具有不同微观结构的多相陶瓷颗粒增强 TiAl 复合材料的高温氧化行为

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2024-09-24 DOI:10.1016/j.ceramint.2024.09.306

Genhua Zeng , Tengfei Ma , Yupeng Wang , Xiaohong Wang , Hongze Fang , Ruirun Chen

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引用次数: 0

摘要

研究了具有不同微观结构的多相陶瓷颗粒增强 TiAl 复合材料的高温氧化行为。在Ti-48-Al-2Nb-2Cr中引入0.5 wt%的氧化石墨烯和0.3 wt%的SiC，通过火花等离子烧结制备了TiAl复合材料。在 1200、1250 和 1300 °C 下烧结分别获得了接近γ等轴的微观结构、双相微观结构和近乎完全片状的微观结构。此外，多相陶瓷颗粒均匀地分布在钛铝基体中。在 950 ℃ 的空气中循环氧化 100 小时后，具有近全片状微结构的 TiAl 复合材料表现出最佳的抗氧化性（质量增益为 1.83 mg/cm2），而具有近γ 微结构的 TiAl 复合材料表现出最差的抗氧化性（2.47 mg/cm2）。具有近完全层状微观结构的 TiAl 复合材料具有较好的抗氧化性，这归因于在 α2/γ 层状界面上均匀分布的 Ti2AlC 颗粒和在层状菌落边界上均匀分布的 Ti5Si3 颗粒阻碍了原子扩散。此外，α2/γ薄片菌落还有助于在氧化层和基底界面形成富含 Nb 和 Cr 的相，从而起到防止原子扩散的保护作用。

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High-temperature oxidation behavior of multi-phase ceramic particles-reinforced TiAl composites with different microstructures

The high-temperature oxidation behaviors of multiphase ceramic particle-reinforced TiAl composites with different microstructures were investigated. The TiAl composites were prepared via spark plasma sintering by introducing 0.5 wt % graphene oxide and 0.3 wt% SiC into Ti-48Al-2Nb-2Cr. The near-γ equiaxed microstructure, dual-phase microstructure, and nearly fully lamellar microstructure were obtained by sintering at 1200, 1250, and 1300 °C, respectively. Moreover, multiphase ceramic particles were uniformly distributed in the TiAl matrix. Cyclic oxidation was conducted at 950 °C in air for 100 h. The TiAl composite with the nearly fully lamellar microstructure exhibited the best oxidation resistance (mass gain of 1.83 mg/cm²) and that with the near-γ microstructure exhibited the worst oxidation resistance (2.47 mg/cm²). The superior oxidation resistance of the TiAl composite with the nearly fully lamellar microstructure is attributed to the uniform distributions of Ti₂AlC particles at the α₂/γ lamellae interfaces and Ti₅Si₃ particles at the lamellae colony boundaries, which hinder atomic diffusion. Moreover, the α₂/γ lamellae colonies facilitate the formation of Nb-rich and Cr-rich phases at the interface of the oxide layer and substrate, which act as a protective barrier against atomic diffusion.

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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.