izindaba

Idayimane lokwenziwa

Igridi yedayimane ivamise ukusetshenziselwa ukuchaza izinhlamvu ezincane (≈0.00004 in.) zedayimane lokwenziwa elisetshenziswa njengento eluhlaza engukhiye yabasiki be-PDC.Ngokwamakhemikhali nezakhiwo, idayimane elenziwe ngabantu lifana nedayimane lemvelo.Ukwenza igrit yedayimane kuhilela inqubo elula ngamakhemikhali: ikhabhoni evamile ifudunyezwa ngaphansi kwengcindezi ephakeme kakhulu kanye nezinga lokushisa.Nokho, ekusebenzeni, ukwenza idayimane akulula neze.

Amakristalu edayimane angawodwana aqukethwe kugridi yedayimane anomumo ohlukile.Lokhu kwenza impahla iqine, ibukhali, futhi, ngenxa yokuqina kwedayimane eliqukethwe, imelana ngokwedlulele.Eqinisweni, isakhiwo esingahleliwe esitholakala kudayimane lokwenziwa eliboshiwe lisebenza kangcono ekusheleni kunedayimane lemvelo, ngoba amadayimane emvelo angamakristalu ayi-cubic aphuka kalula emingceleni yawo ehlelekile, eyikristalu.

Igridi yedayimane ayizinzile kangako emazingeni okushisa aphezulu kunedayimane lemvelo, nokho.Ngenxa yokuthi i-metallic catalyst evaleleke esakhiweni segrit inenani eliphezulu lokunwetshwa okushisayo kunedayimane, ukunwetshwa okuhlukile kubeka amabhondi edayimane ukuya-kwedayimane ngaphansi kwe-shear futhi, uma imithwalo iphezulu ngokwanele, ibangela ukwehluleka.Uma amabhondi ehluleka, amadayimane alahleka ngokushesha, ngakho-ke i-PDC ilahlekelwa ubulukhuni nobukhali bayo futhi ingasebenzi.Ukuze uvimbele ukwehluleka okunjalo, abasiki be-PDC kufanele zipholiswe ngokwanele ngesikhathi sokumba.

Amatafula edayimane

Ukuze kwenziwe ithebula ledayimane, insalela yedayimane igaxwa nge-tungsten carbide kanye ne-metallic binder ukuze kwakhe ungqimba olunothe ngedayimane.Zinomumo onjenge-wafer, futhi kufanele zenziwe zijiyile ngendlela engenzeka ngayo, ngoba umthamo wedayimane uyandisa impilo yokugqokwa.Amatafula edayimane ekhwalithi ephezulu ≈2 kuya ku-4 mm, futhi ukuthuthuka kobuchwepheshe kuzokhuphula ukujiya kwetafula ledayimane.Ama-substrates e-Tungsten carbide ngokuvamile aphakeme ngo-≈0.5 in. futhi anomumo ofanayo we-cross-sectional kanye nobukhulu njengetafula ledayimane.Izingxenye ezimbili, itafula ledayimane kanye ne-substrate, zakha umsiki (Fig. 4).

Ukwakha i-PDC ibe yizimo eziwusizo zabasiki kuhilela ukubeka igrit yedayimane, kanye ne-substrate yayo, emkhunjini wengcindezi bese ucwilisa ukushisa okuphezulu nokucindezela.

Abasiki be-PDC abanakuvunyelwa ukuba beqe izinga lokushisa elingu-1,382°F [750°C].Ukushisa okudlulele kukhiqiza ukuguga okusheshayo, ngoba ukunwetshwa kokushisa okuhlukile phakathi kwe-binder nedayimane kuvame ukuphula amakristalu egrit yedayimane akhule akhulele kuthebula ledayimane.Amandla ebhondi phakathi kwetafula ledayimane ne-tungsten carbide substrate nawo abekwa engcupheni ukunwetshwa kokushisa okuhlukile.