Different LPS-SiC were produced by pressureless sintering in argon atmosphere, starting from different powders: either alfa-SiC or Beta-SiC or mixtures of alfa and beta-SiC, using the same sintering aid system (Y2O3+Al2O3). The green densities and the densities after various sintering tests (Temperature range from 1850 to 1900° and holding time 1-2 hours) were related to the powder characteristics and to the processing conditions. The microstructure of materials from alfa-SiC powder is generally equiaxed and fine (grain size from 0.5 to 3.5 μm), while the use of beta-SiC powder favours the development of elongated grains (up to 7 μm) with a mean aspect ratio of about 4. It is possible to tailor morphology and grain size with a proper selection of powder mixtures alfa/beta-SiC. Mechanical properties were evaluated on selected samples.

Microstructure design of liquid phase sintered silicon carbide in function of the powders characteristics

BALBO, Andrea;
2004

Abstract

Different LPS-SiC were produced by pressureless sintering in argon atmosphere, starting from different powders: either alfa-SiC or Beta-SiC or mixtures of alfa and beta-SiC, using the same sintering aid system (Y2O3+Al2O3). The green densities and the densities after various sintering tests (Temperature range from 1850 to 1900° and holding time 1-2 hours) were related to the powder characteristics and to the processing conditions. The microstructure of materials from alfa-SiC powder is generally equiaxed and fine (grain size from 0.5 to 3.5 μm), while the use of beta-SiC powder favours the development of elongated grains (up to 7 μm) with a mean aspect ratio of about 4. It is possible to tailor morphology and grain size with a proper selection of powder mixtures alfa/beta-SiC. Mechanical properties were evaluated on selected samples.
silicon carbide; sintering; microstructure; mechanical properties
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11392/532681
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 4
  • ???jsp.display-item.citation.isi??? 4
social impact