Effect of powder loading on local feedstock injection behavior for fabrication process of orthodontic bracket SS 17-4 PH using metal injection molding

2019 ◽  
Author(s):  
B. Suharno ◽  
F. A. Mawardi ◽  
S. Dewantoro ◽  
B. Irawan ◽  
M. Doloksaribu ◽  
...  
Keyword(s):  
Injection Molding ◽  
Fabrication Process ◽  
Metal Injection Molding ◽  
Orthodontic Bracket

Debinding Rate Enhancement of 17-4 Precipitation Hardening Stainless Steel Solvent Debinding on Metal Injection Molding Process as the Material for Orthodontic Bracket

2018 ◽  
Vol 929 ◽  
pp. 200-208 ◽  
Author(s):  
Sugeng Supriadi ◽  
Deni Ferdian ◽  
Gerra Maulana ◽  
Rizki Hidayatullah ◽  
Bambang Suharno
Keyword(s):  
Surface Roughness ◽  
Injection Molding ◽  
Investment Casting ◽  
Removal Rate ◽  
Metal Injection Molding ◽  
Injection Molding Process ◽  
Vacuum Furnace ◽  
Molding Process ◽  
Orthodontic Bracket ◽  
Binder Removal

Brackets fabrication should be done by a suitable process to produce great result. Processes commonly used are investment casting, machining, and metal injection molding. Investment Casting has a drawback in which the surface roughness is quite high for the standard of brackets and require further processing. Machining is done by removing unwanted part to get desire shape, whereas bracket shape requires a high accuracy and is quite complicated. In Metal Injection Molding, feedstock is injected into a mold where complicated shapes can be achieved with a better surface roughness. The weakness is the stages within the process are quite long. One of the problem is the efficiency of debinding stage. We conducted an experiment to enhance binder removal rate through solvent debinding with stirring and under vacuum condition. Sample use for this experiment is a cubic shape of 0.5 x 0.5 x 0.5 cm3. Experiment is done on magnetic stirrer and in vacuum furnace. The temperature is hold at 50°C. Drying process afterward is done in the vacuum furnace for 1 hour with temperature around 50°C. Amount of binder left is confirmed by STA and the particle morphology is seen by SEM. Results showed that stirring treatment enhances binder removal rate due to stirring mechanism that causes possibility of collisions between particles increases. Binder removal rate on the vacuum treatment has a mechanism similar to stirring, but with the addition of the solvent to be done on a regular basis due to decrease of solvent boiling point under vacuum. There were no cracks found on the surface with an increased rate of debinding. Stirring is use for experiment with sample of actual bracketorthodontic form. Debinding rate of the bracket sample is faster than the cubic sample. This result is affected by the dissimilarity on the volume to surface area.

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.

Vacuum Sintering Process in Metal Injection Molding for 17-4 PH Stainless Steel as Material for Orthodontic Bracket

2017 ◽  
Vol 266 ◽  
pp. 231-237 ◽  
Author(s):  
Bambang Suharno ◽  
Deni Ferdian ◽  
Hantoro Restucondro Saputro ◽  
Lingga Pradinda Suharno ◽  
Eung Ryul Baek ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Injection Molding ◽  
Metal Injection Molding ◽  
Sintering Process ◽  
Vacuum Sintering ◽  
Orthodontic Bracket ◽  
Different Temperatures ◽  
The Common ◽  
Common Problems ◽  
Increasing Temperature

Malocclusion is one of the common problems encountered in the teeth and mouth of Indonesian people. This country is also confronted with problems that the bracket have to been imported from abroad. The purpose of this study is to produce national orthodontic bracket by metal injection molding (MIM) process in Indonesia, particularly by using vacuum sintering for 17-4 PH stainless steel because it is a material commonly used for orthodontic bracket. Sintering conducted at four different temperatures, at 1320 °C, 1340 °C, 1360 °C, and 1380 °C. The results showed that there are inclusions in sintering products. The relative density increases with increasing temperature sintering because the area of porosity are reduced. In addition, the results of sintering at 1360 °C has optimal hardness, which is amounted to 395 HV and higher than commercial bracket.

Preparation and Mechanical Properties of Inconel718 Alloy by Metal Injection Molding

2010 ◽  
Vol 39 (5) ◽  
pp. 775-780 ◽  
Author(s):  
Hu Youhua ◽  
Li Yimin ◽  
He Hao ◽  
Lou Jia ◽  
Tang Xiao
Keyword(s):  
Mechanical Properties ◽  
Injection Molding ◽  
Metal Injection Molding

Application of Taguchi Method for Parameters Optimization in Micro Metal Injection Molding

2011 ◽  
Vol 52-54 ◽  
pp. 244-248
Author(s):  
Haw Pei Li ◽  
Norhamidi Muhamad ◽  
Abu Bakar Sulong ◽  
Heng Shye Yunn ◽  
Hooman Abolhasani
Keyword(s):  
Injection Molding ◽  
Signal To Noise Ratio ◽  
Steel Powder ◽  
Mold Temperature ◽  
Parameters Optimization ◽  
Simultaneous Optimization ◽  
Metal Injection Molding ◽  
Surface Appearance ◽  
Optimal Injection ◽  
Acetate Butyrate

Optimization of injection parameters in Micro Metal Injection Molding (μMIM) was described in this study. Stainless steel powder was mixed with Polyethelena Glycol (PEG), Polymethyl Methacrilate (PMMA) and Cellulose Acetate Butyrate (CAB) to produce feedstock. Design of Experiments (DOE) of Taguchi L-27 (313) orthogonal array technique has been used to investigate the significance and optimal injection molding parameters. The signal-to-noise ratio and analysis of variance (ANOVA) are applied to study the optimum levels and effects of process parameters. Simultaneous optimization to obtain the highest green density and excellent surface appearance was discussed. The result concluded that the mold temperature (D) is the most statistically significant process parameter and its contribution to the best appearance and density is the highest.

Metal injection molding: 3D modeling of nonisothermal filling

2002 ◽  
Vol 42 (4) ◽  
pp. 760-770 ◽  
Author(s):  
Florin Ilinca ◽  
Jean-François Hétu ◽  
Abdessalem Derdouri ◽  
James Stevenson
Keyword(s):  
Injection Molding ◽  
3D Modeling ◽  
Metal Injection Molding

Optimization and evaluation of metal injection molding by using X-ray tomography

2015 ◽  
Vol 104 ◽  
pp. 107-115 ◽  
Author(s):  
Shidi Yang ◽  
Ruijie Zhang ◽  
Xuanhui Qu
Keyword(s):  
Injection Molding ◽  
Metal Injection Molding ◽  
X Ray
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