performance optimization of sol derived c mullite
The effects of pre-heating and sintering temperature on
Aug 21 2019 · Mullite is an aluminosilicate (3Al 2 O 3.2SiO 2) ceramic material that is attracting widespread applications owing to its physical and chemical properties.The main characteristics of mullite are high mechanical properties high creep resistance at elevated temperatures low thermal expansion (4.5 10 −6 °C −1) good chemical stability low thermal conductivity (6 10 −2 W cm −1 K
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Performance Improvement of Li Ion Battery with Non
Apr 08 2014 · The term C sol tot means the total molar concentration of the solvent. From the peak intensity in the Raman spectra each solvation number of TMP ( N TMP ave ) EC ( N EC ave ) and DEC ( N DEC ave ) bonding to lithium ions was estimated as 2.2 1.1 and 1.3 respectively in 1.0 M LiPF 6 electrolyte including 40 vol TMP.
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Weiguo MAO Professor (Full) PhD Changsha University
Three-dimensional carbon fiber preform reinforced mullite (C/Mullite) composites have been prepared through the sol-impregnation-drying-heating route in our previous studies. To further optimize
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Electrically Conductive and Mechanically Strong Graphene
Ceramic composites with good electrical conductivity and high strength that can provide electromagnetic interference (EMI) shielding are highly desirable for the applications in harsh environment. In this study lightweight highly conductive and strong mullite composites incorporated with reduced graphene oxide (rGO) are successfully fabricated by spark plasma sintering at merely 1200 °C
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Electrochemical Performance Optimization of Li2NixFe1
May 09 2017 · It was observed that Li/Li 2 Ni 0.4 Fe 0.6 SiO 4 battery has initial discharge capacity of 164 mAh g −1 at 0.1 C rate. The cycle life performance of all Li 2 Ni x Fe 1− x SiO 4 batteries was ranged between 100 and 156 mAh g −1 with coulombic efficiency range between 70.9 and 93.9 .
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Performance optimization of a photovoltaic solar cell
Performance optimization of a photovoltaic solar cell-based hybrid system efficiency of the PV array TRECs and hybrid system are derived. The influences of the voltage output of the PV array the electric current of TRECs the solar irradiation and the numbers of TRECs on the efficiency of the hybrid system are discussed in detail
Chat OnlineSTUDY OF DENSIFICATION OF SOL-GEL DERIVED MULLITE
Study of densification of sol-gel derived mullite due to excess iron nickel and copper ions CeramicsSilikáty 57 (3) (2013) 221 b) Ni (1100°C) b) Ni (1400°C) a) Fe (1100°C) a) Fe (1400°C) c) Cu (1100°C) c) Cu (1400°C) Figure 1. X-ray diffraction pattern of mullite precursor gels
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Methylcellulose strengthened polyimide aerogels with
Jul 01 2020 · Polyimide (PI) aerogels have great potential in oil/water separation field but the extreme volume shrinkage during the fabrication still remains challenging. Herein a simple yet efficient strategy of incorporating methylcellulose (MC) in PI aerogels is proposed. The MC/PI composite aerogels were fabricated by freeze-drying plus thermal imidization with subsequent trimethylchlorosilane (TMCS
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A novel low-temperature strategy for synthesis of alumina
Oct 11 2016 · A novel method which involves the coating of the inactive Al2O3 microspheres with silica sol is employed to decrease the sintering temperature for preparing porous alumina ceramics and the influences of coating thickness and sintering conditions are discussed. The results show that the mullite necks among packed Al2O3 spheres are formed with the help of colloidal coatings at 1550 °C and
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A Review on Synthesis of Mullite Ceramics from Industrial
The CTE values of mullite ceramics produced from industrial wastes which ranged from 5.6 to 6.1 10 −6 °C −1 were slightly higher than those reported for mullite ceramics produced from minerals which ranged from 5.0 to 5.7 10 −6 °C −1 as well as to that of commercial mullite which is 5.5 10 −6 °C −1. Finally the
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Fabrication and oxidation resistance of mullite/yttrium
inner SiC coating was replaced by mullite coating derived from Al2O3–SiO2 sol 20 and mullite/Y2Si2O7 double-layer coating with desirable anti-oxidation performance and thermal shock resistance has been obtained 21 . However some pores and microcracks were still formed due to the intrinsic characteristics of sol–gel and slurry method.
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Effects of different kinds of sillimanite minerals on the
Jan 06 2020 · Then the as-prepared mullite preforms were immersed into infiltration slurry and a vacuum of 0.5Pa was applied for 10 min. The mullite preforms were dried at 100 °C for 24h and heated at different temperature(1325 °C 1400°C 1475 °C and 1550 °C) to obtain mullite ceramic foams.
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Effects of different kinds of sillimanite minerals on the
Jan 06 2020 · Then the as-prepared mullite preforms were immersed into infiltration slurry and a vacuum of 0.5Pa was applied for 10 min. The mullite preforms were dried at 100 °C for 24h and heated at different temperature(1325 °C 1400°C 1475 °C and 1550 °C) to obtain mullite ceramic foams.
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Inverse Design of Dielectric Resonator Cloaking Based on
derived by the adjoint analysis. The gradient information is used to determine the evolution direction of the design vari-able. The adjoint analysis-derived gradient for the quotient in Eq. 7 is δq = δ Es Er − Es 2 Er δ Er (8) In Eq. 8 δ Es is the first-order variational of Es δ Es =− d γ˜ δγ d (9) with γ˜f derived
Chat OnlineFabrication and oxidation resistance of mullite/yttrium
inner SiC coating was replaced by mullite coating derived from Al2O3–SiO2 sol 20 and mullite/Y2Si2O7 double-layer coating with desirable anti-oxidation performance and thermal shock resistance has been obtained 21 . However some pores and microcracks were still formed due to the intrinsic characteristics of sol–gel and slurry method.
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The Preparation and Properties of Clay Bonded Silicon
In this paper clay bonded silicon carbide was prepared through pressureless sintering process with silicon carbide dusting powder as raw materials and clay as sintering additive. The effects of the ball-milling method sintering temperature and clay contents on the density microstructure and mechanical properties of clay bonded silicon carbide refractory were studied.
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Membranes Free Full-Text Materials and Applications
In water treatment applications the use of ceramic membranes is associated with numerous advantages relative to polymer-based filtration systems. High-temperature stability fouling resistance and low maintenance requirements contribute to lower lifecycle costs in such systems. However the high production costs of most commercially available ceramic membranes stemming from raw materials
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Topology Optimisation Using the Level Set Method
For the first optimization we consider Load case 1 "pull-out after gliding flight . The topology optimization classes are presented in Fig. 41. With unchanged volume the complementary energy "as a measure of mean compliance could be reduced from 61818.5 Nmm "class 1 to 60697.6 Nmm "class 3 . LC 2 "tank pressure is treated in a second
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Effect of mullite synthesis methods on the spark plasma
The powders synthesised with sol–gel and direct reaction methods were used to fabricate monolithic mullite bodies with SPS method. Fig. 2 shows the variation of sintering temperature against time in both spark plasma sintered samples. As observed the SPS process was performed at a heating rate of (50°C/min) with 4 min holding time at 1400°C for both samples.
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Study on Preparation of Mullite Powder Using Fly Ash by
1 Amutharani D Gnanam F D Low temperature pressureless sintering of sol-gel derived mullite. Materials Science and Engineering A Structural Materials Properties Microstructure and Processing 1999 264(1) 254. DOI 10.1016/s(98)
Chat OnlineOptimization of process variables and corrosion properties
Jul 22 2011 · The dependent variables included the corrosion current derived from the polarisation curve (icor = Y1) and the coating resistance derived from the Nyquist curve (Rcoat = Y2). Optimizations were predicted to yield Y1 and Y2 values of 1.57018E–7A cm−2 and 14279 Ω cm2 when X1 X2 and X3 were 3.36 1.52 and 222 respectively.
Chat OnlineToughening Mechanism of Mullite Matrix Composites A Review
Mullite has high creep resistance low thermal expansion coefficient and thermal conductivity excellent corrosion resistance and thermal shock resistance and plays an important role in traditional ceramics and advanced ceramic materials. However the poor mechanical properties of mullite at room temperature limit its application. In order to improve the strength and toughness of mullite the
Chat OnlineTensile Strength and Bonding Mechanism of the Mullite
The aluminum phosphate adhesive was prepared by aluminum dihydrogen phosphate and ceramic fillers. The mullite silica and silicon powders were added as the fillers to improve the mechanical property and high temperature property. The specimens were prepared by joining the mullite ceramic/ceramic by phosphate adhesive. The strengths of the specimens treated at different temperatures were studied.
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Performance optimization of sol-derived C/Mullite
May 01 2020 · Performance optimization of sol-derived C/Mullite composites by introducing a PyC-SiC double-layer interfacial coating 1. Introduction. As one of the most promising oxide ceramics mullite ceramic has low density and thermal expansion 2. Experimental. The
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Electrochemical Performance Optimization of Li2NixFe1
May 09 2017 · It was observed that Li/Li 2 Ni 0.4 Fe 0.6 SiO 4 battery has initial discharge capacity of 164 mAh g −1 at 0.1 C rate. The cycle life performance of all Li 2 Ni x Fe 1− x SiO 4 batteries was ranged between 100 and 156 mAh g −1 with coulombic efficiency range between 70.9 and 93.9 .
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Mullite‐Type Structures in the Systems Al2O3–Me2O (Me = Na
A morphous solids belonging to the systems Al 2 O 3 –Me 2 O (Me = Na K) and Al 2 O 3 –B 2 O 3 were prepared by nitrate decomposition introducing boron in the form of boric acid. Crystalline metastable solids with pseudotetragonal symmetry were obtained from thermal treatment at 850° to 900°C for the compositions Al 6 Me x O (9 0.5x) (x≅ 1 Me = Na K) and Al 6‐x B x O 9 (1 x 3).
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Microstructure and properties evolution of C/Mullite
Mar 01 2021 · Performance optimization of sol-derived C/Mullite composites by introducing a PyC-SiC double-layer interfacial coating Ceram. Int. 46 ( 2020 ) pp.
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The Preparation and Properties of Clay Bonded Silicon
In this paper clay bonded silicon carbide was prepared through pressureless sintering process with silicon carbide dusting powder as raw materials and clay as sintering additive. The effects of the ball-milling method sintering temperature and clay contents on the density microstructure and mechanical properties of clay bonded silicon carbide refractory were studied.
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Preparation and Modification of Mullite Whiskers
Mullite whisker/cordierite porous ceramic activation process a certain amount of mullite whiskers/cordierite porous ceramic was put in 2.5 mol·L –1 hydrochloric acid with a solid–liquid ratio of 1 10 in a 90 °C water bath for 2 h. Subsequently the remaining hydrochloric acid from mullite whiskers/cordierite porous ceramic was removed
Chat OnlineDevelopment and Properties of New Mullite Based Refractory
The presented study is focused on optimization and characterization of a high-alumina refractory aggregate based on natural raw materials—kaolins claystone and mullite dust by-product (used to increase the alumina and mullite contents respectively). In total four individual formulas with the Al2O3 contents between 45 and 50 wt. were designed the samples were subsequently fired both in
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