Skip to main content

Effect of Aging Time on the Stability of Aqueous Y-α-SiAlON Precursor Powder Suspensions

Buy Article:

$51.00 plus tax (Refund Policy)

Abstract:

A temporarily stable aqueous slip of Y-α-SiAlON precursors powders (Si3N4, Al2O3, Y2O3, and AlN powders) was successfully prepared using an AlN powder thermo-chemically treated against hydrolysis (AlN-TC). Aqueous suspensions of AlN-TC and an Si3N4-based powders' mixture (Si3N4/Y2O3/Al2O3) proved to have long-term stability under separate deagglomeration by ball milling. However, the kinetic stability decreased when the two suspensions were mixed in the required proportion to obtain a precursor Y-α-SiAlON composition. This work aims at understanding better the aging phenomena and evaluating the feasibility of using aqueous processing to fabricate Y-α-SiAlON ceramics. The pH and rheological behavior of the suspensions were monitored along the time. The effects of drying conditions (room temperature or humidity-controlled chamber) of slip-cast samples on the crystalline phases and oxygen contents before and after sintering were evaluated. Drying under a moisture-rich atmosphere favored hydrolysis of AlN and the appearance of -SiAlON as the main phase after sintering. The results allowed concluding that there is a time frame within which Y-α-SiAlON ceramics can be fabricated from aqueous suspensions.

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1551-2916.2010.03621.x

Affiliations: 1: Department of Ceramics and Glass Engineering, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal 2: Department of Mechanical Engineering and Industrial Management, FEUP, University of Porto, Porto, Portugal

Publication date: June 1, 2010

bsc/jace/2010/00000093/00000006/art00025
dcterms_title,dcterms_description,pub_keyword
6
5
20
40
5

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more