Vol.2, No 7, 1997 pp. 223 - 239
UDC 519.711:519.872:622.785:542.6 (Invited Paper)
MODELING AND COMPUTER SIMULATION OF DIFFUSION
PROCESS DURING LIQUID PHASE SINTERING
Zoran S. Nikolić1,
Momčilo M. Ristić2
1Faculty
of Electronic Engineering, Department of Microelectronics
University of Niš, PO Box 73, 18000 Niš, Yugoslavia
2Serbian
Academy of Sciences and Arts, Joint Laboratory for Advanced Materials
Knez Mihailova 35, 11000 Belgrade, Yugoslavia
Abstract. Liquid phase sintering is widely used for consolidation
of materials. Low sintering temperatures, relatively fast densification
and homogenization, and high final densities are the main advantages of
this production method. A very interesting approach to better understanding
of its extreme complexity due to the simultaneous and successive action
of numerous elemental mechanisms would be the determination of the qualitative
and quantitative effects from the stand-point of the process modeling and
simulation. In that sense, this paper outlines a computer-based method
for simulation of diffusion process and boundary migration on liquid/solid
interfaces during liquid phase sintering This results could be especially
of interest in an building a computer aided design system, which introduces
a new way of investigation: developing a new engineering design on the
basis of theoretical knowledge, experimental experience, process modeling
and process simulation.
MODELOVANJE
I SIMULACIJA PROCESA DIFUZIJE TOKOM SINTEROVANJA U PRISUSTVU TEČNE FAZE
Sinterovanje u prisustvu tečne faze predstavlja
tipičan proces za konsolidaciju materijala. Glavne karakteristike ovog
procesa su niža temperatura sinterovanja, relativno brzo skupljanje i homogenizacija
i velika gustina dobijenog materijala. Posebno interesantan pristup boljem
razumevanju izuzetne složenosti ovog procesa, koja je posledica simultanog
i sukcesivnog delovanja niza elementarnih mehanizama, predstavlja odredjivanje
kvalitativnih i kvantitativnih efekata procesa primenom metoda modelovanja
i simulacije. U tom smislu, u ovom radu je razvijen fizički i numerički
model simulacije procesa difuzije i pomeranja granice medjupovršine tečno/čvrsto
tokom sinterovanja u prisustvu tečne faze. Ovi modeli mogu biti deo složenog
sistema za planiranje i projektovanje procesa, s obzirom da uvode nov način
projektovanja procesa na osnovu postojećih teorijskih znanja, eksperimentalnih
rezultata i rezultata modelovanja i simulacije procesa.
