An Optimization of Particle Size and Additives of Slip Cast Alumina Samples to Reduce Warpage and Porosity

Abstract

Alumina body densification using slip casting was investigated with low warpage rates. In order to optimize slurry and sintering, 1600°C has been used. As a starting material, three types of alumina were used. Alumina has been used in conjunction with PMAA, and carboxymethyl cellulose in order to prepare the slurry. It was found that warpage rates were reduced when coarser particles were included in the composition. An acid treatment of the slurry was carried out in order to improve densification of the alumina body and to reduce warpage. This study examines the microstructure of a sintered alumina body. In the investigation, it was found that preparing a dense product reduced porosity and warping rate by 1.1% and 4%, respectively.

Effect of laser power and heat treatment on microstructures and tensile properties of LPBF fabricated Hastelloy X superalloy

“…However, as a rapid prototyping method, the small molten pools and the extremely fast cooling rate contribute to the nonuniform temperature field and steep temperature gradient during LPBF process, and the ensuing large thermal stress leads to the tendency of thermal cracking and deformation in the formed parts [6,7]. The problems such as microstructure inhomogeneity, solidification defects and anisotropy in mechanical properties hinder the practical applications [8][9][10]. It is known that the energy density of heat input has a crucial effect on the quality of the formed parts since they determine the heating/cooling rate, the thermal history and the shape of melt pool.…”