scholarly journals Studi sifat mekanik Magnesium AZ31 hasil proses pengecoran tekan (squeeze casting)

2018 ◽  
Vol 11 (1) ◽  
pp. 1
Author(s):  
Muhammad Iqbal ◽  
Irza Sukmana ◽  
Yanuar Burhanuddin
Keyword(s):  
Mechanical Properties ◽  
Squeeze Casting ◽  
Chemical Properties ◽  
Holding Time ◽  
Hydraulic Pressure ◽  
Casting Method ◽  
Bone Implant ◽  
Magnesium Az31 ◽  
Temperature Parameter ◽  
And Chemical Properties

Magnesium forms 2% in the earth's crust, magnesium is widely used in industry.  For example, industrial machinery and electronics, and many developed in the field of biomedicine, especially in the field of orthopedics.  Magnesium about 60% is present in the human bones, therefore it has great potential for human body implants.  However, it is necessary to increase the mechanical and chemical properties of magnesium in order to be used for bone implant materials.  Production process using squeeze casting method.  Through this method, Liquid metal is given hydraulic pressure, so the mechanical properties of magnesium were better. In this research use temperature parameter = 450?C, pressure = 300 MPa, duration of press 1 minute and variation of holding time 7 and 9 minutes.  Magnesium AZ31 increased compared with samples without treatment.  Tensile strength with holding time 7 minutes equal to120.27 MPa, holding time 9 minutes was 128.77 MPa, and samples without treatment of was 94.63 MPa.  The magnesium hardness value of AZ31 decreased at 7 minute detention was 39 VHN, compared with the sample without treatment of was 41.8 VHN.  And the hardness value increased at holding time 9 minutes equal to 46.2 VHN.  However, it should be noted that excessive overheating and holding time may lead to decrease in magnesium mechanical properties of AZ31. Magnesium membentuk 2% pada kerak bumi, magnesium banyak digunakan pada industri.   Misalnya, industri mesin dan elektronik, dan banyak dikembangkan pada bidang biomedik, terutama di bidang orthopedi.  Magnesium sekitar 60% ada pada tulang manusia, oleh karna itu berpotensi besar untuk implan tubuh manusia. Namun, diperlukan peningkatan sifat mekanik dan kimia magnesium agar dapat digunakan untuk bahan implan tulang.  Proses produksi menggunakan metode pengecoran tekan. Melalui metode ini, logam cair diberi tekanan hidrolik, sehingga sifat mekanik magnesium lebih baik. Dalam penelitian ini menggunakan parameter temperatur = 450?C, tekanan = 300 MPa, durasi tekan 1 menit dan variasi holding time 7 dan 9 menit.  Magnesium AZ31 meningkat dibandingkan sampel tanpa perlakuan.  Kekuatan tarik dengan holding time 7 menit sebesar 120,27 MPa, holding time 9 menit sebesar 128,77 MPa, dan sampel tanpa perlakuan sebesar 94,63 MPa. Nilai kekerasan magnesium AZ31 menurun pada holding time 7 menit sebesar 39 VHN, bila dibandingkan sampel tanpa perlakuan sebesar 41,8 VHN.  Dan nilai kekerasan meningkat pada holding time 9 menit sebesar 46,2 VHN. Namun, perlu diperhatikan pemanasan dan holding time yang berlebih (over heat) dapat mengakibatkan penurunan sifat mekanik magnesium AZ31.

Study of Whiskers to be Used in Composite Materials

2021 ◽  
Vol 316 ◽  
pp. 51-55
Author(s):  
Tamara I. Shishelova ◽  
Vadim V. Fedchishin ◽  
Mikhail A. Khramovskih
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Chemical Properties ◽  
High Strength ◽  
Rapid Expansion ◽  
Physical And Chemical Properties ◽  
Reinforcement Fiber ◽  
Object Of Study ◽  
Physical And Chemical ◽  
And Chemical Properties

Rapid expansion of technologies poses higher requirements to structural materials and items made of them. Conventional materials are being replaced by composite materials (composites). Different additives enhancing the properties of initial materials are used as reinforcement fibers of composites. Utilization of micro-and nanosize particles for production of present-day materials is paid much attention to. Whiskers are among such materials. These crystals have high strength, high chemical and temperature resistance. But for rational utilization of whickers of different chemical composition in composite materials one should know their physical and chemical properties. Objectives of the paper: to study physical and chemical properties of whiskers in different compounds, their composition and structure; to prove experimentally the feasibility of utilizing whiskers as a reinforcement fiber of composite materials. Object of study: specimens of whiskers of silicon nitride (Si3N4), aluminum oxide (Al2O3), aluminum nitride (AlN), and mullite (Al6Si2O13). Methods of investigation: thermal study of specimens, study of mechanical properties and chemical strength, and IR-spectroscopy. Results of study: specimens of whiskers have been studied and their mechanical properties have been tabulated for comparison. Extensive thermal investigation was followed by deduction of regularities and identification of chemical properties of whiskers. IR-spectra of whiskers have been studied and conclusions on molecular composition and on presence of impurities in some whiskers have been made.

scholarly journals Biocompatible Material from Indonesian Natural Resource of Wild Silkmoth Cocoon

2018 ◽  
Vol 1 (2) ◽  
pp. 47
Author(s):  
Tjokorda Gde Tirta Nindhia ◽  
Zdenek Knejzlík ◽  
Tomáš Ruml ◽  
I Wayan Surata ◽  
Tjokorda Sari Nindhia
Keyword(s):  
Mechanical Properties ◽  
Natural Resource ◽  
Chemical Properties ◽  
Hot Water ◽  
Physical And Chemical Properties ◽  
Living Things ◽  
Biocompatibility Testing ◽  
Good Biocompatibility ◽  
Physical And Chemical ◽  
And Chemical Properties

Silk can be produced by spider or insect and have prospect as biomaterial for regenerative healing in medical treatment. Silk having physical and chemical properties that support biocompatibility in the living things..In this research, silk that was obtained from Indonesia natural resource of Attacus atlas silkmoth was explored and then will be  developed for biocompatible biomaterial. The treatment with NaOH was developed to separate the fiber from the cocoon. The obtained fiber is investigated its mechanical property by performing tensile test for single fiber. The biocompatibility testing was conducted with human cell (osteosarccoma) cultivation. The result identify that separation by using NaOH yield better better mechanical properties comparing konvenstional method with boiling in hot water. Biocompatibility testing indicate that the the fiber having good biocompatibility.

Mechanical Properties of Parts with Tin Coating Obtained by Hot-Dip Method

2016 ◽  
Vol 246 ◽  
pp. 113-116 ◽  
Author(s):  
Jacek Mendala
Keyword(s):  
Mechanical Properties ◽  
Chemical Properties ◽  
Solid Metal ◽  
Zinc Bath ◽  
Tin Coating ◽  
Metal Part ◽  
Metal Bath ◽  
Premature Failure ◽  
Liquid Metal Bath ◽  
And Chemical Properties

Hot-dip process leading to creation of protective coating is one of the effective ways to protect metals from corrosion. It provides the way to obtain the coating with required physical, mechanical and chemical properties. However, contact of solid metal part with the liquid metal bath during this process may lead to changes in mechanical properties or, in extreme cases, to premature failure of the part. This is mainly due to the effect called LME. The author has researched the likelihood of occurrence of this phenomenon in parts subjected to metallization in zinc bath or in zinc bath with additions of tin or bismuth. The presented results are a continuation of these research and include an assessment of the possibility of LME occurrence in parts metallized in tin bath and subjected to external stress.

Influence of Fluidized Fly Ash on the Selected Physical-Mechanical Properties of the Autoclaved Aerated Concrete

2014 ◽  
Vol 899 ◽  
pp. 409-414 ◽  
Author(s):  
Alena Struhárová ◽  
Stanislav Unčík ◽  
Svetozár Balkovic ◽  
Mária Hlavinková
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Amorphous Phases ◽  
Autoclaved Aerated Concrete ◽  
Aerated Concrete ◽  
Free Cao ◽  
Physical And Chemical ◽  
And Chemical Properties

Fluidized fly ash has different physical and chemical properties compared to fly ash emerging from classic combustion. It contains amorphous phases resulting from a dehydration of clay minerals as well as unreacted sorbent of CaCO3, free CaO and anhydrite (CaSO4). Work targets the possibilities of production of an autoclaved aerated concrete (AAC) from fluidized fly ash, and its influence on particular physical-mechanical properties of autoclaved aerated concrete.

scholarly journals Effect of Copper (II) Sulfate on the Properties of Urea Formaldehyde Adhesive

Polymers ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 94
Author(s):  
Hui Zhao ◽  
Xianzhen Li ◽  
Xi Wang ◽  
Mianwu Meng ◽  
Xiujian Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Urea Formaldehyde ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Sulfate Content ◽  
Formaldehyde Release ◽  
Uf Resin ◽  
Effect Of Copper ◽  
Physical And Chemical ◽  
And Chemical Properties

The purpose of this work is to investigate the effects of copper (II) sulfate on formaldehyde release and the mechanical properties of urea formaldehyde (UF) adhesive. Copper (II) sulfate has been used as a formaldehyde scavenger in UF resin, and its effects on the physical and chemical properties of UF adhesive have been studied. Moreover, the mechanical properties and formaldehyde release of plywood prepared with modified UF resin have been determined. The UF resin has been characterized by Fourier-transform infrared (FTIR) spectroscopy and thermogravimetric analysis (TGA). FTIR spectra showed that the addition of copper (II) sulfate to the UF resin did not affect the infrared (IR) absorptions of its functional groups, implying that the structure of UF was not modified. Further results showed that: the free formaldehyde content of the UF resin by the incorporation of 3% copper (II) sulfate was 0.13 wt.%, around 71% lower than that of the control UF adhesive. With a copper (II) sulfate content of 3%, the formaldehyde release from treated plywood was 0.74 mg·L−1, around 50% lower than that from the control UF adhesive, and the bonding strength reached 1.73 MPa, around 43% higher than that of the control UF adhesive.

scholarly journals Comparative Analysis of Structure and Properties of Stereoscopic Cocoon and Flat Cocoon

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Bin Zhou ◽  
Huiling Wang ◽  
Hongtao Zhou ◽  
Ke Wang ◽  
Shudong Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Chemical Properties ◽  
Morphological Characteristics ◽  
Morphological Structure ◽  
Variable Structure ◽  
Fiber Fineness ◽  
The Common ◽  
Physical And Chemical ◽  
Structure And Functions ◽  
And Chemical Properties

Abstract Cocoon is a kind of natural biopolymer material with reasonable structure and various functions. However, its structure and functions are often destroyed in practical application. In this study, we took common Bombyx Mori as the research object, and provided different cocooning sites for single or multiple silkworms to construct common stereoscopic cocoons (“normal cocoons” [NC]) and flat cocoons (“single-silkworm flat cocoons” [SFC] and “multi-silkworm flat cocoons” [MFC]), respectively, and compared the morphological structure and basic properties of these cocoons. The study found that the flat cocoons have similar multi-layered variable structure and characteristics compared to those of the common cocoons; also, morphological characteristics and physical and chemical properties of silk fiber from outer layer to inner layer, such as sericin content, fiber fineness, and change rule of basic mechanical properties, are completely consistent with those of the common cocoons. It can be considered that the flat cocoons are constructed by silkworms in the same “procedural” process as that of common cocoons. Due to the expansion of cocooning space, the mechanical properties of fibers are significantly improved. By controlling the size of the cocooning space or the quantity of silkworms cocooning simultaneously, and the time of spinning, a cocoon material with controllable thickness, weight per square meter, porosity, and number of cocoon layers can be obtained as a composite material for direct application.

scholarly journals Investigate the mechanical properties of Si/Ge (Ge/Si) core-shell nanowires: A molecular dynamics study

2020 ◽  
Vol 3 (4) ◽  
pp. first
Author(s):  
Vuong Van Thanh ◽  
Tran The Quang ◽  
Nguyen Tuan Hung ◽  
Vu Le Huy ◽  
Do Van Truong
Keyword(s):  
Mechanical Properties ◽  
Molecular Dynamics ◽  
Elastic Modulus ◽  
Lattice Mismatch ◽  
Chemical Properties ◽  
Core Shell ◽  
The Core ◽  
Axial Tensile ◽  
Physical And Chemical ◽  
And Chemical Properties

Nanowires (NWs) have been used increasingly in practice due to their outstanding mechanical, physical, and chemical properties. In this paper, we use the molecular dynamics (MD) method to investigate the mechanical properties of NWs (Si/Ge, Ge/Si) with a core-shell structure under the axial tensile strain along the <100>/{100} direction. Our results show that the strength and elastic modulus of Ge/Si and Si/Ge NWs depend on the composition and size of the core/shell crosssection. The strength and strain of Ge/Si NW decrease with increasing the size of the core crosssection because of the lattice mismatch between two layers of core/shell materials. The elastic modulus of Ge/Si NWs increases with the increasing the size of the core cross-section, while the elastic modulus of the Si/Ge NW decreases. In addition, the theoretical strength and elastic modulus of Ge/Si NWs reduce with the growth of the temperature. Furthermore, we also investigate the effect of strain rate on the mechanical properties of the Ge/Si NWs. The obtained results of the study provide the intrinsic properties of the core-shell NWs and also help in the design and fabrication of electronic and optical devices based on the Ge/Si NWs.

scholarly journals Graphite Modified Polylactide (PLA) for 3D Printed (FDM/FFF) Sliding Elements

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1250 ◽  
Author(s):  
Robert E. Przekop ◽  
Maciej Kujawa ◽  
Wojciech Pawlak ◽  
Marta Dobrosielska ◽  
Bogna Sztorch ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Stress ◽  
Low Cost ◽  
Chemical Properties ◽  
Spare Parts ◽  
The Other ◽  
Graphite Content ◽  
Before And After ◽  
3D Printed ◽  
And Chemical Properties

With the development of 3D printing technology, there is a need to produce printable materials with improved properties, e.g., sliding properties. In this paper, the authors present the possibilities of producing composites based on biodegradable PLA with the addition of graphite. The team created composites with the following graphite weight contents: 1%, 2.5%, 5%, 7.5%, and 10%. Neat material was also subjected to testing. Tribological, mechanical, and chemical properties of the mentioned materials were examined. Measurements were also made after keeping the samples in ageing and climatic ovens. Furthermore, SEM observations of samples before and after friction tests were carried out. It was demonstrated that increasing graphite content caused a significant decrease in wear (PLA + 10% graphite had a wear rate three times lower than for a neat material). The addition of graphite did not adversely affect most of the other properties, but it ought to be noted that mechanical properties changed significantly. After conditioning in a climatic oven PLA + 10% graphite has (in comparison with neat material) 11% lower fracture stress, 47% lower impact strength, and 21% higher Young’s modulus. It can be certainly stated that the addition of graphite to PLA is a step towards obtaining a material that is low-cost and suitable for printing sliding spare parts.

Untersuchungen zum Einfluss der thermischen Vorbehandlung auf das Sorptionsverhalten und ausgewählte mechanische Eigenschaften von Fichtenholz | Examinations of the influence of thermal treatment on certain mechanical properties of spruce (reviewed paper)

2005 ◽  
Vol 156 (2) ◽  
pp. 47-51 ◽  
Author(s):  
Fritz Bächle ◽  
Peter Niemz
Keyword(s):  
Mechanical Properties ◽  
Thermal Treatment ◽  
Chemical Properties ◽  
Thermal Treatments ◽  
Physical And Chemical Properties ◽  
Mechanische Eigenschaften ◽  
Physical And Chemical ◽  
And Chemical Properties

A range of mechanical, physical and chemical properties were tested on spruce, which had been subjected to diverse thermal treatments. The results of the examination are presented in tables and graphic figures.

scholarly journals Effective Mechanical Properties and Thickness Determination of Boron Nitride Nanosheets Using Molecular Dynamics Simulation

Nanomaterials ◽  
2018 ◽  
Vol 8 (7) ◽  
pp. 546 ◽  
Author(s):  
Venkatesh Vijayaraghavan ◽  
Liangchi Zhang
Keyword(s):  
Mechanical Properties ◽  
Boron Nitride ◽  
Chemical Properties ◽  
Dynamics Simulation ◽  
Boron Nitride Nanosheets ◽  
Wide Scatter ◽  
Physical And Chemical ◽  
Effective Mechanical Properties ◽  
And Chemical Properties

Research in boron nitride nanosheets (BNNS) has evoked significant interest in the field of nano-electronics, nanoelectromechanical (NEMS) devices, and nanocomposites due to its excellent physical and chemical properties. Despite this, there has been no reliable data on the effective mechanical properties of BNNS, with the literature reporting a wide scatter of strength data for the same material. To address this challenge, this article presents a comprehensive analysis on the effect of vital factors which can result in variations of the effective mechanical properties of BNNS. Additionally, the article also presents the computation of the correct wall thickness of BNNS from elastic theory equations, which is an important descriptor for any research to determine the mechanical properties of BNNS. It was predicted that the correct thickness of BNNS should be 0.106 nm and the effective Young’s modulus to be 2.75 TPa. It is anticipated that the findings from this study could provide valuable insights on the true mechanical properties of BNNS that could assist in the design and development of efficient BN-based NEMS devices, nanosensors, and nanocomposites.

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