scholarly journals A Review on Self-Cleaning Coatings for Tunnels

2022 ◽  
Vol 6 (1) ◽  
pp. 13-19
Author(s):  
Han Yu ◽  
Ang Zhan
Keyword(s):  
Fire Retardant ◽  
Exhaust Gas ◽  
Functional Coatings ◽  
Present Stage ◽  
Research Status ◽  
Advantages And Disadvantages ◽  
Development Direction ◽  
Self Cleaning ◽  
Poor Ventilation ◽  
Closed Environment

Self-cleaning coatings for tunnels can effectively remove dust and stains accumulated over the surface of tunnel linings and their appurtenances due to the closed environment and poor ventilation. This paper systematically introduces the current research status of self-cleaning coatings for tunnels, focusing on the development of super-hydrophobic self-cleaning coatings, superamphiphobic self-cleaning coatings, exhaust gas degradation coatings, fire retardant coatings, and tunnel de-icing coatings. The advantages and disadvantages of the five functional coatings are then briefly described, and the problems of self-cleaning coatings for tunnels at the present stage are pointed out. Finally, the development direction of self-cleaning coatings for tunnels is proposed to provide a reference for the research and application of self-cleaning coatings for tunnels.

Study on the Technology Development Status of Ballistic Identification

2013 ◽  
Vol 475-476 ◽  
pp. 72-74
Author(s):  
Xin Zhao ◽  
Jing Lv ◽  
Qiu Sheng Liu
Keyword(s):  
Technology Development ◽  
Present Stage ◽  
Accurate Identification ◽  
Development Status ◽  
Research Status ◽  
Development Direction ◽  
The Future ◽  
Working Principle ◽  
Modern Warfare

With the development of modern warfare, put forward higher requirements on the accuracy of the ammunition. Whether the precisely guided amunitions or ballistic correction ammunition, its working principle is derived from the accurate identification of the ballistic information. According to the research status of the present stage, the ballistic identification technology in the future is prospected, the development direction of this technology were discussed.

scholarly journals Current Research Status on Cold Sprayed Amorphous Alloy Coatings: A Review

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 206
Author(s):  
Qiang Wang ◽  
Peng Han ◽  
Shuo Yin ◽  
Wen-Juan Niu ◽  
Le Zhai ◽  
...  
Keyword(s):  
High Temperature ◽  
Amorphous Alloy ◽  
Amorphous Alloys ◽  
Composite Coatings ◽  
Thermal Spraying ◽  
Functional Coatings ◽  
Research Status ◽  
Key Issues ◽  
Wear And Corrosion Resistance ◽  
Amorphous Coatings

Compared with traditional crystalline materials, amorphous alloys have excellent corrosion and wear resistance and high elastic modulus, due to their unique short-range ordered and long-range disordered atomic arrangement as well as absence of defects, such as grain boundaries and dislocations. Owing to the limitation of the bulk size of amorphous alloys as structural materials, the application as functional coatings can widely extend their use in various engineering fields. This review first briefly introduces the problems involved during high temperature preparation processes of amorphous coatings, including laser cladding and thermal spraying. Cold spray (CS) is characterized by a low-temperature solid-state deposition, and thus the oxidation and crystallization related with a high temperature environment can be avoided during the formation of coatings. Therefore, CS has unique advantages in the preparation of fully amorphous alloy coatings. The research status of Fe-, Al-, Ni-, and Zr-based amorphous alloy coatings and amorphous composite coatings are reviewed. The influence of CS process parameters, and powders and substrate conditions on the microstructure, hardness, as well as wear and corrosion resistance of amorphous coatings is analyzed. Meanwhile, the deposition mechanism of amorphous alloy coatings is discussed by simulation and experiment. Finally, the key issues involved in the preparation of amorphous alloy coatings via CS technology are summarized, and the future development is also being prospected.

scholarly journals Progress in Vinyl Acetate

CONVERTER ◽  
2021 ◽  
pp. 861-867
Author(s):  
Heng Ma
Keyword(s):  
Vinyl Acetate ◽  
Synthesis Method ◽  
Raw Material ◽  
Organic Chemical ◽  
Synthesis Methods ◽  
Advantages And Disadvantages ◽  
Production Route ◽  
Film Adhesive ◽  
Development Direction ◽  
Adhesive Coating

Vinyl acetate is an organic chemical raw material of great industrial value. It is widely used in synthetic film, adhesive, coating and textile slurry. The production route of vinyl acetate is introduced, and the advantages and disadvantages of synthesis methods of vinyl acetate method, acetylene method, EDA cracking method, base synthesis method and Halcon method are compared. The method of carbide acetylene has high economic efficiency, low energy consumption and good environmental protection, proposing the development direction of ethylene acetate production technology.

scholarly journals Establishment, Description and Equivalence of Flax Fabric Reinforced and E-Glass Fabric Reinforced Polyester Based Composite

2020 ◽  
Vol 10 (1) ◽  
pp. 152-158
Keyword(s):  
Glass Fibre ◽  
Mechanical Test ◽  
Renewable Energy Sources ◽  
Fire Retardant ◽  
Natural Fibre ◽  
Sem Analysis ◽  
Fibre Strength ◽  
Flame Resistance ◽  
Advantages And Disadvantages ◽  
Naoh Solution

Every fabric can be categorized as either synthetic or natural fibre. Both natural and synthetic fibre have both advantages and disadvantages. Natural fibres are extracted from various plants and animals’ sources, while synthetic fibres are made from chemical compounds which requires enormous amount of non- renewable energy sources. Comparing with the flax fabric, glass fibre mats are made from silica (SiO2) sand, which melts at 1720°C/3128°F. Glass fibre mat requires burning enormous of fossil fuel for producing heat, whereas flax fabric is extracted from the bast or the skin of linseed plant that grow inside stalks of the plants. Flax fabric is hydrophilic in nature, which by the mercerization process is converted to hydrophobic in nature. In Mercerization process fabric is treated with a caustic soda (NaOH) solution in water to improve properties such as fibre strength, shrink- age resistance, lustre, and dye affinity. The composites manufacturing process known as Hand layup involves laying down individual reinforced fabric of glass and flax separately and then wet with isophthalic resin (mixed with 2% of charcoal) by measuring the quantity by weighing. Scanning Electron Microscopy (SEM) analysis, provides evaluating of glass and flax reinforced composites for surface fractures, flaws, contaminants or corrosion. In order to check the flame resistance fire retardant test is done. Furthermore, mechanical test result showed the comparative values of tensile, impact and flexural strength of both the composites.

Research Profiling of Soil Pollution from 2000 to 2013

2014 ◽  
Vol 955-959 ◽  
pp. 3665-3670
Author(s):  
Li Ying Zhou ◽  
Wen Ge Zuo ◽  
Zhi Mei Li ◽  
Chang Shou Luo
Keyword(s):  
Soil Pollution ◽  
Research Papers ◽  
Related Field ◽  
Policy Makers ◽  
Related Research ◽  
Research Status ◽  
Research Institutes ◽  
Development Direction

In order to profile the research status of soil pollution, and grasp the development direction of the disciplines, based on the soil pollution related research papers included in EI compendex, by the controlled terms of EI thesaurus, we used words co-occurrence clustering to identify the current six subfields of international soil pollution studies, investigated the development and change of them with time case, and pointed out the journals that different subfields should focus on by analyzing the relevant periodicals distribution, to provide reference for the research institutes, researchers, and policy makers in soil pollution related field.

Research Status of Concrete Strength Theory Based on Stress and Strain

2014 ◽  
Vol 670-671 ◽  
pp. 445-448
Author(s):  
Guo Jun Liu
Keyword(s):  
Failure Criterion ◽  
Concrete Strength ◽  
Failure Criteria ◽  
Practical Significance ◽  
Engineering Structures ◽  
Research Status ◽  
Advantages And Disadvantages ◽  
Strength Failure ◽  
Micro Cracks ◽  
Strain Space

In the civil engineering structures, when concrete structure withstand external loads, internal defects such as micro-cracks gradually developed, eventually will lead to the destruction of the concrete. Currently, there are two types of strength failure criterion of concrete, strength failure criterion based on stress-space and strength failure criterion based on strain-space, both of which have advantages and disadvantages, this paper introduces the research status of the two strength failure criteria of concrete, and the problems need further study in the future. It plays a strong practical significance in scientific research.

Progress of High Purity Magnesium Oxide Preparation

2014 ◽  
Vol 525 ◽  
pp. 62-65 ◽  
Author(s):  
Bi Jun Luo ◽  
Dan Wu ◽  
Li Cong Wang ◽  
Xi Ping Huang
Keyword(s):  
Magnesium Oxide ◽  
High Purity ◽  
Preparation Method ◽  
Preparation Methods ◽  
Domestic Production ◽  
Research Status ◽  
Development Direction

The research status of high purity magnesium oxide preparation is introduced in this paper. First, process for preparing high purity MgO is summarized, the global and domestic production status of high purity magnesia is also described. Finally, the problems and disadvantages of current MgO preparation methods are concluded, also development direction of preparation method basing on brine utilization in the production of MgO is put forward.

Research Status and Development Trend of Electromagnetic Defect Detection Logging

2013 ◽  
Vol 325-326 ◽  
pp. 856-860
Author(s):  
Zheng Guo Yan ◽  
Lin Zhao
Keyword(s):  
Defect Detection ◽  
Hot Spot ◽  
Development Trend ◽  
Research Status ◽  
Advantages And Disadvantages ◽  
Detection Technology ◽  
Metal Thickness ◽  
Theory Research ◽  
The Development Trend

Electromagnetic defect detection logging can measure multilayer pipeline and provide the information of casing defect and the remaining metal thickness, is the hot spot of the casing defect detection technology. This paper elaborates the advantages and disadvantages of electromagnetic defect detection logging and the present instrument situation, compares technical indexes of several new electromagnetic casing defect detection instruments, summarizes the latest research status, points out the problems existed in current researches and the development trend combining with the instrument index and theory research.

Functional coatings formed on the titanium and magnesium alloys as implant materials by plasma electrolytic oxidation technology: fundamental principles and synthesis conditions

2016 ◽  
Vol 34 (1-2) ◽  
pp. 65-83 ◽  
Author(s):  
Sergey Vasilievich Gnedenkov ◽  
Yurii Petrovich Sharkeev ◽  
Sergey Leonidovich Sinebryukhov ◽  
Olga Alekseevna Khrisanfova ◽  
Elena Viktorovna Legostaeva ◽  
...  
Keyword(s):  
Surface Modification ◽  
Plasma Electrolytic Oxidation ◽  
Polymer Materials ◽  
Functional Coatings ◽  
Average Life Span ◽  
Advantages And Disadvantages ◽  
Metallic Implants ◽  
Electrolytic Oxidation ◽  
Oxidation Technology ◽  
Plasma Electrolytic

AbstractMetallic implants have been successfully used in medicine for the past 60–70 years. Historically, implants were designed only as mechanical devices, whereas the biological aspects of their application were beyond the researchers’ interest. The improvement of living conditions and the increase of the average life span have changed the situation. The clinical requirements for medical implants rise up substantially. Presently, it seems impossible to imagine the use of metallic implants in the human body without preliminary surface modification to modulate the interaction between the surrounding biological environment and the implant. The review highlights the most recent advances in the field of functional coatings formed on implants by the plasma electrolytic oxidation technology. Special attention is dedicated to the principles of surface modification of the commercially pure titanium, titanium nickelide, and Mg-Mn-Ce magnesium alloy. The advantages and disadvantages of the method and the characteristics of these materials are discussed from this point of view. Some aspects of this review are aimed at corrosion protection of implants with application of polymer materials.

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