B 4C@TiB 2芯壳单元增韧al2o3复合陶瓷的制备及增韧机理

IF 18.6 1区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS
Yingjie Shi, Weixing Li, Xiaorong Zhang, Jiachao Jin, Jilin Wang, Yu Dong, Jingbo Mu, Guangsuo Wang, Xiaoliang Zhang, Zhixiao Zhang
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引用次数: 0

摘要

本文提出了采用核壳结构单元作为二次相来增韧Al2O3陶瓷的概念。采用熔盐法和火花等离子烧结相结合的方法,成功制备了B4C@TiB2核壳单元增韧Al2O3复合陶瓷。B4C@TiB2核壳增韧单元的合成源于先前生产的核壳结构B4C@TiB2粉末,烧结后这种核壳结构有效地保留在Al2O3基体内。B4C@TiB2核壳增韧单元由一个微米大小的B4C核和一个约500纳米厚的壳组成,壳层由许多纳米大小的TiB2晶粒组成。这些核壳单元周围的区域呈现出独特的几何结构,并包含相组成、晶粒尺寸和热膨胀系数的多维变化。因此,复杂的应力分布出现,促进裂纹在多个维度上的扩展。这种行为消耗了大量的裂纹扩展能量,从而提高了Al2O3基体的断裂韧性。制备的Al2O3复合陶瓷的相对密度为99.7±0.2%,维氏硬度为21.5±0.8 GPa,断裂韧性为6.92±0.22 MPa·m1/2。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Preparation and toughening mechanism of Al 2O 3 composite ceramic toughened by B 4C@TiB 2 core&ndash;shell units
In this paper, the concept of incorporating core–shell structured units as secondary phases to toughen Al2O3 ceramics is proposed. An Al2O3 composite ceramic toughened by B4C@TiB2 core–shell units is successfully synthesized using a combination of molten salt methodology and spark plasma sintering. The synthesis of B4C@TiB2 core–shell toughening units stems from the prior production of core–shell structural B4C@TiB2 powders, and this core–shell structure is effectively preserved within the Al2O3 matrix after sintering. The B4C@TiB2 core–shell toughening unit consists of a micron-sized B4C core enclosed by a shell approximately 500 nm thick, composed of numerous nanosized TiB2 grains. The regions surrounding these core–shell units exhibit distinct geometric structures and encompass multidimensional variations in phase composition, grain dimensions, and thermal expansion coefficients. Consequently, intricate stress distributions emerge, fostering the propagation of cracks in multiple dimensions. This behavior consumes a considerable amount of crack propagation energy, thereby enhancing the fracture toughness of the Al2O3 matrix. The resulting Al2O3 composite ceramics displays a relative density of 99.7±0.2%, a Vickers hardness of 21.5±0.8 GPa, and a fracture toughness 6.92±0.22 MPa·m1/2.
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来源期刊
Journal of Advanced Ceramics
Journal of Advanced Ceramics MATERIALS SCIENCE, CERAMICS-
CiteScore
21.00
自引率
10.70%
发文量
290
审稿时长
14 days
期刊介绍: Journal of Advanced Ceramics is a single-blind peer-reviewed, open access international journal published on behalf of the State Key Laboratory of New Ceramics and Fine Processing (Tsinghua University, China) and the Advanced Ceramics Division of the Chinese Ceramic Society. Journal of Advanced Ceramics provides a forum for publishing original research papers, rapid communications, and commissioned reviews relating to advanced ceramic materials in the forms of particulates, dense or porous bodies, thin/thick films or coatings and laminated, graded and composite structures.
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