Collocated Tunable Wavenumber Sensor/Actuators for Smart Structures
Technical rept. 1-30 Apr 1994
MARTIN MARIETTA LABS BALTIMORE MD
Pagination or Media Count:
The first full-sized note the actuator module referred to last month was only approximately 34 of the desired thickness actuator module has been fabricated. The first actuator was sintered using the sintering profile of the 34-sized actuator module 5 deg Cmin to 900 deg C, 1 hour hold, 1 deg C min to 1200 deg C, 3 hour hold, 1 deg Cmin to 500 deg C to room temperature. This actuator cracked during sintering. The sintering schedule was once again slowed down for the second actuator module 5 deg Cmin to 500 deg C, 2 deg C to 900 deg C, hold 1 hour, 1 deg C to 1200 deg C, hold 3 hours, 1 deg C to room temperature, and as a result, we were able to fabricate our first full-sized actuator module without cracks. One full-sized actuator module is out of burnout and is awaiting sintering. Two 34-sized actuator modules have survived sintering without cracks. We plan to use these to help set-up our polishing and testing procedures for the full-sized actuators.
- Fabrication Metallurgy