Effects of Binders System on Sintered Properties of Metal Injection Molding Parts of M2 High Speed Steel

2014 ◽  
Vol 1024 ◽  
pp. 201-204 ◽  
Author(s):  
Rosliza Sauti ◽  
Nor‘aini Wahab ◽  
Mohd Afian Omar ◽  
I.N. Ahmad
Keyword(s):  
Injection Molding ◽  
High Speed ◽  
High Speed Steel ◽  
Palm Stearin ◽  
Steel Powder ◽  
Paraffin Wax ◽  
Metal Injection Molding ◽  
Waste Rubber ◽  
Vacuum Atmosphere ◽  
M2 High Speed Steel

This paper reports on the compatibility of waste rubber binder combined with conventional binder, paraffin wax and local binder, palm stearin for M2 High Speed Steel injection molding in order to obtain the better properties. The feedstock was prepared at a powder loading of 65 vol.% using 22um M2 High Speed Steel powder and the binders consisting of 55wt.% paraffin wax/palm stearin, 21wt.% polyethylene, 14wt.% waste rubber and 10wt.% stearic acid. The specimens were then sintered in vacuum atmosphere within a temperature range from 1200°C to 1260°C. The results shown even the best properties is obtain from the conventional binders, paraffin wax, thus the properties of local binders palm stearin is still comparable and good. The maximum density of paraffin wax binder was 8.095g/cm3 achieved at temperature 1250°C and palm stearin binder was 8.111g/cm3 achieved at temperature 1240°C. Therefore, in term the best strength of paraffin wax was 2351Mpa whilst palm stearin was 2210MPa, both recorded at temperature 1230°C.

The Influence of Sintering Atmosphere for Metal Injection Moulding M2 High Speed Steel

2014 ◽  
Vol 879 ◽  
pp. 169-174
Author(s):  
R. Sauti ◽  
N.A. Wahab ◽  
M.A. Omar ◽  
I.N. Ahmad
Keyword(s):  
Mechanical Properties ◽  
Injection Moulding ◽  
High Speed ◽  
High Speed Steel ◽  
Steel Powder ◽  
Sintering Atmosphere ◽  
Temperature Range ◽  
Waste Rubber ◽  
Vacuum Atmosphere ◽  
M2 High Speed Steel

This paper reports on the compatibility of waste rubber as binder for M2 High Speed Steel injection moulding. The feedstock was prepared at a powder loading of 65 vol.% using 22μm M2 High Speed Steel powder and the binders consisting of 55wt.% paraffin wax, 21wt.% polyethylene, 14wt.% waste rubber and 10wt.% stearic acid. The specimens were then sintered in vacuum and 95%N2/5%H2 atmosphere. The sintering in vacuum atmosphere occurred within a temperature range from1200°C to 1260°C, whilst the 95%N2/5%H2 atmosphere was carried out within a temperature range from 1220°C to 1300°C. The effects of the sintering atmosphere and temperature on the physical properties, mechanical properties and microstructure were investigated.

Rapid Debinding of Injection Moulded M2 High Speed Steel Using Palm Stearin/Waste Rubber Binder

2014 ◽  
Vol 879 ◽  
pp. 112-118 ◽  
Author(s):  
Noraini Abd Wahab ◽  
Mohd Afian Omar ◽  
Rosliza Sauti ◽  
Nor Amalina Nordin ◽  
Ismail Nasiruddin Ahmad
Keyword(s):  
Stearic Acid ◽  
Injection Moulding ◽  
High Speed ◽  
High Speed Steel ◽  
Palm Stearin ◽  
Complete Removal ◽  
Binder System ◽  
Waste Rubber ◽  
Vacuum Atmosphere ◽  
Debinding Process

Tendency of injection moulded parts to necessitate a long debinding time which consequently leads to an increase of defects formation has been a major obstacle for the economic process of Metal Injection Moulding (MIM). In the present study, a novel binder system based on waste rubber has been formulated in injection moulding of Molybdenum High Speed Steel (M2 HSS). The feedstock consisted of M2 HSS powder with mean diameter particle size of 16μm and binder which comprised of palm stearin, polyethylene, waste rubber and stearic acid. The moulded part was immersed into n-heptane at 60°C in order to remove the palm stearin and stearic acid, followed by sintering in a controlled vacuum atmosphere. Results showed that solvent extraction debinding technique allowed complete removal of palm stearin and stearic acid from the injection moulded part within 3 hours without swelling or distortion of the debound part. In addition, this study has demonstrated that, the novel binder system has successfully shorten the debinding time through a single stage debinding process whilst the sintered part possessed approximate density of 8.1 g/cm3 and hardness of 76.9 HRC.

Influence of Waste Rubber on the Properties and Microstructure of Injection Moulded M2 High Speed Steel

2013 ◽  
Vol 845 ◽  
pp. 939-944
Author(s):  
Noraini Abd Wahab ◽  
Mohd Afian Omar ◽  
Nor Amalina Nordin ◽  
Rosliza Sauti ◽  
M.D. Kamal Bahrin
Keyword(s):  
Stearic Acid ◽  
Injection Moulding ◽  
High Speed ◽  
Multicomponent System ◽  
High Speed Steel ◽  
Paraffin Wax ◽  
Vacuum Sintering ◽  
Waste Rubber ◽  
Homogenous Distribution ◽  
M2 High Speed Steel

New feedstock formulation for metal injection moulding (MIM) of Molybdenum High Speed Steel (M2 HSS) has been developed. The binder is a multicomponent system consisting of major binder paraffin wax (PW), stearic acid (SA) and minor binder polyethelene waste rubber (PEWR). Injection moulding was conducted successfully using a powder loading of 0.65. Scanning electron micrograph of the green injection moulded part revealed homogenous distribution of the M2 HSS particles in the wax matrix. Paraffin wax and stearic acid were driven off by immersing the injection moulded part into n-heptane for five hours. Vacuum sintering of the brown parts at a temperature range of 1240°C-1280°C resulted in high quality M2 HSS parts. The properties of the sintered part such as physical, mechanical and microstructure were studied and discussed to evaluate the influence of waste rubber in MIM of M2 HSS.

scholarly journals Study on Stability of a Novel Binder System Based on Palm Stearin in Metal Injection Moulding Application

2007 ◽  
Vol 4 (2) ◽  
pp. 1
Author(s):  
Muhammad Hussain Ismail ◽  
Norhamidi Muhamad ◽  
Aidah Jumahat ◽  
Istikamah Subuki ◽  
Mohd Afian Omar
Keyword(s):  
Injection Molding ◽  
Flow Characteristics ◽  
Injection Pressure ◽  
Palm Stearin ◽  
Steel Powder ◽  
Metal Injection Molding ◽  
Injection Molding Process ◽  
Binder System ◽  
Molding Process ◽  
Flow Activation Energy

Metal Injection Molding (MIM) is a wellestablished technology for manufacturing a variety of complex and small precision parts. In this paper, fundamental rheological characteristics of MIM feedstock using palm stearin are theoretically analyzed and presented. The feedstock consisted of gas atomized 316L stainless steel powder at three different particle size distributions and the binder system of palm stearin (PS) and polyethylene (PE). The powder loading used was 60vol % for all samples (monosize 16 µm, monosize 45 µm, and bimodal 16 µm + 45 µm) and the binder system of 40vol %(PS/PE = 40/60). The viscosity of MIM feedstock at different temperatures and shear rates was measured and evaluated. Results showed that, the feedstock containing palm stearin exhibited suitable rheological properties by increasing the fluidity of feedstock in MIM process. The rheological results also showed a pseudoplastic flow characteristics, which poses higher value of shear sensitivity (n) and lower value of flow activation energy (E), that are both favourable for injection molding process. The green parts were successfully injected and exhibited adequate strength for handling by optimizing the injection pressure and temperature.

Thermal Treatment of M2 High-Speed Steel Powder for Rapid Tooling Applications

2003 ◽  
Vol 437-438 ◽  
pp. 137-140
Author(s):  
Q.J. Hu ◽  
C.M. Choy ◽  
Z.D. Chen ◽  
Jerry Y.H. Fuh ◽  
Yoke San Wong ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
High Speed ◽  
High Speed Steel ◽  
Steel Powder ◽  
Rapid Tooling ◽  
M2 High Speed Steel

Direct Vacuum Sintering Behaviour of M2 High Speed Steel Powder with Copper and Graphite Additions

1994 ◽  
Vol 37 (3) ◽  
pp. 206-211 ◽  
Author(s):  
E. Dudrová ◽  
M. Kabáatová ◽  
F. Molnár ◽  
R. Bureš
Keyword(s):  
High Speed ◽  
High Speed Steel ◽  
Steel Powder ◽  
Vacuum Sintering ◽  
M2 High Speed Steel ◽  
Sintering Behaviour
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