Colloidal processing of Al2O3 and BST materials

Abstract

The paper presents the analysis of thermal stability and decomposition of Al 2 O 3 and (Ba,Sr)TiO 3 green bodies as well as commercially available organic additives which are used in shaping of ceramics by colloidal processing. The first analyzed ceramic material was Al 2 O 3 green body obtained by gelcasting. The second examined material was elastic ceramic-polymer composite based on ferroelectric powder Ba 0.8 Sr 0.2 TiO 3 with NiO obtained by tape casting method. This flexible and durable material is characterized by high value of dielectric constant and finds the application in devices operating at very high frequencies up to sub-THz. Most organic additives are indispensable just in forming step but must be then eliminated in order to obtain pure ceramic phase, additionally some of them have to be stable in a wide temperature range. The analyzed organic substances were as follows: 2-carboxyethyl acrylate, SYNTRAN 8250, DURAMAX D-3005, DURAMAX B-1000. The DTA/TG measurements coupled with mass spectrometry allowed to gain new knowledge concerning degradation of selected organic additives, thermal stability of ceramic-polymer composite and type of gases released from samples during thermal treatment.

Role of Surface-Chemistry in Colloidal Processing of Ceramics: A Review

“…Rheological and mechanical properties were further studied [76]. The thermal stability and degradation of Al 2 O 3 and (Ba,Sr)TiO 3 (BST), and other organic additives for ceramic manufacturing were observed by mass spectrometry and thermal gravimetric analysis [77].…”