Effects of Polymer Decomposition Behavior on Thermal Debinding Process in Metal Injection Molding

1997 ◽  
Vol 12 (4) ◽  
pp. 681-690 ◽  
Author(s):  
Yoshimitsu Kankawa
Keyword(s):  
Injection Molding ◽  
Metal Injection Molding ◽  
Polymer Decomposition ◽  
Thermal Debinding ◽  
Decomposition Behavior ◽  
Debinding Process

Thermal Debinding Process of SS 17-4 PH in Metal Injection Molding Process with Variation of Heating Rates, Temperatures, and Holding Times

2017 ◽  
Vol 266 ◽  
pp. 238-244 ◽  
Author(s):  
Sugeng Supriadi ◽  
Bambang Suharno ◽  
Rizki Hidayatullah ◽  
Gerra Maulana ◽  
Eung Ryul Baek
Keyword(s):  
Injection Molding ◽  
Heating Rate ◽  
Crack Formation ◽  
Holding Time ◽  
Effect Of Temperature ◽  
Metal Injection Molding ◽  
Injection Molding Process ◽  
Mass Reduction ◽  
Thermal Debinding ◽  
Debinding Process

Generally, metal injection molding (MIM) method utilizes SS 17-4 PH as material for application of orthodontic bracket. One of the process of MIM is thermal debinding, which binder is eliminated by thermal energy. In this study, thermal debinding process is conducted with variation of temperature, i.e. 480, 510, and 540°C, holding time, i.e. 0.5, 1 and 2 hours, heating rate, i.e. 0.5, 1, 1.5, and 2°C/min.The effect of temperature shows that the increased temperature will result in the mass reduction percentage due to formation of oxide on the sample, which will be proven through TGA testing. The highest mass reduction was 6.4137 wt% which was obtained at 480°C. For the variation of holding time, the longer the holding time will result in increased mass reduction and the highest mas reduction was 6.255 wt% which was obtained during 2 hours of holding time. For the heating rate, the slower the heating rate will result in increased mass reduction and decreased the presence of crack formation. The best variable was obtained at heating rate of 0.5°C/min, which resulted mass reduction of 6.2488 wt% and less crack formation.

scholarly journals The Technological Design of Geometrically Complex Ti-6Al-4V Parts by Metal Injection Molding

2019 ◽  
Vol 9 (7) ◽  
pp. 1339 ◽  
Author(s):  
Shulong Ye ◽  
Wei Mo ◽  
Yonghu Lv ◽  
Zhanhua Wang ◽  
Chi Tat Kwok ◽  
...  
Keyword(s):  
Injection Molding ◽  
Cost Effective ◽  
Metal Injection Molding ◽  
Binder System ◽  
Prealloyed Powder ◽  
Low Viscosity ◽  
Blended Powder ◽  
Complex Shapes ◽  
Thermal Debinding ◽  
Decomposition Behavior

In this study, the metal injection molding (MIM) process is applied to produce Ti-6Al-4V parts using blended and prealloyed powders, respectively. The feedstocks are prepared from a polyformaldehyde-based binder system with a powder loading of 60 vol%, exhibiting a low viscosity. The decomposition behavior of the binders is investigated and the thermal debinding procedure is designed accordingly. The debound parts are subsequently sintered at 1200 and 1300 °C. The results show the mechanical properties of the sintered samples prepared from blended powder are comparable to those prepared from prealloyed powder, with yield strength of 810 MPa, ultimate tensile strength (UTS) of 927 MPa, and elongation of 4.6%. The density of the as-sintered samples can reach 4.26 g/cm3 while oxygen content is ~0.3%. Based on the results, watch cases with complex shapes are successfully produced from Ti-6Al-4V blended powder. The case gives a good example of applying metal injection molding to mass production of precise Ti-6Al-4V parts with complex shapes in a cost-effective way.

Characteristics of STS630 Based Metal Injection Molding Products on Powder Size, Sintering and Heat Treatment Conditions

2013 ◽  
Vol 372 ◽  
pp. 398-401
Author(s):  
Hee Jin Jeong ◽  
Hwan Kyun Yeo ◽  
Dae Yeol Bae ◽  
Je Hyun Kim ◽  
Dong Woo Kim ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Injection Molding ◽  
Sintering Temperature ◽  
Processing Condition ◽  
Metal Injection Molding ◽  
Powder Size ◽  
Optimal Processing ◽  
Treatment Conditions ◽  
Debinding Process

This study proposes the research method to examine through experiment the mechanical properties of final products based on the size and sintering temperature of powder particle during STS630 powder based metal injection molding and heat treatment processing condition after the sintering. The feedstock for the injection was manufactured based on STS630 powder with the diameter of 7.0±1.0μm and 8.0±1.0μm and the sintering was carried at 2 temperature conditions of 1300°C and 1355°C after the injection and debinding process. Heat treatment conditions of sample after the sintering were divided into 2 types thus final samples of total 8 cases were manufactured. Then, the 5 types of mechanical properties test were conducted. Optimal processing conditions for MIM molding and heat treatment of STS630 powder could be established based on it.

Debinding Process of Fe–6Ni–4Cu Compact Fabricated by Metal Injection Molding

2000 ◽  
Vol 39 (Part 1, No. 2A) ◽  
pp. 616-621 ◽  
Author(s):  
Jenn-Shing Wang ◽  
Shih-Pin Lin ◽  
Min-Hsiung Hon ◽  
Moo-Chin Wang
Keyword(s):  
Injection Molding ◽  
Metal Injection Molding ◽  
Debinding Process

Study of the Debinding Rate on MIM Parts Using Plasma Assisted Debinding

2008 ◽  
Vol 591-593 ◽  
pp. 229-234 ◽  
Author(s):  
W. da Silveira ◽  
Paulo A.P. Wendhausen ◽  
Aloísio Nelmo Klein
Keyword(s):  
Injection Molding ◽  
Mass Loss ◽  
Polymer System ◽  
Powder Injection ◽  
Influence Of Temperature ◽  
Metal Powder Injection Molding ◽  
Thermal Extraction ◽  
Thermal Debinding ◽  
Extraction Processes ◽  
Debinding Process

Binders based on mixtures of polymers and waxes are suitable both for solvent combined with thermal extraction, as well as for pure thermal debinding. The recently developed plasma-assisted debinding and sintering (PADS) process has been targeted, for historical reasons, on a wax-polymer system, appropriated for solvent combined with thermal extraction processes. This paper shows experimental results related to the debinding rate of parts produced by metal powder injection molding using the recently developed Plasma Assisted Debinding process. Influence of temperature and the ratio of cathodic area on the mass loss were studied.

Formation of TiO2 Thin Film on Antibacterial Metal Injection Molding Stainless Steel Orthodontic Bracket 17-4 PH Using Physical Vapor Deposition Method

2020 ◽  
Vol 846 ◽  
pp. 169-174
Author(s):  
Sugeng Supriadi ◽  
Annisa Ovilia ◽  
Nurul Ilmaniar ◽  
Bambang Suharno
Keyword(s):  
Thin Film ◽  
Injection Molding ◽  
Magnetron Sputtering ◽  
Physical Vapor Deposition ◽  
Antibacterial Properties ◽  
Metal Injection Molding ◽  
Orthodontic Bracket ◽  
Sputtering Power ◽  
Physical Vapor Deposition Method ◽  
Thermal Debinding

This study aims to equip orthodontic bracket SS 17-4 PH fabricated using metal injection molding with antibacterial properties. This can be achieved by applying TiO2 coating on the surface of brackets using magnetron sputtering PVD method. This method is chosen due to its compatibility to be used on bulk metal and its ability to control thin-film stoichiometry. Samples were prepared using the series of following steps which comprised of metal injection molding, binder elimination with solvent and thermal debinding, sintering in vacuum and argon atmosphere, electropolishing, and magnetron sputtering PVD coatings as the final stage. Negative bias, sputtering power, and partial pressure on vacuum chamber were set as the constant parameters. The atmosphere inside the PVD chamber was controlled using oxygen and argon gases. XRD and SEM observations were carried out to obtain the information on the phase and morphology of the films. Rutile and anatase crystalline structures with 2,27 nm and 9,78 nm crystal size were measured in as-deposited PVD TiO2 respectively. The deposition films were achieved in the range of 3 μm-8 μm.

Evaluation and Analysis of Distortion of Complex Shaped Ti-6Al-4V Compacts by Metal Injection Molding Process

2012 ◽  
Vol 520 ◽  
pp. 187-194 ◽  
Author(s):  
S. Virdhian ◽  
Toshiko Osada ◽  
Hyun Goo Kang ◽  
Fujio Tsumori ◽  
Hideshi Miura
Keyword(s):  
Injection Molding ◽  
Early Stage ◽  
Processing Technique ◽  
Metal Injection Molding ◽  
Injection Molding Process ◽  
Manufacturing Cost ◽  
Atactic Polypropylene ◽  
Molding Process ◽  
Specific Strength ◽  
Thermal Debinding

Titanium and its alloys have been widely used for medical and aerospace applications because of their excellent attributes of high specific strength, corrosion resistance, and biocompatibility. However, it is not easy to produce the complex shaped parts due to their poor castability and machinability. Metal injection molding (MIM) is one of suitable processing technique to produce the complex shaped parts in order to reduce the manufacturing cost. In this study, complex shaped Ti-6Al-4V compacts was prepared by MIM process for airplane application. The effects of high molecular binder content and different compact’s set-up during thermal debinding on the distortion of complex shaped compacts were measured and evaluated. The binder with 10 % APP (Atactic polypropylene) was found to have better shape retention for the parts. Furthermore the results indicate that high distortion occurs at early stage of thermal debinding process. The use of supports during thermal debinding can significantly reduce the distortion of the final parts.

Innovations in Micro Metal Injection Molding Process by Lost Form Technology

2007 ◽  
Vol 534-536 ◽  
pp. 369-372 ◽  
Author(s):  
Kazuaki Nishiyabu ◽  
Yasuhiro Kanoko ◽  
Shigeo Tanaka
Keyword(s):  
Injection Molding ◽  
Mold Insert ◽  
Production Method ◽  
Metal Injection Molding ◽  
Injection Molding Process ◽  
Stainless Steel 316L ◽  
Molding Process ◽  
Debinding Process ◽  
Micro Structures ◽  
Plastic Mold

The production method of micro sacrificial plastic mold insert metal injection molding, namely μ-SPiMIM process has been proposed to solve specific problems involving the miniaturization of MIM. The sacrificial plastic mold (SP-mold) with fine structures was prepared by injection-molding polymethylmethacrylate (PMMA) into Ni-electroform, which is a typical LIGA (Lithographie-Galvanoformung-Abformung) process. Stainless steel 316L feedstock was injectionmolded into the SP-mold which had micro structures with multi-pillars. The green compact was demolded as one component with the SP-mold, which was decomposed along with binder constituent of feedstock in debinding process. This study focused on the effects of metal particle size and processing conditions on the shrinkage, transcription and surface roughness of sintered parts, which were evaluated by SEM (Scanning Electron Microscope) observation.

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