Micro Metal Injection Molding Using Hybrid Micro/Nano Powders

2007 ◽  
Vol 534-536 ◽  
pp. 381-384 ◽  
Author(s):  
Kazuaki Nishiyabu ◽  
Kenichi Kakishita ◽  
Shigeo Tanaka
Keyword(s):  
Particle Size ◽  
Tensile Strength ◽  
Injection Molding ◽  
Binder Content ◽  
Metal Injection Molding ◽  
Molding Machine ◽  
Melt Viscosity ◽  
Nano Scale ◽  
Microstructure Density ◽  
Trial Efficiency

This study aims to investigate the effects of hybrid micro/nano powders in a micro metal injection molding (μ-MIM) process. A novel type of mixing-injection molding machine was used to produce tiny specimens (<1mm in size) with high trial efficiency using a small amount of feedstock (<0.05cm3 in volume). Small dumbbell specimens were produced using various feedstocks prepared by changing binder content and fraction of nano-scale Cu powder (130nm in particle size). The effects of adding the fraction of nano-scale Cu powder on the melt viscosity of the feedstock, microstructure, density and tensile strength of sintered parts were discussed.

Preparation of Aluminum Feedstock for Green Part Specimen Using Metal Injection Molding

2013 ◽  
Vol 465-466 ◽  
pp. 1250-1254 ◽  
Author(s):  
Hafeiz Saidin ◽  
M. Azuddin
Keyword(s):  
Injection Molding ◽  
Paraffin Wax ◽  
Metal Injection Molding ◽  
Sudden Increase ◽  
Binder System ◽  
Molding Machine ◽  
Metal Composition ◽  
Binder Composition ◽  
Wax Content ◽  
Process Ability

In metal injection molding, to identify the homogenous aluminum based feedstock is a challenging issues. In this study, a metal injection molding of aluminum feedstock which contains of high density polyethylene, stearic acid and paraffin wax as binder system was performed. The feedstock are used to produce tensile and gear shape green specimens using injection molding machine. The process ability of the metal injection molding feedstock depends on different parameters such as their binder composition and amount of metal powder used. From this study, the percentage of volume shrinkage experienced a sudden increase at the metal composition more than 50%. It also shown that, the paraffin wax content, affects the feedstock performances.

Metal Injection Molding Method of Ni-Free Austenitic Stainless Steel II - Microstructure and Mechanical Properties

2007 ◽  
Vol 26-28 ◽  
pp. 19-22
Author(s):  
Midori Komada ◽  
Yoshikazu Kuroda ◽  
Ryo Murakami ◽  
Noriyuki Tsuchida ◽  
Yasunori Harada ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Surface Layer ◽  
Injection Molding ◽  
Nitrogen Content ◽  
Tensile Tests ◽  
Metal Injection Molding ◽  
Homogeneous Microstructure ◽  
Molding Method ◽  
Microstructure And Mechanical Properties

Microstructure and mechanical properties of high nitrogen steels whose chemical composition were Fe-17Cr-12Mn-3Mo and that was produced by using metal injection molding method and nitrogen absorption methods were examined. A compact which is furnace cooled from 1573 K has a brittle surface layer with high chromium and nitrogen contents but the surface layer disappears when the compact is held at 1473 K. The compact which is furnace cooled at 1473 K is observed precipitates in the grains and the grain boundary, while the compact which is quenched at 1473 K shows homogeneous microstructure. In the heat treatments at 1473 K for 2, 5, and 10 h, the nitrogen content becomes higher with increasing of holding time. In the holding times of 5 and 10 h, the microstructure is austenite. In the tensile tests, tensile strength becomes larger with increasing of nitrogen content. In the specimen which is conducted the heat treatment at 1473 K for 10 h, tensile strength is about 1,000 MPa and elongation is 80 %, which shows better balance of strength and elongation than SUS304 and SUS316 steels.

Binder System for Coarse Powders Processed by Metal Injection Molding (MIM)

2008 ◽  
Vol 591-593 ◽  
pp. 169-173
Author(s):  
A.P.G. Nogueira ◽  
Ricardo Machado ◽  
Paulo A.P. Wendhausen ◽  
Diego Fernando Portaluppi
Keyword(s):  
Particle Size ◽  
Injection Molding ◽  
Dimensional Accuracy ◽  
Melt Flow Index ◽  
Metal Injection Molding ◽  
Flow Index ◽  
Binder System ◽  
Sintered Part ◽  
Dimensional Deviation ◽  
Modified Binder

Research on determined alloys produced by metal injection molding has been done for cost reduction purposes through the use of powders with bigger particle size. However, regarding feedstock homogeneity, certain limitations are presented when coarse particles are used. For instance, homogeneity strongly influences rheological behavior of the feedstock and dimensional control of the sintered part. Therefore, the purpose of this work was to evaluate effectiveness of a modified binder system with the addition of a surfactant polymer which makes the feedstock more homogeneous. This study was carried out on a FeNiP alloy currently processed by MIM, where 50%wt of the iron powder was replaced with course powder having a particle size distribution of D90 less than 47 ,m. Effectiveness of binder systems using a Melt Flow Index (MFI) and the behavior of dimensional accuracy at sintered part were analyzed. Results showed more feedstock homogeneity and less dimensional deviation when a surfactant agent was used.

Advantages of Micro Metal Injection Molding by Minute Mixing-Injection Molding Machine

2004 ◽  
Vol 2004.12 (0) ◽  
pp. 81-82
Author(s):  
Kazuaki NISHIYABU ◽  
Kenichi KAKISHITA ◽  
Akio YUZUKI ◽  
Toshiko OSADA ◽  
Shigeo TANAKA
Keyword(s):  
Injection Molding ◽  
Metal Injection Molding ◽  
Molding Machine ◽  
Injection Molding Machine

Optimisation of Processing Condition Using Taguchi Method on Strength of HDPE-Natural Fibres Micro Composite

2014 ◽  
Vol 660 ◽  
pp. 33-37 ◽  
Author(s):  
Mohd Halim Irwan Ibrahim ◽  
M.Z. Zainol ◽  
Mohd Hilmi Othman ◽  
Azriszul Mohd Amin ◽  
Rosli Asmawi ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Injection Molding ◽  
Optimum Parameter ◽  
Natural Fiber ◽  
Processing Condition ◽  
Hardness Test ◽  
Taguchi Methods ◽  
Parameter Setting ◽  
Molding Machine ◽  
Molding Parameter

Injection molding usually uses to produce part from plastic. Other than it is cheap, it also can produce part in large quantity. In this paper, Taguchi Methods was used to define the optimization of process parameter for an injection molding machine to produce a dumbbell product from High-density Polyethylene (HDPE) + natural fiber (Kenaf). Taguchi Methods with L9-34 approaches will be used in this work. Four different formulation of material will be tested to find the best formulation and its parameter setting. Here, an orthogonal array (OA), signal-to-noise (S/N) ratio and analysis of variance (ANOVA) are employed to analyze the effect of injection molding parameter. The significant of formulation and parameter setting from injection molding through the hardness and the strength value of the specimen. Furthermore, test will be conducted through hardness test and tensile test. Changes in the parameter setting will give different hardness and tensile strength value. The optimum parameter setting was set base on the S/N ratio. For each formulation, it has their optimum parameter setting for hardness and for tensile strength. The optimum parameter setting was predicting their S/N ratio using Minitab software.

Fabrication of Ti-6Al-7Nb Alloys by Metal Injection Molding

2007 ◽  
Vol 534-536 ◽  
pp. 357-360 ◽  
Author(s):  
Yoshinori Itoh ◽  
Hideshi Miura ◽  
Kenji Sato ◽  
Mitsuo Niinomi
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Injection Molding ◽  
Metal Injection Molding ◽  
Injection Molding Process ◽  
Al Alloy ◽  
Molding Process ◽  
The Third

The metal injection molding process was applied to produce Ti-6Al-7Nb alloys using 3 types of mixed powders. The first is a mixture of Ti and Al-Nb pre-alloyed powders, the second is a mixture of Ti, Ti-Al alloy and Nb powders, and the third is a mixture of elemental powders of Ti, Al and Nb. The sintered compacts using the first and second powders showed higher density and mechanical properties than the compacts using the third powder which showed many large pores formed due to the dissolution of Al particles during the sintering steps. Eventually, the compacts using a mixture of Ti+Al-Nb or Ti+Ti-Al+Nb powders showed tensile strength of above 800MPa and elongation of above 10%, which are similar to the properties of wrought materials.

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