Residual carbon control and optimization of near-stoichiometric SiC-HfC nanocomposite fibers with high-temperature creep resistance

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2025-09-01 DOI:10.1016/j.ceramint.2025.06.223

Seong-Gun Bae , Yoonjoo Lee , Dong-Geun Shin

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Abstract

The increasing demand for improving high temperature performance of SiC fibers due to the application of high-temperature ceramic fiber composites (CMCs) for aerospace and nuclear power applications, including next-generation turbine engines, rocket nozzles, and nuclear fusion reactors inspired us to investigate for improving the high-temperature creep properties of SiC fibers and conducted research on the second phase strengthening on SiC fiber using hafnium carbide nanoparticles. Here, SiC-HfC nanocomposite fibers prepared using the polymer derived ceramic (PDC) method were difficult to densify due to residual carbon during the sintering process, so it was necessary to remove residual carbon. The fibers were first heat-treated at an intermediate temperature of 1500–1600 °C, then subjected to an oxidation process at 600–800 °C to finally induce dense sintering. The excess carbon was eliminated via reaction with oxygen, producing CO(g) and CO2(g). The near-stoichiometric SiC-HfC nanocomposite fibers' microstructure was more densified under each condition. Through this, it was confirmed that the high-temperature creep resistance of the SiC-HfC nanocomposite fibers was improved.

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耐高温蠕变SiC-HfC纳米复合纤维的残碳控制与优化

由于高温陶瓷纤维复合材料（cmc）在航空航天和核电领域的应用，包括下一代涡轮发动机、火箭喷嘴和核聚变反应堆，对改善SiC纤维高温蠕变性能的需求日益增加，激发了我们对改善SiC纤维高温蠕变性能的研究，并进行了碳化铪纳米颗粒对SiC纤维的第二相强化研究。本文采用聚合物衍生陶瓷（polymer derived ceramic， PDC）法制备的SiC-HfC纳米复合纤维由于在烧结过程中存在残余碳而难以致密化，因此需要去除残余碳。纤维首先在1500-1600℃的中间温度下进行热处理，然后在600-800℃的氧化过程中进行致密烧结。多余的碳通过与氧的反应被消除，产生CO(g)和CO2(g)。近化学计量的SiC-HfC纳米复合纤维的微观结构在各条件下都更加致密。通过实验证实，SiC-HfC纳米复合纤维的高温抗蠕变性能得到了提高。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.