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Infrared transmitting materials are often used by the aerospace industry to make ''windows'' over guidance systems. These materials are typically weak and brittle and during flight, impact with raindrops and sand, or dust particles, may cause serious optical degradation. These problems have been extensively researched individually, but very little work has been carried out into to the combined effects...
Solid particle erosion of infrared transmitting materials is a particular problem to the aerospace industry, where such materials are frequently used as ‘windows’ over guidance systems. They are typically weak and brittle and may suffer severe optical degradation as a result of impacts. Added durability may be provided by the deposition of a coating. An optimum coating thickness has been found, both...
The erosive hazard experienced by diamond during high velocity fight has been investigated. Impact with rain drops is simulated using a high-velocity jet technique (the multiple-impact jet apparatus or MIJA) which allows threshold velocities for damage to be accurately determined. This technique has been used to assess natural and synthetic diamond (both chemical vapour deposited (CVD) and high-temperature,...
A solid particle erosion facility has been used to study the erosion of two groups of materials. The first contains IR-transmitting solids which have potential application as IR @'windows@' and include zinc sulphide, germanium, calcium lanthanum sulphide, diamond (both natural and free-standing chemically vapour deposited (CVD) diamond), and CVD coated substrates. The second contains highly erosion...
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