REACTION DE ALLIGATO FUSIONAL DE COBALT E CHROMO CON INVESTIMENTO.-Alterationes chimic occurrente intra le investimento ligate a phosphate durante le prisa e le cocer esseva determinate per technicas a diffraction de radios X. Es postulate le occurrentia de certe reactiones durante le processo. Tests del resistentia al compression effectuate a varie temperatures corroborava ille postulates. Ess...

Cobalt-catalyzed hydrolysis of sodium borohydride (NaBH(4)) has attracted great attention since the hydride is believed to be promising hydrogen storage material. Cobalt is an efficient metal catalyst and has already proven to be a potential alternative to noble metals. Nevertheless it is not stable. Indeed it transforms into a Co- and B-based material when on contact with NaBH(4). Through ex s...

Magnetic magnesium alloys can be utilised as a load sensitive material, in which the inverse magnetostrictive effect is used in order to measure the actual loads in structural components manufactured from such lightweight sensor alloys. To achieve a material which exhibits magnetic properties, magnesium is alloyed with ferromagnetic materials like cobalt or samarium-cobalt. In order to improve ...

The heating parts of thermogravimetry curves performed for cast alloys in air at high temperatures were analysed, after correction from the effects of air buoyancy variation, to characterize the transient oxidation before reaching the targeted temperature for the isothermal stage usually applied thereafter. This was done here for three binary M-30Cr alloys, six ternary M-30Cr-0.4 and 0.8%C allo...

The application of cobalt and aluminium powders in unconstrained format, not as metal powder tubular wire nor pre-alloyed powder, is used this work to simplify weld alloying. objective study demonstrate the Submerged Arc Welding SAW alloy control oxygen content. Aluminium potential at pool-slag interface order prevent oxidation cobalt. results presented here show that with addition 70% yield Co...

Metastable monotectic Cu-50 at. % Co alloy produced by arc melting has been processed under micro gravity condition using a drop tube and subjected to differential thermal analysis (DTA). Microstructural evidence from the as solidified sample revealed that rapid cooling of melt process was enough incite liquid phase separation in alloy. In samples, temperature ?-phase (Cu-rich) determined be 12...