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Laser & Optoelectronics Progress, Volume. 56, Issue 9, 091404(2019)

Fabrication of High Strength and Low Thermal Conductivity Graphite/Ceramic Composites by Selective Laser Sintering and Gelcasting

Haihua Wu*, Yu Sun, Kui Chen, and Yafeng Li
Author Affiliations
  • Hubei Key Laboratory of Hydroelectric Machinery Design and Maintenance, China Three Gorges University, Yichang, Hubei 443002, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (8)
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    Figures & Tables(8)
    Flow chart of fabrication process of composite

    Fig. 1. Flow chart of fabrication process of composite

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    Porous graphite preform and its surface SEM image. (a) Image of preform; (b) SEM image magnified by 60 times; (c) SEM image magnified by 600 times

    Fig. 2. Porous graphite preform and its surface SEM image. (a) Image of preform; (b) SEM image magnified by 60 times; (c) SEM image magnified by 600 times

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    Thermogravimetric curve of greenbody for gelcasting

    Fig. 3. Thermogravimetric curve of greenbody for gelcasting

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    Curve of optimized high temperature sintering process of ceramics

    Fig. 4. Curve of optimized high temperature sintering process of ceramics

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    Sintered mullite specimens

    Fig. 5. Sintered mullite specimens

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    Composites before and after post-processing and SEM image of composite interface. (a) Composite before post-processing; (b) composite after post-processing; (c) side view of composite specimen; (d) SEM image of composite interface

    Fig. 6. Composites before and after post-processing and SEM image of composite interface. (a) Composite before post-processing; (b) composite after post-processing; (c) side view of composite specimen; (d) SEM image of composite interface

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    • Table 1. Materials used in gelcasting process

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      Table 1. Materials used in gelcasting process

      MaterialApplicationPurity
      AcrylamideMonomerAnalytical reagent
      N, N'-methylene-bis-acrylamideCrosslinkerAnalytical reagent
      Sodium polyacrylateDispersantChemical pure
      Ammonium persulfateInitiatorAnalytical reagent
      TetraethylethylenediamineCatalystChemical pure
      Fused mullite powderCeramic powderIndustrial pure

    • Table 2. Properties of graphite preform under different post-processing

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      Table 2. Properties of graphite preform under different post-processing

      Post-processingDensity /(g·mL-1)Bendingstrength /MPaThermalconductivity /(W·m-1·K-1)
      None0.451.71.01
      Carbonization0.484.31.25
      Infiltrationwith silica sol0.8911.61.50
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    Haihua Wu, Yu Sun, Kui Chen, Yafeng Li. Fabrication of High Strength and Low Thermal Conductivity Graphite/Ceramic Composites by Selective Laser Sintering and Gelcasting[J]. Laser & Optoelectronics Progress, 2019, 56(9): 091404

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    Paper Information

    Category: Lasers and Laser Optics

    Received: Nov. 11, 2018

    Accepted: Dec. 6, 2018

    Published Online: Jul. 5, 2019

    The Author Email: Haihua Wu (wuhaihua@ctgu.edu.cn)

    DOI:10.3788/LOP56.091404

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology