Yadda Ake Auna Taurin Ma'adinai
Pendahuluan
Taurin ma'adinai muhimmin abu ne na zahiri a fannin ilimin ƙasa da ilmin ma'adinai. Wannan siffa tana da alaƙa da juriyar ma'adinai ga karce ko gogewa. Auna taurin ma'adinai tsari ne da ke buƙatar hanyoyi daban-daban da kayan aiki masu dacewa don samun sakamako masu kyau. Wannan labarin zai tattauna hanyoyi daban-daban na auna taurin ma'adinai, daga hanyoyin yau da kullun kamar sikelin Mohs zuwa fasahohi masu inganci kamar gwajin taurin Vickers.
Sikelin Mohs: Hanyar Asali
Ɗaya daga cikin hanyoyi mafi sauƙi kuma mafi shahara don auna taurin ma'adinai shine sikelin Mohs. Masanin ilmin ma'adinai Friedrich Mohs ya gabatar da shi a shekara ta 1812, ma'aunin Mohs yana kimanta ma'adanai bisa ga ikon su na karce ko kuma a goge su da wasu ma'adanai. Ma'aunin ya ƙunshi ma'adanai 10 da aka ba da lambar tauri daga 1 (ma'adinan mafi laushi, talc) zuwa 10 (ma'adinan mafi ƙarfi, lu'u-lu'u).
Matakai don Amfani da Sikelin Mohs:
1. Shirya Samfurin: Zaɓi ma'adinan da kake son gwadawa kuma ka tabbatar da cewa saman yana da tsabta kuma babu gurɓatawa da ka iya shafar sakamakon.
2. Gano Ma'anar Ma'ana: Shirya saitin ma'adanai daga sikelin Mohs waɗanda suka haɗa da talc (1), gypsum (2), calcite (3), fluorite (4), apatite (5), feldspar (6), quartz (7), topaz (8), corundum (9), da lu'u-lu'u (10).
3. Yi Gwajin Karce: Shafa ma'adinan da aka yi amfani da shi a kan samfurin da ake gwadawa. Idan ma'adinan da aka yi amfani da shi ya karce samfurin, to taurin samfurin ya yi ƙasa da taurin ma'adinan da aka yi amfani da shi. Idan ba haka ba, to taurin samfurin ya fi girma.
4. Rubuta Sakamakon: Ka tantance inda samfurinka ya faɗi akan sikelin Mohs bisa ga sakamakon gwajin karce.
Misalin akwati:
Idan calcite (taushi na 3) ya yi ƙazanta samfurinka, amma fluorite (taushi na 4) ba zai iya ƙazanta samfurinka ba, taushin ma'adinan naka yana tsakanin 3 zuwa 4 akan sikelin Mohs.
Wannan hanyar ta shahara sosai saboda sauƙinta, amma kuma tana da iyakoki musamman dangane da daidaito da daidaito a matsakaicin ƙimar tauri.
Gwajin Taurin Vickers
Hanyar Vickers wata fasaha ce ta zamani da ake amfani da ita don auna taurin ma'adinai tare da ƙarin bayani da daidaito. Wannan hanyar ta ƙunshi matse dala mai lu'u-lu'u a saman ma'adinan da wani ƙarfi na musamman. Sannan ana auna zurfin ko faɗin karce da aka samu don tantance taurin Vickers (HV).
Matakai don Amfani da Hanyar Vickers:
1. Shirya Samfurin: A yanka kuma a goge samfurin ma'adinan har sai saman ya yi santsi sosai.
2. Shirya Kayan Gwaji na Vickers: Wannan kayan aikin yawanci yana ƙunshe da dala mai siffar lu'u-lu'u da na'urar hangen nesa don auna lanƙwasa.
3. Yi Gwajin Matsi: Danna dala ta lu'u-lu'u a kan saman ma'adinan da wani ƙarfi sannan ka riƙe shi na wani lokaci.
4. Auna Layin: Auna diamita na layin da aka samu ta amfani da na'urar hangen nesa da aka haɗa da kayan aikin gwaji.
5. Lissafa Taurin Vickers: Yi amfani da dabarar da hanyar Vickers ta bayar don ƙididdige taurin. Ana iya tsara taurin Vickers a matsayin HV = 1.854 F/D², inda F shine ƙarfin matsi a cikin ƙarfin kilogram (kgf) kuma D shine diamita na ƙwanƙwasa a cikin millimeters.
Gwajin Taurin Brinell
Hanyar Brinell wata dabara ce da ake amfani da ita musamman ga kayan da suka yi laushi ko suka yi rauni. Wannan tsarin yana amfani da ƙwallon ƙarfe ko carbide da aka matse a saman kayan tare da wani ƙarfi na musamman. Ana auna diamita na ƙoƙon da aka samu don tantance ƙimar ƙarfin Brinell (HB).
Matakai don Amfani da Hanyar Brinell:
1. Shirya Samfurin: Dole ne saman ma'adinan ya kasance mai faɗi kuma ba shi da gurɓatawa.
2. Shirya Kayan Gwaji na Brinell: Yawanci yana ƙunshe da ƙwallon ƙarfe da na'urar hangen nesa don auna ƙofofin da ke ciki.
3. Yi Gwajin Matsi: Danna ƙwallon ƙarfe a saman ma'adinan da wani ƙarfi sannan ka riƙe shi na wani lokaci.
4. Auna Layin: A auna diamita na layin daidai ta amfani da na'urar hangen nesa.
5. Lissafa Taurin Brinell: Yi amfani da dabarar HB = 2F / (πD(D – sqrt(D² – d²))), inda F shine ƙarfin matsi a cikin newtons, D shine diamita na ƙwallon gwaji, kuma d shine diamita na ƙwanƙwasa.
Ƙarin Dabaru
Baya ga hanyoyin da aka ambata a baya, akwai wasu dabaru da dama don auna taurin ma'adinai, kamar hanyar Knoop, hanyar Rockwell, da gwajin microhardness ta amfani da nanoindentation. Kowace hanya tana da nata fa'idodi da ƙuntatawa, amma duk suna da nufin samar da bayanai masu inganci da cikakken bayani.
Hanyar Ƙulli
Gwajin taurin Knoop (KHN) wata dabara ce da ta yi kama da hanyar Vickers, amma tana amfani da indent mai siffar triangle pyramidal. Sau da yawa ana amfani da wannan dabarar don gwada kayan da suka yi siriri ko kuma masu rauni.
Hanyar Rockwell
Gwajin taurin Rockwell hanya ce da ke amfani da na'urar shiga mai siffar ƙwallo ko mazugi don auna zurfin shigar da kayan da ke cikin kaya. Ana ƙididdige ƙimar ta hanyar kwatanta zurfin shigar da na'urar shiga kafin da kuma bayan an yi amfani da ƙarfin.
Nanoindentation
Hanya mafi zamani da inganci, wato nanoindentation, ta ƙunshi amfani da ƙaramin indenter don auna halayen injiniya na kayan aiki a sikelin nano. Wannan dabarar tana da matuƙar amfani wajen nazarin halayen ƙananan ma'adanai.
Kammalawa
Auna taurin ma'adinai muhimmin bangare ne na ilimin ƙasa da ilmin ma'adinai. Hanyoyin auna taurin sun kama daga dabaru masu sauƙi kamar sikelin Mohs zuwa fasahohin zamani kamar gwaje-gwajen taurin Vickers, Brinell, da Knoop. Zaɓin hanyar ya dogara ne akan nau'in ma'adinan da ake gwadawa da kuma matakin daidaito da ake so. Ta hanyar ƙwarewa a waɗannan dabarun, masana kimiyya da masu fasaha za su iya fahimta da amfani da halayen ma'adanai na zahiri don aikace-aikace iri-iri, tun daga binciken kimiyya zuwa masana'antu.
