Alumina developed by pre-gelling starch consolidation (PSC)

摘要

In this paper, pre-gelling starch was used to consolidate alumina-dense ceramic suspensions. The colloidal processing of the ceramic was prepared with alumina and commercial potato starch, and slips were prepared with 55 volpercent of solids and 0.5 wt.percent of starch. This small amount of starch was possible because of a previous pre-gelling starch treatment, resulting in more homogeneous suspensions and particles smaller than starch granules. Additionally, sucrose was also used as a dispersion aid. After sintering, the samples were analysed according to their mechanical properties. These processes produced ceramics with a 93percent relative density, 325 MPa flexural strength, and a Weibull module whose value was m = 10, maintaining the capacity of this process to produce complex geometric shaped ceramics.