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中南大学学报(自然科学版)

Journal of Central South University

第45卷    第8期    总第240期    2014年8月

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文章编号:1672-7207(2014)08-2589-07
添加Co, Ni和Mo对钛铁矿原位合成Al2O3-Ti(C,N)-Fe复合材料的影响
刘胜明,汤爱涛,赵子鹏

(重庆大学 材料科学与工程学院,重庆,400044)

摘 要: 在钛铁矿原位反应合成Al2O3-Ti(C,N)-Fe复合材料的基础上,添加Co,Ni和Mo来改善Al2O3-Ti(C,N)-Fe复合材料的性能。通过物相分析、扫描电镜和力学检测手段研究不同金属添加剂对合成产物物相、组织和性能的影响。研究结果表明:添加Co和Ni以后在烧结过程中分别形成了含Co和Ni的[Fe,Co]及[Fe,Ni]固溶相,材料的硬度有所降低,抗弯强度有所提高但提高的幅度不大。Mo的添加阻碍了Ti(C,N)相的长大,细化了Ti(C,N)晶粒;在烧结过程中生成的Mo2C包覆在Ti(C,N)相的周围,改善了Ti(C,N)相与Al2O3相和Fe相的润湿性,这同时导致了材料硬度和抗弯强度升高。当Mo添加量为8%时,烧结材料的力学性能最佳,抗弯强度和硬度分别为476 MPa和19.4 GPa。

 

关键词: Co;Ni;Mo;钛铁矿;Al2O3-Ti(C,N)-Fe;组织;力学性能

Influence of Co, Ni and Mo on microstructure and properties of Al2O3-Ti(C,N)-Fe composite by in-situ synthesis from ilmenite
LIU Shengming, TANG Aitao, ZHAO Zipeng

College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China

Abstract:Based on the of in-situ synthesis of Al2O3-Ti(C,N)-Fe composite from ilmenite, the elements Co, Ni and Mo were added to improve the properties of Al2O3-Ti(C,N)-Fe composite. The phase, microstructure and properties were investigated by using XRD, SEM and mechanical testing means. The results show that [Fe,Co] or [Fe,Ni] solid solution phases are formed during the sintering process by adding Co or Ni, respectively. The hardness of the material decreases and the bending strength increases slightly. The addition of Mo hampers the growth of Ti(C,N) phase and refines the Ti(C,N) grains. The Mo2C phase is formed during the sintering process and clad around the Ti(C,N) phase, which improves the wetting between Ti(C,N) and Al2O3 and Fe, and increases the materials hardness and bending strength. When Mo content is 8%, the sintered materials achieve the best mechanical properties, and the values of bending strength and Vickers hardness are 476 MPa and 19.4 GPa, respectively.

 

Key words: Co; Ni; Mo; ilmenite; Al2O3-Ti(C,N)-Fe; structure; mechanical properties

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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