Morphology and Mechanical Properties of MIM Feedstock Using TPNR Backbone Binder

2015 ◽  
Vol 1115 ◽  
pp. 279-282
Author(s):  
Hassan Norita ◽  
Sahrim Ahmad ◽  
N. Muhamad ◽  
Mohd Afian Omar ◽  
Noor Azlina Hassan
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Injection Moulding ◽  
316L Stainless Steel ◽  
Palm Stearin ◽  
Tensile Behaviour ◽  
Moulding Process ◽  
Injection Moulding Process ◽  
Green Sample ◽  
Morphology And Mechanical Properties

This study has examined the effects of using TPNR backbone polymer on the morphology and mechanical properties of the metal injection moulding feedstock 316L stainless steel with paraffin wax (PW) and palm stearin (PS) respectively as the main binder and stearic acid as a lubricant during mixing and injection moulding process. Tensile behaviour indicates that the green sample of feedstock PW/TPNR/SA system gives higher value compared to PS/TPNR/SA system. Morphology studies showed that green samples of PS/TPNR/SA exhibited brittleness fracture compared to PW/TPNR/SA system.

Rheological Investigation of ZK60 Magnesium Alloy Feedstock for Metal Injection Moulding Using Palm Stearin Based Binder System

2010 ◽  
Vol 44-47 ◽  
pp. 4126-4130 ◽  
Author(s):  
Mohd Ruzi Harun ◽  
N. Muhamad ◽  
Abu Bakar Sulong ◽  
Nor Hafiez Mohamad Nor ◽  
Mohd Halim Irwan Ibrahim
Keyword(s):  
Injection Moulding ◽  
Flow Behavior ◽  
Palm Stearin ◽  
Mg Alloy ◽  
Flow Behavior Index ◽  
Volume Percentage ◽  
Flow Activation Energy ◽  
Moulding Process ◽  
Metal Injection Moulding ◽  
Injection Moulding Process

This paper investigates the characteristic important to metal injection moulding (MIM) process via rheological behavior of MIM feedstock. A gas atomized spherical ZK60 magnesium (Mg) alloy powder and the binder of 60wt.% palm stearin (PS) + 40wt.% low density polyethylene (LDPE) were used in this investigation. Prior to mixing process, critical powder volume percentage (CPVP) was determined and subsequently four different feedstocks with powder loading of 62, 64, 66 and 68vol.% were prepared. The properties of the feedstocks were then analyzed rheologically. Here, the flow behavior index n, the flow activation energy E and the mold ability index αSTV of the Mg alloy MIM feedstocks were determined. Results show that feedstock with 64% powder loading has the best rheological properties and therefore it is considered to be the best for the injection moulding process.

Influence of Injection Moulding Process Parameters on High-Density Polyethylene Surface Hardness

2020 ◽  
Vol 994 ◽  
pp. 189-196
Author(s):  
Aleš Mizera ◽  
Tomáš Fiala ◽  
Miroslav Manas ◽  
Pavel Stoklásek ◽  
Martin Ovsik
Keyword(s):  
Mechanical Properties ◽  
Process Parameters ◽  
Injection Moulding ◽  
High Density Polyethylene ◽  
Surface Hardness ◽  
High Density ◽  
Mould Temperature ◽  
Depth Sensing ◽  
Moulding Process ◽  
Injection Moulding Process

Commodity polymers are a common part of everyday life. They consist mainly of polyolefins such as polyethylene, polypropylene. They are primarily used for ease of processing, cost and especially chemical resistance. The disadvantages of these polymers are low mechanical properties as well as temperature resistance. Any improvement in the mechanical properties can extend the application possibilities of the commodity polymers to the areas reserved for the construction polymers. This paper deals with changing two injection moulding process parameters - melt and mould temperature to high-density polyethylene (HDPE) surface hardness. HDPE hardness was measured using the method of Depth-Sensing Indentation (DSI) on three different instruments (ultranano-, nanoand micro-hardness tester). It has been found that as the melt and mould temperature increases, the hardness slightly increases.

scholarly journals A Review on Microcellular Injection Moulding

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4209
Author(s):  
Yifei Ding ◽  
Mohammed H. Hassan ◽  
Otto Bakker ◽  
Srichand Hinduja ◽  
Paulo Bártolo
Keyword(s):  
Mechanical Properties ◽  
Injection Moulding ◽  
Polymer Processing ◽  
Bubble Nucleation ◽  
Future Research ◽  
Light Weight ◽  
Environmental Pressures ◽  
Moulding Process ◽  
Research Perspectives ◽  
Injection Moulding Process

Microcellular injection moulding (MuCell®) is a polymer processing technology that uses a supercritical fluid inert gas, CO2 or N2, to produce light-weight products. Due to environmental pressures and the requirement of light-weight parts with good mechanical properties, this technology recently gained significant attention. However, poor surface appearance and limited mechanical properties still prevent the wide applications of this technique. This paper reviews the microcellular injection moulding process, main characteristics of the process, bubble nucleation and growth, and major recent developments in the field. Strategies to improve both the surface quality and mechanical properties are discussed in detail as well as the relationships between processing parameters, morphology, and surface and mechanical properties. Modelling approaches to simulate microcellular injection moulding and the mathematical models behind Moldex 3D and Moldflow, the two most commonly used software tools by industry and academia, are reviewed, and the main limitations are highlighted. Finally, future research perspectives to further develop this technology are also discussed.

scholarly journals Optimisation de la chaîne complète du procédé de moulage par injection métallique

2008 ◽  
pp. 397-422
Author(s):  
Ghassane Ayad ◽  
Thierry Barriere ◽  
Jean-Claude Gelin
Keyword(s):  
Mechanical Properties ◽  
Solid State ◽  
Injection Moulding ◽  
Parametric Identification ◽  
Material Model ◽  
Physical Parameters ◽  
Solid State Diffusion ◽  
Moulding Process ◽  
State Diffusion ◽  
Injection Moulding Process

This paper is related to the parametric identification and optimization of the injection moulding and sintering stage of the Metal Injection Moulding process. The injection stage is described using a biphasic flow formulation, whereas the sintering mechanism by solid state diffusion is accounted through a viscoplastic type material model. The accuracy of the numerical results of the injection moulding or sintering stages is strongly dependent on the identification of physical parameters entering in the models. In this paper one propose to combine the optimization of the injection moulding stage with the parametric identification of the sintering stage in order to determine the size of the mould cavities in order to get components without defects and with the appropriate resulting geometrical sizes and mechanical properties.

scholarly journals Using taguchi approach for investigating mechanical properties of recycled carbon fibre reinforced thermoplastics for injection moulding applications

2021 ◽  
Vol 13 (2) ◽  
pp. 149-154
Author(s):  
Syairah Zainudin ◽  
◽  
Norshah Aizat Shuaib ◽  
Nur’ain Wahidah Ya Omar ◽  
Azwan Iskandar Azmi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Fibre ◽  
Injection Moulding ◽  
Orthogonal Design ◽  
High Volume ◽  
Processing Parameters ◽  
Moulding Process ◽  
Injection Moulding Process ◽  
Reinforced Thermoplastics ◽  
Taguchi Orthogonal Design

Demand for carbon fibre reinforced plastic (CFRP) increases due to its popular demand in sectors such as automotive and aerospace. This leads to high volume of manufacturing and end of life CFRP waste. The challenge is to recycle the heterogenous waste and utilise the recycled carbon fibre (rCF) in potential applications, including the injection moulding process. However, the effect of processing parameters such as type of new thermoplastics, filler weight loading and particle size on product mechanical properties is not well understood. This study carried out experimental trials based on L4 Taguchi orthogonal design. It is found that the mechanical and physical properties significantly depend on the selected parameters. Optimisation of the parameters should depend on final application of the product. This study highlights potential use of rCF in reinforcing pure thermoplastics, as well as an alternative material to virgin carbon fibre (CF).

Feedstock Characterization of Elemental Nickel and Titanium Powders Mixture for Metal Injection Moulding Process

2014 ◽  
Vol 575 ◽  
pp. 78-82 ◽  
Author(s):  
Rosliza Razali ◽  
Zulaila Abdullah ◽  
Istikamah Subuki ◽  
Muhammad Hussain Ismail ◽  
Norhamidi Muhamad
Keyword(s):  
Injection Moulding ◽  
Palm Stearin ◽  
Scanning Calorimetry ◽  
Moulding Process ◽  
Metal Injection Moulding ◽  
Injection Moulding Process ◽  
Initial Characterization ◽  
Titanium Powders ◽  
Internal Mixer

The success of metal injection moulding (MIM) process is significantly influenced by the homogeneity level of the powder-binder mixture (feedstock). This paper highlights some initial characterization of the feedstock containing elemental Ni and Ti powders mixture, (50.8 at.% Ni/ 49.2 at.% Ti) mixed with Palm stearin-based binder system. The feedstock was prepared using an internal mixer, HAAKE Rheomix at a temperature of 160°C for 2 hours. The feedstock was then characterized by Differential Scanning Calorimetry (DSC), Thermogravimetric (TGA), Scanning Electron Microscopy (SEM) and Capillary Rheometer. All the results obtained were analyzed and discussed for further injection moulding process.

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