Rheological Properties of Feedstock Composed of Titanium Alloy Powder and Polyethylene Glycol Based Binder System for Metal Injection Moulding

2013 ◽  
pp. 2363-2373
Author(s):  
G. Thavanayagam ◽  
D. L. Zhang ◽  
K. L. Pickering ◽  
P. Cao
Keyword(s):  
Titanium Alloy ◽  
Polyethylene Glycol ◽  
Rheological Properties ◽  
Injection Moulding ◽  
Alloy Powder ◽  
Binder System ◽  
Metal Injection Moulding

Metal Injection Moulding of Hip Stem CoCrMo Alloy Powder Using Palm Stearin Binder System

2016 ◽  
Vol 1133 ◽  
pp. 334-338
Author(s):  
Mohd Afian Omar ◽  
Noorsyakirah Abdullah ◽  
Rosliza Sauti ◽  
Nurazilah Mohd Zainon ◽  
Nurhaslina Johari ◽  
...  
Keyword(s):  
Stearic Acid ◽  
Injection Moulding ◽  
Alloy Powder ◽  
Palm Stearin ◽  
Complete Removal ◽  
Paraffin Wax ◽  
Binder System ◽  
Time Duration ◽  
Cocrmo Alloy ◽  
Metal Injection Moulding

Metal Injection Moulding (MIM) has undergone development of various binder systems with the aims of shortening the overall debinding time duration. In the present work, binder system based on biopolymer has been utilised in injection moulding of hip stem CoCrMo alloy powder. The feedstock consisted of CoCrMo powder with mean diameter particle size of 16μm and binder system which comprised of major fraction of wax and minor fraction of polyethylene. The moulded part was immersed into n-heptane at 60°C in order to remove the paraffin wax and stearic acid, followed by sintering in a controlled vacuum atmosphere. Results showed that solvent extraction debinding technique allowed complete removal of paraffin wax and stearic acid from the injection moulded part within 5 hours without swelling or distortion of the debound part. Lower heating rate needed during thermal pyrolysis in order to retain the shape due to the thickness of the part.Keywords: CoCrMo, MIM, wax, debinding,

Metal Injection Moulding of ZK60 Magnesium Alloy Powder Using Palm Stearin Based Binder System

2012 ◽  
Vol 445 ◽  
pp. 374-379 ◽  
Author(s):  
Mohd Ruzi Harun ◽  
N. Muhamad ◽  
Abu Bakar Sulong ◽  
N.H. Mohamad Nor ◽  
K.R. Jamaludin
Keyword(s):  
Magnesium Alloy ◽  
Injection Moulding ◽  
Alloy Powder ◽  
Physical And Mechanical Properties ◽  
Palm Stearin ◽  
Binder System ◽  
Metal Injection Moulding ◽  
Moulding Machine ◽  
Temperature And Pressure ◽  
Zk60 Magnesium Alloy

This paper presents a new fabrication process for producing magnesium alloy components via metal injection moulding (MIM). Here, four kind of feedstock with 62, 64, 66 and 68% powder loading were prepared by a mixture of gas atomized ZK60 magnesium alloy powder with a resin consisting of palm stearin and low density polyethylene. The rheological investigation of the feedstock was carried out and the optimal powder loading was determined. The optimal powder loading feedstock was then injected by screw type injection moulding machine. The effects of injection moulding parameters on the physical and mechanical properties of green compacts were evaluated. The results showed that injection moulding of a feedstock containing 64% magnesium alloy was possible at high barrel temperature and pressure.

Metal Injection Moulding of ZK60 Magnesium Alloy Powder Using Palm Stearin Based Binder System

2012 ◽  
Vol 445 ◽  
pp. 374-379 ◽  
Author(s):  
Mohd Ruzi Harun ◽  
N. Muhamad ◽  
Abu Bakar Sulong ◽  
N.H. Mohamad Nor ◽  
K.R. Jamaludin
Keyword(s):  
Magnesium Alloy ◽  
Injection Moulding ◽  
Alloy Powder ◽  
Palm Stearin ◽  
Binder System ◽  
Metal Injection Moulding ◽  
Zk60 Magnesium Alloy

Study of a Binder System for Ti-MIM: A Potential Low Temperature Backbone Polymer

2018 ◽  
Vol 770 ◽  
pp. 206-213 ◽  
Author(s):  
Hong Zhou Zhang ◽  
Muhammad Dilawer Hayat ◽  
Xuan Hui Qu ◽  
Pratik Prakash Jadhav ◽  
Xin Gang Wang ◽  
...  
Keyword(s):  
Polyethylene Glycol ◽  
Low Temperature ◽  
Stearic Acid ◽  
Rheological Properties ◽  
Injection Moulding ◽  
Polyvinyl Acetate ◽  
Water Soluble ◽  
Titanium Metal ◽  
Binder System ◽  
Impurity Control

Impurity control remains to be a challenge to titanium metal injection moulding (Ti-MIM). Much attention has been paid to polyethylene glycol (PEG) based binder systems due to the eco-friendly and water-soluble feature of PEG. In this study, a new easy-to-debind PEG/polypropylene carbonate (PPC)-based binder system (76% PEG+17% PPC+3% polymethyl methacrylate (PMMA)+2% stearic acid (SA)+2% polyvinyl acetate (PVAc)) was developed. The rheological properties of the feedstocks prepared with the binder system in different proportions were assessed. Debinding behaviours of the moulded samples and impurity contents of oxygen (O), carbon (C), and nitrogen (N) of the thermal debound specimens were investigated as well.

Rheological Characterizations of Copper - Palm Stearin Based Binder System for Metal Injection Moulding

2016 ◽  
Vol 867 ◽  
pp. 77-80
Author(s):  
Nor Amalina Nordin ◽  
Mohammad Dahar Kamal Bahrin ◽  
Nor‘aini Wahab ◽  
Afian Omar ◽  
Muhammad Hussain Ismail
Keyword(s):  
Electron Microscope ◽  
Injection Moulding ◽  
Palm Stearin ◽  
Mixing Process ◽  
Capillary Rheometer ◽  
Binder System ◽  
Microstructural Study ◽  
Metal Injection Moulding ◽  
Scanning Electron ◽  
Good Agreement

This research paper reports the findings of feedstock establishment works for Metal Injection Moulding (MIM) of copper parts employing palm stearin based binder system. The main objective of this study is to explore an appropriate formulation of palm stearin-polyethylene (PSPE) binder system of copper feedstock that enabling the MIM process. Two formulations; 60%wt PS and 70%wt PS with constant powder loading of 60 vol. % Cu has been prepared. The mixing process of copper powder and binders was performed at the speed of 50 rpm at 160°C. Scanning Electron Microscope (SEM) has been used for the microstructural study of starting materials and mixtures. The rheological characterizarions for both formulations that were carried out using Rosand RH2000 Capillary Rheometer exhibited the pseudo plastic flow and in good agreement with previous findings.

Injection Moulding of A Bimodal Size Distribution 316L Stainless Steel Powders

2012 ◽  
Author(s):  
M.A. Omar
Keyword(s):  
Stainless Steel ◽  
Polyethylene Glycol ◽  
Polymethyl Methacrylate ◽  
Injection Moulding ◽  
Raw Materials ◽  
Fine Powder ◽  
Steel Powder ◽  
Water Leaching ◽  
Coarse Powder ◽  
Metal Injection Moulding

Bagi mengurangkan kos bahan mentah untuk proses pangacuan suntikan logam (MIM), bahan teracu yang diperbuat daripada serbuk logam keluli tahan karat dengan nisbah serbuk logam kasar dan halus yang berlainan telah diselidiki. Bahan suapan tersebut disediakan dengan menggunakan sistem bahan pengikat komposit yang terdiri sebahagian besarnya polietilina glikol (PEG) yang berlainan berat molekulnya dan emulsi polimetil metakrilat (PMMA) yang seterusnya disuntik ke dalam bentuk segiempat tepat dengan suhu muncung suntikan logam pada 140°C. Hasil ujikaji menunjukkan kekuatan bahan teracu meningkat secara linear dengan peningkatan nisbah serbuk halus di dalam campuran dan optimum pada 30 wt.% dan seterusnya berlaku penurunan dengan peningkatan nisbah serbuk halus. Peningkatan serbuk logam halus di dalam campuran juga dapat meningkatkan ketumpatan akhir dan kekerasan bahan tersinter. Kadar penyingkiran polietilina glikol semasa proses pengurasan air meningkat dengan penurunan nisbah serbuk logam halus yang mana menunjukkan bahawa serbuk logam kasar memberi kesan ketara ke atas proses penyingkiran bahan pengikat. Kata kunci: pengacuan suntikan logam; polietilina glikol; polimetil metakrilat; pengurusan air; pengsinteran In an effort to lower the cost of raw materials of metal injection moulding (MIM), a moulded part made of a different ratio of coarse and fine stainless steel powder mixtures, ranging from 10 to 50 wt.% of fine powder were investigated. The feedstocks were prepared using a composite binder system which consist of a major fraction of polyethylene glycol (PEG) with different molecular weight and a minor fraction of polymethyl methacrylate (PMMA) emulsion and subsequently moulded into a rectangular shape at the nozzle temperature of 140°C. The results show that the green strength of the moulded part increased linearly with the increased of the ratio of fine powder to an optimum of 30 wt.% and decreased slightly with the increased of coarse/fine ratio. An increase in the fine powder in the mixture, improved the final densification and hardness of the sintered parts. The rate of PEGs removed during water leaching substantially increased with the lower ratio of fine powder, which suggest that the coarse powder has significant influence on the removal of the binder. Key words: metal injection moulding; polyethylene glycol; polymethyl methacrylate; water leaching; sintering

A Study of Polyvinyl Butyryl Based Binder System in Titanium Based Metal Injection Moulding

2012 ◽  
Vol 520 ◽  
pp. 167-173 ◽  
Author(s):  
G. Thavanayagam ◽  
De Liang Zhang ◽  
K.L. Pickering ◽  
Stella Raynova
Keyword(s):  
Thermal Analysis ◽  
Injection Moulding ◽  
Twin Screw Extruder ◽  
Metal Powders ◽  
Binder System ◽  
Mixing Conditions ◽  
Screw Extruder ◽  
Metal Injection Moulding ◽  
Twin Screw ◽  
Mechanical Mixer

Metal injection moulding (MIM) is an innovative injection moulding technique widely used to produce complex shaped components from feedstock composed of metal powders and thermosetting or thermoplastic binders. In MIM, binder selection and formulation are considered as critical processes since binder characteristics dictate the success of MIM. The purpose of this study is to determine the feasibility of polyvinyl butyryl (PVB) based binder system in Ti-6Al-4V(wt.%)/binder feedstock, as well as to understand the effects of key parameters, such as powder loading and mixing conditions on the rheological properties of a feedstock. In this study, PVB, polyethylene glycol (PEG), and stearic acid (SA) were chosen to formulate a multi-component binder system to prepare Ti-6Al-4V based feedstock with the aid of three types of mixers: a compounder, a modified mechanical mixer and a twin screw extruder. Further, morphological analysis was performed using optical microscopy and scanning electron microscopy. Thermal analysis was performed using simultaneous differential thermal analysis and thermogravimetric analysis. Results showed that binder formulation was reasonably successful with the aid of both mechanical mixer and a twin screw extruder under certain mixing conditions, and the critical powder loading was 68 vol.%, resulting in an optimum powder loading of 63 vol.% .

scholarly journals Application of thermal analysis in the selection of polymer components used as a binder for metal injection moulding of Co–Cr–Mo alloy powder

2018 ◽  
Vol 134 (1) ◽  
pp. 391-399 ◽  
Author(s):  
Grzegorz Matula ◽  
Błażej Tomiczek ◽  
Mariusz Król ◽  
Aleksandra Szatkowska ◽  
Maria Eugenia Sotomayor
Keyword(s):  
Thermal Analysis ◽  
Injection Moulding ◽  
Alloy Powder ◽  
Metal Injection Moulding ◽  
Selection Of

scholarly journals Metal Injection Moulding of Titanium

2011 ◽  
Vol 690 ◽  
pp. 181-184 ◽  
Author(s):  
Thomas Ebel
Keyword(s):  
Mechanical Properties ◽  
Injection Moulding ◽  
Alloy Powder ◽  
Fatigue Properties ◽  
Sintered Part ◽  
Metal Injection Moulding

A route to handle titanium specific challenges as oxygen and carbon sensitivity when applying Metal Injection Moulding is presented. It is shown that by appropriate processing components with excellent mechanical properties can be manufactured from Ti-6Al-4V alloy powder. In addition, alloy modification by simple powder metallurgical methods is performed in order to optimise the fatigue properties by changing the microstructure of the sintered part.

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