Thermally Stable Polycrystalline Diamond Bit Cutter

An gabatar da masu yankan bitar lu'u-lu'u masu tsayayyen zafin zafi lokacin da aka gano cewa ana tsinke masu yankan bitar PDC a wasu lokuta yayin hakowa. Wannan gazawar ya faru ne saboda matsalolin cikin gida da aka haifar sakamakon bambancin fadada lu'u-lu'u da kayan ɗaure.

Cobalt shine abin ɗaure da aka fi amfani da shi a cikin samfuran PCD da aka lalata. Wannan abu yana da ma'aunin zafin jiki na haɓakawa na 1.2 x 10 ^-5 deg. C idan aka kwatanta da 2.7 x 10 ^-6 don lu'u-lu'u. Don haka cobalt yana faɗaɗa sauri fiye da lu'u-lu'u. Yayin da yawan zafin jiki na mai yankan ya tashi sama da 730 deg C matsalolin ciki na ciki wanda ya haifar da nau'o'in haɓaka daban-daban yana haifar da mummunar fashewar intergranular, macro chipping, da saurin gazawar mai yankewa.

Wadannan yanayin zafi sun fi yanayin zafi da ake samu a kasan rijiyar burtsatse (yawanci 100 deg C a 8000 ft). Suna tasowa ne daga juzu'in da aka haifar ta hanyar aikin shearing wanda waɗannan sassan suka yanke dutsen.

Wannan shingen zafin jiki na 730 deg C ya gabatar da manyan shingaye don ingantacciyar aikin yankan PCD.

Masu masana'anta sun yi gwaji tare da haɓaka kwanciyar hankali na thermal na masu yankan kuma an ɓullo da ƙwanƙwasa masu tsinken lu'u-lu'u na polycrystalline.

Waɗannan masu yankan ramuka sun fi kwanciyar hankali a yanayin zafi mafi girma saboda an cire maɗaurin cobalt kuma wannan yana kawar da damuwa na ciki wanda ke haifar da haɓakawa daban-daban. Tun da yawancin abin ɗaure yana da haɗin kai, tsawaita jiyya tare da acid zai iya fitar da mafi yawansa. Abubuwan da ke tsakanin ɓangarorin lu'u-lu'u na kusa ba su da tasiri, suna riƙe 50-80% na ƙaƙƙarfan ƙaƙƙarfan. Leached PCD yana da kwanciyar hankali a cikin inert ko rage yanayin zuwa 1200 deg C amma zai ragu a 875 deg C a gaban iskar oxygen.

An tabbatar da cewa idan za a iya cire kayan cobalt daga gibin hatsi, za a inganta kwanciyar hankali na zafi na haƙoran PDC sosai ta yadda bit zai iya yin rawar jiki mafi kyau a cikin nau'i mai wuyar gaske. Wannan fasahar kawar da cobalt tana haɓaka juriyar lalacewa na haƙoran PDC a cikin sifofin dutse masu ƙyalli kuma yana ƙara faɗaɗa kewayon aikace-aikacen rago PDC.

Don ƙarin bayani game da masu yankan PDC, barka da zuwa ziyarci mu a www.zzbetter.com