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The Research on the Producing and Mechanical Character of Laminated Ciramic

Author: RenQingWu
Tutor: WangGuoFeng
School: Harbin Institute of Technology
Course: Materials Processing Engineering
Keywords: Al2O3-Si3N4/ZrO2-Al2O3 layered ceramic ZrO2-Al2O3/Nb layered ceramic Hot pressing sintering Microstructure
CLC: TQ174.1
Type: Master's thesis
Year: 2009
Downloads: 64
Quote: 1
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Abstract


Ceramic Layered composite is inspired by the layered structure of the pearl mica, shells and other developed Toughening ceramics, ceramic materials research hotspot significant toughening effect. In this paper, the use of vacuum hot pressing sintering method were prepared Al 2 O 3 -Si 3 N 4 / ZrO < sub> 2 -Al 2 O 3 and the ZrO 2 -Al 2 O 3 / Nb the two ceramic grassroots-like composite material, the system studied Al 2 O 3 -Si 3 N 4 / ZrO 2 -Al 2 O 3 , and the ZrO 2 -Al 2 O 3 / Nb ceramic Layered composite materials preparation process, organization, performance, the relationship between In this paper, prepared by vacuum hot pressing sintering method Al 2 O 3 -Si 3 N 4 / ZrO 2 -Al 2 O 3 layered ceramic composite block, after the mechanical properties and microstructure analysis obtained at a temperature of 1550 ℃, pressure of 30MPa conditions, prepared Al 2 O 3 -Si 3 N 4 / ZrO 2 -Al 2 O 3 bulk material best overall performance. Density 4.28g/cm3, the density of up to 96%. Al 2 O 3 -Si 3 N 4 / ZrO 2 -Al < sub> 2 O 3 the laminated ceramics exhibit good mechanical properties, hot press sintering the bending strength of the specimen was 184MPa, and the fracture toughness of up to 5.2MPa? M1 / ??2, Al 2 O 3 -Si 3 N 4 layer and ZrO 2 -Al 2 O 3 layer has a Vickers hardness value respectively 16.95GPa 11.31GPa. Al 2 O 3 -Si 3 N 4 / ZrO 2 - Al 2 O 3 layered ceramic composite of three toughening mechanisms: crack deflection mechanism nanoparticles toughening residual stress toughening. In this paper, hot pressed sintering method were prepared the ZrO 2 -Al the 2 O 3 / Nb layered composite ceramic block, after the mechanical properties of test and microstructure analysis derived temperature of 1550 ° C and a pressure of 30MPa, the best overall performance. The bending strength of 245MPa, fracture toughness of 7.2 MPa? M1 / ??2. Al 2 O 3 -ZrO 2 layer and Nb layer Vickers hardness of the highest in the 1500 ℃, respectively 8.12GPa, 6.36 GPa. Analysis the ZrO 2 -Al 2 O 3 / Nb layered composite ceramic three kinds of crack expansion mode.

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CLC: > Industrial Technology > Chemical Industry > Silicate > Ceramic Industry > Basic theory
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