Ukuguquguquka kweGangenye yama-Plasma ukuthole Ubunzima obungcono bokudansela phakathi kweDiamond–Braze

Ti neCr Plasma Metallization: Ukuvutha Kakhulu Kwesimo Nokudanselana Kwesikhumba

Xa sisebenzisa ukumetallika kweplasma ukuze siyise titanium noma chromium emazulwini we diamond, kwenza le minyaka encane enguqu ngaphansi kwesilinganiso. Okuqondileyo kulandela - le minyaka ihlanganisa izinkabi ezifana no-TiC ne-Cr3C2 okwenzekayo kuhlangana ngokuchemikhali nesakhiwo se-diamond. Lokhu kuhlanganisa kuyakhula inkimbini phakathi kwezinto ngaphezu kwezintambo ezingavuliweyo. Izivivinyo zibonisa njengamashumi amane angaphandle kwebangela lasekugcineni futhi ekugcineni isimo esivamile noma kube khona izigaba eziphakade kungekho 800. Isici esihle kukhona kusindiso seplasma esixhaswa ngezidingo zezingcindezi ezincane. Lezi zingcindezi zizinzima eziphila ngaphandle kwezishiza ezintathu kungakanani 200 MPa. Lokhu kusho ukuthi iziqhamo ezakhiwe ngale ndlela zilala ngaphezu kwalokho, ngaleso sikhathi amakhankatha amaningi ayavuma le ndlela yezenzo eziphathelene nokuhlukunyezwa.

Amakhala kaPlasma ne-Ta Diffusion: Ukulahlela Ukugrathiwe Ukugcina Ubuchwepheshe bakaDiamond

Ukudonswa kwedayimane kwenzeka lapho idayimane lihlangana khona nezinto ezifakwe i-braze, futhi kungesinye sezizathu eziyinhloko ezenza idayimane liwele phansi lapho liqhuba khona imishini eshisayo. Le nqubo inganciphisa ukuthi idayimane lihlala kahle kangakanani ngama-60%. Ukuze balwe nale nkinga, abakhiqizi basebenzisa i-plasma nitriding kanye nezithiyo zokusabalalisa i-tantalum. Lezi zinqubo zenza izindawo ezicebile nge-nitrogen futhi zakha amakhompiyutha asezinzile e-TaC abamba kangcono ngaphansi kokushisa. Izinga lokwanda kwe-TaC (elicishe libe ngu-1.0 x 10^-6 nge-Kelvin) lihambisana kahle nedayimane ngokwalo, ngakho kunokucindezeleka okuncane lapho izinto zifudumala futhi zipholile futhi. Ukuhlolwa kwezwe langempela kuye kwabonisa ukuthi amadayimane angaphezu kuka-95% ahlala ekhona ngemva kokubhola igranite izikhathi ezingu-30 uma kuqhathaniswa nama-65% kuphela asebenzisa izindlela ezindala. Lo mehluko uba obaluleke ngempela lapho amazinga okushisa edlula ama-450 degrees Celsius ngoba amadayimane angenazo lezi zindlela zokuvikela aqala ukuphenduka i-graphite ngokushesha okukhulu kulawo mazinga.

Ukulinganisa Kwezimpondo Zezimali Zokulahlela

Lokhu kuguquka kusebenza kakhulu kusinda izinkuni zediamond, kakhulisa amandla wesayizi ukusuka ku-30 mN/m ku-70 mN/m. Lokhu kuthuthukisa ukungena okuningi kwegciwane lebhasi futhi kunciphisa ukudibana ngokuphawula—okubaluleke kakhulu ekugcineni kwesikhathi eside se-grit.

Amagciwane e-Active Filler Alloys Angenzelwe Ngokushesha Ukugcina kwe-Diamond

Izinhlobo ze-Ag-Cu-Ti ne-Ni-Cr-B-Si: Ukugcoba Kuyintshisekelo, Ukwenza kwe-Carbide, nokulinganisa Kwesithelo

Imitholampilo yokuqhina njenge-Ag-Cu-Ti ne-Ni-Cr-B-Si isebenzisa indlela ebizwa ngokuthi reactive wetting. Kusenza kube khona ukuthi lezi zinto ziphinde ziphinde ziye kwinzu zediamond, emva koko zidale izinkomo eziphakathi kwe-TiC noma i-CrC ngokulinganiselwe kumtholampilo. Okuthola kungaba yizinkinga eziningi kune-250 MPa, okuyinhanced kakhulu kunalokho esithola ngamaphili angaphathelwanga. Kukhona amaziviko athola ukuthuthuka kwesimo sephakeme okuphindwe kabili. Kwiqembu elithile le-Ni-Cr-B-Si, u-chromium unemisebenzi ethembekile ekwenzeni izixhobo ze-CrC. Ngakolunye uhlangothi, ukufakwa kwe-boron no-silicon kusebenza ngendlela eyimbili: kusula uphazimulo lwempilo futhi kujulile umfanekiso wosayensi. Lokhu kumele kunciphiseke kakhulu ukudluliswa kwesithuthi ngaphezulu kwezinyathelo, okusiza ekukhulenjiseni izidingo zomkhuhlane ozungezile. Uma sibuka iphrothikhi eqedile, le mitholampilo ehambisanayo ye-CTE iyancipha impilo yesithuthi ngaproximately 40%. Futhi, into yokuba ibonakele i-boron ibonakala ihlanganisa izoxide ezilondoloza eziphathekile ekuvikelweni kwezoxido xa kuthathwa inzuzo enkulu yesithuthi.

Ukufakwa Kwamathambole (isb., Sm) Kuma-Ni–Cr Braze Alloys: Ukwakha Okusasazekayo Kwezimali

Xa isamarli emenyene kusabalalisi, kusebenzisa imisebenzi yokuhlukaniswa kwesilimi. Emakhelwini phansi kwe-800 degrees Celsius, izinto ezinesimilo zasamarli ziyobhukuda esikoleni se-diamond-braze. Lapho, zibambelela kakhulu okuqhubeka kwesilika kuwo ngaphezu kwe-60%, njengoba zibambelela ukuchaza kwesandla kwe-alloy etholakala kulomkhawulo othile ukuze kube yizikhathi eziyishumi nanesithupha ngasemini uzobe yizikhathi ezinephutheni kanye nobude obusheshayo. Isigaba esisodwa ngaso samarium sivimela i-graphite ukulungiswa, sisondeza ukuxhumana kwe-electrons kwi-carbide interfaces okwenza iziqondiso zibe nzima, kanti futhi kwenza umkhiqizo ukuthwalelwa kakhulu ngokushesha ngemisebenzi yokufaka. Izikhathi zokudwelisa manje zihlala ngesikhathi singaphansi kwezifoko ezingi-5 endange libhekisele kakhulu. Izivikelo zangempela zibonisa le alloys eziyiswe zenziwe nge-nickel-chromium zilinda izidili ngosakhono oluyisidingo we-92% emva kokugcwalisa amacala angu-50. Lokhu kuyinto engcono yizinye izigaba ezingu-34 kunazo ezenziwa ngokuvamile ne-nickel-chromium kumehluko efanayo.

Izikhubalo ze-CVD nezikhubalo ze-Hybrid Composite ukuze kugcinwe ngokudala i-Diamond ngaphansi komthelelo

Izikhubalo ze-CVD ze-SiC nezikhubalo ze-WC/C Nanolayer: Ukuqinisekisa ukulahlekelwa, ukuthuthukisa kwezinkwa, nokuthintana kwezihlangothi

Umsebenzi we-Chemical Vapor Deposition wadala amakhulu amaningi anamandla kakhulu, ikhusela izinkulungwane ze-diamond uma zihlengahlengiswa ngemisebenzi engcono. I-silicon carbide inamandla okukhathalela umthubi owefika phezulu kuka-1200 degrees Celsius, ngakho akuyi kuguquka ku-graphite ngenkathi yisahluko se-annealing. Kunye, amandla awo aphindaphindwa phakathi kwe-28 kuya kuma-32 gigapascals, okwenzela ukuthi athobele kakhulu ekuphileni kwesifo. Lapho kufakiwe i-WC/C coatings, zaholela ekugcineni kwezinye izinto ngokudibanisa ngendlela ethile kanye nezixhumaniso ze-chemical nge-diamond. Izivikelo zibonisa ukuthi ukudibana kakhulu kwe-grits kakhulu ngama-18 kuya kuma-23 iphasenti ngenkathi kusebenzisa izinhlelo zokucubatha. Inqanawa ye-carbon yenzo yokucoshisa yayisiphazamiso, okususa ukucindezelwa kwegazi. Konke lokhu kumele izindlela zithathe kakhulu emehlweni njenge-concrete ephunywayo kanye ne-granite kunazo ezinye izindlela ezingafakwanga. Zisebenza kahle kakhulu ngaphandle kokuba zinzwakala noma zilungise indlela yoku-braze.

Ukulinganisa Ukusebenza nokukhetha Kriteria Eziphatha Ngcono kakhulu ku-Diamond Retention

Xa ukhetha izinkolo zokugcina amadimendi kumagqabi atholakala ngokubanjwa, qaphela izinkinga zokusebenza ezivikelayo ezingcwele kuzindlela okuthatheke khona:

• Ubuchwepheshe bokudluliswa : Umdlalo we-Ti/Cr plasma uphumelela ekunzuleni okuphakeme kangaka kakhulu (kude kangaka 40%) kunzulwana lwasekuhlaleni; i-alloys yomdlalo Ag-Cu-Ti zayigcina lokhu ngamathuba aqhubekayo ase-TiC aphawulekile ngokuthi ayaxhase umthwalo wokushisa owenziwe 800°C.
• Ukholwa kweshisa : Amaphakethe ase-CVD SiC agcina ubungako bezigqabi emva kwe-1,200°C, ngelixa i-plasma nitriding inika ukulima kwegrafu ikhulula ishisa eliphelele 700°C—yisiko esifanelekileyo kumsebenzi obukhokho obuphakeme obudlule.
• Ukusebenza Kwezindleko : I-alloys ye-Ni-Cr-B-Si zinikeza isebenza esihle emaphandleni ephelele kanye (700–900°C) ngenani elincane elingaba ngu-30% kunamaphakethe ancamanje angaphakathi.
• Ubude bebusuku bekuhlelwa : Amalayini akancane ase-WC/C aphinde iphiwe kabusha ngemizuzu engama-2.5—akha isebenza esihle kakhulu ekugcinweni kwesigqabi xa kuthathwa imiyalelo nekuxhashana.

Kukhona ukuthi uhlanganise teknoloji engcwele nokulinganiso kanye nokufakwa kwalo kubalini. Amatrikesi ezigaba se-tungsten carbide azifuna kangcono izilinganiso ze-chromium esuka ezintshisweni ze-plasma, ngelapho izixwayelo zezinto zilandela kangcono nezilonda eziqinile ne-nickel chromium braze alloys eziyiswe ngokunambahlo. Ungazange uhlupheke futhi ukuthi kulingana kanjani ngezinkinga zokuguquka kakhulu. Uma kukhona isilinganiso esikhulu kakhulu sezinkinga zokuguquka kakhulu, kepha ngaphezulu kwe-2.5 times 10 to the minus sixth per Kelvin uma kuqhubeka ukulayisha, amabhulukwe epansi avuleka khona ngokushesha kakhulu. Ezinye izimo lapho ubunjingaqondile bakhona okubalulekile, bheka izinhlelo ezenza i-carbide njenge titanium plasma coatings noma izibhamu ezinezintlangu. Kufanele lezi zihlale kizindima ezininje zokugcinwa okungenani 180 mega pascals noma phezulu ngokwizikhashi zokuhlola.

Imibuzo Evame Ukubuzwa

Iziphi izilinganiso zeplasma?

Ukumodifyiswa kwezintla kwenziwa ngokufaka amathuba amanentshonalayo njengo titanium noma chromium kumzila, njengengamasiko, ukuze kuthuthukise ukudolobheni kanye nokukhombisa kwezintla.

Kungani ukugrathiwe kuthinta kwezibhamu kwezimasiko?

Ukugrathiwe kungathinta ukudolobheni phakathi kwezimasiko kanye nesicelo sangaphakathi, kuthi kwezimasiko kungahamba ngaphandle kwemisebenzi emakhala, ngakho kuthinta kubo nguye 60%.

Kungani i-CVD amakhefana kusiza izixhobo zezimasiko?

I-CVD amakhefana, njengamakhulu aSiC ne-WC/C nanolayers, akhuthaza ukulahlekelwa kanye nokukhombisa kwebomu, ukusiza izimasiko ukuthuthukise imizamo eziphakade kanye nokuthuthukise ubude bakho.

Umdlalo wakhe ngani amanye amakhemikhali akhona ngaphakathi kwezibhamu?

Amakhemikhali akhona ngaphakathi kwezibhamu njengengasamarium akhuthaza ukudolobheni ngokuthula oksijini kumzila wokudolobheni kanye nokuthula kwebomu, ukuthi kudolobheni kakhulu kanye nokusebenzisa ngokushesha.