Isiphumo Sezinto Eziphakanyisiweyo Zegrafayithi Kwiimeko Zezimali Nezithuthi Zebhonde Ezisintethwayo

Isiphumo Somlinganiso Wegafrayithi KubeBhonde Nenkosi

Inani legrafayithi liphakathi linemiphumela engaphezu kokuba yiniqwa kakhulu okuphathelene nokuba yiniqwa kangakanani umkhiqizo wamandla kulezi zinkunkuma ze-diamond ezigcinwe. Uma izinhlanganiso zinezinkinga ezingu-5 ukuya ku-7 iphesenti ye-grafayithi, ziyakuwa zingaphansi ngu-15 ukuya ku-20 iphesenti kunalokho kungaphakathi kwesilingo. Lokhu kwenza ukuhlukunyezwa kwebomu kube memuva kahle emgodini wezinduku ezifakwe kumongo. Futhi lokhu kuguquka kakhulu kumlando kusho ukuthi inkunkuma ingasebenze kahle kakhulu ngezizathu, ngaphandle kwezinkinga ezingu-30 iphesenti. Lo hlobo lwempilo kubaluleke kakhulu xa kususwa kumzimba omkhulu njengegranite noma ikonkreti ehlotshwe lapho izinto ziyokuwa nzima kakhulu khona. Kodwa uma sifike phambili ngokwengxenye ye-grafayithi ngaphezu kwe-9 iphesenti, into ethile embi iyakwenzeka. Isakhiwo siqala ukuchitha kancane, futhi amandla ekunqama ayenza iphesenti ephindwa-12 ukuya ku-18 ngoba ikhabhoni enzima kakhulu iyashisa iziqhudeni ezibalulekile zombophakathi okuphathelene ne-cobalt noma i-iron aluminide.

Ukuthuthukisa Kwegolide Kwe-Diamonds Kwi-Bonds Zezimali Ngezidingo Zegrafayithi

Xa sikhulisa i-bonds ngegrafayithi, izidimane zingahlala kakhulu ngaphambi kokuvalwa kuzindlela zokudrillwa ngaphandle kwezibhamu. Yini um причина? Igrafayithi inemvelaphi yokuthuthukisa kahle ngaphezu kuka-120 kuya ku-150 W/mK eyakha umthwalo wokuthuthukisa kusuka endaweni izidimane ihlangana nesimo sezimpende. Lokhu kugcina izinto ezinkululekileyo kusuku lomlando okuyi-750 degrees Celsius lapho kungaphatha ukuthi kungaphatha ukuguquka kwegrafayithi. Imiphumela yamandla ibonisa ukuthi lezi zidimane ezikhulisiweyi zilahle kancane kakhulu ngama-22 kuya ku-35 phesenti lapho zitholwa yizindlela zokuthuthukisa phakathi kuka-600 kuya ku-700 degrees. Sizithola ngokujulile ngokusebenzisa izimpende zegranite ngokulandela isimo sika-ISO 22917 sokulinganisa izindimana zokudrillwa, ngakho ke amanani awuhlala kuphela kuthethekile kodwa anesisekelo sendlela yezinhlobo zezokusebenza.

Ukuthintana Kwegrafayithi Kusuka Kwe-Friction, Ukulahleka, Nenkinga Yomkhawulo

Ukunzulu kwegcinezelo kuthinta kakhulu ukusebenza kuka-graphite ematrikesi yamathambo:

Ubunjani baka-Graphite	I-coefficient yekugaya	Ukuphazanyiswa Kokucotha
<50 µm (Mfushane)	0.18–0.22	25–30%
50–100 µm (Ntsonke)	0.25–0.30	12–18%
>100 µm (Mkhulu)	0.33–0.40	<5%

Igcinezelo eziphansi (<50 µm) zidala ifilimu eqhubekayo yokulubeka eyokuphazanya nokucotshwa emathubini asebenzela ku-Fe₃Al, ngelixa i-graphite enkulu iyakha ubude beporosi nokuthutha kwemigqa, okusabalalisa ukudurable kwe-matrix.

Indima ka-Graphite Ekuphazanyiseni Okungcolayo Ngexesha Lokugcina Ngaphandle Kwamanzi

Xa kufaneleke ukudrila ngaphandle kwezinyo, ukufakwa kwegrafayithi kumathuba okuxhoshisa kungase kube yinkimbinkimbi engu-80 noma kungenzeka kube ngu-120 degrees Celsius ikusukela ekuboneni kuphela isimo esisodwa. Undima wale yindlela efana negrafayithi ibalulekile njengemitholampilo ephindwe kabili. Okokuqala, isebenza njengemitholampilo yomthwalo othile okunciphisa umthwalo wokugaya. Ngasinye isikhathi, lihlasela futhi umthwalo kuma diamond cutting edges. Izivikelo ezihlukene zibonisa iziphumo ezilungile kakhulu. Uma abasebenzi basebenzisa amathuba afakiwe ngu-6 kuze kube ngu-8 iphesenti egrafayithi ngemva kwesikhathi eside sokudrila ngaphandle kwezinyo kumahlathi aphucukayo angaphansi kwequartzite, bavamile ukubona izinkinga ezingu-40 ezingaphansi zokudala kwezinkinga zeziziningi eziphazanyayo kuma diamond.

Indima Yegrafayithi Kukuxhoshiswa Kwesimo Nangokuphindeka Kwemitholampilo

Ukuvutha Koxhoshiso Lwesimo Lwama Diamond-Metal Ngokufaka Kwegrafayithi

Ukuthi kukhona ikhrafayithi kusiza ukuthi izindilinga zihlale ngokulungile kuzintsho zomlilo xa kuzenzekala umhlalo kakhulu ngemva yokwakha. Uma izinto zikhishwa futhi ziqinjelwa (okuthiwa ngokuthi sintering), ikhabhoni evela ekhrafayithini iyaphinda ishunqwe embonweni yekobhamthi noma yezililo. Lokhu kwenza amalayidi aphathekayo akhethekile lapho izindilinga zihelela nomlilo, esenza kube yinkomo eyagcine izinye ngokugcwele. Lokhu kwenza ukuthi amapoki amancane phakathi kwezinto asuke ngama-40%. Kungani lokhu kubaluleke? Oku kusho ukuthi amapoki amancane angcono kusho ukuthi umthelelo uyatholakala ngokusheshayo kuzintsho kuze kube yisindilinga. Oku kubalulekile kakhulu ngoba izindilinga kudingeka zilinde umlilo wazo uma zisebenzisa emaphileni apho kuyasebenza umthelelo omboniso ngokuphindaphindi.

Imikhuba Yokunqoba Kuthuthukiswa Ngokusekelwe Ekgrafayithini Kumatrishi Ezigxekayo

Igrafayithi ibaluleka kakhulu ng during sintering ihlukileyo ngoba ngempela iyamela inzuzo yokufakwa kwezinkuni. Uma ubude bufika kusuku kwe-800 kuya kumcobo omkhulu kanti 1000 degrees Celsius, igrafayithi iqala ukuxhumana nezinhlayiya ezithile zomlando njenge-titanium ne-chromium. Lokhu kwenza izimo eziphakade ezi-TiC noma Cr3C2 ezincane kwezibonakude. Okokuthi kubalulekile kanti kuthi le zinto ezincane zibonakala njengemithombo apho imigqa emisha ivakashela. Zikusiza ukuthutha kakhulu ukuthi izinhlelo ziphile kakhulu ngasikhathi sasikhathi sikhathazekile ukuthi izigaba zingakhulu kakhulu. Izivivinyo zibonisa ukuthi izinhlelo ezakhiwe ngendlela yaleyi zinezimakazo eziphazanyayo eziphazanyayo ngama-15 kuya kuma-20 kusuka kwezinhlelo ezingagrafayithi. Sibonile lokhu ngokwenza izivivinyo ezibhekene nezibini, ngakumbi kunezinsika ezithile ezingaphawuli kakhulu ukuthi kungani oku kuthuthukile.

Ukuthuthuka Kwesithunzi Kwi-Fe3Al-Based Noma Zinye Izilwanyana Ezihlelwe Ngaphandle Kwe-Grafayithi

Xa igrafayithi idinyana ngaphezu kuka-6 kukhanda okuphakade kuze kube yizinhlanganiso ezihlobene ne-Fe3Al, kuthinta ubuhlebukhona obususelwe kufeyisi alfa ezingavumelekile kuya kumkhondo othile we-Fe3AlC3. Umongo wokwakhiwa wena unobuthako obuyindiza ngaphezu kuka-1200 HV nakuba uqinisekisa ukuthula okuphathelene nge-8 MPa m^1/2. Izahloli ezisebenzisa izindlela zokubuyisela i-Electron Backscatter zibonisa ukuthi ukudinyana kwegrafayithi kwenza isivumelwano sezigaba sibe njalo futhi, ngokuvamile phakathi kwe-2 kuya ku-5 micrometers. Lokhu kususelwe kuzigaba esifanayo kwenza ukuthi umongo ube nomdla omkhulu kakhulu ekulondololeni ukugcinwa kwezinkwa nempilo, lokhu kubaluleke kakhulu xa kudrilled amabhasi aphaphazekayo ayashisa ngokuphindaphindi.

Ukudala Kombhalo: Ukuqinisekisa Okungcono Phakathi Kwesimo Sokulahleka Nenhliziyo Ngokudala Igrafayithi

Ukuthola inani elilungileyo ye-graphite kulezinto phakathi kwe-3% ne-7% ngokubanzi kusiza ekudaleni izinqamulo zomhlaba eziphila phakathi kokulwa nokukhula xa usebenza negrenayithi nesimente esaqesheliswe. Xa kukhona i-graphite engaphezulu kwalokho, kuphela kwe-8%, umongo uba ongezintandokazi ezimangalisayo, kanti ke amathuluzi aphila kangcono, mhlawumbe ngama-25% angaphandle, ngoba azihlanza ngokusebenza. Ukuthola lokhu kugelepha kakhulu kumagunya amasha abalwa kumachashi angaphansi kwe-2,500 rpm ungabaqhubekile kabonakala. Abalimi abaningi manje baphokuseni ekulungiseni lokhu kungelepha ngoba kubangelwa ngokuphathelene kanjani izinto zabo zizophila emajobeni ethu.

I-Graphite njengendawo yokufaka: Ukulahlekelwa, ukuba khona kwezinkinga, nokulawula ukuzihlanza

I-Graphite njengenkosi yokudala izinkinga ukuze kulawule izinkinga nekholing

Igrafayithi isebenza njengomsebenzi oshiywa xa kusintera, ukuthi uhlwanye emaphazini amancane (15–25 µm) okunika inzuzo yendluli yamafutha ngaphakathi kwesilonda. Lokhu kwenziwa kunciphisa ukukhula kwesibindi ekugcineni ngaphandle kwamafutha, nezinhloso ebona ububi bokusebenza ngaphansi kwe-20% kunazo ezidingekayo.

Ukunciphisa ubuchwepheshe bebandla ukuze kube lula ukulungiswa ngokujwayelekile ngokudopha kwe-grafayithi

Ukufaka i-5–9% ye-grafayithi ngevolumu kwenza imigodolo yokuhlola ephathelene kumthwalo wemetal, ukuvikela ukubonakala kwe-diamond ngokulahlekelwa kwekhanda ngendlela efakiweyo. Izivikelo zibona ububi bokuba buchwebeshwe ngama-12% nge-9% ye-grafayithi, okubangela ukuba kuqinisekiswe ukulungiswa ngokujwayelekile, kuholela ekugcineni kwe-diamond ngama-30% ngaphakade ekugcineni kwe-granite.

Ukuthuthuka nokuthuthuka kwezici eziphucake kakhulu ekugcineni kwezimali eziphumelelayo

Umrhubo wamakhristalu wesigaba segrafayithi waphinda kungcolwa okuqinileyo, ukuthula kakhulu kwakhe ngokuphazanyiswa kwezinkinga phakathi kwegolide nesibhedhi. Lokhu kuthula izindleko zokukhishwa ngama-18% kanti nakunika impumelelo ekususweni kwegumbi, ikhusela kakhulu ekubhaka izindlekile njengoba ukususa kwezigumbi ezingaphansi kuzange kuthuthukise inkabi yediamond.

Ukuthula kwezinkinga zokugaya kwegolide yesidiamond engaphathelene nagrafayithi

Ukucopheleka kwegrafayithi (7–9%) kumkhawulo ophothelelwe Fe uyekhulisa izinkinga zokugaya phakathi kwemikhawulo ngama-0.15–0.2, njengoba kubonisiwe emacebengweni yokuchaza ngokugaya. Oku kunciphisa izinkinga ngama-40% futhi kunciphisa izidingo zotorque kanti namandla esibhedhi ayisephe indlela ekude, ikakhulukazi xa kubhakwa isandstone esivivinyayo.

Ukucopheleka Kwegrafayithi Ukunciphisa Isindleko Yokubhaka Nenhlaziyo

Inhlanziyo Yenkabi Nenhlaziyo Ekugcwabheni Ngamashidi Aphilwayo Ngadimonde Nagegrafayithi

Ukunyuswa kwegrafayithi okugcinelwe (3–5% ngokunzulu) kuthuthukisa ukumelana ngokulahlekwa ngokulungisa ubunzima bomthombo ngaphandle kokulahla ukuxhasana. Izivikeli zokulungiselela zibonisa ukunyuka kwegcwalisa ngama-21% xa kudilwa ikonkreti enobukhuni obungcono, lokhu kusenzelwa yinkulu yokulahlekwa. Lokhu kuthuthukisa kumelana ngaphambilini kwegrafayithi yadiyamonde ngelinye ukuthi kugcine inkathi yokubonakala kwegcwalisa.

Ubude bebusika beDiamonde kanye Nokugcinwa Kulo Kugcwaliso Lokusebenza Kuthuthukiselwe Ngokunyuswa Kwegrafayithi

Umgama othuthukiswe ngografayithi ungakhuthaza ukugcinwa kwe-diamond ngama-18% emathondweni aphakeme. Ngokudala indawo yokuguquka enguqini phakathi kwegcwalisa le-diamond kanye nomthombo wobumba, i-grafayithi isiza ekugcwaliseni inkulu yethirmali futhi ikhulule inkulu yomthombo phakathi kwesikhathi sokulahlekwa.

Isebenzo Lezimali: Ukucopheleka KweDrilling kanye Nokulahlekwa Kwezindlela Zokusebenzisa

Izivikelo zokubhakala kwegranite zibonisa ukuthi izinhlamvu ezinezimboni ezigcwele kakhulu zifinyelela isantya sokubhaka esiphindaphinda ngakwa-27% kunazo ezinhle. Ngokuvumelana, ukugayaya kwesizungu kudala (≈0.15 mm/hr) nokugayaya kwesizungu kudalawa, kuchaza inkinobeko yezimboni ekhombisa ukuthi kunezimboni ezimbili zokuthuthela nokuphila kwezixweba ngaphandle kokusebenza kahle.

Izindlela Ezihlelekileyo Zokwakha Izenzo Eziqinisekileyo Ze-Diamond Core

Ukukhiqiza kwe-spark plasma (SPS) okuhle kakhulu kwe-diamond-graphite composite

Umethode ozizwa ngokuthi ukugcina kwe-spark plasma nokuthi SPS kumandla ukuba kube yinkinga ekhula kakhulu yezinhlelo zediamond metal graphite, zonke izindawo eziphakeme ngaphezulu kwamathuba okuphindaphinda kanye ne-70% ngaphansi kwalokho ekufuneka ngazo izindlela ezisemthethweni. Uma sisebenzisa lezi zikhwelo zezinhloso, sizothola ngaphezu kuka-98.5% yenkqubo ethile yendawo kulabo mabhubhisi e-Feco. Lokhu kusiza ekukhomeni amadimondi ukuthi achaze into eyodwa nge-graphite futhi ibe yinto efanayo kuzo zonke izinhlelo. Ngokwesayensi esisha esaphindelekile ngo-2024, izincwadi zokudonsa ezidalwe ngaleso SPS zingasebenzela ngaphezu kuka-22% kwezimali eziphakeme uma kudonselwa isibhayi sezintaba sokudonsa kunazo ezijwayelekile ezidonselwe ngokushesha. Yini? Ukuxhumana okuhle phakathi kwezinhlelo ezahlukene kuzo zonke izindawo kuyakhiya kakhulu.

Ukujikeleza kwe-cemented carbides enenhlangothi yokudima enegrafithi elingalungile

Izimodi zokugcina ezisha zidala kusukela ku-3 ukuya ku-8 yekheli le-graphite evela ku-WC-Co cemented carbides ngokusebenzisa izindlela zokudala umlando. Lokhu kwenza izinqawu ezincane zokulubeka ngaphakathi kwezinto eziphakeme ezingcono, okwenzela ukuthi kube khona umehluko. Okutholakelela lapha kukuthula kwesayansi esiphazanyayo phakathi kwe-0.15 futhi ku-0.3, kodwa ikakhulu inakekela ngaphezu kuka-85% yokuchaza kwebasa elilifana neyakamuva ngokushesha. Xa i-graphite ilahlekelwa ngduring processing, ihlala ineempawu ezilinganayo kusukela ku-5 ku-12 micrometers. Lezi ziphawu zancane zenzela ukuthi izahlulo zingene kabanzi ngaphakathi komsindo ngenkathi kudlalwa imarble, kuyadala ukuthutha kusukela ku-30%. Isiphumo sakutsho? Izixhobo ze-diamond zilindile ngoba zihlawula intambo kangcono, lokhu kusho ukuthi kunciphe ngaphezu kwezikhathi kufunekayo ukubuyisela futhi kunciphe ngaphezu kwezixhobo ezingafakiwa kumagunya abasebenzisa lezi zimodi.

Imibuzo Evame Ukubuzwa

Ukukhulu kwe-graphite kuthinta kanjani ubunzima bokudansela kwe-sintered bonds? Ukudala kuya kuye 7% ye-graphite kuthuthela ubunjinga nokukhathazeka, kodwa ukuphakama kwe-9% kungahlaphaza iqondo futhi libe lincane kakhulu.

Yini indlela engcono yokuthuthela kwezinkomba eziphezulu kumatrikes wamanzi? Izinkomba eziphezulu zilahlela ukulahlekelwa ngokudala ifilimu esiqhudeni sokulubala, ngelikhalo izinkomba ezikhulu zingakwamukela ukuthutha okuningi futhi ziphumelela emandleni.

Kanjani graphite ikhuthaza ubunzima bokuxhasana ngenkathi isibhedlela? Ukuqina kuka-graphite kuthuthela ukusulela kwesithutha, kuvumela amadodinika ukuba akhuthaze izinkeleni eziningi futhi iphindelelwe yizinsuku zalo.

Kungani kusetshenziswa graphite ekugcineni phakathi kuka-diamond-ne-metal? I-graphite isiza ekudaleni izinhlayiya ze-carbide ngenkathi isintera, ikhuthaza ukugcina chemically futhi ilahlele ukuguquka kwezinkinga ukuze kube nemvelo elihle.