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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

Al对反应火焰喷涂TiC-TiB2复相陶瓷涂层的影响

王建江, 杜心康, 刘宏伟, 张龙, 陆大勤
  

  1. 军械工程学院先进材料研究所, 石家庄 050003
  • 收稿日期:2006-05-30 修回日期:2006-07-20 出版日期:2007-05-20 网络出版日期:2007-05-20

Influence of Al on Reactive Flame Sprayed TiC-TiB2 Multiphased Ceramic Coatings

WANG Jian-Jiang, DU Xin-Kang, LIU Hong-Wei, ZHANG Long, LU Da-Qin   

  1. Institute of Advanced Materials, Ordnance Engineering College, Shijiazhuang 050003, China
  • Received:2006-05-30 Revised:2006-07-20 Published:2007-05-20 Online:2007-05-20

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摘要： 通过静态燃烧合成试验, 确定以Ti-B4C-C+5wt%Al为喷涂反应体系, 利用反应火焰喷涂技术在金属表面制备Ti(C0.7, N0.3)-TiB2-Al2O3复相陶瓷涂层. 研究发现, 涂层为复相非均质层状亚稳结构, 由TiC0.7, N0.3、TiB2、Al2O3和钛的氧化物相及气孔组成. 涂层组织可分为三类: TiB2尺度在微-纳米级呈团簇状分布的Ti(C0.7, N0.3)-TiB2共晶体组织; Ti(C0.7, N0.3)呈块状颗粒、尺寸1～2μm、其间分布着针状或长条状TiB2的组织; 黑色不规则气孔. 三类组织的形成原因与不加Al时基本相同, 但Al的加入使喷涂体系的反应速率提高, 并使涂层陶瓷相增多, 组织细化, 气孔率下降, 显微硬度提高.

关键词: 反应火焰喷涂, TiC-TiB2-Al2O3, 复相陶瓷涂层, 组织结构

Abstract: By static combustion synthesis tests, Ti-B4C-C+5wt%Al was chosen as the reactive system to prepare the Ti(C0.7, N0.3)-TiB2- Al2O3 multiphased ceramic coatings on the metal substrate with a reactive flame spray technology. It is found that the coatings have the multiphased heterogeneous metastable structure, which consists of TiC0.7N0.3, TiB2, Al2O3, titanium oxide and some pores. The structure of the coatings can be divided into three kinds: the Tistructure with the cluster-shaped TiB2 in micron-nanometer size, the structure with mass-shaped 1--2μm Ti(C0.7, N0.3) particle surrounded by the needle-shaped or strip-shaped TiB2 and the black phase of anomalous pores. The forming causes of the three kinds of structure are the same as those of the coatings with no additive Al. However the additive Al raises the reaction velocity, so the amount of ceramic phase increases, the structure becomes fine, the pores reduce and the micro-hardness of the coatings is increased.

Key words: reactive flame spray, TiC-TiB2-Al2O3, multiphase ceramic coatings, structure

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