Specific volume and features of compressibility during the molding of powder-polymer mixtures with wax-polypropylene binder

2019 ◽  
pp. 25-33
Author(s):  
Alexander Muranov ◽  
Alexey Semenov ◽  
Anatoly Kutsbakh ◽  
Boris Semenov
Keyword(s):  
Phase Transition ◽  
Comparative Analysis ◽  
Powder Metallurgy ◽  
Injection Molding ◽  
Polymer Binder ◽  
Polymer Mixture ◽  
Powder Injection ◽  
Polymer Mixtures ◽  
Pvt Data ◽  
Mathematical Processing

The article discusses one of the modern areas of powder metallurgy – the technology of manufacturing shaped parts by the powder injection molding (PIM). For the powder-polymer mixture (feedstock) with a wax-polypropylene binder of the solvent-thermal type of removal by isobaric volume dilatometry, the dependence of PVT state parameters was studied. For each component of the polymer binder, the dependence of pressure on the temperature of phase transition was obtained. As a result of mathematical processing and analysis of PVT data for the feedstock of the studied type, a technological window of parameters has been determined that allows injection molding of «green parts» with minimal volume shrinkage. The results of a comparative analysis of the compaction of feedstock with a polymer binder catalytic and solution-thermal type of removal are presented.

Innovative Metal Injection Molding (MIM) Method for Producing CoCrMo Alloy Metallic Prosthesis for Orthopedic Applications

2014 ◽  
Vol 879 ◽  
pp. 102-106
Author(s):  
Noorsyakirah Abdullah ◽  
Mohd Afian Omar ◽  
Shamsul Baharin Jamaludin ◽  
Nurazilah Mohd Zainon ◽  
Norazlan Roslani ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Injection Molding ◽  
High Performance ◽  
Slip Casting ◽  
Plastic Injection Molding ◽  
Metal Injection Molding ◽  
Powder Injection ◽  
Powder Metallurgy Process ◽  
The Cost ◽  
Plastic Injection

Powder injection molding (PIM) is a powder metallurgy process currently used for the production of complicated and near net shape parts of high performance materials [. This technique basically combines the advantages of plastic injection molding and the versatility of the conventional powder metallurgy technique. The process overcomes the shape limitation of powder compaction, the cost of machining, the productivity limits of isostatic pressing and slip casting, and the defect and tolerance limitations of conventional casting [1, 2, . According to German and Bose [, the technology of metal injection molding (MIM) is more complicated than that of the plastic injection molding, which arises from the need to remove the binder and to densify and strengthen the part. The process composed of four sequential steps: mixing of the powder and organic binder, injection molding, debinding where all binders are removed and sintering [1, 2, 3, 4]. If it necessary, secondary operations such as heat treatments after sintering can be performed [1, 2, 3, 4, .

The Effect of Nanoparticles on the Processing and Properties of Aluminum Nitride by Powder Injection Molding

2011 ◽  
Author(s):  
Valmikanathan P. Onbattuvelli ◽  
Sundar V. Atre ◽  
Timothy McCabe ◽  
Sachin Laddha
Keyword(s):  
Injection Molding ◽  
Aluminum Nitride ◽  
Powder Processing ◽  
Powder Injection Molding ◽  
Powder Injection ◽  
Injection Molding Process ◽  
Polymer Mixtures ◽  
Molding Process ◽  
Dimensional Precision ◽  
Wide Range

Aluminum nitride (AlN) exhibits many functional properties that are relevant to applications in electronics, aerospace, defense and automotive industries. However, the successful translation of these properties into final applications lies in the net-shaping of ceramics into fully dense microstructures. Increasing the packing density of the starting powders is one effective route to achieve high sintered density and dimensional precision. The present paper presents an in-depth study on the effects of nanoparticle addition on the powder injection molding process (PIM) of AlN powder-polymer mixtures. In particular, bimodal mixtures of nanoscale and sub-micrometer particles were found to have significantly increased powder packing characteristics (solids loading) in the powder-polymer mixtures. The influence of nanoparticle addition on the multi-step PIM process was examined. The above results provide new perspectives which could impact a wide range of materials, powder processing techniques and applications.

Measurements of Powder–Polymer Mixture Properties and Their Use in Powder Injection Molding Simulations for Aluminum Nitride

JOM ◽  
2012 ◽  
Vol 64 (9) ◽  
pp. 1048-1058 ◽  
Author(s):  
Kunal H. Kate ◽  
Valmikanathan P. Onbattuvelli ◽  
Ravi K. Enneti ◽  
Shi W. Lee ◽  
Seong-Jin Park ◽  
...  
Keyword(s):  
Injection Molding ◽  
Aluminum Nitride ◽  
Powder Injection Molding ◽  
Polymer Mixture ◽  
Powder Injection

RHEOLOGICAL BEHAVIOR OF POWDER-POLYMER MIXTURES AND MODEL DESCRIPTION OF FEEDSTOCK VISCOSITY FOR NUMERICAL SIMULATION OF INJECTION MOLDING PROCESS

2021 ◽  
pp. 32-42
Author(s):  
A.A. Kutsbakh ◽  
◽  
A.N. Muranov ◽  
B.I. Semenov ◽  
A.B. Semenov ◽  
...  
Keyword(s):  
Injection Molding ◽  
Rheological Behavior ◽  
Polymer Composition ◽  
Powder Injection ◽  
Model Description ◽  
Injection Molding Process ◽  
Polymer Mixtures ◽  
Molding Process ◽  
Viscosity Models ◽  
Empirical Coefficients

The rheological behavior of the powder-polymer composition prepared for the application in the powder injection molding (PIM) technology has been studied. A review of models used to describe the rheological behavior of powder slips is presented. A viscosity study of MIM-4140 feedstock with a wax-polyolefin binder was carried out on a capillary rheometer with different capillary diameters. Empirical coefficients of viscosity models were determined. Verification of calculated viscosity values and experimental data for the studied feedstock is presented.

Ti-6Al-4V alloy bimodal powders for powder injection molding

2020 ◽  
Author(s):  
Elena Glazkova ◽  
Nikolay Rodkevich ◽  
Nikita Toropkov ◽  
Aleksandr Pervikov ◽  
Marat Lerner
Keyword(s):  
Injection Molding ◽  
Powder Injection Molding ◽  
Powder Injection
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