M.Sc.

 This work investigates the joining between graphite and stainless steel grade (410), by using active filler metal paste. Brazing technique was chosen because it is efficient, verstile, fast and economical. High purity of metal powder of  silver, copper  and titanium in different concentrations were mixed carefully to prepare a filler paste. Stainless steel and graphite as a cubic shape were prepared to study both wetting and bonding behaviour as a function of essentially of furnace temperature.

 In this study, K 1-x Na x NbO 3 were prepared with different substitutions (x), where x = (0, 0.5 and, 1) by conventional solid state reaction (SSR). The sample with (x=0) was prepared for different value of sintering temperature (900, 950, 1000 and 1050 II  o C). while the samples with (x=0.5 and 1) with sintering temperature (1000 o C). The resulted powders have polycrystalline structure with a starting to produce a single crystal for the sample with (x=0) above sintering temperature (1000 o C). Also this appeared for (x=0.5 and 1).

 In this research study, the photobleaching (photocatalytic degradation) of two dyes namely; Eriochrom Black T (EBT) as anionic dye and Methyl Violet (MV) as cationic dye have been investigated using