Ultrasonic Atomic Force Microscopy on Spray Dried Ceramic Powder
Spray-dried ceramic powders (e.g., Al2O3) are composed of a plurality of granules, each of which includes ceramic particles and organic binders. It is assumed that the binders become concentrated in the surface layer of the granule in accordance with its type or its volume mixed into a ceramic portion of the granule. However, evidence to prove the assumption was limited because conventional microscopes were not able to clearly visualize the segregation. This paper presents a technique for imaging detailed structure of the spray-dried ceramic powders with the ultrasonic-atomic force microscope (UAFM). The distribution of binder vis-a-vis Al2O3> particles is highly resolved with good contrast. The distribution was confirmed by nano-indentation. Thus, the U-AFM is shown to be a useful diagnostic tool for the development of approaches to spray-dried process evaluation.
KeywordsCeramic Powder Organic Binder Alumina Ceramic Conventional Microscope Toughness Index
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- 4.W. Gao, B. R. Tittmann, and C. Miyasaka, “Contrast Mechanism of Ultrasonic-Atomic Force Microscope”, presented at IEEE 1999 Ultrasonic Symposium (1999)Google Scholar
- 5.L. Jia, M. Mandanas, C. Miyasaka, B. R. Tittmann, and G. L. Messing, “Analysis of Organic Binder Distribution in Spray Dried Granules by Ultrasonic-Atomic Force Microscopy,” Proceedings of SPIE’s International Symposium on Nondestructive Evaluation Techniques for Aging Infrastructure & Manufacturing, 1999, pp. 270–281Google Scholar
- 6.M. C. Bhardwaj, “Nondestructive testing of green ceramics by contact-free ultrasound”, ULTRAN’s sales materials.Google Scholar