Sintering activation energy MoSi2-WSi2-Si3N4 ceramic

3rd International Youth Scientific Forum with International Participation "New Materials"

Titov, D.D.^1 ; Lysenkov, A.S.^1 ; Kargin, Yu F.^1 ; Frolova, M.G.^1 ; Gorshkov, V.A.^2 ; Perevislov, S.N.^3

Baykov Institute of Metallurgy and Material Science RAS, Moscow, Russia^1

Institute of Structural Macrokinetic and Material Science RAS, Chernogolovka, Russia^2

Central Research Institute of Materials, St.-Petersburg, Russia^3

关键词: Composite ceramic;    Concentration rates;    Dilatometer test;    Dilatometric studies;    Kinetic analysis;    Sintering activation energy;    Sintering process;    Two-Stage Sintering;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/347/1/012024/pdf
DOI  :  10.1088/1757-899X/347/1/012024

来源: IOP

【 摘 要 】

The activation energy of sintering process was calculated based on dilatometric studies of shrinkage processes (Mo,W)Si2+ Si3N4composite ceramic. (Mo,W)Si2powders was obtained by solid-phase solutions of 70 wt% MoSi2and 30 wt% WSi2by SHS in the ISMAN RAS. The concentration rate Si3N4was from 1 to 15 wt.%. The sintering was carried out to 1850°C in Ar atmosphere the heating rate of 5, 10, 12 and 15°C/min by the way of dilatometer tests. Based on the differential kinetic analysis method (Friedman's method), the sintering process activation energy of (Mo,W)Si2+ Si3N4were calculated. The two-stage sintering process and the dependence of the activation energy on the Si3N4content was shown. Average value of 370 kJ/mol for Q was obtained.