Transcript Document

SME Initiative
SME INITIATIVE COURSE
MATERIALS
Materials and Processes Division
Estec
Materials and Processes Division
ESA/ESTEC/TOS-QM
Sheet 1
SME Initiative
THESE HANDOUTS ARE RELEASED FOR GENERAL INSTRUCTION ONLY.
THEY ARE NOT MEANT TO TAKE ANY PRECEDENCE OVER APPLICABLE PROJECT REQUIREMENTS,
DOCUMENTS AND DEFINITIONS.
Materials and Processes Division
ESA/ESTEC/TOS-QM
Sheet 2
SME Initiative
Course Content
1.
The requirements related to materials, mechanical parts and processes (PMP) with
reference to the ESA PSS and ECSS specifications
2.
Documentation requirements
3.
Material properties requirements and associated test methods for non-metallic
materials
4.
Cleanliness and contamination control
5.
Material properties requirements, critical processes and associated test methods
for metallic materials
6.
Flammability and toxicity control
7.
Visit to the laboratories of the Material and Processes Division
Materials and Processes Division
ESA/ESTEC/TOS-QM
Sheet 3
SME Initiative
Course Tutors
Sessions 1,2,5: Ton de Rooij, Head Materials, Mechanics and Processes
Section (Code TOS-QMM)
Tel: (31)71-5653716, fax: (31)71-5654992,
email:[email protected]
Session 3,4:
Jaco Guyt, Materials Physics and Chemistry Section (Code
TOS-QMC)
Tel: (31)71-5653893, fax: (31)71-5654992,
email:[email protected]
Session 6:
John Meehan, MSM-GP
Tel: (31)71-5655178
email:[email protected]
Materials and Processes Division
ESA/ESTEC/TOS-QM
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SME Initiative
Introduction
One question frequently asked is “Why does ESA not have a preferred materials
list whereas such a list does exist for electronic components?”
The reason for this is best summarised by the relationship:
Environment
Material + Process
Application
In other words a material can only be considered together with the associated
process and the final application. To complicate matters further the effects of the
environment (manned or unmanned, LEO or GEO etc.) have to be considered
since these can significantly affect the suitability of the application
Materials and Processes Division
ESA/ESTEC/TOS-QM
Sheet 5
SME Initiative
Example 1
For example:
Solithane 113
(Polyurethane)
+
Process
PCB Conformal Coating
(24 hr 65 °C)
This combination is widely used in spacecraft application.
However for manned space applications this cannot be used since solithane,
in common with most polyurethanes, is flammable
Materials and Processes Division
ESA/ESTEC/TOS-QM
Sheet 6
SME Initiative
Example 2
Sylgard 184
(Silicone)
+
Process
PCB Conformal Coating
(RT cure)
This combination is used for manned space applications.
However for applications exposed to space vacuum this cannot be used since
sylgard does not meet the outgassing requirements.
Materials are therefore approved in conjunction with the associated process, the
application and the associated environment.
In other words, approval is granted per project.
Materials and Processes Division
ESA/ESTEC/TOS-QM
Sheet 7