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Article
Publication date: 16 January 2017

Xuan Song, Zeyu Chen, Liwen Lei, Kirk Shung, Qifa Zhou and Yong Chen

Conventional machining methods for fabricating piezoelectric components such as ultrasound transducer arrays are time-consuming and limited to relatively simple geometries. The…

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Abstract

Purpose

Conventional machining methods for fabricating piezoelectric components such as ultrasound transducer arrays are time-consuming and limited to relatively simple geometries. The purpose of this paper is to develop an additive manufacturing process based on the projection-based stereolithography process for the fabrication of functional piezoelectric devices including ultrasound transducers.

Design/methodology/approach

To overcome the challenges in fabricating viscous and low-photosensitive piezocomposite slurry, the authors developed a projection-based stereolithography process by integrating slurry tape-casting and a sliding motion design. Both green-part fabrication and post-processing processes were studied. A prototype system based on the new manufacturing process was developed for the fabrication of green-parts with complex shapes and small features. The challenges in the sintering process to achieve desired functionality were also discussed.

Findings

The presented additive manufacturing process can achieve relatively dense piezoelectric components (approximately 95 per cent). The related property testing results, including X-ray diffraction, scanning electron microscope, dielectric and ferroelectric properties as well as pulse-echo testing, show that the fabricated piezo-components have good potentials to be used in ultrasound transducers and other sensors/actuators.

Originality/value

A novel bottom-up projection system integrated with tape casting is presented to address the challenges in the piezo-composite fabrication, including small curing depth and viscous ceramic slurry recoating. Compared with other additive manufacturing processes, this method can achieve a thin recoating layer (as small as 10 μm) of piezo-composite slurry and can fabricate green parts using slurries with significantly higher solid loadings. After post processing, the fabricated piezoelectric components become dense and functional.

Details

Rapid Prototyping Journal, vol. 23 no. 1
Type: Research Article
ISSN: 1355-2546

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Article
Publication date: 1 July 2004

Fei‐Wen Ho and Kirk Hallahan

This study examines gestures, themes, message copy points and imagery, and strategy motives reflected in corporate advertising appearing in the China Times and United Daily News…

982

Abstract

This study examines gestures, themes, message copy points and imagery, and strategy motives reflected in corporate advertising appearing in the China Times and United Daily News, two leading newspapers, in the month following the devastating Chin‐Chin earthquake in Taiwan in September 1999. The study identified four possible corporate strategy motives in post‐crisis corporate communications: social responsibility, communal relationship building, enlightened self‐interest and impression management. A content analysis of adverts (n=100) suggested communal relationship building drove corporate advertising endeavours. Corporate philanthropy was the most common gesture described in the adverts, and the most frequent themes and message components focused on the restoration of society. No significant differences were found between companies headquartered in Taiwan versus elsewhere, or between companies headquartered in Asia versus the West. Implications for examining crisis communications and underlying motives behind public relations communications are discussed.

Details

Journal of Communication Management, vol. 8 no. 3
Type: Research Article
ISSN: 1363-254X

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