对热压烧结原位制备的铁铬镍钴合金金属陶瓷的微观结构和腐蚀特性的评估

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

Ceramics International Pub Date : 2024-09-13 DOI:10.1016/j.ceramint.2024.09.147

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引用次数: 0

摘要

传统的硼化物金属陶瓷研究很少考虑其多种成分之间的协同作用对其微观结构和性能的影响。本研究首次采用热压烧结法制备了铁铬镍钴硼化物金属陶瓷。研究了烧结温度在 1000-1300 ℃ 范围内金属陶瓷的微观结构演变和耐腐蚀性能。结果表明，该金属相包括 Mo2FeB2、MoB2 和 FCC 相（包括铁铬镍钴相或铁铬镍钴分解形成的各种金属间固溶体）。由于吉布斯自由能较低，Mo2FeB2 属于硬相。铬原子溶入晶格并稳定 Mo2FeB2 晶体。硬质相中也存在一定量的 MoB2。结合相由合金元素和固溶体形成。在 1100 °C 下烧结的金属陶瓷结构缺陷最小，金属陶瓷含量最高，耐腐蚀性最好；孔隙率为 9.94%，金属陶瓷的相比率为 48.9%。金属陶瓷相的晶粒尺寸最小，为 5.96 μm。在 3.5% NaCl 溶液中的平衡电位（Ecorr）为 -0.52 V，腐蚀电流密度（Icorr）为 2.07 × 10-6 A/cm2，开路电位（OCP）为 -0.34 V。

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Evaluation on the microstructure and corrosion properties of in situ prepared FeCrNiCo-boride cermet by hot press sintering

Traditional studies on boride cermet have rarely considered the effects of the synergistic interactions among their multiple components on their microstructure and properties. In this study, FeCrNiCo-boride cermet is prepared for the first time via hot-press sintering. The microstructure evolution and corrosion resistance of the cermet are investigated for sintering temperatures in the range of 1000–1300 °C. The results show that the phase comprises Mo₂FeB₂, MoB₂, and FCC phases (including that of FeCrNiCo or various intermetallic solid solutions formed by FeCrNiCo decomposition). Owing to its low Gibbs free energy, Mo₂FeB₂ occurs in the hard phase. Cr atoms dissolve into the crystal lattice and stabilise the Mo₂FeB₂ crystals. A certain amount of MoB₂ is also present in the hard phase. The bond phase is formed by alloying elements and solid solutions. The cermet sintered at 1100 °C exhibits the least structural defects, highest cermet content, and best corrosion resistance; the porosity is 9.94 % and phase ratio of cermet is 48.9 %. The cermet phase has the smallest grain size of 5.96 μm. The equilibrium potential (E_corr) is −0.52 V, corrosion current density (I_corr) is 2.07 × 10⁻⁶ A/cm², and open-circuit potential (OCP) in a 3.5 % NaCl solution is −0.34 V.

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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.