Porous NiTi alloy by metal injection moulding/sintering of elemental powders: Effect of sintering temperature

2012 ◽  
Vol 70 ◽  
pp. 142-145 ◽  
Author(s):  
Muhammad Hussain Ismail ◽  
Russell Goodall ◽  
Hywel A. Davies ◽  
Iain Todd
Keyword(s):  
Injection Moulding ◽  
Sintering Temperature ◽  
Niti Alloy ◽  
Porous Niti ◽  
Metal Injection Moulding

Sintering temperature effects on the properties of stainless steel 316L compact fabricated by metal injection moulding

2019 ◽  
Vol 33 (1/2) ◽  
pp. 37 ◽  
Author(s):  
Nur Syawanie Manam ◽  
Wan Sharuzi Wan Harun ◽  
Mohd Halim Irwan Ibrahim ◽  
Nur Zalikha Khalil ◽  
Mahendran Samykano
Keyword(s):  
Stainless Steel ◽  
Injection Moulding ◽  
Temperature Effects ◽  
Sintering Temperature ◽  
Stainless Steel 316L ◽  
Metal Injection Moulding

FEEDSTOCK FLOW CHARACTERIZATION AND PROCESSING OF POROUS NITI BY METAL INJECTION MOULDING (MIM)

2015 ◽  
Vol 76 (11) ◽  
Author(s):  
Muhammad Hussain Ismail ◽  
Nor Hafiez Mohamad Nor ◽  
Hywel A. Davies ◽  
Iain Todd
Keyword(s):  
Liquid Phase ◽  
Injection Moulding ◽  
Transient Liquid Phase ◽  
Liquid Phase Sintering ◽  
Optimum Operating ◽  
Vacuum Furnace ◽  
Major Fraction ◽  
Optimum Operating Condition ◽  
Porous Niti ◽  
Metal Injection Moulding

Porous NiTi alloy with a nearly three-dimensionally interconnected pore structure has been successfully fabricated by a transient liquid phase sintering following the metal injection moulding (MIM) process, using a mixture of Ni and Ti elemental powders. The elemental Ni and Ti powders mixture was mixed with a binder system, comprised mainly polyethylene-glycol (PEG) in an alternative technique using a speed mixer, principally incorporating a dual asymmetric centrifuge (DAC). The powder-binder mixture was then characterized using a capillary rheometer at various temperatures and shear rates. It was found that the feedstock exhibited pseudo-plastic behaviour, which is favourable for the MIM process. A temperature range of 120oC - 130oC was considered as the optimum operating condition for the injection moulding processing. The parts were moulded into cylindrical shapes, leached in warm water (60oC for 10 hours), thermally debound in argon and subsequently sintered in a vacuum furnace at four different temperatures ranging from 950oC to 1250oC.  All samples underwent expansion in both diameter and height after water leaching and sintering.  The XRD results showed that increasing the sintering temperature resulted in a major fraction of the B2 NiTi phase due to phase homogenization and subsequently decreased the amount of secondary phases such as NiTi2 and Ni3Ti. Besides that, the formation of the transient liquid phase during sintering enabled major fraction of pores to be developed with porosity and average size of 39 - 45% and 100 - 120 μm, respectively. The porous parts produced have a great potential to be used as an implant in biomedical applications. 

Sintering temperature effects on the properties of stainless steel 316L compact fabricated by metal injection moulding

2019 ◽  
Vol 33 (1/2) ◽  
pp. 37
Author(s):  
Nur Syawanie Manam ◽  
Wan Sharuzi Wan Harun ◽  
Mohd Halim Irwan Ibrahim ◽  
Nur Zalikha Khalil ◽  
Mahendran Samykano
Keyword(s):  
Stainless Steel ◽  
Injection Moulding ◽  
Temperature Effects ◽  
Sintering Temperature ◽  
Stainless Steel 316L ◽  
Metal Injection Moulding

Using an agar-based binder to produce porous NiTi alloys by metal injection moulding

2013 ◽  
Vol 37 ◽  
pp. 92-99 ◽  
Author(s):  
Gang Chen ◽  
Peng Cao ◽  
Guian Wen ◽  
Neil Edmonds ◽  
Yimin Li
Keyword(s):  
Injection Moulding ◽  
Niti Alloys ◽  
Porous Niti ◽  
Metal Injection Moulding

scholarly journals Porous Titanium Scaffolds Fabricated by Metal Injection Moulding for Biomedical Applications

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1573 ◽  
Author(s):  
Ali Dehghan-Manshadi ◽  
Yunhui Chen ◽  
Zhiming Shi ◽  
Michael Bermingham ◽  
David StJohn ◽  
...  
Keyword(s):  
Yield Stress ◽  
Young’S Modulus ◽  
Injection Moulding ◽  
Sintering Temperature ◽  
Young's Modulus ◽  
Porous Titanium ◽  
Moulding Process ◽  
Metal Injection Moulding ◽  
Injection Moulding Process ◽  
High Level

Biocompatible titanium scaffolds with up to 40% interconnected porosity were manufactured through the metal injection moulding process and the space holder technique. The mechanical properties of the manufactured scaffold showed a high level of compatibility with those of the cortical human bone. Sintering at 1250 °C produced scaffolds with 36% porosity and more than 90% interconnected pores, a compressive yield stress of 220 MPa and a Young’s modulus of 7.80 GPa, all suitable for bone tissue engineering. Increasing the sintering temperature to 1300 °C increased the Young’s modulus to 22.0 GPa due to reduced porosity, while reducing the sintering temperature to 1150 °C lowered the yield stress to 120 MPa, indicative of insufficient sintering. Electrochemical studies revealed that samples sintered at 1150 °C have a higher corrosion rate compared with those at a sintering temperature of 1250 °C. Overall, it was concluded that sintering at 1250 °C yielded the most desirable results.

Porous NiTi alloy prepared from elemental powder sintering

1998 ◽  
Vol 13 (10) ◽  
pp. 2847-2851 ◽  
Author(s):  
Bing-Yun Li ◽  
Li-Jian Rong ◽  
Yi-Yi Li
Keyword(s):  
Sintering Temperature ◽  
Niti Alloy ◽  
Active Agent ◽  
Elemental Powder ◽  
Sintering Process ◽  
Porous Niti ◽  
Sintering Time ◽  
Powder Sintering ◽  
Experimental Parameters ◽  
Selection Of

An elemental powder sintering (EPS) technique has been developed for the synthesis of porous NiTi alloy, in which Ni and Ti powders are used as the reactants and TiH2 powder is added as a pore-forming agent and active agent. Effects of various experimental parameters (sintering temperature, sintering time, and TiH2 content) on the porosity, pore size, and pore distribution as well as phase composition in experimental alloys are investigated. It is found that in order to avoid the formation of carcinogenic pure Ni phase, the porous NiTi alloy should be synthesized over a temperature of 1223 K. This gives NiTi as the main phase without any elemental phase. Substitution of Ti by TiH2 is more economic and more favorable to obtain homogeneous porous NiTi alloy. A proper selection of initial powders, ball-milling, pressing, and sintering process makes it possible to achieve the porous NiTi alloy with desired properties.

The Influence of Sewage Fat Composition on Rheological Behavior of Metal Injection Moulding

2014 ◽  
Vol 660 ◽  
pp. 38-42 ◽  
Author(s):  
Azriszul Mohd Amin ◽  
Mohd Halim Irwan Ibrahim ◽  
Rosli Asmawi ◽  
Najwa Mustapha
Keyword(s):  
Activation Energy ◽  
Shear Rate ◽  
Injection Moulding ◽  
Rheological Characteristic ◽  
Flow Behaviour ◽  
Characteristic Analysis ◽  
Metal Injection Moulding ◽  
Flow Behaviour Index ◽  
Binder Ratio ◽  
Behaviour Index

Influence of sewage ratio or Fat Oil Grease (FOG) on the feedstock rheological characteristic for optimal binder formulation in metal injection moulding is evaluated besides Polypropylene (PP) as a backbone binder. Powder loading of 62% of water atomised SS316L being used here to determine the possibility of the best binder formulation which could be optimised for optimal powder loading base on rheological characteristic analysis. Two binder formulations of PP to SF being selected here are 60/40, 50/50 and 40/60 accordingly with the powder loading of 62% each binder formulation. The analysis will be base on viscosity, shear rate, temperature, activation energy, flow behaviour index and moldability index. It is found that from rheological result views, binder with composition of 60/40 and 50/50 exhibit pseudoplastic behaviour or shear thinning where the viscosity decrease with increasing shear rate. For 40/60 binder ratio is not suitable since the behaviour of the flow indicates dilatants behaviour. After considering all the criteria in terms of flow behaviour index, activation energy, viscosity and mouldability index, binder with ratio of 60/40 is evolve as a good selections.

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