Mechanical behavior of metaphosphate glasses used as coating on metals in relation to their structure and preparation method
作者： A. Iost , R. Bigot , F. Barbieux , P. Vast
关键词: Residual stress 、 Phosphate glass 、 Microstructure 、 Materials science 、 Fracture toughness 、 Thermal barrier coating 、 Composite material 、 Metaphosphate 、 Aluminized steel 、 Coating
摘要: The purpose of the present work was to investigate mechanical behavior metaphosphate glass coatings Na2O-CaO-P2O5 system on steel substrates. These may be used as thermal barriers or give anti-corrosion protection. Coacervates glasses under consideration were obtained by a coacervation process, from Graham's salt and deposited aluminized substrate. Chemical composition coacervate phases improved choice cations addition filler reduce residual stresses in metal joints due expansion coefficient mismatch. chemical properties both coating interface studied energy dispersive spectrometry (EDS) hardness measurements. It shown that an alumina layer is formed reaction between phosphates compounds during curing. This acts barrier for iron diffusion. fracture toughness investigated Vickers indentations. Inasmuch cracks are Palmqvist form, Evans Charles formula holds calculating KIC. A value near 0.85 MPa m1/2 found all investigated. Residual stress distribution calculated. compression reduced interlayer formation. good adhesion since produced indentation propagated rather than along interface.
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