Structure and properties of high-strength HPHT sintered carbon-graphite blocks

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.2025.06.197

Houzhen Chen , Fuming Deng , Xiaotian Xing , Xiaozhou Chen , Ziyi Liu , Wenli Deng , Junzhe Yu , Can Li , Zhangjie Ye , Yonghai Lai , Bao Lv

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引用次数: 0

Abstract

In this study, the synergistic mechanism of pressure, temperature, and high-pressure high-temperature (HPHT) sintering time on the structural evolution and mechanical properties of carbon-graphite materials was systematically investigated through orthogonal experimental Design. Combined with XRD, Raman, TEM, mechanical characterization, and finite element analysis, it is found that: the pressure field inside the synthesis cavity exhibits relatively uniform distribution, and the temperature field is symmetrically distributed with an axial or radial gradient, which is much lower than that required for traditional isostatic graphitization; the pressure-driven transformation of the disordered structure in the samples to the ordered graphite lattice structure can occur rapidly, and the higher energy input can drive the rapid rearrangement of the carbon atom layers to optimize the intra-layer bonding and inter-layer stacking through the interplay of the high synthesis power and the short HPHT sintering time. The microhardness (1.77 GPa), compressive strength (192 MPa), and flexural strength (87 MPa) were synergistically strengthened at 2.9 GPa/1300 °C/90min, showing a d₀₀₂ spacing close to that of ideal single-crystal graphite. With further increase in pressure and time, the internal polycrystalline graphite structure was formed, and the compressive strength was significantly increased due to the reinforcement of interlayer interaction.

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高强度高温高温烧结碳-石墨块的结构与性能

本研究通过正交实验设计，系统研究了压力、温度和高压高温（HPHT）烧结时间对碳-石墨材料结构演变和力学性能的协同作用机制。结合XRD、Raman、TEM、力学表征和有限元分析发现：合成腔内压力场分布较为均匀，温度场呈轴向或径向梯度对称分布，远低于传统等静压石墨化的要求；在压力驱动下，样品中的无序结构可以迅速转变为有序的石墨晶格结构，较高的能量输入可以通过高合成功率和短高温高温烧结时间的相互作用，驱动碳原子层的快速重排，优化层内键合和层间堆叠。在2.9 GPa/1300℃/90min条件下，石墨的显微硬度（1.77 GPa）、抗压强度（192 MPa）和抗弯强度（87 MPa）协同增强，d002间距接近理想单晶石墨。随着压力和时间的进一步增加，内部形成石墨多晶结构，层间相互作用增强，抗压强度显著提高。

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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.