Effect of CVD carbon coatings on properties of SiC fibres

Cao, Shiyi; Wang, J.; Wang, H.

doi:10.1080/02670844.2015.1123346

Cited by 9 publications

(5 citation statements)

References 23 publications

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“…Carbon coatings were prepared on SiC-3 fibers by chemical vapor deposition as reported elsewhere. 16 Annealing treatments were performed in a high-temperature carbon-resistant furnace. Fibers were charged into a graphite crucible and were heat-treated in argon at 10 5 Pa with a heating rate of 300 °C h −1 and held for 1 h at 1400 to 1800 °C.…”

Section: Materials and Heat Treatmentsmentioning

confidence: 99%

Formation mechanism of large SiC grains on SiC fiber surfaces during heat treatment

Cao

Wang

2016

CrystEngComm

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Three low oxygen-containing SiC fibers with different surface compositions were heat-treated at high temperature in argon, and large SiC particles were observed on the surfaces of SiC fibers with oxygen-containing surface layers. The SiC particles were identified as single crystal β-SiC. The growth process, formation mechanism of these large SiC grains and their influence on fiber strength were investigated. Nano-sized SiC particles were precipitated from the decomposition of SiC x O y in the fiber surface that acted as nuclei, and these nuclei grew gradually to form large grains because of the gaseous reaction of SiO and CO. The formation of large SiC grains was related closely to the SiC fiber surface composition, which affected SiC nucleation and SiO diffusion from the core to the fiber surface. The large grains influenced the fiber strength degradation significantly and should be avoided to retain high fiber strength.

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Section: Materials and Heat Treatmentsmentioning

confidence: 99%

Formation mechanism of large SiC grains on SiC fiber surfaces during heat treatment

Cao

Wang

2016

CrystEngComm

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“…For explaining the feasible incorporation mechanism of suspending TiC particles briefly, a schematic diagram is shown in Figure 8. Initially, suspending TiC particles are negatively charged and shift towards the anode (specimen) in the electric field (10 6 -10 8 V/m), owing to the cataphoretic effect (Yao et al, 2009;Besra and Liu., 2007;Cao et al, 2017). Then, the particles are mechanically deposited on the surface of porous ceramic coating and into the pores (Aand C-type) formed by the previous discharge [Figure 8(b)].…”

Section: Figure 3 Surface Morphologies Of Peo Coatings Formed On D16t Aluminum Alloy In Electrolytes With Different Concentration Of Tic mentioning

confidence: 99%

Titanium carbide’s effects on coatings formed on D16T aluminum alloy by plasma electrolytic oxidation

Liu

Yang

Qiu

et al. 2020

ACMM

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Purpose The preferable concentration of titanium carbide was optimized and added as an additive to the micro-arc oxidation electrolyte to produce a high corrosion-resistant coating on D16T aluminum alloy. Design/methodology/approach Ceramic coatings were deposited on D16T aluminum alloy by plasma electrolytic oxidation in alkaline silicate electrolytes with micron titanium carbide particle suspending at different concentrations. Influences of additive concentration on morphology, elemental and phase composition and corrosion resistance of doped PEO coatings were evaluated by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) and electrochemical methods, respectively. Findings Results revealed that suspending titanium carbide additives incorporated into ceramic coatings through discharging channels and chemically transformed into amorphous stage. The content of titanium in the doped coatings increased with the increasing concentration of suspending micron additive. Compared with the coating without particle addition, the corrosion resistance of the coating produced in 8 g/L titanium carbide suspension increased more than 20 times. The result indicated that the incorporation of titanium into the PEO coatings formed on the D16T aluminum alloy could effectively improve the corrosion resistance. Originality/value The mechanism of corporation of TiC and the mechanism of improving the corrosion resistance of the coating were proposed.

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“…By a mathematical geometry calculation for a semispherical embryo of radius r as in Figure 5b, this equation could be obtained (10) Combining Equation (6) to Equation (10), Equation (5) can be rewritten as…”

Section: Theoretical Analysismentioning

confidence: 99%

Fabrication and Frosting Properties Study of Surface-Active Agents Coating Based on Nanoporous Aluminum Substrate

Zhang

Yang

et al. 2018

Energies

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In order to solve the frosting and blockage problem of an air conditioning evaporator’s fin in winter, the nanoporous aluminum plates with low surface energy has been proposed in this paper, which are fabricated by an anodizing method and then modified by lauric acid. The nanoporous aluminum plates with different nanoporous diameters ranging from 15 nm to 400 nm are obtained by changing the magnitude of the oxidation current. The surface contact angle of the nanoporous aluminum plates is an important factor influencing its surface frost and condensation. The test results show that the surface contact angle is decreased with the increasing of nanoporous diameter. When the nanoporous aluminum plates are modified by lauric acid, the contact angle is proportional to the nanoporous diameter, and the maximum contact angle can reach about 171°. A set of experimental instruments has been set up to simulate the typical winter climate in northern China, and the frosting properties of the nanoporous aluminum plate’s fin is analyzed by experiment. The results show that increasing the contact angle of aluminum plates can effectively improve its anti-frosting properties. The average frosting rate of the aluminum plate with the contact angle of 60° is about 0.33 [g/(min∙m2)], which is 1.74 times that of the aluminum plate with the contact angle of 171°, whose frosting rate is about 0.19 [g/(min∙m2)]. After taking the expanded aperture processing to the aluminum plate, the diameter with 30 nm, 100 nm, 200 nm, 300 nm, and 400 nm nanoporous aluminum plates are obtained and the polished aluminum plates are also prepared for comparing. Through the test results, the nanoporous aluminum plates are shown to have anti-frosting properties, and the nanoporous aluminum plates with diameter of 300 nm are shown to have the best anti-frosting properties. The calculation mode of frosting growth is derived on the base of experimental results. This research will be helpful in indicating the potential research area of the low-carbon-emission and energy-saving technology for the researchers all over the world.

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Effect of CVD carbon coatings on properties of SiC fibres

Cited by 9 publications

References 23 publications

Formation mechanism of large SiC grains on SiC fiber surfaces during heat treatment

Formation mechanism of large SiC grains on SiC fiber surfaces during heat treatment

Titanium carbide’s effects on coatings formed on D16T aluminum alloy by plasma electrolytic oxidation

Fabrication and Frosting Properties Study of Surface-Active Agents Coating Based on Nanoporous Aluminum Substrate

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