• CN:11-2187/TH
  • ISSN:0577-6686

›› 2007, Vol. 43 ›› Issue (5): 182-186.

• 论文 • 上一篇    下一篇

La2O3对电火花沉积TiC4涂层微观结构及抗磨性能的影响

程西云;石磊   

  1. 汕头大学工学院
  • 发布日期:2007-05-15

INFLUENCE OF La2O3 ON TRIBOLOGI-CAL PROPERTIES AND MICROSTRUC-TURE OF TiC4 CERAMIC LAYER BY ELECTRODEPOSITING

CHENG Xiyun;SHI Lei   

  1. Engineering College, Shantou University,
  • Published:2007-05-15

摘要: 探讨电火花加工方法制作TiC4陶瓷涂层工艺,制作表面改性用电极,分析电极参数及加工工艺参数对涂层性能的影响,在45钢基体上制作了TiC4陶瓷及稀土氧化镧改性的陶瓷涂层。用X射线衍射仪(X-ray diffractometer, XRD)、分析型扫描电镜(Analysis scanning electron microscope, ASEM)对涂层组成、组织形态进行分析,并在HQ-1型摩擦磨损试验机上对涂层摩擦学性能进行研究。结果表明:利用电火花沉积工艺可在钢基体上制作TiC4陶瓷涂层,电极中加入适量氧化镧对涂层组织有改善作用,稀土的加入使得涂层组织缺陷减少,涂层的致密度得到提高;当稀土氧化镧的添加质量分数为0.5%时,涂层的耐磨性能提高了3倍,摩擦因数降低了10%;添加过多的稀土对改善陶瓷涂层性能反而不利,涂层的组织缺陷增加,表面粗糙度也随之增大,耐磨性能降低。

关键词: 表面改性, 电沉积工艺, 陶瓷涂层, 稀土

Abstract: The method of electrical discharge coating with TiC4 ceramic layer in ordinary electrical discharge machining (EDM) tool is studied. TiC4 ceramic layer is deposited on 45 carbon steel substrate by EDM technique. TiC4 ceramic coatings with different contents of lanthanum are fabricated on a 45 carbon steel substrate. The clad coatings are examined and tested for microstructural features, chemical compositions, phase struc-ture, friction and wear properties by scanning electron micro-scope (SEM), X-ray diffraction (XRD) analysis, hardness tester, block-on-ring friction and wear tester separately. Experimental results show the TiC4 ceramic coating can be deposited on sur-face of carbon steel substrate, and the electrode mix into rare earth lanthanum oxide helps to enhance the density of coating, and the coating’s wear resistance can be increased, when the content of lanthanum oxide increases to 0.5%, the clad coating shows the best anti-wear ability, wear resistance can be in-creased by three times, and the wear coefficient can be de-creased by 10%. When the clad coating’s surface doped with excessive La2O3, it is found that there are many minute holes and long flaws cross specimen’s surface, and the clad coating’s surface roughness increases, wear resistance properties of the cladding layer declines quickly.

Key words: Rare earths, Ceramic coating Surface modification, Electrodeposition technology

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