1. Hanyar tsarkakewa na albarkatun kasa
Domin WBN, HBN, pyrophyllite, graphite, magnesium, iron da sauran datti sun kasance a cikin foda na CBN;Bugu da ƙari, shi da foda mai ɗaure ya ƙunshi oxygen adsorbed, tururin ruwa, da dai sauransu, wanda ba shi da kyau ga sintering.Sabili da haka, hanyar tsarkakewa na albarkatun ƙasa shine ɗayan mahimman hanyoyin haɗin gwiwa don tabbatar da aikin polycrystals na roba.A yayin ci gaba, mun yi amfani da hanyoyi masu zuwa don tsaftace micropowder na CBN da kayan ɗaure: na farko, yi amfani da foda na alamar CBN tare da NaOH a kimanin 300C don cire pyrophyllite da HBN;Sa'an nan kuma tafasa perchloric acid don cire graphite;A ƙarshe, yi amfani da HCl don tafasa akan farantin dumama wutar lantarki don cire ƙarfe, kuma a wanke shi zuwa tsaka tsaki da ruwa mai narkewa.Co, Ni, Al, da dai sauransu da ake amfani da su don haɗin gwiwa ana bi da su ta hanyar rage hydrogen.Daga nan sai a hada CBN da binder daidai gwargwado daidai gwargwado a zuba a cikin graphite mold, sannan a aika a cikin tanderun da bai wuce 1E2 ba, a yi zafi a 800 ~ 1000 ° C na 1h don cire datti, an haɗa oxygen. da tururin ruwa a samansa, ta yadda fuskar hatsin CBN ta kasance mai tsafta.
Dangane da zaɓi da ƙari na kayan haɗin gwiwa, nau'ikan abubuwan haɗin gwiwa da ake amfani da su a halin yanzu a cikin polycrystals na CBN ana iya taƙaita su zuwa rukuni uku:
(1) Ƙarfe, kamar Ti, Co, Ni.Cu, Cr, W da sauran karafa ko gami, suna da sauƙi don yin laushi a yanayin zafi mai zafi, suna shafar rayuwar kayan aiki;
(2) Ƙwararrun yumbu, irin su Al2O3, yana da tsayayya ga yawan zafin jiki, amma yana da tasiri mara kyau, kuma kayan aiki yana da sauƙin rushewa da lalacewa;
(3) Cermet bond, kamar m bayani kafa ta carbides, nitrides, borides da Co, Ni, da dai sauransu, warware shortcomings na sama biyu iri bond.Jimlar adadin abin ɗaure zai isa amma kada ya wuce kima.Sakamakon gwaji ya nuna cewa juriya da juriya da lankwasawa na polycrystal suna da alaƙa da alaƙa da matsakaiciyar hanya ta kyauta (kauri na haɗin haɗin gwiwa), lokacin da matsakaicin matsakaicin kyauta shine 0.8 ~ 1.2 μ M, ƙimar lalacewa na polycrystalline shine mafi girma, kuma Adadin ɗaure shine 10% ~ 15% (rabo taro).
2. Cubic boron nitride (CBN) kayan aiki amfrayo za a iya raba kashi biyu
Daya shine a sanya cakudar CBN da wakili na bonding da siminti na carbide matrix a cikin ƙoƙon molybdenum wanda gishiri carbon tube garkuwar Layer ya raba.
Ɗayan shine a haɗa jikin mai yankan polycrystalline CBN kai tsaye ba tare da alluran alloy ba: ɗauki babban latsa mai gefe shida, sannan a yi amfani da dumama taro mai dumama gefe.Ki hada CBN micro-powder mai gauraye, ki rike shi na wani lokaci a karkashin wani matsi da kwanciyar hankali, sannan a sauke shi zuwa dakin zafin jiki sannan a sauke shi zuwa matsi na yau da kullun.Anyi polycrystalline CBN amfrayo wuka
3. Geometric sigogi na cubic boron nitride (CBN) kayan aiki
Rayuwar sabis na kayan aikin boron nitride (CBN) yana da alaƙa da alaƙa da sigoginsa na geometric.Madaidaicin gaba da kusurwoyi na baya na iya inganta tasirin tasirin kayan aiki.Ƙarfin cirewar guntu da ƙarfin watsar zafi.Girman kusurwar rake kai tsaye yana rinjayar yanayin damuwa na yanke da kuma yanayin damuwa na ciki na ruwa.Don guje wa damuwa mai yawa da ke haifar da tasirin injin akan tip ɗin kayan aiki, kusurwar gaba mara kyau (- 5 ° ~ - 10 °) gabaɗaya ana karɓa.A lokaci guda, don rage lalacewa na kusurwar baya, manyan kusurwoyi masu mahimmanci da mataimaki sune 6 °, radius na tip kayan aiki shine 0.4 - 1.2 mm, kuma chamfer yana ƙasa da santsi.
4. Binciken kayan aikin cubic boron nitride (CBN).
Baya ga gwada ma'aunin taurin, ƙarfin lanƙwasawa, ƙarfin ɗaurewa da sauran kaddarorin jiki, ya fi zama dole a yi amfani da na'urar microscope mai ƙarfi don bincika daidaiton saman da gefen jiyya na kowane ruwa.Na gaba shine duba girma, daidaiton girman, ƙimar M, juriyar jumhuriya, rashin ƙarfi na kayan aiki, sannan marufi da ajiya.
Lokacin aikawa: Fabrairu-23-2023