Study on Binder System for Micro Powder Injection Molding of ZrO2 Ceramic

2012 ◽  
Vol 706-709 ◽  
pp. 1948-1954
Author(s):  
Lin Liu ◽  
X.L. Ni ◽  
Hai Qing Yin ◽  
Xuan Hui Qu
Keyword(s):  
Injection Molding ◽  
Large Scale ◽  
Dimensional Accuracy ◽  
Mold Filling ◽  
Powder Injection Molding ◽  
Powder Injection ◽  
Scale Production ◽  
Binder System ◽  
Widespread Application ◽  
Debinding Process

Micro powder injection molding has been accepted as a potential forming technology for large-scale production of miniature components in industries. However, mold filling capability is often poor due to the blind hole structure of the die cavity, which restricts the widespread application of this technique. In this paper, ZrO2 micro gears with addendum circle ranging from 900μm to 200μm were studied. Instead of using traditional PW-HDPE-SA binder as in powder injection molding, thermoplastic binder system is optimized here for better replication of micro gear. It is found that the dimensional accuracy and demold after injection molding can be improved by utilizing proper binder system. ZrO2 feedstock with a powder loading of 46vol.% and the binder system consisting of BW, HDPE and SA was successfully injection molded and demolded, which indicates good mold filling capability and sufficient demolding strength. The binder system was successfully removed by debinding process in two steps, solvent debinding followed by thermal debinding. Debound components free of defects were obtained. Keywords: Micro powder injection molding, ZrO2 feedstock, Binder system, Molding filling capability, Demolding strength

Metal and Ceramic Micro Components Made by Powder Injection Molding

2007 ◽  
Vol 534-536 ◽  
pp. 373-376 ◽  
Author(s):  
Volker Piotter ◽  
G. Finnah ◽  
B. Zeep ◽  
Robert Ruprecht ◽  
Jürgen Haußelt
Keyword(s):  
Injection Molding ◽  
Large Scale ◽  
Ceramic Materials ◽  
Powder Injection Molding ◽  
Tungsten Alloy ◽  
Powder Injection ◽  
Scale Production ◽  
Large Scale Production ◽  
Scope Of Application ◽  
Tungsten Powders

To overcome the lack of micro manufacturing processes suitable for medium and large scale production as well as to process high resistive materials a special variant of micro injection molding is currently under development: micro powder injection molding (MicroPIM), which already enables the manufacturing of finest detailed components with structure sizes down to a few ten micrometer. In order to expand the scope of application of MicroPIM, tests are being conducted with pure tungsten powders or tungsten alloy powders. As further improvement, micro twocomponent injection molding allows, for example, the fabrication of micro components consisting of two ceramic materials with different physical properties.

Net-Shape Manufacturing of Micro Porous Metal Components by Powder Injection Molding

2007 ◽  
Vol 534-536 ◽  
pp. 981-984 ◽  
Author(s):  
Kazuaki Nishiyabu ◽  
Satoru Matsuzaki ◽  
Shigeo Tanaka
Keyword(s):  
Injection Molding ◽  
Dimensional Accuracy ◽  
Porous Metal ◽  
Production Method ◽  
Powder Injection Molding ◽  
Powder Injection ◽  
Stainless Steel 316L ◽  
Metal Powder Injection Molding ◽  
Controlled Porosity ◽  
Metal Products

A novel production method for porous metal components has been developed by applying powder space holder (PSH) method to metal powder injection molding (MIM) process. The PSH-MIM method has an industrial competitive advantage that is capable of net-shape manufacturing the micro-sized porous metal products with complicated shapes and controlled porosity and pore size. In this study, the small impeller with homogeneous micro-porous structure was manufactured by the PSH-MIM method using porous compounds composed of fine stainless steel 316L powder and polymethylmethacrylate (PMMA) particle. The effects of combinations in size and fraction of PMMA particle on dimensional tolerance and variation of sintered porous specimens were investigated. It was concluded that the PSH-MIM method could manufacture commercially micro-porous metal components with high dimensional accuracy.

SIMULATION OF MOLD FILLING IN POWDER INJECTION MOLDING

Equipment ◽  
2006 ◽  
Author(s):  
S. K. Samanta ◽  
H. Chattopadhyay ◽  
M. M. Godkhindi ◽  
B. Pustal ◽  
R. Berger ◽  
...  
Keyword(s):  
Injection Molding ◽  
Mold Filling ◽  
Powder Injection Molding ◽  
Powder Injection

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.

Effects of binder system and processing parameters on formability of porous Ti/HA composite through powder injection molding

2015 ◽  
Vol 87 ◽  
pp. 386-392 ◽  
Author(s):  
Muhammad Rafi Raza ◽  
Abu Bakar Sulong ◽  
Norhamidi Muhamad ◽  
Majid Niaz Akhtar ◽  
Javad Rajabi
Keyword(s):  
Injection Molding ◽  
Processing Parameters ◽  
Powder Injection Molding ◽  
Powder Injection ◽  
Binder System ◽  
Porous Ti
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