Advanced Metalworking Solutions for
Naval Systems that Go in Harm's Way
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PMN Manufacturing Technology

Objective

Improve the mechanical reliability of high-power density Lead Magnesium Niobate (PMN) ceramics for Navy transducer applications to yield more reliable transducers of a smaller size, lighter weight, and higher output than those containing PZT.

Technical Approach

* Determine the distribution of critical flaws in PMN ceramics by performing mechanical testing and failure analysis * Work with commercial manufacturers to identify sources of flaws and improve manufacturing processes to reduce occurrence and size of flaws * Work with NAVSEA Newport to confirm that improvements in mechanical reliability do not adversely affect electromechanical properties

Benefits

PMN is an enabling technology for sonar systems such as LBVDS. LBVDS will demonstrate smaller transducers, a smaller towbody, reduced ship impact, and less manning to handle while providing higher source levels at a lower drive voltage, enabling better detection at longer range. Compared to existing PZT sonar systems, PMN is projected to give 10 dB higher source level.

Implementation

The National Center for Excellence in Metalworking Technology (NCEMT) will work directly with material suppliers to develop and demonstrate manufacturing process improvements, which will be implemented immediately and directly in the material suppliers’ facilities. PMN will be implemented in the Lightweight Broadband Variable Depth Sonar (LBVDS) system scheduled for sea test October 2001; LBVDS is intended for the IUSW21 for the DD21.

Status

Completed