scholarly journals Oxidation Resistance of Double-Layer MoSi2–Borosilicate Glass Coating on Fiber-Reinforced C/SiO2 Aerogel Composite

2021 ◽  
Vol 8 ◽  
Author(s):  
Tao Dai ◽  
Zihao Song ◽  
Yuxuan Du ◽  
Yifan Zhao ◽  
Sheng Cui
Keyword(s):  
Oxidation Resistance ◽  
Borosilicate Glass ◽  
Thermal Protection ◽  
Isothermal Oxidation ◽  
Glass Coating ◽  
Fiber Reinforced ◽  
Aerogel Composite ◽  
Before And After ◽  
Static Oxidation ◽  
Slurry Method

An MoSi2–borosilicate glass coating with high emissivity and oxidation resistance was prepared on the surface of the fiber-reinforced C/SiO2 aerogel composite by the slurry method combined with the embedding sintering method under the micro-oxygen atmosphere. The microstructure and phase composition of the coatings with different MoSi2 contents before and after static oxidation were investigated. This composite material has both excellent radiating properties and outstanding oxidation resistance. The total emissivity values of the as-prepared coatings are all above 0.8450 in the wavelength of 300∼2,500 nm. Meanwhile, the as-prepared M40 coating also has superior thermal endurance after the isothermal oxidation of 1,200°C for 180 min with only 0.27% weight loss, which contributes to the appropriate viscosity of the binder to relieve thermal stress defects. This material has broad application prospects in thermal protection.

scholarly journals Preparation and anti-oxidation performance of Al2O3-containing TaSi2–MoSi2–borosilicate glass coating on porous SiCO ceramic composites for thermal protection

RSC Advances ◽  
2018 ◽  
Vol 8 (24) ◽  
pp. 13178-13185 ◽  
Author(s):  
Xiafei Li ◽  
Junzong Feng ◽  
Yonggang Jiang ◽  
Hao Lin ◽  
Jian Feng
Keyword(s):  
High Temperature ◽  
Oxidation Resistance ◽  
Borosilicate Glass ◽  
Thermal Protection ◽  
Ceramic Composites ◽  
Glass Coating ◽  
Oxidation Performance ◽  
Gas Penetration

Al2O3 improves the oxidation resistance of TaSi2–MoSi2–borosilicate glass coating through increasing the viscosity and inhibiting gas penetration into matrix at high temperature, thus prevents porous SiCO ceramic composites from being oxidized.

Preparation and properties of TaSi2-MoSi2-ZrO2-borosilicate glass coating on porous SiCO ceramic composites for thermal protection

2018 ◽  
Vol 44 (16) ◽  
pp. 19143-19150 ◽  
Author(s):  
Xiafei Li ◽  
Junzong Feng ◽  
Yonggang Jiang ◽  
Hao Lin ◽  
Jian Feng
Keyword(s):  
Borosilicate Glass ◽  
Thermal Protection ◽  
Ceramic Composites ◽  
Glass Coating

Preparation and Oxidation Properties of Carbon/Carbon Composites with the Antioxidant SiC/NiCS Coating

2017 ◽  
Vol 727 ◽  
pp. 881-888
Author(s):  
Yi Li ◽  
Fan Hao Zeng ◽  
Ji An Liu ◽  
Zhi Huan Zou ◽  
Yi Gu
Keyword(s):  
Oxidation Resistance ◽  
Transition Layer ◽  
Bending Strength ◽  
Retention Rate ◽  
Isothermal Oxidation ◽  
Carbon Composites ◽  
Before And After ◽  
Oxidation Properties ◽  
Short Time ◽  
Strength Retention

In the paper, the SiC/NiCS coating on carbon/carbon composites was designed and prepared, and its oxidation properties was investigated. The SiC transition layer is prepared by embedding method while the NiCS coating by brushing slurry. Oxidation resistance of various coatings and the same coating sintered by different ways are analyzed through the isothermal oxidation experiment. The strength retention of the samples after oxidation is tested through the three-point bending experiment. The surface and cross section morphology of the coating before and after oxidation are observed by SEM, and crystalline phases of the coating are analyzed by XRD. According to the results, the coating have excellent short-time oxidation resistance, and the weightless rate with oxidation time presents linear increasing trend basically. With the increase of temperature, the weight-loss rate increases. The more serious oxidation is, the lower bending strength retention rate is. The integrity and density of the barrier layer and the across-running cracks of the silicon carbide transition layer are the main factors influencing the oxidation resistance of the sample.

Ultra-High Temperature Ceramics (UHTCs) via Reactive Sintering

2007 ◽  
Vol 336-338 ◽  
pp. 1159-1163 ◽  
Author(s):  
Guo Jun Zhang ◽  
Wen Wen Wu ◽  
Yan Mei Kan ◽  
Pei Ling Wang
Keyword(s):  
Phase Composition ◽  
High Temperature ◽  
Oxidation Resistance ◽  
High Performance ◽  
Thermal Protection ◽  
Ambient Pressure ◽  
Stable Phase ◽  
Reactive Sintering ◽  
Dissociation Temperature ◽  
Monolithic Ceramics

Current high temperature ceramics, such as ZrO2, Si3N4 and SiC, cannot be used at temperatures over 1600°C due to their low melting temperature or dissociation temperature. For ultrahigh temperature applications over 1800°C, materials with high melting points, high phase composition stability, high thermal conductivity, good thermal shock and oxidation resistance are needed. The transition metal diborides, mainly include ZrB2 and HfB2, have melting temperatures of above 3000°C, and can basically meet the above demands. However, the oxidation resistance of diboride monolithic ceramics at ultra-high temperatures need to be improved for the applications in thermal protection systems for future aerospace vehicles and jet engines. On the other hand, processing science for making high performance UHTCs is another hot topic in the UHTC field. Densification of UHTCs at mild temperatures through reactive sintering is an attracting way due to the chemically stable phase composition and microstructure as well as clean grain boundaries in the obtained materials. Moreover, the stability studies of the materials in phase composition and microstructures at ultra high application temperatures is also critical for materials manufactured at relatively low temperature. Furthermore, the oxidation resistance in simulated reentry environments instead of in static or flowing air of ambient pressure should be evaluated. Here we will report the concept, advantages and some recent progress on the reactive sintering of diboride–based composites at mild temperatures.

Influence of B4C on oxidation resistance of PSN/borosilicate glass-B4C field-based repair coating of C/C aircraft brake materials at 700–900 °C

2019 ◽  
Vol 45 (16) ◽  
pp. 20860-20872 ◽  
Author(s):  
Juanli Deng ◽  
Kaiyue Hu ◽  
Baofu Lu ◽  
Bohan Zheng ◽  
Shangwu Fan ◽  
...  
Keyword(s):  
Oxidation Resistance ◽  
Borosilicate Glass

Effects of Cr+ ion implantation on the oxidation of Ni3Al

1993 ◽  
Vol 8 (4) ◽  
pp. 734-740 ◽  
Author(s):  
M. Chen ◽  
S. Patu ◽  
J.N. Shen ◽  
C.X. Shi
Keyword(s):  
Oxidation Resistance ◽  
Layer Structure ◽  
Surface Region ◽  
Optical Microscope ◽  
Al Alloy ◽  
Temperature Oxidation ◽  
Intermediate Layers ◽  
Air Interface ◽  
Before And After ◽  
High Temperature Oxidation Behavior

Ni3Al samples were implanted with different doses of 150 keV Cr+ ions to modify the surface region. The high temperature oxidation behavior was tested. The surface layer structure was investigated by AES, TEM, XRD, and optical microscope before and after the test. The experimental results show that chromium ions turn a small amount of ordered superlattice Ni3Al phase into a disordered Ni–Al–Cr phase. Also there is a bcc chromium phase in the implanted sample. Implanted Ni3Al alloy has better oxidation resistance than the unimplanted one at 900 °C. The oxide layer is of a multilayer structure after 50 h oxidation, composed of a NiO inner layer, Cr2O3, spinel NiAl2O4 intermediate layers, and an α–Al2O3 external layer at the oxide/air interface. The α-Al2O3 and Cr2O3 are independent scale-like layers. The two protective layers improve the oxidation resistance significantly. The effects of implanted elements and possible reaction mechanisms are discussed.

Effect of Hf Content on Oxidation Resistance of Single Crystal Superalloy at 1000°C

2014 ◽  
Vol 915-916 ◽  
pp. 562-566 ◽  
Author(s):  
Z.X. Shi ◽  
Shi Zhong Liu ◽  
M. Han ◽  
J.R. Li
Keyword(s):  
Grain Size ◽  
Single Crystal ◽  
Oxide Scale ◽  
Oxide Layer ◽  
Oxidation Resistance ◽  
Isothermal Oxidation ◽  
Single Crystal Superalloy ◽  
Ambient Atmosphere ◽  
Directionally Solidified ◽  
Better Than

The specimens of single crystal superalloy DD6 with 0.10% Hf and 0.47% Hf were prepared in the directionally solidified furnace. The effect of Hf content on the isothermal oxidation resistance of the second generation single crystal superalloy DD6 was studied at 1000°Cin ambient atmosphere. Morphology of oxides was examined by SEM, and their composition was analyzed by XRD and EDS. The experimental results show that the oxidation resistance of DD6 alloy with 0.47% Hf is better than that of the alloy with 0.10% Hf. The alloy with different Hf content all obeys parabolic rate law during oxidation for 100h at 1000°C. The increase of Hf content can promote the Al2O3 formation and decreases the proportion of NiO. The oxide grain size and the thickness of the oxide layer all reduce with increasing of Hf content. The oxide scale of the alloy with different Hf content is made up of an outer NiO layer with a small amount of Co3O4, inner Al2O3 and Cr2O3 layer with a small amount of TaO2.

Thermal Stablility and Oxidation Resistance of CrAlSiN Nano-Structured Coatings Deposited by Lateral Rotating Cathode Arc

2010 ◽  
Vol 447-448 ◽  
pp. 725-729 ◽  
Author(s):  
Jhun Yew Cheong ◽  
Xing Zhao Ding ◽  
Beng Kang Tay ◽  
Xian Ting Zeng
Keyword(s):  
Oxidation Resistance ◽  
Deposition Process ◽  
Surface Oxide Layer ◽  
Ambient Atmosphere ◽  
Temperature Oxidation ◽  
X Ray ◽  
Good Oxidation Resistance ◽  
Before And After ◽  
Different Temperatures ◽  
Cathode Arc

In this paper, CrAlSiN coatings are deposited by a lateral rotating cathode arc technique. The high temperature oxidation behaviors of these coatings are studied in ambient atmosphere at temperatures ranging from 800°C-1000°C for an hour. The ternary TiAlN coating is used as the benchmark in this study. The surface morphology and chemical composition of the coating samples before and after oxidation at different temperatures are analyzed by scanning electron microscopy (SEM) equipped by energy dispersive X-ray spectrometer (EDX), glow discharge optical spectrometry (GDOS) and X-ray diffraction (XRD). The CrAlSiN coatings show much better oxidation resistance than the TiAlN coatings. TiAlN starts to oxidize from 800oC and forms a complete surface oxide layer after oxidation at 1000oC for an hour. However, CrAlSiN shows a relatively good oxidation resistance below 1000oC and only is oxidized to form a thin oxide scale with a thickness of 0.3 µm at 1000oC for one hour. It is found that the oxidation of both coatings is triggered from the surface metallic droplets generated by the arc deposition process.

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