4.7 Article

Fabrication, microstructure and mechanical properties of co-continuous TiCx/Cu-Cu4Ti composites prepared by pressureless-infiltration method

Journal

CERAMICS INTERNATIONAL
Volume 45, Issue 3, Pages 2932-2939

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2018.09.187

Keywords

TiCx; Pressureless infiltration; Porous preforms; Composites; Mechanical properties

Funding

  1. National Natural Science Foundation of China (NSFC) [51301013, 51572017, 51871011]
  2. Fundamental Research Funds for the Central Universities [2014JBZ015]
  3. Beijing Government Funds for the Constructive Project of Central Universities [353139535]

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The co-continuous TiCx/Cu-Cu4Ti composites were prepared by infiltrating melting Cu into TiC0.5 porous preforms. TiC0.5 porous preforms were firstly synthesized by in-situ solid reaction process using powder Ti and carbon black as the starting materials, PVB as shaping and pore-forming agent. The prepared TiC0.5 preforms showed 3D-connected visible pores characterized with two classes of sizes, i.e. intergranular pores with size of 10-30 mu m and intracrystalline pores with 2-3 mu m. Microstructure and phase compositions of the composites were detected by scanning electron microscopy (SEM) equipped with EDS and X-ray diffraction (XRD). Metal region of the composites contained Cu as well as a new phase Cu4Ti, which was formed by reaction of Cu and TiC0.5. Composites prepared by this method had a compact structure and strong interface. Meanwhile, metal phase and ceramic phase maintained a co-continuous structure in three dimensions. Cu-Cu4Ti entered into the TiCx ceramic particles like root structure during the infiltration process. Flexural strength, fracture toughness and Vickers hardness of the composites reached 948.20 +/- 124.04 MPa, 12.62 +/- 0.37 MN m(-3/2) and 606.4 +/- 36.7 respectively when content of TiCx was 71.22 vol%.

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