Effect of cellulose additive on the silicon carbide film by decomposition and conversion of silicon nitride

Chen, Song; Chen, Changlian; Liang, Xin; Wu, Changsheng; Ji, Jiayou; Xu, Man; Zhang, Zhan‐Hui; Huang, Zhiliang

doi:10.1016/j.ceramint.2019.12.040

Cited by 4 publications

(4 citation statements)

References 8 publications

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“…Under the condition of an argon atmosphere, SiC-based powder will decompose to produce various gas molecules SimCn (mainly Si, Si2C, and SiC2, etc.) when the temperature reaches 2,000°C [11,12] .…”

Section: Influence Of Sintering Temperature On the Formation Of Sic F...mentioning

confidence: 99%

Preparation of Silicon Carbide Film by Composite Sintering of Silicon Nitride and Silicon Carbide

Sun

Huang

Chen

et al. 2022

J. Phys.: Conf. Ser.

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Graphite can be protected by coating it with a silicon carbide film. However, studies on the effects of different coating methods and process parameters on the thickness and bond strength of the films are not yet mature. In this paper, silicon nitride (Si3N4) and silicon carbide (SiC) are used as raw materials, and SiC films are successfully prepared on the surface of graphite substrate by composite sintering at high temperatures. The phase and microstructure of SiC films were characterized by X-ray diffractometer (XRD) and scanning electron microscope (SEM), respectively, and the effect and mechanism of sintering temperature on the formation of SiC films were investigated. The results show that Si3N4 and SiC decompose under high temperatures to generate silicon vapor and carbon-silicon gas molecules, which migrate to the graphite surface to react with C and recrystallize to form a SiC film. The main crystal phase of the SiC film at high temperature is 3C-SiC, the spherical SiC grains with smooth surfaces and small size gradually grow into regular hexagonal grains, and the SiC film is denser and thicker.

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Section: Influence Of Sintering Temperature On the Formation Of Sic F...mentioning

confidence: 99%

Preparation of Silicon Carbide Film by Composite Sintering of Silicon Nitride and Silicon Carbide

Sun

Huang

Chen

et al. 2022

J. Phys.: Conf. Ser.

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“…The first approach involves using polysilazane as a precursor [ 4 ], and the fiber is prepared through processes such as spinning, non-melting treatment, pyrolysis [ 5 ], and high-temperature sintering. This method yields silicon nitride fibers with consistent composition, making it easier to obtain fibers with high strength and low defects [ 6 ]. The second approach utilizes polycarbosilane as a precursor and follows a representative process route that includes spinning, non-melting treatment, nitridation and decarburization, and high-temperature sintering.…”

Section: Introductionmentioning

confidence: 99%

Atomistic Construction of Silicon Nitride Ceramic Fiber Molecular Model and Investigation of Its Mechanical Properties Based on Molecular Dynamics Simulations

Hong,

Zhu,

et al. 2023

Materials

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Molecular simulations are currently receiving significant attention for their ability to offer a microscopic perspective that explains macroscopic phenomena. An essential aspect is the accurate characterization of molecular structural parameters and the development of realistic numerical models. This study investigates the surface morphology and elemental distribution of silicon nitride fibers through TEM and EDS, and SEM and EDS analyses. Utilizing a customized molecular dynamics approach, molecular models of amorphous and multi-interface silicon nitride fibers with complex structures were constructed. Tensile simulations were conducted to explore correlations between performance and molecular structural composition. The results demonstrate successful construction of molecular models with amorphous, amorphous–crystalline interface, and mixed crystalline structures. Mechanical property characterization reveal the following findings: (1) The nonuniform and irregular amorphous structure causes stress concentration and crack formation under applied stress. Increased density enhances material strength but leads to higher crack sensitivity. (2) Incorporating a crystalline reinforcement phase without interfacial crosslinking increases free volume and relative tensile strength, improving toughness and reducing crack susceptibility. (3) Crosslinked interfaces effectively enhance load transfer in transitional regions, strengthening the material’s tensile strength, while increased density simultaneously reduces crack propagation.

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“…Silicon nitride (Si 3 N 4 ) was decomposed and transformed into SiC to promote the grain growth of SiC ceramics at high temperatures 24,25 . As a consequence, high‐purity recrystallized SiC ceramics were fabricated.…”

Section: Introductionmentioning

confidence: 99%

“…Silicon nitride (Si 3 N 4 ) was decomposed and transformed into SiC to promote the grain growth of SiC ceramics at high temperatures. 24,25 As a consequence, high-purity recrystallized SiC ceramics were fabricated. In this study, the effects of fine powder content on bulk density and flexural strength were investigated, and the crystal phase and microstructure were characterized.…”

Section: Introductionmentioning

confidence: 99%

Recrystallization sintering and characterization of composite powders composed of two types of SiC with dissimilar particle sizes

Huang

Sun

Wang

et al. 2022

Int J Applied Ceramic Tech

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Pure silicon carbide (SiC) ceramics were prepared through recrystallization sintering by using two types of SiC powder, with different particle sizes, as the raw materials. The effects of the fine powder content on the bulk density, porosity, flexural strength, and grain morphology were investigated. In the synthesis process, silicon nitride (Si3N4) was used as the sintering additive that decomposed and transformed into SiC to promote the growth of SiC grains. The added fine powder was exploited in the evaporation and condensation process and grain amalgamation caused by the movement of the grain boundaries. Thus, a dissimilar fine powder content modulated the microstructure and mechanical strength of the SiC ceramics. The results indicate that the bulk density and flexural strength increase to a maximum of 2.12 g/cm3, 44.2 MPa, respectively, when the fine powder content is 40 wt.%. Three kinds of grain morphologies, that is, uniform equiaxed grains, round, equiaxed grains, and hexagonal platelet grains, and the maximum average pore size (3.62 μm) are obtained when the fine powder content is between 0 wt.% and 60 wt.%. In addition, the main crystal phase 6H‐SiC is partially converted to 4H‐SiC when the fine powder content is up to 60 wt.%.

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Effect of cellulose additive on the silicon carbide film by decomposition and conversion of silicon nitride

Cited by 4 publications

References 8 publications

Preparation of Silicon Carbide Film by Composite Sintering of Silicon Nitride and Silicon Carbide

Preparation of Silicon Carbide Film by Composite Sintering of Silicon Nitride and Silicon Carbide

Atomistic Construction of Silicon Nitride Ceramic Fiber Molecular Model and Investigation of Its Mechanical Properties Based on Molecular Dynamics Simulations

Recrystallization sintering and characterization of composite powders composed of two types of SiC with dissimilar particle sizes

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