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Paper Information

Journal:   INTERNATIONAL JOURNAL OF INDUSTRIAL ENGINEERING AND PRODUCTION MANAGEMENT (IJIE) (INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE) (PERSIAN)   SUMMER 2003 , Volume 14 , Number 2; Page(s) 1 To 2.
 
Paper: 

OPTIMIZED MICROSTRUCTURE OF NON-OXIDE CERAMICS OBTAINED BY DIFFERENT ROUTES AND THEIR CORRESPONDING MECANICAL PROPERTIES

 
 
Author(s):  KALANTAR M.*, FANTOZZI G.
 
* Yazd University, Yazd-Iran
 
Abstract: 
The mechanical properties of sintered materials are mainly controlled by the amount and morphology as average aspect ratio and the overall grain size of the #b phase for sintered Si3N4 at room temperature. The both densification and microstructure are strongly influenced by the properties of the starting powder (powder activity, phase composition, impurity content and particle morphology), type, amount and composition of additives, forming techniques and the processing parameters (temperature, soaking time, sintering atmosphere, nature and magnitude of pressure), which are mainly determined by the manufacturing technique. Therefore, we have elaborated different materials by changing the above parameters. Then we have studied the development microstructure in relation with mechanical properties. The samples obtained by hot pressing or pressure less sintering generally have a structure of the elongated #b-grains with aspect ratio of between 4 and 10 and the grain size of 0,2-0,9,#mm according to the conditions of manufacturing techniques. The high aspect ratio and the optimal grain size are made a significant increase of the mechanical properties of dense Si3 N4 materials at room temperature both in flexural strength and in fracture toughness, which are necessary for special applications.
 
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