Infrared Soldering

The manufacturers stress ease of processing as a particular feature of the material. Recommended melt temperatures are in the range 320-340°C and mould temperatures are 135-165°C. Mould shrinkage of glass-filled grades is usually of the order of 0.2-0.4% in the flow direction and up to twice this value in the transverse direction. The materials are notable for their ability to withstand vapour phase and infrared soldering processes. 

PCT may be used for the production of electronic and automotive components such as circuit board components, connectors, switches and relays, and alternator armatures and pressure sensors. The main application has been in the fabrication of surface-mount connectors that can withstand infrared reflow soldering operations. 

The main use of elemental As is in alloys with Pb and to a lesser extent Cu. Addition of small concentrations of As improves die properties of Pb/Sb for storage batteries (see below ), up to 0.75% improves the hardness and castabilily of type metal, and 0 5-2.0% improves the sphericity of Pb ammunition. Automotive body solder is Pb (92%),, Sb (5 0%), Sn (2.5%) and As (0.5%). Intcrnxitallic compounds with Al, Ga and In give the 111-V semiconductors (p 255) of which GaAs and InAs are of particular value for light-emitting diodes (LEDs), tunnel diodes, infrared emitters, laser windows and Hall-effect devices (p. 258). 

The important uses of lithium fluoride are as flux in glasses, vitreous enamels and glazes in soldering and welding aluminum and its prisms in infrared spectrophotometers. The compound also is used for storing solar energy. 

Use Welding and soldering flux, ceramics, heat-ex-change media, synthetic crystals in infrared and ultraviolet instruments, rocket fuel component, radiation dosimetry. Component of fuel for molten salt reactors, X-ray diffraction. 

Uses Welding and soldering flux ceramics heat-exchange media synthetic crystals in infrared and UV instruments rocket fuel component radiation dosimetry component of fuel for molten salt reactors x-ray diffraction mfg. of vitreous enamels, glazes flux in enamels, glasses... 

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