Effect of Using Different Compositions and PU Foam Template to Produce Cobalt Chromium Molybdenum (CoCrMo) Foams

2016 ◽  
Vol 840 ◽  
pp. 202-206
Author(s):  
Nur Suliani Abdul Manaf ◽  
Sufizar Ahmad ◽  
Rosdi Ibrahim
Keyword(s):  
Bone Cells ◽  
Methyl Cellulose ◽  
Sem Analysis ◽  
Vacuum Furnace ◽  
Sintering Process ◽  
Cobalt Chromium ◽  
Pu Foam ◽  
Different Types ◽  
Cobalt Chromium Molybdenum ◽  
Pu Foams

Slurry dipping is a simple and popular method of producing porous and interconnected foams using a metallic slurry. The advantage of the network-like metal foams is it exhibits a natural bone-like structure which enables ingrowth of bone cells and blood vessels. The aim of the present study was to investigate the effect of using difference composition and scaffold to produce Cobalt Chromium Molybdenum (CoCrMo) foams. The CoCrMo slurry was prepared by using different composition of CoCrMo powder which was 60wt%, 65wt% and 70wt%. Also two different types of scaffold were used in this study. The CoCrMo slurry was produced by mixing CoCrMo powder with Polyethylene Glycol (PEG), Carboxyl Methyl Cellulose (CMC) and distilled water. Then, polyurathane foam template was dipped in CoCrMo slurry and dried at room temperature. Sintering process was running by vacuum furnace at high temperature, 1200°C. The CoCrMo foam was characterized by using a Scanning Electron Microscopy (SEM) analysis. The physical properties of CoCrMo foam was analyzed by porosity and bulk density test that was Archimedes method. From the study it was expected that the composition of metallic slurry play important roles to produce a CoCrMo foam. In order to orthopaedics application to apply in cancellous bone, highest value of porosity from PU foams type (a) was most suitable result to use. This is due to the value of porosity that generate that was 65.2%.

Assessing the Physical Properties of Cobalt Chromium Molybdenum (CoCrMo) Foams with Different Composition

2016 ◽  
Vol 1133 ◽  
pp. 314-318
Author(s):  
Nur Suliani Abdul Manaf ◽  
Sufizar Ahmad ◽  
Rosdi Ibrahim
Keyword(s):  
Physical Properties ◽  
Room Temperature ◽  
Bone Cells ◽  
Methyl Cellulose ◽  
Sem Analysis ◽  
Vacuum Furnace ◽  
Sintering Process ◽  
Cobalt Chromium ◽  
Polymeric Foam ◽  
Cobalt Chromium Molybdenum

Replication or slurry dipping is a simple and popular method of producing porous and interconnected foams using a metallic slurry. The advantage of the network-like metal foams is it exhibits a natural bone-like structure which enables ingrowth of bone cells and blood vessels. The aim of the present study was to investigate the physical properties of Cobalt Chromium Molybdenum (CoCrMo) foams after sintering process using vacuum furnace. The CoCrMo slurry was prepared by using different composition of CoCrMo powder which was 50wt%, 55wt%, 60wt%, 65wt% and 70wt%. The CoCrMo slurry was produced by mixing CoCrMo powder with Polyethylene Glycol (PEG), Carboxyl Methyl Cellulose (CMC) and distilled water. Then, polymeric foam template was impregnated in CoCrMo slurry and dried at room temperature. Sintering was carried out in a high temperature vacuum furnace at 1300°C. The CoCrMo foam was characterized by using a Scanning Electron Microscopy (SEM) analysis. The physical properties of CoCrMo foam was analyzed by porosity and bulk density test that was Archimedes method. From the study it was expected that the composition of metallic slurry play important roles to produce a CoCrMo foam. The best composition that obtained in this experiment was 70wt%. The porosity and density value for 70wt% of composition were 20.3% and 2.63g/cm3. The higher composition of metallic slurry will decrease the density and will increase the porosity.

The Formation of Cobalt Chromium Molybdenum (CoCrMo) Foams Fabricated by Slurry Method

2016 ◽  
Vol 840 ◽  
pp. 197-201
Author(s):  
Sufizar Ahmad ◽  
M. Rosli ◽  
Nur Suliani Abdul Manaf ◽  
Murni Faridah Mahammad Rafter ◽  
Fazimah Mat Noor
Keyword(s):  
Sintering Temperature ◽  
Average Pore Size ◽  
Sem Analysis ◽  
High Porosity ◽  
Sintering Process ◽  
Cobalt Chromium ◽  
Average Pore ◽  
Slurry Method ◽  
Cobalt Chromium Molybdenum ◽  
Orthopedic Applications

Cobalt Chromium Molybdenum (CoCrMo) is a metal that are widely used in the biomedical field of orthopedic applications. CoCrMo foam was developed in the form of a porous structure where it has a high porosity on the surface with the different pore sizes and shapes. This research is intended to produce CoCrMo foam by using slurry method and to study the effect of composition and sintering temperature on the metal foams. The slurry of CoCrMo was prepared by mixing the binder materials of Methylcellulose (CMC), Polyethylene Glycol (PEG) and distilled water for an hour. Followed by mixing and stirring the CoCrMo powder for another 1 hour until it becomes slurries. Polyurethane (PU) foam was then impregnated into the slurry and dried for a day in the oven with 60 °C. Sintering process is carried out at temperature of 1000 °C, 1100 °C and 1200 °C using a tube furnace. Then sample of CoCrMo foam was going through a shrinkage measurement, microstructure analysis by using Scanning Electron Microscope (SEM), analysis of element by using Energy Diffraction X-ray (EDX) and also the density and porosity test by using Archimedes method. The sample with the composition of 65wt% was the best result in this experiment. While sintering temperature of 1200 °C produced the highest number of porosities. The shrinkage percentage is from 2.67% to 14.13%. The density obtained is in between 1.538 g/cm3 and 2.706 g/cm3 while the percentage of porosity is from 50.284% to 78.934%. The average pore size is in the range of 249.63μm to 445.38μm. The best sintering temperature and composition to produced high porosity were on 1200 °C and 65wt%.

Morphological Analysis of SS316L Foam Produced by Using Slurry Method

2015 ◽  
Vol 1087 ◽  
pp. 68-72 ◽  
Author(s):  
N.I. Mad Rosip ◽  
Sufizar Ahmad ◽  
Khairur Rijal Jamaludin ◽  
Fazimah Mat Noor
Keyword(s):  
Morphological Analysis ◽  
Metal Foam ◽  
Methyl Cellulose ◽  
Vacuum Furnace ◽  
Sintering Process ◽  
Different Temperatures ◽  
Slurry Method ◽  
Calcium Silicon ◽  
Gas Entrapment ◽  
Pu Foams

Metal foams had been developed years ago by researchers. There were various methods used to produce metal foam such as slurry, compaction, gas entrapment technique and casting methods. In this study, slurry method used to produce SS316L foam with powder compositions 50wt%, 55wt% and 60wt%. Polyethylene Glycol (PEG) and Carboxyl Methyl Cellulose (CMC) were used as binder which was mixed with SS316L powder and distilled water. Polyurethane (PU) foams were impregnated with slurry by pressed out to cover every pores and struts of PU foams. Then, the coated PU foams were dried in the oven for 24 hours at 30°C, followed by sintering process in the vacuum furnace at three different temperatures which were 1200°C, 1250°C and 1300°C. There were Oxygen, Aluminium, Calcium, Silicon, Chromium, Nickel, Ferrous and Molybdenum elements found in the SS316L foams.

Production of Cobalt Chromium Molybdenum (CoCrMo) Foam by Replication Method

2015 ◽  
Vol 1087 ◽  
pp. 91-95 ◽  
Author(s):  
Nur Suliani Abdul Manaf ◽  
Sufizar Ahmad ◽  
Rosdi Ibrahim ◽  
Zakiah Kamdi ◽  
A. Ismail
Keyword(s):  
Methyl Cellulose ◽  
Sintering Process ◽  
Cobalt Chromium ◽  
X Ray Diffraction ◽  
Wear Performance ◽  
Polymeric Foam ◽  
X Ray ◽  
Replication Method ◽  
Composition And Structure ◽  
Cobalt Chromium Molybdenum

Cobalt Chromium Molybdenum (CoCrMo) generally known as a highly resistant to corrosion and wear performance. CoCrMo was prepared using replication method. The aim of this paper is to producing CoCrMo foam that will be given to consider the properties of CoCrMo foam after sintering process. The CoCrMo slurry was produced by mixing CoCrMo powder with Polyethylene Glycol (PEG), Carboxyl Methyl Cellulose (CMC) and distilled water. The polymeric foam template was impregnated in CoCrMo slurry and dried at room temperature. Sintering was carried out in a high temperature tube furnace at 1300°C. After the sintering process, the microstructure of the CoCrMo foam produced was observed by Scanning Electron Microstructure (SEM) and the elemental analysis was carried by Energy Dispersive X-ray Spectroscopy (EDS). While, X-Ray Diffraction (XRD) is used to characterize the chemical composition and structure of the samples. The EDS analysis performed in all samples with composition of 65 wt % CoCrMo foam show the presence of of Cr, Mo, Co, Mn, C, O, Al, Si and Ca. From the XRD results, the pattern that was detected all the peak was PDF 2007: 00-041-0943(Cobalt Nitride).

The Influence of SS316L Foam Fabrication Parameter Using Powder Metallurgy Route

2014 ◽  
Vol 974 ◽  
pp. 174-178
Author(s):  
N.I. Mad Rosip ◽  
Sufizar Ahmad ◽  
Khairur Rijal Jamaluddin ◽  
F. Mat Nor
Keyword(s):  
Sintering Temperature ◽  
Point Contact ◽  
Methyl Cellulose ◽  
Vacuum Furnace ◽  
Sintering Process ◽  
Replication Method ◽  
Different Temperatures ◽  
Sem Micrograph ◽  
Slurry Method ◽  
Fabrication Parameter

Metal foams are widely produced by using different techniques such as compaction and replication method. In this study, slurry method also known as replication method has been used to produce SS316L foams. SS316L powders (50wt% and 60wt%) were mixed with the binders and distilled water by using mechanical stirrer. Polyethylene Glycol (PEG) and Carboxyl Methyl Cellulose (CMC) were used as binders. Polyurethane (PU) foam was used as scaffold and dipped into SS316L slurry then dried in room temperature for 24 hours. Sintering process has been done in two different temperatures which were 1200°C and 1300°C in vacuum furnace. The morphological study was performed using Scanning Electron Microscopy (SEM) and Energy Dispersive X-Ray (EDX). The SEM micrograph showed that the cells were interconnected and the structures become denser as the sintering temperature increase. The average pores size is ranging from 252.8 μm-353.8 μm, while strut size ranging from 50.2 μm-79.9 μm based on SEM micrograph analysis. The elemental analysis from EDX showed the element presence in the SS316L foam remain from SS316L powder which are Chromium (Cr), Nickel (Ni), Molybdenum (Mo), Cooper (Cu), Nitrogen (N2), Sulphur (S) and Silicon (Si). Higher sintering temperature contributes better grain growth between particles where the point-contact between the particles expanded and disappear the small pores.

Influence of carbon nanotubes on the properties of biopolyol based polyurethane foams

2021 ◽  
pp. 026248932198900
Author(s):  
Rujuta Dhoke ◽  
Abhishek Ojha ◽  
Ashutosh Kr Chaudhary ◽  
RP Vijayakumar
Keyword(s):  
Carbon Nanotubes ◽  
Sugarcane Bagasse ◽  
Rice Husk ◽  
Sem Analysis ◽  
Polyurethane Foams ◽  
Rigid Foam ◽  
Morphological Studies ◽  
Pu Foam ◽  
Liquid Products ◽  
Pu Foams

Biopolyols were obtained from liquefaction of sugarcane bagasse and rice husk. Acid and hydroxyl numbers were determined for estimating the polyol value of the liquid products. These prepared biopolyols were mixed with the commercial polyol for the preparation of polyurethane foam (PU). To study the effects of biopolyol on properties of PU foam, various ratios of biopolyol to commercial polyol were used. It was observed that the density and foaming time of the PU foam increases with the increase in biopolyol content. The calculated Isocyanate index showed that sugarcane bagasse polyol can be used to make flexible foam and that rice husk can be used to make rigid foam. Foaming times and full rise times increased with increase in the biopolyol content. The Fourier-transform infrared spectroscopy (FTIR) spectra of prepared foams showed the characteristic peaks related to PU foam. The morphological studies were carried out using scanning electron microscopy (SEM). Thermal conductivity tests proved that the synthesized PU foams can be used as insulating materials. Further, PU foams were also prepared with the incorporation of carbon nanotubes (CNTs) in the polyol. The densities, thermal conductivities and SEM analysis of PU foams with and without carbon nanotubes were compared.

UGI KC35N

Alloy Digest ◽  
2014 ◽  
Vol 63 (12) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Shear Strength ◽  
Physical Properties ◽  
Heat Treating ◽  
Molybdenum Alloy ◽  
Cobalt Chromium ◽  
Austenitic Structure ◽  
Nickel Cobalt ◽  
Cobalt Chromium Molybdenum

Abstract UGI KC35N is a nonmagnetic nickel-cobalt-chromium-molybdenum alloy with a fully austenitic structure. This datasheet provides information on composition, physical properties, elasticity, and shear strength. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Co-124. Producer or source: Schmolz + Bickenbach USA Inc..

scholarly journals Marginal Adaptation and Micropermeability of Class II Cavities Restored with Three Different Types of Resin Composites—A Comparative Ten-Month In Vitro Study

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1660
Author(s):  
Sevda Mihailova Yantcheva
Keyword(s):  
Methylene Blue ◽  
In Vitro Study ◽  
Sem Analysis ◽  
Marginal Adaptation ◽  
Resin Composites ◽  
Polymerization Shrinkage ◽  
Gingival Margin ◽  
Different Types ◽  
Ageing Period

The development of composite materials is subject to the desire to overcome polymerization shrinkage and generated polymerization stress. An indicator characterizing the properties of restorative materials, with specific importance for preventing secondary caries, is the integrity and durability of marginal sealing. It is a reflection of the effects of polymerization shrinkage and generated stress. The present study aimed to evaluate and correlate marginal integrity and micropermeability in second-class cavities restored with three different types of composites, representing different strategies to reduce polymerization shrinkage and stress: nanocomposite, silorane, and bulk-fill composite after a ten-month ageing period. Thirty standardized class ΙΙ cavities were prepared on extracted human molars. Gingival margins were 1 mm apical to the cementoenamel junction. Cavities were randomly divided into three groups, based on the composites used: FiltekUltimate-nanocomposite; Filtek Silorane LS-silorane; SonicFill-bulk-fill composite. All specimens were subjected to thermal cycles after that, dipped in saline for 10-mounds. After ageing, samples were immersed in a 2% methylene blue. Thus prepared, they were covered directly with gold and analyzed on SEM for assessment of marginal seal. When the SEM analysis was completed, the teeth were included into epoxy blocks and cut longitudinally on three slices for each cavity. An assessment of microleakage on stereomicroscope followed. Results were statistically analyzed. For marginal seal evaluation: F.Ultimate and F.Silorane differ statistically with more excellent results than SonicFill for marginal adaptation to the gingival margin, located entirely in the dentin. For microleakage evaluation: F.Ultimate and F.Silorane differ statistically with less microleakage than SonicFill. Based on the results obtained: a strong correlation is found between excellent results for marginal adaptation to the marginal gingival ridge and micropermeability at the direction to the axial wall. We observe a more significant influence of time at the gingival margin of the cavities. There is a significant increase in the presence of marginal fissures (p = 0.001). A significant impact of time (p < 0.000) and of the material (p < 0.000) was found in the analysis of the microleakage.

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