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2010 , Vol. 25 >Issue 1: 87 - 90

DOI: https://doi.org/10.3724/SP.J.1077.2010.00087

研究论文

纳米/微米CaB6烧结体的形貌组织和力学性能

  • 张 琳 ,
  • 闵光辉 ,
  • 于化顺
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  • (山东大学 1. 材料液固结构演变与加工教育部重点实验室; 2．机械工程博士后科研流动站, 济南 250061)

收稿日期: 2009-04-27

  修回日期: 2009-06-30

  网络出版日期: 2010-01-24

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Morphology Characteristics and Mechanical Properties of Nano/Micron Calcium Hexaboride Sintered Body

  • ZHANG Lin ,
  • MIN Guang-Hui ,
  • YU Hua-Shun
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  • (1. Key Laboratory for LiquidSolid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan 250061, China; 2. Mechanical Engineering Postdoctoral Research Station, Shandong University, Jinan250061, China)

Received date: 2009-04-27

  Revised date: 2009-06-30

  Online published: 2010-01-24

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摘要

采用真空热压工艺, 在烧结温度1750℃、烧结压力32MPa、保温时间5min的工艺条件下制备了添加不同量纳米六硼化钙（CaB6）粉末的微米烧结体, 研究了纳米粒子含量对CaB6烧结体形貌组织和力学性能的影响. 纳米粉末加入量为10wt%纳米/微米复合陶瓷的致密度和力学性能最佳, 硬度、弯曲强度和断裂韧性分别为92.6 HRA、331.7MPa和3.06MPa·m1/2, 优于微米烧结体和添加镍作为烧结助剂的烧结体. 纳米粒子对微米颗粒晶界的填充和在复合烧结体中形成的“内晶型”晶粒结构是提高复合陶瓷致密度和力学性能的主要原因.

关键词： 六硼化钙; 纳米/微米复合陶瓷; 真空热压烧结; 内晶型; 力学性能

本文引用格式

张 琳 , 闵光辉 , 于化顺 . 纳米/微米CaB6烧结体的形貌组织和力学性能[J]. 无机材料学报, 2010 , 25(1) : 87 -90 . DOI: 10.3724/SP.J.1077.2010.00087

Abstract

Nano/Micron Calcium Hexaboride (CaB6) composite ceramics with different CaB6 nanopowder additions were prepared under 1750℃, 32MPa for 5min in vacuum. Influences of CaB6 nanopowders on morphology and mechanical properties of sintered bodies were investigated. Composite ceramic with 10wt% CaB6 nanopowder addition has the highest compactness degree and mechanical properties, whose hardness, bending strength and fractural toughness are 92.6 HRA, 331.7MPa and 3.06MPa·m1/2, respectively, better than those of CaB6 ceramics without nanopowder adding or those of reinforced by Ni as sintering additive. The proper amount of nano-particles filled in the micron grain boundaries and the formation of “inner crystal” result in the improvement of compactness and mechanical properties for the CaB6 sintered body.

Key words： calcium hexaboride; nano/micron composite ceramic; vacuum hot-pressing; intragranular structure; mechanical property

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