Advantages and Limitations of Using Nano Sized Powders for Powder Injection Molding Process: A Review

2012 ◽  
Vol 59 (2) ◽  
Author(s):  
Javad Rajabi ◽  
Norhamidi Muhamad ◽  
Abu Bakar Sulong ◽  
Abdolali Fayyaz ◽  
Azizah Wahi
Keyword(s):  
Injection Molding ◽  
Large Scale ◽  
Sintering Temperature ◽  
High Surface ◽  
Volume Ratio ◽  
Powder Injection Molding ◽  
Nano Particles ◽  
Powder Injection ◽  
Injection Molding Process ◽  
Molding Process

Powder injection molding (PIM) is among the most known forming techniques that use material powders. This technique has been widely evaluated for the production of large scale and small components using metal and ceramic powders. Nano particles have larger surface-to-volume ratio compared with large-sized particles, thus they display high surface area. Some merits in the application of nano-sized particles in the PIM process includes increasing its comparative density at a low sintering temperature, decreasing sintering temperature, decreasing grain size of sintered bodies, increasing hardness value, and improving surface properties. However, it also has several disadvantages, which include increasing the viscosity behaviour of feedstock, oxidation, and agglomeration. This article reviews current studies on the effects of nano-sized particles on the PIM process and finding solutions to address its disadvantages.

Powder Injection Molding of Copper and the Effect of Sintering Temperature on Its Mechanical Properties

2010 ◽  
Author(s):  
Ali Keshavarz Panahi ◽  
Hossein Khoshkish
Keyword(s):  
Injection Molding ◽  
Copper Powder ◽  
Sintering Temperature ◽  
Powder Injection Molding ◽  
Powder Injection ◽  
Injection Molding Process ◽  
Capillary Rheometer ◽  
Molding Process ◽  
Molding Method ◽  
Different Temperatures

In this article, the fabrication steps of copper parts, using the powder injection molding method have been investigated. For the purpose of this study, first, several feedstocks were prepared by mixing copper powder (in volume percentages of 60, 64, 68, and 72%) and a thermoplastic binder. Due to the sensitivity of the mixing stage in the powder injection molding process, the Extrumixing method was utilized to appropriately mix the copper powder with the binder. Rheological characteristics of the different feedstocks were analyzed by means of a capillary rheometer. Based on this analysis, the feedstock having a 68 vol. % copper powder was selected as the optimum powder, out of which, samples shaped like tensile test specimens were successfully molded. These samples were later debinded by the solvent debinding method. Sintering of the pieces was carried out at different temperatures. Research showed that raising the sintering temperature leads to an increase of density and tensile strength of the specimens.

Powder Injection Molding of Ti-6Al-4V Alloy for Defect-Free High Performance Titanium Parts with Low Carbon/Oxygen Contents

2018 ◽  
Vol 770 ◽  
pp. 189-194
Author(s):  
Dong Guo Lin ◽  
Jae Man Park ◽  
Tae Gon Kang ◽  
Seong Taek Chung ◽  
Young Sam Kwon ◽  
...  
Keyword(s):  
Injection Molding ◽  
Alloy Powder ◽  
High Performance ◽  
Physical And Mechanical Properties ◽  
Powder Injection Molding ◽  
Powder Injection ◽  
Solid Loading ◽  
Injection Molding Process ◽  
Low Carbon ◽  
Molding Process

In this work, powder injection molding (PIM) of Ti-6Al-4V alloy powder has been studied. Defect-free high performance Ti-6Al-4V parts with low carbon/oxygen contents have been successfully prepared by PIM. A pre-alloyed Ti-6Al-4V alloy powder and wax-polymer binder system have been mixed together to prepare the feedstock. In mixing stage, the solid loading percentage and mixing conditions have been optimized. Rheological and thermal debinding behaviors of prepared feedstock have been characterized and numerically expressed based on rheometry and thermal gravity experimental results. In addition, the injection molding process of Ti-6Al-4V parts has been numerically analyzed to optimize the injection molding conditions. Consequently, the defect-free Ti-6Al-4V parts with low carbon and oxygen contents have been successfully fabricated by PIM, which exhibits excellent physical and mechanical properties.

scholarly journals Holding Pressure and Its Influence on Quality in PIM Technology

10.14311/1608 ◽  
2012 ◽  
Vol 52 (4) ◽  
Author(s):  
Pavel Petera
Keyword(s):  
Phase Separation ◽  
Injection Molding ◽  
Density Measurement ◽  
Powder Injection Molding ◽  
New Method ◽  
Powder Injection ◽  
Injection Molding Process ◽  
Molding Process

The PIM (powder injection molding) process consists of several steps in which faults can occur. The quality of the part that is produced usually cannot be seen until the end of the process. It is therefore necessary to find a way to discover the fault earlier in the process. The cause of defects is very often “phase separation” (inhomogeneity in powder distribution), which can also be influenced by the holding pressure. This paper evaluates the powder distribution with a new method based on density measurement. Measurements were made using various holding pressure values.

Soft Ferrite Material by Powder Injection Molding Process for Power Electronics

2020 ◽  
Vol 56 (12) ◽  
pp. 1-7
Author(s):  
U. Soupremanien ◽  
J.-S. Ngoua-Teu ◽  
P. Sallot ◽  
C. Delafosse ◽  
G. Delette
Keyword(s):  
Injection Molding ◽  
Power Electronics ◽  
Powder Injection Molding ◽  
Powder Injection ◽  
Injection Molding Process ◽  
Molding Process ◽  
Ferrite Material ◽  
Soft Ferrite
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