter techniques, thermal debinding has always been the most widely used and up to now still irreplaceable method due to its versatility and simplicity [15].…”

Section: Introductionmentioning

confidence: 99%

Determination of Optimum Process for Thermal Debinding and Sintering Using Taguchi Method

Seerane

Chikwanda

Machaka

2015

MSF

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Debinding involves long and delicate processing periods of removing binder components from a green body after injection moulding; failure to completely remove the binder components results in distortion, cracking, blisters and contamination at elevated temperatures. This study focuses on optimising thermal debinding process parameters on the basis of obtaining a defect-free part after sintering and also determining a sintering time that gives high sintering density. Thermal debinding was conducted after solvent debinding. The feedstock used to produce green compacts composed of Ti6Al4V powder and a wax-based binder. The binder’s backbone component is a low density polyethylene (LDPE). Careful selection of thermal debinding parameters was guided by thermo-gravimetric analysis (TGA) results. The Taguchi method was used to determine an optimum debinding process. Thermally debound compacts were analysed for residual binder using a TGA. Archimedes’ principle and optical microscopy were done to analyse the sintering density and microstructure of the sintered product, respectively. Optimum debinding and sintering conditions were identified. The study demonstrated that heating rate during debinding was the most influential factor that contributes to minimum residual binder followed by debinding dwell time and temperature. Longer sintering time of 4 h favoured higher density of 91.6 ±1.55%. A typical radial shrinkage level of 11.1 ±0.0816% was determined.

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Removal of Paraffin Wax Binder from Metal Injection Molded Part by Supercritical Fluids

Cited by 5 publications

References 14 publications

High-pressure phase behavior of binary mixtures containing methylpyrrolidinium derivative ionic liquids and carbon dioxide

High-pressure phase behavior of binary mixtures containing methylpyrrolidinium derivative ionic liquids and carbon dioxide

Three-Dimensional Scheme of Supercritical Carbon Dioxide Extraction of Heavy Hydrocarbon Mixture in (Pressure; Temperature; Recovery) Coordinates

Determination of Optimum Process for Thermal Debinding and Sintering Using Taguchi Method

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