REG NASA-LLIS-1919-2008 Lessons Learned Solidification Using a Baffle in Sealed Ampoules (SUBSA) Quartz Ampoule Failure.pdf

1、Lessons Learned Entry: 1919Lesson Info:a71 Lesson Number: 1919a71 Lesson Date: 2008-9-19a71 Submitting Organization: MSFCa71 Submitted by: Linda Jetera71 POC Name: Reggie Spiveya71 POC Email: reggie.a.spiveynasa.gova71 POC Phone: 256-544-0321Subject: Solidification Using a Baffle in Sealed Ampoules

2、(SUBSA) Quartz Ampoule Failure Abstract: The use of encapsulant in samples processed in microgravity resulted in non-directional solidification and supercooling of the sample.Description of Driving Event: A SUBSA ampoule contained a lithium chloride/potassium chloride salt encapsulant with an indium

3、 antimonide sample. During a gradient freeze processing run, the encapsulant caused the sample to undercool and undergo non-directional solidification; consequently, breaking the quartz ampoule.Lesson(s) Learned: The use of encapsulant in samples processed in microgravity can result in non-direction

4、al solidification and supercooling of the sample.Recommendation(s): Avoid the use of encapsulants in gradient freeze experiments with indium antimonide.Evidence of Recurrence Control Effectiveness: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-N/AD

5、ocuments Related to Lesson: N/AMission Directorate(s): a71 Space OperationsAdditional Key Phrase(s): a71 Engineering Design (Phase C/D).Additional Info: a71 Project: Solidification Using a Baffle in Sealed Ampoules (SUBSA)Approval Info: a71 Approval Date: 2009-04-20a71 Approval Name: mbella71 Approval Organization: HQProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-