Low - Temperature Sintering of Porous Ceramics via Sodium Borate Addition | Zendy

Ayşe Kalemtaş | Zendy

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Low - Temperature Sintering of Porous Ceramics via Sodium Borate Addition

Author(s) -

Ayşe Kalemtaş

Publication year - 2019

Publication title -

material science research india

Language(s) - English

Resource type - Journals

eISSN - 2394-0565

pISSN - 0973-3469

DOI - 10.13005/msri/160107

Subject(s) - borax , sintering , materials science , ceramic , porosity , scanning electron microscope , boron , composite material , chemistry , raw material , organic chemistry

In the current study, sodium borate-bonded highly open porous ceramics successfully produced by starch consolidation technique. Open porous ceramic production was carried out by using an economical grade a-Si3N4, corn starch, CC31 commercial-grade kaolin, and borax decahydrate (Na2B4O7.10H2O). Borax decahydrate was used as a sintering aid in the system and total ceramic (a-Si3N4 + CC31): borax decahydrate ratio was kept constant at 5:1. Sintering studies of the shaped samples carried out in an air atmosphere at a relatively low sintering temperature, 1100°C, for one hour. Scanning electron microscopy investigations of the porous ceramic samples revealed that due to the high amount of borax based sintering additive a significant amount of liquid phase formed during the sintering process of the designed ceramics. Highly open porous(~66-74%) and lightweight(~0.64-0.83 g/cm3) ceramics were produced via starch consolidation technique and low-temperature sintering at atmospheric conditions.

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