Shaping and mechanical performance of gelcasting Ti6Al4V alloys with paraffin wax and stearic acid coated on powder surface

2020 ◽  
Vol 25 ◽  
pp. 101533
Author(s):  
Yanru Shao ◽  
Fang Yang ◽  
Qian Qin ◽  
Yang Zhou ◽  
Cunguang Chen ◽  
...  
Keyword(s):  
Stearic Acid ◽  
Mechanical Performance ◽  
Paraffin Wax ◽  
Powder Surface

Investigation into the Coating and Desensitization Effect on HNIW of Paraffin Wax/Stearic Acid Composite System

2015 ◽  
Vol 34 (1) ◽  
pp. 26-37 ◽  
Author(s):  
Dong-Xu Wang ◽  
Shu-Sen Chen ◽  
Shao-Hua Jin ◽  
Qing-Hai Shu ◽  
Zhen-Ming Jiang ◽  
...  
Keyword(s):  
Stearic Acid ◽  
Composite System ◽  
Paraffin Wax

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,

scholarly journals Experimental investigation on the influence of nano-fluids used as HTF in PCM based thermal energy storage system

2020 ◽  
pp. 60-60
Author(s):  
Krishna Reddy ◽  
Meenakshi Reddy ◽  
Durga Prasad
Keyword(s):  
Stearic Acid ◽  
Volume Concentration ◽  
Storage System ◽  
Energy Storage System ◽  
Hot Water ◽  
Paraffin Wax ◽  
Nano Fluid ◽  
Working Medium ◽  
Thermal Energy Storage System ◽  
Nano Fluids

The present study investigated the enhancement of energy conservation under the principles of pure substances that exercise phase change throughout charging and discharging processes. This work primarily focused on the thermal energy storage system, where the working medium charges the PCM?s namely (Paraffin wax & stearic acid) that is normally encapsulated in spherical balls. The potentiality in charging of working medium was examined upon blending HTF (heat transfer fluid) with four nano-particles (Al2O3, CuO, TiO2 & MgO). Several volume concentration levels (0.2%, 0.5% and 0.8%) were considered for afore mentioned nanoparticles under the influence of assumed flow rates (2l/min, 4l/min and 6l/min). The experiments were carried out with various nano-fluids used as HTF for different flow rates and volume concentrations. The results showed that there is a considerable amount of reduction in charging time, in case of 6 l/min, 0.8% volume concentration and PCM as Paraffin wax, around 27.22 % for TiO2 nano-fluid, 36.66% for Al2O3 nano-fluid, 40.90% for CuO nano-fluid and 63.63% for MgO nano-fluid, and PCM used as Stearic acid, around 26.31 % for TiO2 nano-fluid, 42.10% for Al2O3 nanofluid, 47.36% for CuO nano-fluid and 68.42% for MgO nano-fluid, when compared with the conventional HTF, water. From the results, it was observed that the effect of particle concentration played an important role in the heat transfer process. During the discharging process, 210 liters of hot water withdrawn with paraffin wax used as PCM and 198 liters of hot water withdrawn with stearic acid used as PCM.

On overturning and anchoring of monolayers - I. Overturning and transfer

1954 ◽  
Vol 225 (1162) ◽  
pp. 346-356 ◽  
Keyword(s):  
Stearic Acid ◽  
Reaction Rate ◽  
Wetting Angle ◽  
Paraffin Wax ◽  
Gradual Change ◽  
Mica Substrate

The gradual change with time in the wetting angle of a drop of water placed on paraffin wax-stearic acid mixtures, is shown to be due to the emergence of the polar carboxyl heads of the acid from the wax surface and their subsequent anchoring in the water. The reaction rate is found to be unimolecular. A monolayer of 14 C-labelled stearic acid deposited on a mica strip is found to transfer molecules to another strip when brought into contact with it. The rates of transfer and the partitions at equilibrium have been determined for a variety of contacting surfaces formed by evaporating metals on to the mica substrate.

Model and Fabrication of Biomimetic Integrated Porous Core Laminated Composite

2013 ◽  
Vol 461 ◽  
pp. 397-401
Author(s):  
Jian Mei Fan
Keyword(s):  
Mechanical Performance ◽  
Glass Fibers ◽  
Laminated Composite ◽  
Core Layer ◽  
Composite Model ◽  
Paraffin Wax ◽  
Anoplophora Glabripennis ◽  
Structure Characteristics ◽  
Porous Core ◽  
Beetle Elytra

This paper deals with imitating a novel type of biomimetic integrated composite with porous core layer from the beetle elytra microstructures. Firstly,the microstructures of the elytron of Anoplophora Glabripennis, Anomala Corpulenta Motschulsky, Prosopocoilus Inclinatus and Melolonthidae were examined with SEM. Inspired by these structure characteristics, a biomimetic composite model was proposed, in which the two face layers were interconnected with a porous core layer, and there are continuous fibers embedded into these three layers to enhance mechanical performance of the laminated composite. Then a specimen of this laminated composite with porous core layer was made. The procedures include: weaving a piece of two layers space fabric by glass fibers as the preform of the composite,filling the mixed resin which contained 50% granular paraffin wax and 50% epoxy resin into the space of the fabric, putting it into a flat mold, keeping 36 hours, and finally heating the composite to remove the paraffin wax to form the porous core layer. The experiment showed that the model of integrated porous core laminated composite inspired by the beetle elytra structure is reasonable and this novel type of lightweight composite material was manufacturable.

scholarly journals Production of Candle from Oil Extract of a Legume - Soybean

2019 ◽  
Vol 9 (2) ◽  
pp. 5568-5574
Keyword(s):  
Stearic Acid ◽  
Soybean Oil ◽  
Surface Area ◽  
Extraction Method ◽  
Soxhlet Extraction ◽  
Paraffin Wax ◽  
Physical Tests ◽  
Oil Extract

This research confirmed that candles produced from oil extract of soybeans are eco-friendly and healthier alternatives to commercial candles made from paraffin wax. The soybeans were sorted, washed, crushed, dehulled and grinded prior to extraction to increase the surface area. Soybean oil is about 30% of the total soybean composition. Soxhlet extraction method was used with hexane as solvent. The extracted oil was then solidified with stearic acid to form wax inside a mold. Physical tests were carried out to prove its claims as a safer alternative to paraffin wax. The results supported the claims that soy candles are more economical and produced lesser soot than the paraffin candles.

scholarly journals Kajian Peleburan Dan Pembekuan Material Berubah Phasa Pada Thermal Storage

2018 ◽  
Vol 1 (1) ◽  
pp. 129-136
Author(s):  
Chandra A Siregar ◽  
Ilmi Abdullah ◽  
Himsar Ambarita
Keyword(s):  
Energy Storage ◽  
Stearic Acid ◽  
Phase Change ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Melting Process ◽  
Paraffin Wax ◽  
Smelting Process ◽  
Heat Value ◽  
Change Material

Kajian fenomena peleburan dan pemadatan material berubah phasa (Phasa Change Material/PCM) dilakukan untuk mengamati proses peleburan dari Paraffin Wax dan Stearic Acid. Percobaan dilakukan pada temperatur 90 0C, 85 0C, dan 80 0C dengan menggunakan kotak kaca dan durasi waktu peleburan 600 menit. Pengamatan visualisasi dilakukan dalam bentuk foto. Hasil pengamatan visualisasi menyatakan bahwa temperatur Thermal Energy Storage (TES) yang lebih tinggi bergerak keatas. Oleh karena itu, proses peleburan terlebih dahulu terjadi pada bagian atas. Selain itu, dalam proses pembekuan TES dimulai dari bagian bawah menuju ke atas. Dari hasil penelitian ditemukan bahwa Paraffin Wax lebih efektif digunakan daripada Stearic Acid karena mampu menyerap panas lebih tinggi. Pada temperatur pengujian 90 0C diperoleh nilai panas tersimpan pada Paraffin sebesar 61,84 kJ sedangkan pada Stearic Acid 57,392 kJ.   The study of the phenomenon of fusion and compaction of phase-changing materials (Phase Change Material / PCM) was carried out to observe the melting process of Paraffin Wax and Stearic Acid. The experiment was carried out at temperatures of 90 0C, 85 0C, and 80 0C using a glass box and the duration of smelting time was 600 minutes. Visualization observation is done in the form of photos. The results of visualization observations state that higher Thermal Energy Storage (TES) temperatures move up. Therefore, the smelting process first occurs at the top. In addition, in the process of freezing the TES starts from the bottom to the top. From the results of the study it was found that Paraffin Wax is more effective to use than Stearic Acid because it can absorb higher heat. At the 90 0C test temperature the heat value stored in Paraffin was 61.84 kJ while in Stearic Acid 57,392 kJ.

scholarly journals THE INFLUENCE OF RESIDUE EMULSIFIER AMOUNTS ON PROPERTIES OF NITRILE RUBBERS AND ELASTOMERIC MATERIALS BASED ON THEM

2018 ◽  
Vol 13 (5) ◽  
pp. 58-66
Author(s):  
A. O. Evdokimov ◽  
A. M. Bukanov ◽  
L. R. Lyusova ◽  
A. V. Petrogradsky
Keyword(s):  
Stearic Acid ◽  
Measurement Accuracy ◽  
Mechanical Performance ◽  
Processing Parameters ◽  
Model Compounds ◽  
Polar Solvents ◽  
Rubber Compounds ◽  
Elastomeric Materials ◽  
Key Factor ◽  
Nitrile Rubbers

The paper considers the properties of a number of commercially available Russian nitrilebutadiene rubbers (NBR) containing approximately the equal acrylonitrile amount (from 26 to 33%) in the macromolecule, but differing in the method of synthesis and isolation. The assessment ofthe influence of residual emulsifier content and also such surfactants as rosin and stearic acid introduced as technological additives on some NBR properties was performed. The technological properties of model compounds based on these NBR, in particular, Mooney viscosity, minimal and maximal torques during curing, and scorching time were determined. It was shown that both residual emulsifier amounts and introduced surfactants decrease the viscosity of the compounds and increase the curing time. It was noted that rosin acts in a different manner in comparison with stearic acid. In particular, stearic acid acting as an interstructural plasticizer affects viscosity decrease in a greater degree. The mechanical performance of vulcanizatesbased on rubber compounds considered in the paper was also determined. It was shown that the surfactants effect on the mechanical properties is negligible and is within the measurement accuracy. Nevertheless, the NBRs obtained with various emulsifiers differ essentially and can’t be replaceable without revising both the rubber compounds recipes and processing parameters. The vulcanizates resistance to some organic solvents and water was also studied. It was shown that the acrylonitrile content in the rubber macromolecule is the key factor affecting the resistance to non-polar solvents. At the same time it was found that the vulcanizates containing residual emulsifier amounts tend to the swelling index increase. In general, the surfactants effect on the swelling index is ambiguous, and it requires deeper research.

Study on Manufacture of 2:17 Sm-Co Magnets by Powder Injection Molding

2005 ◽  
Vol 475-479 ◽  
pp. 2143-2146
Author(s):  
Hai Qing Yin ◽  
Cheng Chang Jia ◽  
Xuan Hui Qu
Keyword(s):  
Injection Molding ◽  
Stearic Acid ◽  
High Density Polyethylene ◽  
Powder Injection Molding ◽  
High Density ◽  
Paraffin Wax ◽  
Powder Injection ◽  
Magnetic Characteristics ◽  
Thermoplastic Polymer ◽  
Thermal Debinding

Manufacture of 2:17 Sm-Co magnets by powder injection molding was investigated. The binder of thermoplastic polymer was selected as the wax-based system including paraffin wax, stearic acid and high density polyethylene. Before mixing with paraffin wax and high density polyethylene, the powder of 5-8 µm was coated by stearic acid. The molding compacts were obtained under 200°C without deficits. Solvent debinding and thermal debinding were combined to remove the binder. The basic magnetic characteristics of the specimen were of the same level as those by powder metallurgy technique, which indicated that to fabricate 2:17 Sm-Co magnets by powder injection molding was feasible.

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