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The Microstructure and Toughening-Strengthening Mechanism of the Al2O3-matrix Composite Ceramics

Author: LiHuaPing
Tutor: YangHaiTao
School: Wuhan University of Technology
Course: Materials Science
Keywords: Alumina Gas pressure sintering (GPS) Hot isostatic processing Microstructure Reinforcement toughening
CLC: TB333
Type: Master's thesis
Year: 2004
Downloads: 436
Quote: 5
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Abstract


Alumina-based ceramic material with excellent mechanical properties, its research has important implications for modern machining technology. This paper briefly describes the Al 2 O 3 -TiC composite ceramic tool study the latest development. The particle dispersion enhanced multiphase ceramic the material composite method is often used. Numerous studies show that: Ti (C, N), TiC or TiN as the second phase dispersion particles prepared alumina matrix composite ceramics the relative Al 2 O 3 single ceramics, the performance has been significantly improved ceramic performance of such multiphase excellent present study, the air pressure sintering (GPS) and GPS combined with hot isostatic pressing (HIP) has a wide range of applications in the field of mechanical processing after dealing with two prepared alumina matrix composite ceramics. Al 2 O 3 -TiCN system, densification process for solid-phase sintering mechanism; under conditions of high temperature and high pressure sintering, Al 2 O < sub> 3 with the reaction between the TiC were suppressed, and the decomposition reaction of TiCN in some extent be performed. Al 2 O 3 -TiC/TiN system densification process for the liquid phase sintering; Al 2 O 3 -TiC sintered body, stomata and abnormal growth of grains exists, leading Al 2 O 3 -TiC multiphase ceramics prepared unstable performance . HIP treatment, the performance of the material have been improved, in particular, can greatly improve the bending strength, strength dispersion decreased performance of the material tends to stable HIP treatment, the grain boundary enhanced under high temperature and pressure, fracture was a typical corroded row appearance, fracture grain boundaries become blurred. Fracture mode from intergranular fracture becomes transgranular fracture. The change in the way of the enhancement of the grain boundary and even fracture is the root cause of the improvement of the mechanical properties. Observed morphology and material characteristics of the grain boundary microstructure using scanning electron microscopy (SEM) and transmission electron microscopy (TEM), electron spectroscopy (EDS) and X-ray diffraction (XRD) analysis of the the material grain boundary phase composition. System to study the mechanical properties of alumina ceramic, morphology, grain boundary microstructure, and discuss the role of the additive components, material microstructure and mechanical properties of the relationship as well as the the material sintering mechanism and the impact of material structure and performance factor. This thesis explores the mechanism of strengthening and toughening of alumina matrix composite ceramics, experiments show that Al 2 O 3 -TiCN system mainly microcrack toughening. Finally, strengthening and toughening mechanism in theory Al 2 O 3 -TiN-ZrO 2 -MgO complex ceramics theoretical discussed. These basic research on optimization and stability in the preparation process, to obtain excellent performance of the ceramic material has a practical significance.

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Composite materials > Metal - non-metallic composite materials
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