Effect of Y2O3 addition on microstructure and mechanical properties of spark plasma sintered TiB2–20SiC–5Ni cermet

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

International Journal of Applied Ceramic Technology Pub Date : 2025-07-30 DOI:10.1111/ijac.70042

Xuemei Ouyang, Yuling Shi, Hongxian Chen, Weiwei Zhou, Xinming Wang

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Abstract

TiB₂–20SiC–5Ni cermets with Y₂O₃ additions ranging from 0 to 1 wt.% were processed via spark plasma sintering (SPS) at 1600°C. The influence of Y₂O₃ additives on the microstructure and composition of cermets was examined using X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The outcomes show that four phases (TiB₂, SiC, TiC, and Ni₂Si) and a characteristic core–rim structure of TiB₂ grains were found in the TiB₂-based cermets. The addition of Y₂O₃ promoted sintering densification, while the Y element showed regional enrichment, effectively inhibiting the overgrowth of the (Ti, W)(C, B)₂ rim phases and promoting TiC precipitation. The addition of Y₂O₃ has significantly improved the mechanical properties of TiB₂-based cermets. The Vickers hardness and fracture toughness of TiB₂–20SiC–5Ni–0.5Y₂O₃ cermet reached up to 16.17 ± 0.25 GPa and 8.2 ± 0.14 MPa m^1/2, individually. Transgranular fracture, deflection, and bridging of cracks were the causes attributed to the toughening mechanisms.

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添加Y2O3对放电等离子烧结TiB2-20SiC-5Ni陶瓷组织和力学性能的影响

采用火花等离子烧结（SPS）技术，在1600℃下制备了Y2O3添加量为0 ~ 1wt .%的TiB2-20SiC-5Ni陶瓷。采用x射线衍射（XRD）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）研究了Y2O3添加剂对陶瓷微观结构和组成的影响。结果表明，TiB2基陶瓷中存在TiB2、SiC、TiC和Ni2Si四种相，并具有典型的TiB2晶核-边缘结构。Y2O3的加入促进了烧结致密化，而Y元素呈现区域富集，有效抑制了（Ti， W）（C， B）2边缘相的过度生长，促进了TiC的析出。Y2O3的加入显著改善了tib2基陶瓷的力学性能。TiB2-20SiC-5Ni-0.5Y2O3陶瓷的维氏硬度和断裂韧性分别达到16.17±0.25 GPa和8.2±0.14 MPa m1/2。穿晶断裂、裂纹挠曲和裂纹桥接是由增韧机制引起的。

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来源期刊

International Journal of Applied Ceramic Technology 工程技术-材料科学：硅酸盐

CiteScore

3.90

自引率

9.50%

发文量

280

审稿时长

4.5 months

期刊介绍： The International Journal of Applied Ceramic Technology publishes cutting edge applied research and development work focused on commercialization of engineered ceramics, products and processes. The publication also explores the barriers to commercialization, design and testing, environmental health issues, international standardization activities, databases, and cost models. Designed to get high quality information to end-users quickly, the peer process is led by an editorial board of experts from industry, government, and universities. Each issue focuses on a high-interest, high-impact topic plus includes a range of papers detailing applications of ceramics. Papers on all aspects of applied ceramics are welcome including those in the following areas: Nanotechnology applications; Ceramic Armor; Ceramic and Technology for Energy Applications (e.g., Fuel Cells, Batteries, Solar, Thermoelectric, and HT Superconductors); Ceramic Matrix Composites; Functional Materials; Thermal and Environmental Barrier Coatings; Bioceramic Applications; Green Manufacturing; Ceramic Processing; Glass Technology; Fiber optics; Ceramics in Environmental Applications; Ceramics in Electronic, Photonic and Magnetic Applications;