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Laanglade, R. De
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document
Characterisation of Advanced Metal Matrix Composite Materials for Application to High Energy Physics Detectors
Abstract
The Outer Tracker of the Compact Muon Solenoid, one of the large experiments at the CERN Large Hadron Collider, will consist of about 13200 modules, each built up of two silicon sensors. The modules and support structures include thousands of parts that contribute to position and cool the sensors during operation at30°C. These parts must be low mass while featuring high thermal conductivity, stiffness and strength. Their thermal expansion coefficient should match that of silicon to avoid deformations during cooling cycles. Due to their unique thermal and mechanical properties, Aluminium-Carbon Fibre (Al-CF) Metal Matrix Composites are the material of choice to produce such light and stable thermal management components for High Energy Physics detectors. For the CMS Outer Tracker, about 50000 cm3 of Al-CF raw material will be required, to be produced through a reliable process to guarantee consistent properties all along part manufacturing. Two Al-CF production routes are currently considered: liquid casting and a powder metallurgy process based on continuous semi-liquid phase sintering. Dimensional stability of the resulting material is of paramount importance. Irreversible change of shape may be induced by moisture adsorption and onset of galvanic corrosion at the discontinuous interfaces between CF and the Al matrix. This paper presents the results of an extensive investigation through Computed Microtomography, direct microscopical investigations, electrochemical studies of the interface reactivity and metrology measurements, aimed at comparing and interpreting the response to different environments of the respective products. The effect of the application of noble metal coatings is also discussed.