Abstract
Two frites with 40 wt.%SiO2-20 wt.%B2O3-17 wt.%Na2O (G1) and 42wt.%SiO2-24wt.%BaO-18 wt.%CoO (G2) compositions were prepared and applied on stainless steel by the slurry method. The samples were heated at 950ºC (G2) and 860ºC (G1). The XRD results revealed the sodium silicate and barium silicate phases as well as almost 770 HV, 543 HV microhardness in G1 and G2 coats respectively. The thermal expansion coefficients were α=10.9×10-6/K(G1) and α=13.31×10-6/K (G2) respectively. According to EDS results the alkaline earth ions (and CoO) migration into the glass- steel interface was occurred in both coats. The dry sliding friction and wear behavior were investigated using a 4mm diameter AISI52100 steel pin on disk geometry under 5,10 and 18 N loads. The average wear rate were w.r: 32 ×10-14(m3/N.m) and w.r:5×10-14(m3/N.m) in G1 and G2 coats. Then two frites were mixed and heat treated at 800ºC with high heating and cooling rate. The resulted composite (G1-G2) shows almost the average wear rate 4×10-14(m3/N.m), while the coefficient friction of G1-G2 composite was not improved significantly.
Highlights
The barium silicate (BS) glass and glass –ceramic materials are well known as a suitable candidate for sealing in planar SOFCs
On the other hand we considered the Co price in glaze recipe could be decreased by Sodium alumina silicate glass-ceramic as filler
It is clear that the G2 glass has the higher thermal stability and refractoriness compared to G1 and has higher melting temperature, which can be led to the rigid structure of this glass [7]
Summary
The barium silicate (BS) glass and glass –ceramic materials are well known as a suitable candidate for sealing in planar SOFCs. The cobalt containing BS glass-ceramic has evaluated as shock resistance material for use in boiler tubes of power plants [3] They performed the thermal shock test at 600 – 900 o C in muffle furnace, and showed that the CoO containing glass – ceramic coating endured more than 50 times of thermal cycling. They displayed that, steel loss reduced to nearly zero. It can be said that sodium silicate formation helps the bonding of studied glass and the steel substrate In this system the peroxidation of steel is required as well
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