scholarly journals Presintered Titanium-Hydroxyapatite Composite Fabricated via PIM Route

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 318
Author(s):  
Nurul Nadiah Mahmud ◽  
Abu Bakar Sulong ◽  
Bhupendra Sharma ◽  
Kei Ameyama
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Palm Stearin ◽  
Powder Injection ◽  
Binder System ◽  
Volume Percentage ◽  
Low Viscosity ◽  
Hydroxyapatite Composite ◽  
Thermal Debinding ◽  
Debinding Process

Ti6Al4V-HA composites have been recognized for their potential for biomedical implantation purposes. In the present study, Ti6Al4V-HA composites were fabricated by Powder Injection Molding (PIM) route. Ti6Al4V-HA feedstock at a ratio of 87:13 vol.% was prepared by using a binder system consisting of palm stearin (PS) and polyethylene (PE). The Critical Powder Volume Percentage (CPVP) value for Ti6Al4V-HA was 68 vol.%. Ti6Al4V-HA feedstock was developed at 66 vol.% powder loading. Ti6Al4V-HA feedstock showed pseudoplastic behaviour with a low viscosity and low activation energy of flow and was successfully injected into a tensile bar shape. The debinding process involved a solvent and thermal debinding operation. The debonded parts were sintered at 1300 °C, and the influence of the presintering stage on the physical and mechanical properties of the sintered parts was investigated. It was proven that the presintering stage was able to restrain the transformation of Ti6Al4V into Ti3Al (α2) as well as the decomposition of HA. These are key findings ideas for the designing of sintering parameters, where the decomposition of HA becoming the main problem in the sintering of Ti6Al4V-HA composites at a high temperature. The obtained results also showed that the sintered parts had a porous structure, which looked promising for their use in biomedical implantations. purposes.

scholarly journals Effect of sintering parameters on physical and mechanical properties of powder injection moulded stainless steel-hydroxyapatite composite

PLoS ONE ◽  
2018 ◽  
Vol 13 (10) ◽  
pp. e0206247 ◽  
Author(s):  
Mohd Ikram Ramli ◽  
Abu Bakar Sulong ◽  
Norhamidi Muhamad ◽  
Andanastuti Muchtar ◽  
Amir Arifin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Physical And Mechanical Properties ◽  
Powder Injection ◽  
Hydroxyapatite Composite

The Effect of Lithium Alumina Silicate Phases on Elastic Modulus of Porcelain Tiles

2014 ◽  
Vol 92 ◽  
pp. 188-193 ◽  
Author(s):  
Tuna Aydin ◽  
Alpagut Kara
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Liquid Phase ◽  
Bulk Density ◽  
Bending Strength ◽  
Physical And Mechanical Properties ◽  
Raw Material ◽  
Closed Porosity ◽  
Low Viscosity ◽  
Porcelain Tiles

Spodumene, which is a lithium alumina silicate, has been used as a raw material in the production of thermal shock resistant whitewares and sanitarywares. The presence of spodumene results in enhancement of mullitization and imparts better physical and mechanical properties to ceramics. In this study, the influence of Lithium alumina silicate phases on the mechanical properties of standard porcelain stoneware body was investigated. Especially solid-solid reactions were observed between spodumene and quartz or spodumene and clay. These solid-solid reactions bring about a newly formed lithium alumina silicate (LAS) phases. Spodumene allows the development of a low viscosity liquid phase and results in a decrease in closed porosity, also with increase in bulk density, bending strength and elastic modulus.

COMPRESSIVE MECHANICAL PROPERTIES OF POROUS TI-6AL-4V WITH PALM STEARIN BINDER SYSTEM

2015 ◽  
Vol 76 (6) ◽  
Author(s):  
N. H. Mohamad Nor ◽  
J.B Saedon ◽  
N. A. A. Kasim ◽  
M. H. Ismail ◽  
Hazran Husain
Keyword(s):  
Mechanical Properties ◽  
Sodium Chloride ◽  
Volume Fraction ◽  
Young Modulus ◽  
Palm Stearin ◽  
Binder System ◽  
Water Leaching ◽  
Space Holder ◽  
Porous Ti ◽  
Different Temperatures

Most Ti-6Al-4V implant used today are often much stiffer than human bone. However, the young modulus of those Ti-6Al-4V implants can be reduced through the formation of porous structure. Palm stearin binder system with an addition of sodium chloride as space holder has been established in the fabrication of porous Ti-6Al-4V. Thus, this paper focuses on the compressive mechanical properties of porous Ti-6Al-4V with utilization of palm stearin binder system along with sodium chloride (NaCl) as the space holder. The evaluated compositions consist of the powder volume fraction of 63vol% and 65vol%. The samples were compacted by thermal compacting machine at temperature of 160oC. Two different debinding processes involved, which are heptane solvent and water leaching. Then the samples were sintered up to three different temperatures, which are 1200oC, 1250oC and 1300oC. Mechanical properties of the porous Ti-6Al-4V were characterized by axial compression testing. The maximum compressive stress and Young’s modulus of the samples were determined to be 403.87MPa and 9.92GPa.

Micro Powder Injection Moulding Using Nanosized Powders

2014 ◽  
Vol 1024 ◽  
pp. 116-119
Author(s):  
Norhamidi Muhamad ◽  
Javad Rajabi ◽  
Abu Bakar Sulong ◽  
Abdolali Fayyaz ◽  
Muhammad Rafi Raza
Keyword(s):  
Injection Moulding ◽  
Physical And Mechanical Properties ◽  
High Volume ◽  
Full Density ◽  
Powder Injection ◽  
Binder System ◽  
Polymer Mixtures ◽  
Nanosized Powders ◽  
Nano Powder ◽  
Powder Injection Moulding

Micro powder injection moulding (μPIM) is one of the micro-moulding technology applied today in high-volume fabrication of metal and ceramic micro-components. The current study presents the micro powder injection moulding (µPIM) of 316L Stainless Steel nanopowder-polymer mixtures. 316L SS powders have been blended with a binder system which consists of Polyethylene Glycol (PEG), Polymethyl Methacrylate (PMMA) and Stearic Acid (SA). All the feedstock prepared shows homogeneity and pseudo-plastic behaviour which is suitable for μPIM process. The results showed that increase in nano powder content would improve the powder loading, injection and sintering temperature. Moreover, high physical and mechanical properties of the sintered specimen have been achieved under vacuum atmosphere. The above results indicate that application of nano powder has the potential to provide micro powder injection moulded parts with nearly full density, fine microstructure. The binder system is environment-friendly, has low viscosity-temperature and suitable to prepare feedstock for μPIM.

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.

Study of the Debinding Rate on MIM Parts Using Plasma Assisted Debinding

2008 ◽  
Vol 591-593 ◽  
pp. 229-234 ◽  
Author(s):  
W. da Silveira ◽  
Paulo A.P. Wendhausen ◽  
Aloísio Nelmo Klein
Keyword(s):  
Injection Molding ◽  
Mass Loss ◽  
Polymer System ◽  
Powder Injection ◽  
Influence Of Temperature ◽  
Metal Powder Injection Molding ◽  
Thermal Extraction ◽  
Thermal Debinding ◽  
Extraction Processes ◽  
Debinding Process

Binders based on mixtures of polymers and waxes are suitable both for solvent combined with thermal extraction, as well as for pure thermal debinding. The recently developed plasma-assisted debinding and sintering (PADS) process has been targeted, for historical reasons, on a wax-polymer system, appropriated for solvent combined with thermal extraction processes. This paper shows experimental results related to the debinding rate of parts produced by metal powder injection molding using the recently developed Plasma Assisted Debinding process. Influence of temperature and the ratio of cathodic area on the mass loss were studied.

Study on Binder System for Micro Powder Injection Molding of ZrO2 Ceramic

2012 ◽  
Vol 706-709 ◽  
pp. 1948-1954
Author(s):  
Lin Liu ◽  
X.L. Ni ◽  
Hai Qing Yin ◽  
Xuan Hui Qu
Keyword(s):  
Injection Molding ◽  
Large Scale ◽  
Dimensional Accuracy ◽  
Mold Filling ◽  
Powder Injection Molding ◽  
Powder Injection ◽  
Scale Production ◽  
Binder System ◽  
Widespread Application ◽  
Debinding Process

Micro powder injection molding has been accepted as a potential forming technology for large-scale production of miniature components in industries. However, mold filling capability is often poor due to the blind hole structure of the die cavity, which restricts the widespread application of this technique. In this paper, ZrO2 micro gears with addendum circle ranging from 900μm to 200μm were studied. Instead of using traditional PW-HDPE-SA binder as in powder injection molding, thermoplastic binder system is optimized here for better replication of micro gear. It is found that the dimensional accuracy and demold after injection molding can be improved by utilizing proper binder system. ZrO2 feedstock with a powder loading of 46vol.% and the binder system consisting of BW, HDPE and SA was successfully injection molded and demolded, which indicates good mold filling capability and sufficient demolding strength. The binder system was successfully removed by debinding process in two steps, solvent debinding followed by thermal debinding. Debound components free of defects were obtained. Keywords: Micro powder injection molding, ZrO2 feedstock, Binder system, Molding filling capability, Demolding strength

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