Enhanced electric conductivity of polymer‐derived Si<scp>CN</scp> ceramics by microwave post‐treatment

Shao, Gang; Wu, Peng; Ma, Chao; Zhao, Wanyu; Guo, Jingxia; Feng, Yue; Wang, Hailong; Zhang, Rui; An, Linan

doi:10.1111/jace.14590

Cited by 21 publications

(45 citation statements)

References 31 publications

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“…The elastic constants were calculated by means of finite displacement methods. 30 The elastic moduli of polycrystalline b-Si 3 (C x ,N 1Àx ) 4 were calculated according to the Voight-Reuss-Hill bounds. 31 The ideal tensile strengths were calculated by stretching the crystal cell along 11 20 ½ , 1100 ½ and 0001 ½ direction, respectively.…”

Section: First-principles Calculationsmentioning

confidence: 99%

“…Once the shear strain energy density and tensile strain energy density are obtained, the brittleness, g, of b-Si 3 (C x ,N 1Àx ) 4 can be evaluated as,…”

Section: First-principles Calculationsmentioning

confidence: 99%

“…where B is bulk modulus, Ω 0 the cell volume in ground state, N the number of atoms in supercell, D is a coefficient of 0.157 for intrinsically brittle materials. 4 , with carbon concentration of 0, 5, 10 wt%, respectively, were fabricated by self-propagation high-temperature synthesis (SHS). Raw materials were purchased from Sinopharm Chemical Reagent, and used without further purification.…”

Section: First-principles Calculationsmentioning

confidence: 99%

“…Carbonitrides, which are conceived to be solid solution composed of carbides and nitrides, have received considerable attention due to their remarkable physical, chemical, mechanical, and biomedical properties . Recently, carbonitrides have been used as lithium‐ion batteries, soft magnetic materials, high‐temperature electric and heat conductor, oxidation‐resistant, corrosion‐resistant, and wear‐resistant materials . Most importantly, the noticeable advantage of carbonitrides is that the mechanical, optical, and electronic properties can be manipulated by controlling the carbon and nitrogen concentrations …”

Section: Introductionmentioning

confidence: 99%

“…Now, silicon carbonitride is considered as a good choice, although it has been observed that the solid solution of silicon carbonitride is limited by the solubility of carbon. 20,21 In this study, in order to make use of superiority of b-Si 3 (C x ,N 1Àx ) 4 to compensate for the lack of b-Si 3 N 4 as a rolling bearing material for high-temperature and highspeed applications, the solubility of carbon in silicon carbonitride was studied first. Then, limiting the carbon concentration within the solubility, the influence of carbon concentration on electronic structure, elastic properties, deformation behavior, ductility, and fracture toughness of silicon carbonitride solid solution were investigated by first-principles calculations, and experimental validation followed to make a comparison with theoretical results.…”

mentioning

confidence: 99%

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Influence of carbon on stability, mechanical property, electronic structure, and lattice dynamics of silicon carbonitride

Hua

Zhong

et al. 2018

J Am Ceram Soc

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In this study, first‐principles calculations were performed to study the stability, mechanical property, electronic structure and lattice dynamics of β‐Si3(Cx,N1−x)4 silicon carbonitride. The solubility of carbon in β‐Si3(Cx,N1−x)4 having a stable structure is shown to be about 15 at.%. Within the limit of solubility, an increase in carbon concentration in β‐Si3(Cx,N1−x)4 will lead to a decrease in the Young's modulus and density and an increase in the Poisson's ratio. The study of deformation behavior shows that the most likely slip system of 11¯000001 is on prismatic plane rather than on basal plane. This feature of β‐Si3(Cx,N1−x)4 is similar to WC. In addition, the ductility and fracture toughness of β‐Si3(Cx,N1−x)4 can be optimized by controlling the carbon concentration. The improvement in ductility and fracture toughness can be attributed to the formation of metallic bonds by the incorporation of carbon atoms. The lattice dynamics study shows that the structural stability of β‐Si3(Cx,N1−x)4 is controlled by energy stability criteria under stress‐free condition. In the stressed state, the structural stability of β‐Si3(Cx,N1−x)4 is controlled by the elastic stability criteria. Subsequently, the β‐Si3(Cx,N1−x)4 solid solution was prepared by self‐propagating high‐temperature synthesis (SHS), and the carbon‐concentration‐dependent mechanical properties were consistent with the first‐principles calculations. The maximum fracture toughness of 10.4 MPa·m0.5 was obtained in β‐Si3(Cx,N1−x)4 at carbon concentration of 5 wt%, which means that the solid solution toughening can be used as a supplement to crack bridging toughening and phase transition toughening for ceramic toughening. The results obtained in this study reveal that the β‐Si3(Cx,N1−x)4 solid solution is a promising candidate for high‐speed ceramic bearings.

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Section: First-principles Calculationsmentioning

confidence: 99%

“…Once the shear strain energy density and tensile strain energy density are obtained, the brittleness, g, of b-Si 3 (C x ,N 1Àx ) 4 can be evaluated as,…”

Section: First-principles Calculationsmentioning

confidence: 99%

Section: First-principles Calculationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Influence of carbon on stability, mechanical property, electronic structure, and lattice dynamics of silicon carbonitride

Hua

Zhong

et al. 2018

J Am Ceram Soc

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A Strain‐Temperature Integrated Polymer‐Derived SiCN Ceramic High Temperature Sensor with Wide‐Range and Ultra‐Short Response Time

Yang,

Ma,

et al. 2024

Adv Funct Materials

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Fabricating strain sensors with high response in a wide temperature and strain range is still a challenge, especially in high temperature harsh environments. Herein, a dual‐functional sensor with cantilever beam structure is fabricated using polymer‐derived SiCN ceramics, which can be applied for temperature and stain monitor. The performance of the integrated sensor is evaluated from room temperature to 1000 °C and the related sensing mechanism is analyzed. The prepared strain sensor has ultrafast response of 60 ms in the strain range of 0–3500 µε and the maximum strain rate can reach 46 200 µε s−1. Moreover, the sensor has excellent stability and ultra‐high sensitivity under high temperature environments. Additionally, the temperature can be detected separately up to 1000 °C without any disturbance. This attractive integration sensor with competitive sensitivity, excellent stability, ultrafast response speed, and broad range, has great potential to detect temperature and strain signals for practical application in high temperature extreme environments.

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Abnormal Graphitization Behavior in Near‐Surface/Interface Region of Polymer‐Derived Ceramics

Lin

Pan

et al. 2022

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A free carbon phase has been proven to be beneficial for many structural and functional properties of PDCs, such as electrical conductivity, [8][9][10][11][12][13][14] electromagnetic properties, [15][16][17] electrochemical properties, [18,19] piezoelectricity, [20,21] corrosion resistance, [22] and oxidation resistance. [23] In high-temperature sensing applications, the concentration and morphology of free carbon strongly affect the electrical properties of devices and the selectivity/sensitivity of sensors. [4] In energy applications, PDCs are considered promising for electrical energy storage in devices ranging from cell phones to electric cars. [24] The electrical conductivity or free carbon morphology of PDC-based anode materials for lithium ion batteries plays an important role in achieving high reversible capacity, good rate performance, and reliable cycle stability. [25] In electromagnetic wave absorbing and shielding applications, an increase in the free carbon concentration of PDCs leads to an increase in the dielectric loss and, in turn, improves the total shielding effectiveness in terms of both absorption and reflection shielding effectiveness. [26] Therefore, the microstructural evolution of carbon and the properties resulting from the same are of great interest in this research area.This leads to the fundamental and common question of how to effectively regulate the structural evolution of carbon to further enhance the performance of PDCs. The polymer-toceramic transformation process of most PDCs mainly includes the synthesis of a preceramic precursor, shaping, cross-linking, and pyrolysis. [2,27] Amorphous PDCs undergo a devitrification process to form an amorphous multiphase system through a redistribution reaction of chemical bonds under hightemperature conditions. [2,27] The separated free carbon phase undergoes a graphitization process that plays an important role in the microstructural evolution of PDCs. [4] Many studies have claimed that the amount of free carbon within PDCs strongly depends on the thermal stability of the hydrocarbon linkages rather than on the percentage of the total carbon content of the polymer; therefore, a large number of new precursor solutions (e.g., polysiloxane or polysilazane, carbon-rich or carbonpoor polymers) and optimized heat-treatment parameters (e.g., temperature, atmosphere, and holding time) have been designed and explored to improve the graphitization level of The in situ free carbon generated in polymer-derived ceramics (PDCs) plays a crucial role in their unique microstructure and resultant properties. This study advances a new phenomenon of graphitization of PDCs. Specifically, whether in micro-/nanoscale films or millimeter-scale bulks, the surface/interface radically changes the fate of carbon and the evolution of PDC nanodomains, promotes the graphitization of carbon, and evolves a free carbon enriched layer in the near-surface/interface region. Affected by the enrichment behavior of free carbon in the near-surface/interface region, PDCs exhibit h...

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Enhanced electric conductivity of polymer‐derived SiCN ceramics by microwave post‐treatment

Cited by 21 publications

References 31 publications

Influence of carbon on stability, mechanical property, electronic structure, and lattice dynamics of silicon carbonitride

Influence of carbon on stability, mechanical property, electronic structure, and lattice dynamics of silicon carbonitride

A Strain‐Temperature Integrated Polymer‐Derived SiCN Ceramic High Temperature Sensor with Wide‐Range and Ultra‐Short Response Time

Abnormal Graphitization Behavior in Near‐Surface/Interface Region of Polymer‐Derived Ceramics

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