Aspects Concerning Rheological Properties of the CIM’s Binder Systems

2007 ◽  
Vol 23 ◽  
pp. 107-110
Author(s):  
Lidia Matrici ◽  
Şerban Domşa ◽  
Liviu Brânduşan
Keyword(s):  
Shear Stress ◽  
Injection Molding ◽  
Binder Content ◽  
Ceramic Injection Molding ◽  
Design Engineers ◽  
Low Viscosity ◽  
Injection Temperature ◽  
Production Problems ◽  
Plastic Injection ◽  
Independent Parameters

Ceramic Injection Molding (CIM) can provide design engineers with economic solution to otherwise apparently insoluble part production problems. CIM combine attributes of plastic injection molding with the higher properties of ceramics. The aim of the paper is examine the rheology of binder systems with independent parameters (shear rate, temperature, and binder content). The study also establish that the feedstocks used for CIM it must be assured an extremely low viscosity at the injection temperature. The experimental results show that an increasing of the wax contain with 5% leads to a more pronounced decrease of the shear stress than the increasing with 10 oC of the temperature. In all situations the temperature’s increasing determines a decrease of the feedstock’s viscosity and shear stress.

Effects of Injection Temperature and Pressure on Green Part Density for Ceramic Injection Molding

2012 ◽  
Vol 622-623 ◽  
pp. 429-432
Author(s):  
Sarizal Md Ani ◽  
Andanastuti Muchtar ◽  
Norhamidi Muhamad ◽  
Jaharah A. Ghani
Keyword(s):  
Injection Molding ◽  
Injection Pressure ◽  
High Density ◽  
Ceramic Injection Molding ◽  
Optimum Parameters ◽  
Green Part ◽  
Injection Temperature ◽  
Temperature And Pressure ◽  
Part Density ◽  
Zirconia Powders

This study investigates the effects of injection temperature and pressure on green part density. The high density of the green parts for the ceramic injection molding (CIM) process improves the material properties of the final product. In this study, the feedstock used was a combination of alumina and zirconia powders with a binder consisting of high density polyethylene, paraffin wax, and stearic acid. Powder loading was fixed at 57% volume. A standard screw-type injection molding machine was used to produce the green parts. The density of the green parts was measured using the Archimedes method. Experimental results show that a 160 °C injection temperature and a 110 MPainjection pressure were the optimum parameters to achieve high density of the green parts. In addition, defect-free green parts were obtained.

Rheological Properties of Zirconia Toughened Alumina Powder for Ceramic Injection Molding

2012 ◽  
Vol 626 ◽  
pp. 294-297
Author(s):  
Sarizal Md Ani ◽  
Andanastuti Muchtar ◽  
Norhamidi Muhamad ◽  
Jaharah A. Ghani
Keyword(s):  
Injection Molding ◽  
Rheological Properties ◽  
Energy Flow ◽  
Alumina Powder ◽  
Critical Element ◽  
Ceramic Injection Molding ◽  
Low Viscosity ◽  
Properties Of Materials ◽  
Power Law Index ◽  
Zirconia Toughened Alumina

The rheological properties of feedstock are critical element to the success of the ceramic injection molding (CIM) process. The suitability of the developed feedstock can be reducing the problems that may arise during injection molding, debinding, and sintering. This study identifies suitable powder loading based on the rheological properties of materials by using a capillary rheometer machine. The feedstock used is a combination of zirconia toughened alumina powder with a binder that consists of high density polyethylene, paraffin wax, and stearic acid. Experimental results showed that all of the feedstocks are suitable for injection molding because of their pseudoplastic nature and low viscosity. However, the low power law index and low activation energy flow of the 57 vol.% powder loading make it most suitable for the CIM process.

scholarly journals Energy and Eco-Impact Evaluation of Fused Deposition Modeling and Injection Molding of Polylactic Acid

2021 ◽  
Vol 13 (4) ◽  
pp. 1875
Author(s):  
Emmanuel Ugo Enemuoh ◽  
Venkata Gireesh Menta ◽  
Abdulaziz Abutunis ◽  
Sean O’Brien ◽  
Labiba Imtiaz Kaya ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Injection Molding ◽  
Polylactic Acid ◽  
Fused Deposition Modeling ◽  
Plastic Injection Molding ◽  
Measurement Models ◽  
Fused Deposition ◽  
Dog Bone ◽  
Deposition Modeling ◽  
Plastic Injection

There is limited knowledge about energy and carbon emission performance comparison between additive fused deposition modeling (FDM) and consolidation plastic injection molding (PIM) forming techniques, despite their recent high industrial applications such as tools and fixtures. In this study, developed empirical models focus on the production phase of the polylactic acid (PLA) thermoplastic polyester life cycle while using FDM and PIM processes to produce American Society for Testing and Materials (ASTM) D638 Type IV dog bone samples to compare their energy consumption and eco-impact. It was established that energy consumption by the FDM layer creation phase dominated the filament extrusion and PLA pellet production phases, with, overwhelmingly, 99% of the total energy consumption in the three production phases combined. During FDM PLA production, about 95.5% of energy consumption was seen during actual FDM part building. This means that the FDM process parameters such as infill percentage, layer thickness, and printing speed can be optimized to significantly improve the energy consumption of the FDM process. Furthermore, plastic injection molding consumed about 38.2% less energy and produced less carbon emissions per one kilogram of PLA formed parts compared to the FDM process. The developed functional unit measurement models can be employed in setting sustainable manufacturing goals for PLA production.

Influence of Carbon Content on Ceramic Injection Molding of Reaction-Bonded Silicon Carbide

2016 ◽  
Vol 13 (5) ◽  
pp. 838-843 ◽  
Author(s):  
Zhao Zhang ◽  
Yujun Zhang ◽  
Hongyu Gong ◽  
Xue Guo ◽  
Yubai Zhang ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Injection Molding ◽  
Carbon Content ◽  
Ceramic Injection Molding
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