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5318712 
Journal Article 
Surface Modification by Stearic Acid on Property of PLZT Piezoelectric Ceramics Prepared via Powder Injection Molding 
Wu Dun; Qin Shuai; Liu Chun-Lin; Fang Bi-Jun; Cao Zheng; Cheng Jun-Feng 
2019 
1 
Wuji Cailiao Xuebao
ISSN: 1000-324X 
34 
5 
535-540 
WOS:000468328900011 
A powder injection molding feedstock of lead zirconate titanate (PLZT) was successfully prepared using stearic acid as powder modifier and polyethylene glycol/polyvinyl butyral/polyoxymethylene (PEG/PVB/POM) as binder system. Then, PLZT piezoelectric ceramics were prepared by degreasing and post-sintering processes. The effects of stearic acid (SA) dosage on powder properties, feedstock viscosity, water degreasing rate and green body strength were studied. The microstructure and electrical properties of the sintered ceramics were compared and analyzed. The results showed that stearic acid was successfully coated onto the PLZT powder by wet modification. The modification of stearic acid broke the agglomeration between the powders, and when the amount of stearic acid was 2wt%, the feedstock had a lower shear viscosity and a higher green body bending strength. However, excessive modification caused the feed viscosity to increase and the bending strength of the green body to decrease. The modified powder was uniformly dispersed in the body, and the sintered ceramic had higher density with well grown grains. As compared to the unmodified sample, the piezoelectric constant d(33) of the PLZT modified with 2wt% SA increased from 638 pC/N to 682 pC/N. 
stearic acid; powder modification; PLZT; injection molding; piezoelectric performance