超高温稀土硼化物(Y1-xYbx)B6的制备及力学性能研究

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (1): 276-286.

所属专题：陶瓷

超高温稀土硼化物(Y_1-xYb_x)B₆的制备及力学性能研究

刘虎林¹, 侯慧慧¹, 于成龙¹, 满振勇², 党锋珍¹, 薛云龙¹, 伍媛婷¹

1.陕西科技大学材料科学与工程学院,陕西省无机材料绿色制备与功能化重点实验室,西安 710021;
2.中国科学院上海硅酸盐研究所,高性能陶瓷和超微结构国家重点实验室,上海 200050

收稿日期:2022-07-01 修订日期:2022-09-26 出版日期:2023-01-15 发布日期:2023-02-15
作者简介:刘虎林(1988—),男,博士,副教授。主要从事先进结构陶瓷、固体废弃物利用的研究。E-mail:liuhulin@sust.edu.cn
基金资助:
国家自然科学基金(51702192);陕西省自然科学基金(2019JQ-451)

Preparation and Mechanical Properties of Ultra-High Temperature Rare Earth Boride (Y_1-xYb_x)B₆

LIU Hulin¹, HOU Huihui¹, YU Chenglong¹, MAN Zhenyong², DANG Fengzhen¹, XUE Yunlong¹, WU Yuanting¹

1. Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, School of Material Science & Engineering, Shaanxi University of Science & Technology, Xi’an 710021, China;
2. The State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics,Chinese Academy of Sciences, Shanghai 200050, China

Received:2022-07-01 Revised:2022-09-26 Online:2023-01-15 Published:2023-02-15

摘要/Abstract

摘要： 六硼化钇(YB₆)高温下结构不稳定限制了其在超高温领域的应用,通过引入Yb元素,可形成高温稳定的(Y_1-xYb_x)B₆固溶体。本文以(Y_0.5Yb_0.5)₂O₃和B₄C为原料采用硼/碳热还原法制备了(Y_0.5Yb_0.5)B₆粉体,通过无压烧结实现了陶瓷致密化,并结合密度泛函理论计算综合分析了材料的晶体结构、微观形貌和力学性能。结果表明,在1 650 ℃下热处理,B₄C过量6.25%时合成的(Y_0.5Yb_0.5)B₆粉体纯度最高。在2 000 ℃下无压烧结获得的(Y_0.5Yb_0.5)B₆陶瓷致密度为95.80%,但晶粒尺寸偏大,可达(80.71±35.51) μm。通过两步烧结法所得陶瓷致密度、晶粒尺寸、硬度和断裂韧性分别为95.47%、(14.54±6.31) μm、(14.53±1.37) GPa和(2.81±0.34) MPa·m^1/2。陶瓷断口处与典型的高损伤容限陶瓷Ti₃SiC₂、Hf₃AlN的断口形貌十分类似,表明(Y_0.5Yb_0.5)B₆具有良好的损伤容忍度,有望提高超高温陶瓷的韧性与延性。

关键词: 硼化钇, 超高温陶瓷, 硼/碳热还原法, 第一性原理计算, 损伤容忍度

Abstract: The structural instability of yttrium hexaboride (YB₆) at high temperature limits its application in the ultra-high temperature field. By introducing Yb element, high-temperature stable (Y_1-xYb_x)B₆ solid solution can be formed. In this paper, (Y_0.5Yb_0.5)B₆ powders were prepared via boron/carbon thermal reduction method using (Y_0.5Yb_0.5)₂O₃ and B₄C as raw materials, and the ceramics were densified by pressureless sintering. The crystal structure, microstructure and mechanical properties were investigated based on the experimental results and density functional theory calculations. The results show that the (Y_0.5Yb_0.5)B₆ powders synthesized at 1 650 ℃ have the highest purity when B₄C is excess by 6.25%. (Y_0.5Yb_0.5)B₆ ceramics have a relative density of 95.80% after pressureless sintered at 2 000 ℃, but the grains are coarse with the average size of (80.71±35.51) μm. The relative density, grain size, hardness and fracture toughness of ceramics obtained by two-step sinteringare 95.47%,(14.54±6.31) μm, (14.53±1.37) GPa and (2.81±0.34) MPa·m^1/2, respectively. The fracture morphology of ceramics is very similar to that of typical high damage tolerance ceramics Ti₃SiC₂ and Hf₃AlN, which indicates that (Y_0.5Yb_0.5)B₆ has good damage tolerance and is expected to improve the toughness and ductility of ultra-high temperature ceramics.

Key words: yttrium boride, ultra-high temperature ceramics, boron/carbon thermal reduction method, first principle calculation, damage tolerance

中图分类号:

TQ174

刘虎林, 侯慧慧, 于成龙, 满振勇, 党锋珍, 薛云龙, 伍媛婷. 超高温稀土硼化物(Y_1-xYb_x)B₆的制备及力学性能研究[J]. 硅酸盐通报, 2023, 42(1): 276-286.

LIU Hulin, HOU Huihui, YU Chenglong, MAN Zhenyong, DANG Fengzhen, XUE Yunlong, WU Yuanting. Preparation and Mechanical Properties of Ultra-High Temperature Rare Earth Boride (Y_1-xYb_x)B₆[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(1): 276-286.

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超高温稀土硼化物(Y_1-xYb_x)B₆的制备及力学性能研究

Preparation and Mechanical Properties of Ultra-High Temperature Rare Earth Boride (Y_1-xYb_x)B₆

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