Powder processing and densification behaviour of alumina–high zirconia nanocomposites using chloride precursors
✍ Scribed by Raghunath P. Rana; Swadesh K. Pratihar; Santanu Bhattacharyya
- Publisher
- Elsevier Science
- Year
- 2007
- Tongue
- English
- Weight
- 248 KB
- Volume
- 190
- Category
- Article
- ISSN
- 0924-0136
No coin nor oath required. For personal study only.
✦ Synopsis
Al 2 O 3 -ZrO 2 composites having nominal equal volume fraction of Al 2 O 3 and ZrO 2 were prepared from gel-precipitated powder, precipitated powder and washed precipitated powder. These different processing routes affected the crystallization temperature of the amorphous powder as well as the phase evolution of Al 2 O 3 and ZrO 2 during calcination. The agglomerate size was largest for gel-precipitated powder (30 m) and it was smallest for washed precipitated powder (19 m). While gel-precipitated powder produce hard agglomerated powder (P j = 110 MPa), washed precipitated powder produce soft agglomerates with low agglomeration strength (P j = 70 MPa). Thus, washed precipitated powder could sinter to a high density at lower sintering temperature. The bending strength exhibits a semi logarithmic relationship with porosity. The hardness shows an increasing trend with sintering temperature.