scholarly journals Effect of MoSi2-Si3N4/SiC Multi-Layer Coating on the Oxidation Resistance of Carbon/Carbon Composites above 1770 K

2020 ◽  
Vol 4 (3) ◽  
pp. 86 ◽  
Author(s):  
Imran Abbas ◽  
Yanxiang Wang ◽  
Hassan Elahi ◽  
Muhammad Ali Siddiqui ◽  
Mudaser Ullah ◽  
...  
Keyword(s):  
Oxidation Resistance ◽  
High Temperatures ◽  
Carbon Matrix ◽  
Carbon Composite ◽  
Vital Role ◽  
Carbon Composites ◽  
Micro Cracks ◽  
Coated Carbon ◽  
And Diffusion ◽  
Layer Coating

To improve the oxidation resistance of carbon/carbon composites at high temperatures (>1770 K), they were coated with MoSi2-Si3N4/SiC. The slurry and pack cementation methods were adopted to deposit the inner SiC layer and outer MoSi2-Si3N4 layer. The phase composition, microstructure, and elemental distributions in the coating were analyzed using SEM, XRD, EDS, and Raman spectroscopy. Oxidation tests show that the deposited multi-layer coating can protect the carbon/carbon matrix from oxidation at high temperatures (>1770 K) for 150h and that the coating can withstand 40 thermal cycles between 1773 and 300 K. It is observed that Si3N4 assists in the formation of a dense SiO2 layer at a high temperature, which plays a vital role in increasing the thermal cyclic and oxidation resistance of the coating itself. The weight loss of coated carbon/carbon composite is attributed to the formation of micro-cracks and diffusion of SiO2, MoO3, and N2 out of the material at high temperatures.

Mo–Si–B ALLOYS OXIDATION PROTECTIVE COATING FOR SiC-COATED CARBON/CARBON COMPOSITES

2009 ◽  
Vol 16 (02) ◽  
pp. 223-229 ◽  
Author(s):  
TAO FENG ◽  
HE-JUN LI ◽  
QIAN-GANG FU ◽  
XIAO-HONG SHI ◽  
KE-ZHI LI
Keyword(s):  
Weight Loss ◽  
Oxidation Resistance ◽  
Double Layer ◽  
Protective Coating ◽  
Argon Atmosphere ◽  
Intermediate Temperature ◽  
Carbon Composites ◽  
Glass Film ◽  
Coated Carbon ◽  
Layer Coating

A novel Mo – Si – B double-layer coating was prepared for the carbon/carbon ( C / C ) composites by pack cementation in an argon atmosphere. The structures of the double-layer coatings were characterized by XRD and SEM. The as-received coating shows an excellent oxidation resistance at high and intermediate temperature. It could effectively protect C / C composites from oxidation for 30 h with a weight loss of 0.9% in air at 1873 K, and for 25 h with a weight loss of l.7% at 1173 K. The oxidation protective coating was principally due to producing eutectic glass film for decreasing oxygen diffusing through the penetrable cracks in the coating.

Self-healing ZrB 2 –SiO 2 oxidation resistance coating for SiC coated carbon/carbon composites

2016 ◽  
Vol 110 ◽  
pp. 265-272 ◽  
Author(s):  
Ouyang Haibo ◽  
Li Cuiyan ◽  
Huang Jianfeng ◽  
Cao Liyun ◽  
Fei Jie ◽  
...  
Keyword(s):  
Oxidation Resistance ◽  
Carbon Composites ◽  
Self Healing ◽  
Coated Carbon

Microstructure and oxidation resistance of Si–Mo–B coating for C/SiC coated carbon/carbon composites

2013 ◽  
Vol 72 ◽  
pp. 150-155 ◽  
Author(s):  
Yu-Lei Zhang ◽  
He-Jun Li ◽  
Zhi-Xiong Hu ◽  
Jin-Cui Ren ◽  
Ke-Zhi Li
Keyword(s):  
Oxidation Resistance ◽  
Carbon Composites ◽  
Coated Carbon

LaB6 modified MoSi2 ceramic coating of SiC coated carbon/carbon composites for oxidation resistance at high temperature

2014 ◽  
Vol 40 (4) ◽  
pp. 6355-6358 ◽  
Author(s):  
Xiao-Hong Shi ◽  
Yan-Cai Ren ◽  
He-Jun Li ◽  
Ting Li ◽  
Xin Zhang ◽  
...  
Keyword(s):  
High Temperature ◽  
Oxidation Resistance ◽  
Ceramic Coating ◽  
Carbon Composites ◽  
Coated Carbon

MODIFIED SiC-MoSi2 OXIDATION PROTECTIVE COATING FOR SiC-COATED CARBON/CARBON COMPOSITES THROUGH INFILTRATING LIQUID Si

2011 ◽  
Vol 18 (03n04) ◽  
pp. 109-114 ◽  
Author(s):  
ZHENG-ZHONG ZHANG ◽  
HE-JUN LI ◽  
CHAO MA ◽  
QIAN-GANG FU ◽  
YU-LEI ZHANG ◽  
...  
Keyword(s):  
Phase Composition ◽  
Mass Loss ◽  
Oxidation Resistance ◽  
Protective Coating ◽  
Pack Cementation ◽  
Carbon Composites ◽  
Test Results ◽  
Oxidation Test ◽  
Coated Carbon ◽  
Pack Cementation Process

To improve the oxidation resistance of the SiC-MoSi2 coating prepared by two-step pack cementation, a liquid Si infiltrating method was adopted to modify it. The phase composition and microstructure of the coatings were analyzed by XRD and SEM. The results show that the size and number of the cracks in the modified coating decreased evidently after infiltrating Si . The oxidation test results in air at 1773 K show that the mass loss of the SiC-MoSi2 coating coated carbon/carbon (C/C) composites was up to 1.18% after oxidation for 206 h, while that of the modified coating coated C/C composites was only 0.77% after oxidation for 460 h. The reason is that the cracks formed in the pack cementation process were partly sealed and there were no penetrable cracks in the modified coating. Therefore, there were no direct channels for the oxygen to diffuse into the C/C substrate.

Influence of Pulse Frequency on the Structure and Oxidation Resistance of AlPO4 Ceramics Coating and its Deposition Dynamics

2016 ◽  
Vol 852 ◽  
pp. 1095-1101
Author(s):  
Lei Zhou ◽  
Jian Feng Huang ◽  
Li Yun Cao ◽  
He Jun Li ◽  
Wei Hao ◽  
...  
Keyword(s):  
Oxidation Resistance ◽  
Arc Discharge ◽  
Pulse Frequency ◽  
Carbon Composites ◽  
Deposition Method ◽  
Good Oxidation Resistance ◽  
Oxidation Resistant ◽  
Oxidation In Air ◽  
Coated Carbon ◽  
Outer Coating

A facile pulse arc discharge deposition method was developed to prepare AlPO4 oxidation resistant outer coating on SiC pre-coated carbon/carbon composites (SiC-C/C). The deposition dynamics and the influence of pulse frequency on composition, microstructure and oxidation resistance of the as-prepared coating were investigated. Results show that pulse arc discharge deposition is an effective route to achieve dense and crack-free AlPO4 coatings. The deposition activation energy of the AlPO4 coating is calculated to be 3.07 kJ·mol-1. The AlPO4 coating prepared at a pulse frequency of 2000 Hz exhibits good oxidation resistance, which can effectively protect C/C composites from oxidation in air at 1773 K for 262 h with a weight loss of 1.58%.

OXIDATION RESISTANT (Mo,W)Si2 COATING FOR SiC-COATED CARBON/CARBON COMPOSITES BY IN SITU FORMATION METHOD

2009 ◽  
Vol 16 (02) ◽  
pp. 309-313 ◽  
Author(s):  
QIAN-GANG FU ◽  
HE-JUN LI ◽  
KE-ZHI LI ◽  
KE TONG ◽  
XI-YUAN YAO
Keyword(s):  
Carbon Composites ◽  
Dense Microstructure ◽  
Information Method ◽  
Formation Method ◽  
Oxidation Resistant ◽  
In Situ Formation ◽  
Oxidation In Air ◽  
Coated Carbon ◽  
Layer Coating

In order to protect carbon/carbon ( C / C ) composites against oxidation, a ( Mo , W ) Si 2 coating was prepared on the surface of SiC -coated C / C composites by a simple in situ information method using Si , Mo and W as starting materials. The microstructures and oxidation protective ability of the as-received coating were investigated. The results show that the ( Mo , W ) Si 2 outer layer coating containing free Si has a good bonding with SiC inner layer. The as-prepared SiC /( Mo , W ) Si 2 coating can protect C / C composites from oxidation in air at 1773 K for 252 h with a weight gain of 1.56 wt.%. The excellent oxidation resistant property of the double-layer coating is attributed to its dense microstructure and the formation of the stable glassy SiO 2 film on the ( Mo , W ) Si 2 coating surface during its exposure to air at high temperatures.

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