Effect of Organic Binder Segregation on Sintered Strength of Dry-Pressed Alumina

• Published in: Journal of the American Ceramic Society Vol. 89; no. 6; pp. 1903 - 1907
• Main Authors: Tanaka, Satoshi, Pin, Chiu Chia, Uematsu, Keizo
• Format: Journal Article
• Language: English
• Published: Malden, USA Blackwell Publishing Inc 01.06.2006; Blackwell; Wiley Subscription Services, Inc
• Subjects: Alumina; Aluminum oxide; Applied sciences; Binders; Building materials. Ceramics. Glasses; Ceramic industries; Ceramics; Chemical industry and chemicals; Density; Exact sciences and technology; Granular materials; Granules; Materials science; Mechanical properties; Microstructure; Miscellaneous; Polyvinyl alcohols; Sintering; Technical ceramics; Segregation; Spray drying; Organic polymers; Experimental study; Binders; Dry pressing; Oxide ceramics; Polyvinylalcohol; Sintering; Acrylic acid polymer; Technical ceramics; Manufacturing; Alumina
• ISSN: 0002-7820; 1551-2916
• DOI: 10.1111/j.1551-2916.2006.01057.x

The influence of binder systems on the structure and properties of alumina ceramics was examined. Two types of binders were used to prepare alumina granules by spray drying: poly‐acrylic acid (PAA) and poly‐vinyl alcohol (PVA). PVA segregated to the surface and subsurface of the granules, whereas PAA was homogeneously distributed. Compaction tests on a single granule showed that the PAA binder provides lower yield stress of granules than PVA. In the die compaction process, the relative density of the compact body started to increase at a lower pressure, and a more homogeneous internal structure was observed in the green compact prepared with the PAA binder than PVA. The homogeneous structure resulted in a sintered body with a strength of 580 vs 485 MPa when PVA was used.