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Online since: June 2020
Authors: Yang Xu, Tao Lei, Xi Sheng Yang, Che Chang, Lin Feng Qian, Qian Gong
Microstructure Evolution of the as Tempered P92 Steel at High Temperature Exposure Yang Xu1,2,a, Tao Lei1, Yang Xisheng1, Che Chang1, Qian Linfeng1,3,b,*, Qian Gong1,c,* 1China Special Equipment Inspection and Research Institute, Beijing, 100029, China 2School of Chemistry, Beihang University, Beijing, 100191, China 3School of Aeronautic Science and Engineering, Beihang University, Beijing, 100191, China a592782553@qq.com, bqlfhit@sina.com, cglbqian@163.com Keywords: P92 steel, thermal aging, microstructure evolution.
As shown in Fig. 2(b), after aging for 10 h, the tempered martensitic lath structure can still be observed clearly, indicating that the microstructure does not change much during this short period.
The as-tempered P92 steel exhibits a fine martensitic structure with high dislocation density, with a martensitic lath width of about 0.5 μm, as shown in Fig. 3(a).
Instead, the broadening of the lath structure is dominated by the motion mechanism of the “Y” type lath boundary.
Online since: March 2022
Authors: Kim S. Siow, Wai Kuan Ho, Anuttam Patra, Mohd Farhanulhakim Mohd Razip Wee, Naeem Ahmed
Hydrophilization improves capillary filling of polymer microfluidic channels and structured substrates, as most polymers are either hydrophobic or only slightly hydrophilic in their natural state [2, 3].
However, such plasma hydrophilization may not be permanent as demonstrated in synthetic polymeric substrate, because of their similarities in molecular structures of their monomers-polymer.
Others used a low-pressure Ar plasma discharge to modify the seed surface of safflower (Carthamus tinctorius L.) seeds to achieve similar physical structure alteration of the seed coat [10].
That can affect the interfacial chemistry and characteristics of plasma-treated polymers in response to interfacial energy variances between the plasma polymer and its surroundings.
Online since: June 2008
Authors: Xiao Peng Li, Bang Chun Wen, Zhao Hui Ren, Wei Sun, C.F. Li
The generalized quality of product is composed of all the demands of consumer, company and society for product quality, namely, the whole functions and performances (Structure performance, Working performance and Craftwork performance) [10-12].
Products detailed design To realize the F and C requirement Function domain Craft domain Figure 1 Harmonious relationship between design process and design methods Generalized Quality of Modern Mechanical Product Main and assistant function + synthesized performance Quality, Cost, Time, Environment, Service Main function: to alter the expression form of the geometry, physics, chemistry, and biological configuration or information of the substance Assistant function: transportation and holding of substance, movement form and energy inputting, instruction, collection, disposal and display of information Applicable work mechanism, running system, product structure, craft parameter, geometry parameter, movement parameter and dynamical parameter, and adjustable parameter system Structural Performance Working Performance Craft Performance Securities of human & machine Reliability of system Working durability Adaptability of material Fixedness of
Artistry of structure Standardization of machine Timeliness of produce Rationality of tolerance Convenience of maintenance Feasibility of conveyance Recycle of scrap Economic manufacturing Figure 2 Harmony of functions with performances Harmonious of Product with Product.
Online since: April 2016
Authors: De Tao Liu, Fan Cheng, Yu Hao Jiang, Jin Bo Chen, Peng Bo Lu, Ling Feng Su, Fan Zhe Yu
Introduction Sustainability, industrial ecology, eco-efficiency, and green chemistry are directing the development of the next generation of materials, products, and processes.
When no resin is applied, the bonding between wood fibers is significantly influenced by compacting fibrous mat into a tight structure.
Table 1 Experimental arrangement for trials Items Density [kg/m3] Steam pressure [Kgf/cm2] Injection time [s] Holding time [min] Fiber sieving size [mm] Formation effective 1 80 1.5 10 30 10×10 Level-4 2 80 3 10 30 10×10 Level-4 3 80 5 10 30 10×10 Level-4 4 80 7 10 30 10×10 Level-4 5 80 7 3 30 10×10 Level-4 6 80 7 5 30 10×10 Level-4 7 80 7 20 30 10×10 Level-4 8 80 7 40 30 10×10 Level-4 9 80 7 60 30 10×10 Level-3 10 80 7 10 1 10×10 Level-1 11 80 7 10 3 10×10 Level-2 12 80 7 10 5 10×10 Level-3 13 80 7 10 7 10×10 Level-3 14 80 7 10 10 10×10 Level-3 15 80 7 10 15 10×10 Level-4 16 80 7 10 13 10×10 Level-3 17 80 7 10 14 10×10 Level-3 18 80 7 10 30 - Level-2 19 80 7 10 30 5×5 Level-4 20 80 7 10 30 0.9×0.9 Level-1 21 70 7 10 30 10×10 Level-4 22 60 7 10 30 10×10 Level-4 23 50 7 10 30 10×10 Level-1 24 45 7 10 30 10×10 Level-1 Bonding in binderless structure.
The self- bonding in binderless structure was significantly completed by the changes in chemical composition of the wood fibers caused by the steam/ heat injection.
Online since: January 2013
Authors: Ying Xiang Jiang, Gui Zhen Li, Zhi Lin Li
Material choice of rotating seal joint of the device yellow phosphorus extraction from phosphorus sludge at moderate temperature Zhilin Li 1, a, Yingxiang Jiang 2, b and Guizhen Li 3, c 1 Kunming University of science and technology, Kunming, Yunnan, 650093, China 2 Kunming University of science and technology, Kunming, Yunnan, 650093, China 3 Faculty of Chemistry and Biotechnology, Yunnan University of Nationalities, Kunming 650031, China a605486532@qq.com, b512400943@qq.com, cjiangnanfengyu@126.com Keywords: Moderate temperature, Yellow phosphorus, Rotating seal joint, Material choice.
The main parts of rotary sealing joint include axis of rotation,bearing,rotating shell,static ring,carbon graphite friction pair,movable ring,spring,filler and gland,structure diagram of rotary sealing joint is shown in Fig.3.The sealing method of rotary sealing joint is mainly mechanical rotating seal and packing seal as secondary seal.
Fig.3 Structure diagram of rotary sealing joint [5] Material choice of axis of rotation rotating shell.
The mechanical properties of Q235A steel[6] grade Yield strength Reh/(N/mm2),≥ Tensile Strength Rm/ (N/mm2) elongation after fracture A/%,≥ thickness(or diameter)/mm thickness(or diameter)/mm ≤16 >16 ~40 >40 ~60 >60 ~100 >100 ~150 >150 ~200 ≤40 >40 ~60 >60 ~100 >100 ~150 >150 ~200 Q235A 235 225 215 215 195 185 370~500 26 25 24 22 21 From the above two tables we can see that Q235A steel has a certain strength, abrasion resistance, good plasticity, which is widely used in the parts of general metal structure and also make low atress shaft, mandrel,pull rod,rocker and bolts.
Online since: February 2018
Authors: Janis Švirksts, Anna Trubača-Boginska, Guntars Vaivars, Rūta Ādiņa
A Study on Acidification and Intercalation of Illite Clay Minerals and their Potential Use as a Filler in SPEEK Composite Membranes Anna Trubača-Boginskaa*, Rūta Ādiņab, Guntars Vaivarsc, Jānis Švirkstsd University of Latvia, Faculty of Chemistry, Jelgavas 1, Riga, LV-1004, Latvia aanna.trubaca-boginska@lu.lv, bruta.adina@lu.lv, cguntars.vaivars@lu.lv, djanis.svirksts@lu.lv Keywords: illite, acidification, intercalation, SPEEK, composite, membranes Abstract.
One of the most promising ways of producing energy is proton exchange membrane fuel cells (PEMFCs), where chemical energy of hydrogen fuel is directly converted into electrical energy and heat [1], the overall reaction shown in the following equation (Eq. 1) [2]: (1) The main advantages of PEMFCs, compared to fossil fuels, are higher efficiency (60-80%), production of nearly zero pollution, low operating temperature (50-100 ºC), high power density and simple structure, while the main disadvantages are their expensive cost, low durability and the high cost of hydrogen fuel [3-5].
Although illite clay mineral has the same basic structure as MMT clay, its intercalation and exfoliation are difficult due to potassium ions in illite clay mineral interlayer space.
Singh, Preparation of intercalated polyaniline/clay nanocomposite and its exfoliation exhibiting dendritic structure, Bull.
Online since: November 2013
Authors: Mohamad Rusop Mahmood, Mohamad Hafiz Mamat, Mohd Zainizan Sahdan, Musa Mohamed Zaihidi, Mohd Firdaus Malek, Zuraida Khusaimi
They are: (1) the chemistry of the sol-gel method, (2) the interaction between the film and the substrate during the coating process, and (3) post-heat treatment.
All the samples in this study have undergone this procedure for five time altogether, therefore, leading to an initial five layer film structure.
From the observation that has been executed, all of the deposited films are polycrystalline and give the diffraction peak matching to the standard diffraction pattern of hexagonal wurtzite ZnO structure (JCPDS #36-1451).
The transmittance increases with the preferred c-axis orientation, consistent with a reduction in light dispersion in grain boundaries as the film structure becomes more c-axis oriented [17].
Online since: September 2018
Authors: I.V. Lukiyanchuk, Vladimir S. Rudnev, A.A. Zvereva, Marina S. Vasilyeva
Thermally Stimulated Transformation of the Surface Nanoarchitecture of Ni-and Cu-Doped Oxide Coatings on Titanium RUDNEV V.S.1,2,a*, LUKIYANCHUK I.V.1,b, VASILYEVA M.S.1,2,c and ZVEREVA A.A.1,d 1Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences, 159 pr. 100-letiya Vladivostoka, Vladivostok, 690022, Russia 2Far Eastern Federal University, 8 Sukhanova St, Vladivostok, 690950, Russia arudnevvs@ich.dvo.ru, blukiyanchuk@ich.dvo.ru, cmarina_x@mail.ru, dzverechok@mail.ru Keywords: Titanium, Plasma Electrolytic Oxidation, Impregnation, Air Annealing, Coatings, Surface Architecture, Micro- and Nanoformations.
Micro- and nanoformations on the surfaces of the coated samples annealed for 4 h at the temperatures of 700 (a), 750 (b), 800 (c), 850°C (d) and for 1 h at 900 оC(e) Correlation between the surface structure and catalytic activity in CO oxidation.
All annealed coatings have a layered structure: a layer of nanocrystals is located on the main matrix of a dense oxide coating, the composition of which is determined by the annealing temperature.
Kuryavyi, Composition, surface structure, and thermal behavior of ZrO2 + TiO2/Ti and ZrO2 + CeOx + TiO2 composites formed by plasma-electrolytic oxidation, Prot.
Online since: January 2017
Authors: Alexey G. Tkachev, Irina V. Anosova, Natalia V. Orlova, Tatyana P. Dyachkova, Evgeny V. Galunin
As on the TEM images of this material (Fig. 2), the structure of the modifying layer is loose, with surface in homogeneities and protrusions.
The explanation for this effect of the carboxyl groups on the modifying layer structure can be obtained through implementing molecular dynamics methods [21].
All these factors must affect the pattern of the oxidative polymerization of aniline and the structure of the modifying coating being formed.
Boehm, Some aspects of the surface chemistry of carbon blacks and other carbons, Carbon 32 (1994) 759-769
Online since: November 2023
Authors: Isik Cetintav, Mehmet Ceviz
This improvement in stiffness can be attributed to the greater surface area of the filler incorporated into the structure.
The PA66/WC/Co-Cr 86/10-4 composites exhibited a smooth transition with a shoulder peak at 255°C during melting, indicating that the presence of WC/Co-Cr 86/10-4 powders hindered the formation of the crystal structure in PA66.
Ding, Sandwich structured polyamide-6/polyacrylonitrile nanonets/bead-on-string composite membrane for effective air filtration, Sep.
Okan, Scalable fabrication of high-performance graphene/polyamide 66 nanocomposites with controllable surface chemistry by melt compounding, J.