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SUN Yongli, YU Zhaoyang, SHI Ranfeng, et al. FRACTAL CHARACTERISTIC OF MICROSTRUCTURE OF WC, ZrO2, Cr2O3AND Al2O3 CERAMIC PARTICLES/ NICKEL ALLOY COMPOSITE COATINGS[J]. Acta Materiae Compositae Sinica, 2005, 22(3): 85-91.
Citation: SUN Yongli, YU Zhaoyang, SHI Ranfeng, et al. FRACTAL CHARACTERISTIC OF MICROSTRUCTURE OF WC, ZrO2, Cr2O3AND Al2O3 CERAMIC PARTICLES/ NICKEL ALLOY COMPOSITE COATINGS[J]. Acta Materiae Compositae Sinica, 2005, 22(3): 85-91.
shu

FRACTAL CHARACTERISTIC OF MICROSTRUCTURE OF WC, ZrO2, Cr2O3AND Al2O3 CERAMIC PARTICLES/ NICKEL ALLOY COMPOSITE COATINGS

  • 1.

    Department of Power Engineering, Harbin Institute of Technology, Harbin 150001, China;

  • 2.

    Harbin Boiler Company Ltd., Harbin 150046, China

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  • Received Date: June 06, 2004
  • Revised Date: December 08, 2004
    Abstract
  • Four kinds of WC, ZrO2, Cr2O3 and Al2O3 ceramic particles/ nickel alloy composite coatings were prepared with the plasma spraying method. The X-ray diff raction analysis was used to investigate the phase constituentof ceramic particles in composite coatings. The hardness of the ceramic particles/ nickel alloy composite coating wasmeasured by the Leeb hardness tester. The properties of bend breaking of composite coatings were measured usingCSS-1110 elect ric all-purpose test meter. The micro-st ructures of composite coatings were t reated as a binarizationaf ter morphological processing. The f ractal dimensions of the ceramic particles/ nickel alloy composite coatings withdifferent volume f ractions of particles were obtained by means of the Sandbox method. Experimental result s indicatethat the dist ributions of ceramic particles in metal mat rix have a f ractal characteristic. The f ractal dimensions increase with the increase of particle volume f ractions. The dimensions are irrelative with the kinds of ceramic particles. The hardness and dimension of composite coatings increase with the decrease of diameter of ceramic particles.The bending f racture angles decrease with the increase of dimensions of ceramic particles/ nickel alloy compositecoatings.
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