Silicon oxynitride coatings on glass and polyethylene terephthalate (PET) film have been fabricated by thermal annealing of inorganic polymer perhydropolysilazane (PHPS) between 60 °C and 200 °C. The chemical structure, thermal behavior and structural evolution of PHPS were investigated. The coatings obtained on glass possess pencil hardness as high as 9H, high transparency above 90% in the visible wavelength range, good adhesion to the substrate and a hydrophobic property with water contact angle above 98°. The PHPS coated PET film has pencil hardness above 4H, water contact angle 102° and a high scratch resistance property with no obvious scratches after a 50 cycles scratch test under a load of 2 kg. All these data imply the great potential of PHPS as a hard coating for optical devices. © 2015 Society of Chemical Industry

Cracks in welds are commonly viewed as fatal defects , which possibly cause incredible losses in industries. In this paper, a segmentation method is proposed base on double-thresholding and fuzzy sets theory. Results show that it can also be used in detection of other kinds of defects, and has advantages of simplicity and high efficiency, which are important factors considered in real-time inspection systems.

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