High performance Si-70Al alloy baseplate are used in millimeter wave bolometric detectors.
By changing the alloy composition of the aluminium-silicon system, the coefficient of thermal expansion of the material can be controllable to a couple of technical relevant materials like steel, glass, titanium or electroless nickel.Commercially available are alloys containing between 20 and 87 wt % silicon. By raising the silicon content, the physical properties density and thermal expansion decrease while the specific stiffness increases. Due to a powder-metallurgical production process like spray deposition or melt spinning, the rapidly solidified aluminium alloy becomes fine grained, homogeneous and isotropic. CNC machining techniques,for example, turning and milling also can be applied.
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