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METALLIC GLASSES FOR HIGH PERFORMANCE MECHANISM APPLICATIONS ON LONG TERM MISSIONS - EXPRO PLUS

ESA Open Invitation to Tender AO9478
Open Date: 14/08/2018
Closing Date: 25/09/2018 13:00:00

Status: ISSUED
Reference Nr.: 18.133.10
Prog. Ref.: Technology Developme
Budget Ref.: E/0901-01 - Technology Developme
Special Prov.: BE+DK+FR+DE+IT+NL+ES+SE+CH+GB+IE+AT+NO+FI+PT+GR+LU+CZ+RO+PL+EE+HU
Tender Type: C
Price Range: 200-500 KEURO
Products: Satellites & Probes / Materials / Metallic / Launchers / Materials / Metallic
Techology Domains: Materials and Processes / Novel Materials and Materials Technology Includes materials not yet used in space but presenting potential interest. / Material Assessment
Establishment: ESTEC
Directorate: Directorate of Tech, Eng. & Quality
Department: Product Assurance and Safety Department
Division: Materials & Components Technology Divisi
Contract Officer: Pratesi, Giulia
Industrial Policy Measure: C3 - Activities restricted to SMEs & R&D organisations, prefe...
Last Update Date: 14/08/2018
Update Reason: Tender issue

Metallic Glasses (MG) are a class of alloys which retain an amorphous structure in the solid state, when cooled from the liquid state. Formation of a fully amorphous structure for large cross sections (up to > 1 cm) is now possible for several alloying systems referred to as Bulk Metallic Glasses (e.g. Fe-base, Ti-base, Al-base, Mg-base, Ca-base, Zr-base). The lack of longrangeorder and the absence of microstructural features (grain boundaries, phase boundaries, segregation) confer attractive properties to MGs, such as high yield strength (up to several GPa), high specific strength, high hardness, high wear resistance, high resilience (ability to store and return elastic energy) and low mechanical damping (i.e. low energy loss). MGs are alsocharacterised by a high elastic strainlimit, low Young modulus and a very high magnetic permeability.From a processing point of view, the high viscosity of MG alloys inthe supercooled liquid state (i.e. above the glass transition temperature) offers possibilities for thermoplastic forming to complicated shapes, with high dimensional accuracy and very good surface finish. A very good surface finish can also be obtained by mouldingor polishing, due to the lack of grain structure.Metallic glasses can also be deposited as thin films with excellent surface finish. Additive Layer Manufacturing techniques have also recently been demonstrated to successfully produce MG material, which virtuallyremoves limitations in part geometry and part thickness.The combination of properties offered by MGs is highly interesting for mechanism applications where high wear resistance, high hardness, good surface finish (bearings balls and races, gears), as well as high elastic strain and energy restoration ability (springs, membranes) are of importance. Low magnetic signature is also required for mechanism components, which can beoffered by MG materials. Fe-base MGs or other compositions appear promising to replace currently used stainless steels and enhance the performance of mechanism components. Harnessing the properties of MGs could lead to componentswith longerlives, higher resistance to launch loads and reduced dimensions, to support longer and more demanding missions. In thisactivity, alloy compositions and suitable production processes for applications in mechanism parts (gears, bearings balls and races, springs, membranes) will be investigated and down-selected. Samples of metallic glass material will be produced andcharacterised against the requirements for the intended applications.The activity consists of the following tasks:- A review of suitable MG alloy compositions will be performed, to fulfil the requirements associated with mechanism components for space applications (e.g. gears, bearings balls and races, springs, membranes).- Suitable processes for the production of MG mechanism parts will be reviewed and identified. Processes allowing the production of bulk metallic glass parts (e.g. Additive Layer Manufacturing, casting, thermoplastic forming) will be considered.Alternatively, processes allowing the application of MG material coatings on bearings and gears elements to reduce friction and cold welding will also be addressed.- Specimens of the selected alloy compositions will be produced byapplying the selected processes.- The specimen properties will by characterised against the requirements of the intended mechanismapplications: mechanical properties (e.g. HCF, creep, hardness, strength), corrosion, SCC, friction, CTE, coating compatibility, lubricant compatibility, magnetic field emission.Procurement Policy: C(3) = Activity restricted to SMEs RD Entities. For additional information please go to EMITS news "Industrial Policy measures for non-primes, SMEs and RD entities in ESA programmes".

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