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预碳化玻璃碳中的洞和裂的演变

Yi Yang¹, Wei Wang¹, Haihui Ruan¹

¹Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong.

Materials (Basel, Switzerland)

|November 9, 2024

概括

在400°C以下形成的预碳化玻璃碳 (PGC) 提供了密集,无裂纹的微观结构. 这种PGC材料具有出色的机械强度和热稳定性,非常适合用于高温应用和模具制造.

科学领域:

材料科学材料科学材料科学
陶工程陶工程陶工程
高温材料高温材料

背景情况:

玻璃碳是一种类似陶的碳质材料,为电化学和制造业的应用提供高温稳定性.
大量前体的直接热解通常会导致内部孔隙和裂,导致材料断裂.

研究的目的:

在较低的热解温度下研究无裂纹玻璃碳的形成.
描述预碳化玻璃碳 (PGC) 的热力学性能,用于高温应用.

主要方法:

在低于400°C的温度下,玻璃碳前体的热解.
微观结构分析以识别毛孔和裂.
机械测试,以确定压力和屈曲强度.
热分析以评估质量损失和热膨胀.

主要成果:

在350°C形成的预碳化玻璃碳 (PGC) 呈现出密集的微观结构,没有内部毛孔或裂.
PGC-350具有很高的压力强度 (~370 MPa) 和屈曲强度 (~190 MPa).
该材料在重新加热到350°C时显示了最小的质量损失 (~5%) 和低热膨胀 (2.5 × 10-6/°C).

结论:

在350°C形成的PGC具有优越的热力学性能,适合承载应用.
开发的PGC材料显示出用于高温应用的潜力,包括用于压制石化玻璃的模具制造.
使用PGC模具实现了各种表面形态的有利成型结果.

关键词:

标志性特征的描述.模具应用程序模具应用程序甲树脂甲树脂预碳化玻璃碳的预碳化玻璃碳热解是一种热解过程.

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