The Effect of Variation Concentration Cristobalite Silica from Natural Silica Sand to Hydrophobicity on Steel Plate Surface

2021 ◽  
Vol 1028 ◽  
pp. 397-402
Author(s):  
Mochamad Zainuri ◽  
Lana Awathifi ◽  
Linda Silvia ◽  
Triwikantoro ◽  
Bintoro Anang Subagyo
Keyword(s):  
Permanent Magnets ◽  
Steel Plate ◽  
Silica Sand ◽  
Synthesis Process ◽  
Plate Surface ◽  
Surface Geometry ◽  
Water Contact ◽  
Natural Sand ◽  
Silica Powder ◽  
Pure Silica

In this research, pure silica powder has been synthesized from the sand of the Bangka-Belitung Islands. Natural sand is extracted with permanent magnets and immersed with HCl to obtain pure silica, followed by coprecipitation and calcination processes at a temperature of 900 °C for 10 hours. The final result of the synthesis process is pure silica powder in the cristobalite phase (83.03% wt) and the tridymite phase (16.97% wt). The synthesized silica powder is used as a modification on topcoat of steel to increase the hydrophobicity of steel plate surface so that it can reduce the rate of corrosion. Steel plate has been painted by using the brush painting method and consists of three layers, namely the primary layer, midcoat and topcoat. The variation in this research is the concentration of silica powder on the topcoat of steel such as 0% wt (sample 1), 3% wt (sample 2), 6% wt (sample 3), 9% wt (sample 4), and 12% wt. (sample 5). These variations have an effect on the surface geometry of the steel plate, namely the surface gets rougher as the concentration of silica powder is mixed. The hydrophobicity of the steel plate can be seen from the measurement Water Contact Angle (WCA). The WCA using fresh water in sample first until five’th are 75,828 ̊, 90 ̊, 91,397 ̊ 96,520 ̊, and 104 ̊, respectively. While the WCA using seawater in sample first, second and fourth are 80.618 ̊, 102 ̊, and 104.56 ̊, respectively.

Enhancing the Value of Local Silica Sand from Bancar as a Fuel-Cell Sealing Material

2015 ◽  
Vol 1112 ◽  
pp. 262-265 ◽  
Author(s):  
Egidius Dewa ◽  
Musyarofah ◽  
Upik Nurbaiti ◽  
Triwikantoro ◽  
Sukma Firdaus ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Rietveld Method ◽  
Solid State Reaction Method ◽  
Ceramic Composites ◽  
Liquid Phase Sintering ◽  
Silica Sand ◽  
Natural Sand ◽  
Silica Powder ◽  
Pure Silica ◽  
Sealing Material

A prospective fuel cell sealing material using silica sand from Bancar, Tuban, East Java has been investigated. The investigation was aimed to enhance the value of such natural sand and was started by a treatment using magnetic separation and immersion with HCl to produce pure silica powder. Ceramic composites were then synthesized by a solid state reaction method by mixing the silica powder, magnesia (MgO), and 5-20wt% of boria (B2O3), pressing the mixture into pellets and finally sintering them at 1150 °C for 4 hours. By Archimedes method, it was found that the addition of B2O3 is favorable to reduce the porosity of composites with a maximum value reaching 0.68(0)% for the composite with 20% B2O3. An X-ray diffraction technique revealed that a liquid phase sintering had occurred, indicated by the appearance of quartz (SiO2), forsterite (Mg2SiO4) and protoenstatite (MgSiO3) in the sample without B2O3 and quartz and protoenstatite in the composites with 5 and 10 wt% of B2O3. Meanwhile, the composite SMB15h, in addition to quartz and protoenstatit, also contains a new phase, namely suanite (Mg2B2O5). In SMB204h, there are quartz and suanite.The phase compositions were determined using the Rietveld method from which thermal expansion coefficient values of 9.5-12 ppm °C-1 had been predicted. These results showed that natural-sand-based composites could fairly satisfy the required conditions of fuel-cell sealing materials.

scholarly journals Observation of the Main Natural Parameters Influencing the Formation of Gas Hydrates

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1803
Author(s):  
Alberto Maria Gambelli ◽  
Umberta Tinivella ◽  
Rita Giovannetti ◽  
Beatrice Castellani ◽  
Michela Giustiniani ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Marine Sediments ◽  
Inductively Coupled Plasma ◽  
Hydrate Formation ◽  
Silica Sand ◽  
Small Scale ◽  
Natural Sand ◽  
Inductively Coupled ◽  
Pure Silica ◽  
Plasma Mass Spectrometry

Chemical composition in seawater of marine sediments, as well as the physical properties and chemical composition of soils, influence the phase behavior of natural gas hydrate by disturbing the hydrogen bond network in the water-rich phase before hydrate formation. In this article, some marine sediments samples, collected in National Antarctic Museum in Trieste, were analyzed and properties such as pH, conductivity, salinity, and concentration of main elements of water present in the sediments are reported. The results, obtained by inductively coupled plasma-mass spectrometry (ICP-MS) and ion chromatography (IC) analysis, show that the more abundant cation is sodium and, present in smaller quantities, but not negligible, are calcium, potassium, and magnesium, while the more abundant anion is chloride and sulfate is also appreciable. These results were successively used to determine the thermodynamic parameters and the effect on salinity of water on hydrates’ formation. Then, hydrate formation was experimentally tested using a small-scale apparatus, in the presence of two different porous media: a pure silica sand and a silica-based natural sand, coming from the Mediterranean seafloor. The results proved how the presence of further compounds, rather than silicon, as well as the heterogeneous grainsize and porosity, made this sand a weak thermodynamic and a strong kinetic inhibitor for the hydrate formation process.

The Study on High Precision 3D Detection Method of Steel Plate Surface Based on Structured Light

2012 ◽  
Vol 572 ◽  
pp. 338-342 ◽  
Author(s):  
Zhi Guo Liang ◽  
Quan Yang ◽  
Ke Xu ◽  
Fei He ◽  
Xiao Chen Wang ◽  
...  
Keyword(s):  
Surface Quality ◽  
Steel Plate ◽  
Detection Method ◽  
Structured Light ◽  
Detection Methods ◽  
Measurement Technology ◽  
Detection Accuracy ◽  
Plate Surface ◽  
Factors Affecting

Structured light 3D measurement technology with its simple structure, non-contact measurement, fast measurement speed and other advantages, has been widely used. Steel plate surface quality detection is not confined to the two-dimensional feature of gray detection, and local topography measurement for surface quality of steel plate detection becomes increasingly important. In this paper, steel plate surface 3D detection method based on structured light and the factors affecting the measurement accuracy are analyzed. Several effective methods of improving 3D detection accuracy are put forward. Compared with the traditional structured light 3D detection methods, the detection accuracy of new methods is remarkably improved, thus possessing better application values.

Preparation and Structure of Oxide and Reduced Nd(Fe1-xCox)B Nanoparticles

2020 ◽  
Vol 312 ◽  
pp. 288-294
Author(s):  
Ghader Ahmadpour ◽  
Aleksey Yu. Samardak ◽  
Farzad Nasirpouri ◽  
A.S. Samardak ◽  
Alexey V. Ognev
Keyword(s):  
Chemical Synthesis ◽  
Permanent Magnets ◽  
Sol Gel ◽  
Synthesis Process ◽  
Bottom Up ◽  
Gel Method ◽  
Sol Gel Method ◽  
Co Concentrations

Nanoparticles of Nd(Fe1-xCox)B with Co concentrations ranging from x = 0 to 0.5 were prepared using a modified Pechini-type sol-gel method. We have shown the influence of Co on the morphology and size of nanoparticles, as well as on elements distribution in nanostructures. It was found that nanoparticles with increased content of Fe and Co were formed during the synthesis process. There was an interdiffusion of Nd and Fe, both after oxidation and after reduction. This study helped to define promising “bottom-up” approaches for the fabrication of nanomaterials for the advanced Nd(Fe1-xCox)B permanent magnets by chemical synthesis.

Toward Easily Enlarged Superhydrophobic Copper Surfaces with Enhanced Corrosion Resistance, Excellent Self-Cleaning and Anti-Icing Performance by a Facile Method

2020 ◽  
Vol 20 (10) ◽  
pp. 6317-6325 ◽  
Author(s):  
Xueting Shi ◽  
Libin Zhao ◽  
Jing Wang ◽  
Libang Feng
Keyword(s):  
Corrosion Resistance ◽  
Superhydrophobic Surface ◽  
Cost Effective ◽  
Copper Plate ◽  
Plate Surface ◽  
Water Contact ◽  
Copper Surfaces ◽  
Self Cleaning ◽  
Water Repellence

This work reports a facile method for fabricating superhydrophobic surface on copper plate by AgNO3 treatment and dodecyl mercaptan modification. The as-prepared superhydrophobic copper plate presents hierarchical and rough morphology composed of nanosheets and nanoparticleformed matrix. Meanwhile, long alkyl chains are assembled onto the rough surface successfully. Consequently, the copper plate is endowed with excellent superhydrophobic performance with a water contact angle of 156.8° and a rolling angle of ca. 3°. Moreover, the superhydrophobicity has long-term durability and excellent stability. Grounded on the strong water repellence, the resultant superhydrophobic copper plate surface exhibits multi-functions. The excellent performance can be well explained by “Cushion effect” and Capillary phenomena. As a result, water and corrosive species can be prevented from contacting with the copper plate surface, and contaminants can be taken away easily by the rolling water droplets. Meanwhile, the icing process of water is delayed on the superhydrophobic surface. Therefore, the superhydrophobic copper is endued with enhanced corrosion resistance, excellent self-cleaning and anti-icing performance. We believe that this facile method provides a simple and cost-effective process to improve the properties of copper plate, and which may see practical application of the superhydrophobic materials.

scholarly journals Noncontact Guide System for Traveling Continuous Steel Plate Using Electromagnet and Supplement of Permanent Magnets for Suppressing Vibration

Actuators ◽  
2018 ◽  
Vol 7 (3) ◽  
pp. 47 ◽  
Author(s):  
Takahiko Bessho ◽  
Sora Ishihara ◽  
Yasuhiro Narawa ◽  
Ryo Yamaguti ◽  
Takayoshi Narita ◽  
...  
Keyword(s):  
High Speed ◽  
Permanent Magnets ◽  
Steel Plate ◽  
Vertical Direction ◽  
Mode Analysis ◽  
Steady Current ◽  
Guide System ◽  
Current Value ◽  
Increase In Productivity ◽  
Stable Control

In a plating process, the steel plate is conveyed 20–50 m in the vertical direction for drying, during which it is negligibly supported by rollers and other mechanisms. This produces plating without uniformity owing to the generation of vibration and other factors, which prevent the increase in productivity. We have developed a noncontact guide system for a high-speed traveling elastic steel plate in which electromagnetic forces are applied by actuators at the edges of the plate to control the plate’s position. In this study, we investigated the vibration phenomenon when changing the steady current value of the electromagnet used for controlling the position. In addition, we conducted mode analysis of the steel plate to enable stable control even at low steady current values and verified whether stable guide can be provided by using it together with a permanent magnet. As a result, by arranging the permanent magnets, stable guidance was possible even at a low steady current value. In addition, it became clear that vibration damping performance is also improved.

scholarly journals Thermographic Monitoring of Laser Cutting Machine

Proceedings ◽  
2019 ◽  
Vol 27 (1) ◽  
pp. 28
Author(s):  
Paolo Bison ◽  
Giovanni Ferrarini ◽  
Gabriele Zanon
Keyword(s):  
Temperature Field ◽  
Analytical Solution ◽  
Laser Cutting ◽  
Energy Demand ◽  
Steel Plate ◽  
Cutting Tools ◽  
Plate Surface ◽  
Ir Camera ◽  
Cutting Machine ◽  
Contact Processing

Computer Numerical Controlled (CNC) laser cutting tools are developing as an alternative to conventional cutting systems thanks to increased accuracy, non-contact processing, higher productivity, less energy demand. An IR camera is utilized to monitor the laser cutting process of a steel plate. Even though the process is very complicated an analytical solution of the temperature field generated on a slab by a point source moving along one direction of the plate surface is provided in order to interpret the temperature field experimentally obtained by the IR camera.

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