Conferences

Low-Temperature Synthesis of α-Al2O3

  
V.Tzukrenko,
   
V.Vereschaka
 

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Krzhizhanovsky str., 3, Kyiv, 03142, Ukraine
Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2015, #07/08
http://www.materials.kiev.ua/article/1973

Abstract

The γ-Al2O3 → α-Al2O3 low-temperature phase transformation in the γ-Al2O3 powder for chromatography with АlF3 mineralizer is examined. It is shown that changes in the amount of АlF3 (2–3 wt.%) and isothermal holding time at 850 ºC allow variation in the powder phase composition, specific surface area (from 85.5 to 0.2 m2/g), and morphology (from spheroids to plates). The experimental results serve as a basis for designing precipitation-strengthened composites consisting of a ZrO2 solid solution matrix and an α-Al2O3 strengthening phase.


α-AL2O3, γ-AL2O3, LOW-TEMPERATURE PHASE TRANSFORMATION, ZRO2–Y2O3–CEO2–AL2O3–СОО SYSTEM, АLF3