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Showing posts from June, 2014

Legure

Legure ili slitine su krute otopine metala u metalu, bez određenog stehiometrijskog omjera atoma koji čine leguru. Legure točno određenog stehiometrijskog sastava nazivaju se intermetalni spojevi. Miješanjem čiste kovine s nekom drugom kovinom, ili nemetalom (npr. ugljik), dobiva se slitina ili legura boljih svojstava od ishodnog materijala. Legiranje povećava čvrstoću, tvrdoću i otpornost prema koroziji.

Bakar i kositar su svaki za sebe slabi i suviše savitljivi, ali kad se pomiješaju čine čvrstu leguru - broncu. Mjed je tvrda legura bakra i cinka otporna na koroziju, a aluminijske legure su lagane i čvrste i koriste se za gradnju aviona.

Nordijsko zlato je legura koja se rabi za izradu medalja ili kovanica (kovanice EU od 10, 20 i 50 centi načinjene su od nordijskog zlata). Usprkos nazivu, zlato nije sastojak ove legure, nego:
89% bakar
5% aluminij
5% cink
1% kositar

ImeGlavni sastojciSvojstvaUporabaAlnicoaluminij, nikal, kobalt, željezovisoki magnetizamtrajni magnetiAlpakabakar, ci…

The Stone of the Philosophers by Edward Kelly

Though I have already twice suffered chains and imprisonment in Bohemia, an indignity which has been offered to me in no other part of the world, yet my mind, remaining unbound, has all this time exercised itself in the study of that philosophy which is despised only by the wicked and foolish, but is praised and admired by the wise. Nay, the saying that none but fools and lawyers hate and despise Alchemy has passed into a proverb. Furthermore, as during the preceding three years I have used great labour, expense, and care in order to discover for your Majesty that which might afford you much profit and pleasure, so during my imprisonment - a calamity which has befallen me through the action of your Majesty - I am utterly incapable of remaining idle. Hence I have written a treatise, by means of which your imperial mind may be guided into all the truth of the more ancient philosophy, whence, as from a lofty eminence, it may contemplate and distinguish the fertile tracts fr…