Influence of Features of Silicon Carbide Ceramic Matrix Composite (Cp/SiC) on Carbon Content

2012 ◽  
Vol 512-515 ◽  
pp. 1639-1642 ◽  
Author(s):  
You Jun Lu ◽  
Yan Min Wang
Keyword(s):  
Silicon Carbide ◽  
Carbon Particle ◽  
Ceramic Matrix Composite ◽  
Mechanochemical Method ◽  
Resistant Material ◽  
Silicon Carbide Ceramic ◽  
Sic Ceramic ◽  
Sic Composites ◽  
Fire Resistant Material ◽  
Better Than

In this article, the properties of carbon particle modified silicon carbide (Cp/SiC) composites was studied. The mixture powder of nano carbon black and submicro-SiC was prepared through soft mechanochemical method. Then Cp/SiC composites was pressureless sintered.The result shows that appropriate content of carbon is 25 percent in this condition the machinability of Cp/SiC is better than that of SiC ceramic. At the same time, the oxidation resistence, wear resistence, and flexure strength of Cp/SiC meet the challenge for special fire resistant material.

Research Advancement on Laser Etching Technology of Silicon Carbide Ceramic Matrix Composite

2020 ◽  
Vol 47 (6) ◽  
pp. 0600002
Author(s):  
翟兆阳 Zhai Zhaoyang ◽  
梅雪松 Mei Xuesong ◽  
王文君 Wang Wenjun ◽  
崔健磊 Cui Jianlei
Keyword(s):  
Silicon Carbide ◽  
Matrix Composite ◽  
Ceramic Matrix Composite ◽  
Ceramic Matrix ◽  
Laser Etching ◽  
Silicon Carbide Ceramic

Some observations in grinding SiC and silicon carbide ceramic matrix composite material

2019 ◽  
Vol 103 (5-8) ◽  
pp. 3175-3186 ◽  
Author(s):  
Yadong Gong ◽  
Shuoshuo Qu ◽  
Yuying Yang ◽  
Chunyou Liang ◽  
Pengfei Li ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Composite Material ◽  
Matrix Composite ◽  
Ceramic Matrix Composite ◽  
Ceramic Matrix ◽  
Silicon Carbide Ceramic

Comparative Study of Biomorphic Silicon/Silicon Carbide Ceramic from Birch and Compressed Birch

2010 ◽  
Vol 434-435 ◽  
pp. 609-612 ◽  
Author(s):  
Zi Li Yan ◽  
Jie Liu ◽  
Jian Chun Zhang ◽  
Tian Ma ◽  
Zheng Cao Li
Keyword(s):  
Silicon Carbide ◽  
Treatment Method ◽  
Compression Process ◽  
Silicon Carbide Ceramic ◽  
Sic Ceramics ◽  
Carbon Template ◽  
Wood Compression ◽  
Sic Ceramic ◽  
Pre Treatment ◽  
Silicon Silicon

Wood compression process was innovatively introduced as a pre-treatment method to birch into the fabrication of biomorphic silicon/silicon carbide (Si/SiC) ceramic with high density. Firstly, birch blocks were compressed to the density in the range of 0.85-1.00g/cm3. Secondly, both birch blocks and compressed birch blocks were carbonized at 1200°C to get carbon templates. Lastly, carbon templates were infiltrated with liquid silicon to obtain biomorphic Si/SiC ceramics. The effect of compression process on the density and microstructure of both carbon template and ceramic was investigated. The results show that the maxium density of biomorphic Si/SiC ceramic from compressed birch is 3.01g/cm3, whereas the density of the ceramic from birch is only 2.80-2.89g/cm3. So the compression process was an effective method to increase the density of biomorphic Si/SiC ceramic.

High Temperature Oxidation Behavior of Silicon Carbide Ceramic

2016 ◽  
Vol 680 ◽  
pp. 89-92 ◽  
Author(s):  
Ming Wei Chen ◽  
Hai Peng Qiu ◽  
Jian Jiao ◽  
Yu Wang ◽  
Wei Jie Xie
Keyword(s):  
Silicon Carbide ◽  
Ceramic Matrix Composite ◽  
Sio2 Film ◽  
Oxidation Products ◽  
Low Oxygen ◽  
Temperature Oxidation ◽  
Molecular Gases ◽  
Oxidation Thermodynamics ◽  
Sic Ceramic ◽  
High Temperature Oxidation Behavior

Oxidation thermodynamics of silicon carbide (SiC)ceramic was studied by means of HSC Chemistry code, and the weight change, morphology and phase of oxidation products were analyzed by thermogravimetric analysis(TG), scanning electron microscopy(SEM ) and X-ray diffraction (XRD). The results showed that SiC ceramic could be oxidized to silicon dioxide(SiO2) with release of small molecular gases under oxidizing atmosphere at 800°C, and the formed SiO2 film with appropriate fluidity and low oxygen diffusion coefficient could prevent the spread of oxygen with the oxidation temperature increasing up to 1200°C, which favored the anti-oxidation of SiC ceramic matrix composite.

Investigation of High-Speed Nanogrinding Mechanism Based on Molecular Dynamics

2018 ◽  
Author(s):  
Yao Liu ◽  
Beizhi Li ◽  
Yihao Zheng
Keyword(s):  
Molecular Dynamics ◽  
Silicon Carbide ◽  
Brittle Material ◽  
High Speed ◽  
Ground Surface ◽  
Wheel Speed ◽  
Depth Of Cut ◽  
Silicon Carbide Ceramic ◽  
Ductile Grinding ◽  
Sic Ceramic

The SiC ceramic ductile grinding, which can obtain crack-free ground surface, is a challenge in brittle material machining. To understand the brittle material ductile grinding mechanism in the nanoscale, a molecular dynamics (MD) model is built to study the single diamond grit grinding silicon carbide ceramic. Through analyzing the MD simulation process, the grit forces the SiC to deform and form the chip through the plastic deformation and flow. The ground surface has no crack on the surface and damage layer thickness is less than one atom layer under the nanoscale depth of cut, which indicates the nanogrinding can achieve the pure ductile grinding for the SiC ceramic and obtain a crack-free and high-quality ground surface. Grinding force, stress, temperature, and specific energy increase with the wheel speed and depth of cut due to the higher grinding speed and a smaller depth of cut can generate a higher density of defects (vacancies, interstitial atoms, and dislocations) on the workpiece, which can make the silicon carbide ceramic more ductile. The high wheel speed is favorable for the ductile grinding.

Monitoring Fatigue of SiC/SiC Ceramic Matrix Composites With Acoustic Emission and Electrical Resistance

2019 ◽  
Author(s):  
Zipeng Han ◽  
Gregory N. Morscher
Keyword(s):  
Silicon Carbide ◽  
Acoustic Emission ◽  
Electrical Resistance ◽  
Fracture Mechanism ◽  
Ceramic Matrix Composites ◽  
Matrix Composites ◽  
R Ratio ◽  
Sic Ceramic ◽  
Sic Composites ◽  
Observed Damage

Abstract Acoustic emission (AE) and electrical resistance (ER) have been effective methods to monitor damage in SiC/SiC composites for a variety of loading conditions. In this study, the change of ER and modal AE were monitored on woven silicon carbide fiber-reinforced silicon carbide (SiC/SiC) composite under cyclic loading (fatigue) conditions at room temperature. In particular, the AE activity will be emphasized in this work as it relates to ER and observed damage. Significant increase of ER and AE activities were observed during the “initial” and sometimes “final” parts of the experiments. For tests at higher fatigue frequency conditions, AE activity was significant near the end of the test which was correlated with damage predominant in the region that was ultimately the failure region. Most of these events occurred during the unload portion of the cycle, i.e., “valley” and inferred a compressive micro-fracture mechanism. Microscopy of polished sections showed increased damage very near the fracture surface, including longitudinal and shear cracking in the 90-tow region of the composite which corresponded to the “valley” AE events. For the lowest frequency fatigue condition (0.01 Hz), no valley events were observed. The compressive micro-fracture mechanism observed in this study is a new observation for progressive damage in these types of composites. More study is required to isolate the cause(s) of this behavior which are probably related to fatigue frequency, R ratio and/or porosity content.

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