Narkewa batu karafa

Narkewa na karfe - shi ne mai takamaiman thermodynamic tsari a cikin abin da karfe crystal raga da aka halakar da kuma ya canjãwa daga m lokaci zuwa ruwa.

karfe narkewa zafin jiki - da yawan zafin jiki na tsanani karfe bangaren, wanda yana farawa kan kai cikin lokaci mika mulki (narkewa). A tsari kanta crystallization kuma baya inseparably da alaka da shi. Don narke karfe? shi dole ne a mai tsanani amfani da external zafi Madogararsa da narkewa zafin jiki, sa'an nan ta ci gaba da samar da zafi don shawo kan lokaci mika mulki makamashi. Gaskiyar cewa da karfe narkewa zafin jiki da kanta ya nuna da yawan zafin jiki a da kayan za su kasance a cikin lokaci ma'auni a cikin dubawa tsakanin wani ruwa da kuma wani m. A wannan zafin jiki, da m karfe iya zama lokaci guda biyu a m da kuma a cikin ruwa a jihar. Domin gudanar da narkewa aiwatar da shi wajibi ne don overheat da karfe ne dan kadan fiye da ma'auni da zazzabi don samar da wani m thermodynamic m. Ka ba da wani irin impetus ga tsari.

karfe narkewa zafin jiki ne m kawai ga m abubuwa. A gaban impurities zai matsawa da ma'auni m, a daya shugabanci ko wata. Wannan shi ne saboda da karfe impurities tare da wani daban-daban crystal raga da siffofin, da kuma hulda da karfi kwayoyin halitta a su zai zama daban-daban daga wadanda suke ba a cikin m materialah.V dangane da girma da narkewa zafin jiki fusible karfe ne zuwa kashi (har zuwa 600 ° C, kamar gallium , Mercury), matsakaici meltability (600-1600 ° C, jan, aluminum) da kuma high-da-dab (> 1600 ° C, tungsten, da kuma molybdenum).

A yau duniya na tsarki karafa suna da wuya amfani saboda gaskiyar cewa suna da wata iyaka kewayon jiki Properties. Industry yana da tsawo da kuma tam yana amfani da daban-daban haduwa da karafa - gami, da kuma jinsin halaye ne mafi girma. Narkewa batu karafa na da daban-daban gami za ta bambanta daga narkewa zafin jiki na gami. Daban-daban yawa daga cikin abubuwa sa umurnin narkewa ko crystallization. Duk da haka, akwai da ma'auni yawa a da karafa na ga gami narke ko solidify a lokaci guda, Ina nufin da halayya irin ta kama abu. Irin wannan gami ake kira eutectic.

Sanin da narkewa zafin jiki ne da muhimmanci sosai a lokacin da aiki tare da karfe, wannan darajar ake bukata duka biyu a samar da sigogi ga kirga gami da karfe kayayyakin a lokacin aiki a lokacin da zafin jiki na zamani miƙa mulki na kayan daga abin da samfurin da aka sanya, da kayyade gazawa a da amfani. Domin saukaka, wadannan an tarke su cikin wata guda tebur. Table narkewa karafa - kira sakamakon jiki bincike na halaye na daban-daban karafa. Akwai kuma alluna da kuma irin wannan gami. Da narkewa batu karfe ma ƙwarai dogara a kan matsa lamba, don haka da data alluna dacewa ga wani musamman matsa lamba darajar (yawanci a al'ada yanayin a lokacin da matsa lamba ne 101,325 kPa). A mafi girma da matsa lamba, da hakan narkewa zafin jiki, da kuma mataimakin versa.