东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2009, Vol. 30 ›› Issue (11): 1590-1593+1597.DOI: -

• 论著 • 上一篇    下一篇

B_4C-ZrB_2-Al复合材料的真空熔渗法制备与性能分析

吕鹏;岳新艳;喻亮;茹红强;   

  1. 东北大学材料各向异性与织构教育部重点实验室;
  • 收稿日期:2013-06-22 修回日期:2013-06-22 出版日期:2009-11-15 发布日期:2013-06-22
  • 通讯作者: Ru, H.-Q.
  • 作者简介:-
  • 基金资助:
    国家自然科学基金资助项目(50372010)

Phase composition and mechanical properties of B4C-ZrB2-Al composites prepared by vacuum infiltration

Lü, Peng (1); Yue, Xin-Yan (1); Yu, Liang (1); Ru, Hong-Qiang (1)   

  1. (1) Key Laboratory of Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang 110004, China
  • Received:2013-06-22 Revised:2013-06-22 Online:2009-11-15 Published:2013-06-22
  • Contact: Ru, H.-Q.
  • About author:-
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摘要： 通过在B4C-ZrB2多孔预烧体中真空熔渗Al制备了B4C-ZrB2-Al复合材料,研究了该复合材料的物相组成和力学性能.结果表明:ZrB2的生成量影响B4C-ZrB2-Al复合材料的物相组成;随着ZrB2生成量的增加,复合材料的硬度先增大后降低,抗折强度和断裂韧性先降低后增大;延性Al的渗入是造成材料断裂韧性提高的主要原因.当ZrB2生成量为35%(质量分数)时,复合材料主要由B4C,ZrB2和Al组成,其气孔率、硬度HRA、抗折强度和断裂韧性分别为1.06%,82.2,521.5MPa和8.6MPa.m1/2.观察材料断口形貌可见较多的韧窝和金属撕裂棱,表明其断裂行为主要为沿晶和穿晶混合断...

关键词: 复合材料, B_4C-ZrB_2-Al, 真空熔渗, 物相组成, 力学性能

Abstract: B4C-ZrB2-Al composites were prepared by infiltrating aluminum into the porous B4C-ZrB2 presintered compacts in vacuum. The phase composition and mechanical properties of the composites were investigated. The results showed that the phase composition of the composites changes with increasing ZrB2 content, and their hardness increases first then decreases but, on the contrary, the flexural strength and fracture toughness decrease first then increase with increasing ZrB2 content. The reason why the fracture toughness increases is mainly the infiltration of ductile aluminum. The B4C-ZrB2-Al composite is mainly composed of the phases B4C, ZrB2 and Al if the content of ZrB2 is 35wt%, i.e., its mechanical properties are optimum: the porosity, hardness (HRA), flexural strength and fracture toughness are 1.06%, 82.2, 521.5 MPa and 8.6 MPa · m1/2, respectively. A number of tearing ridges and dimples are found morphologically on the fracture surface, which reveal that the failure of the composite is mainly due to the intergranular and transgranular fracture.

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