Ukukhiqiza Okuthuthukile: Ukubunjwa komjovo weCeramic kuyanda

Ukusetshenziswa kobuchwepheshe bokubumba umjovo we-ceramic

Ngokuthuthuka okusheshayo kobuchwepheshe be-CIM, imikhiqizo yokubumba umjovo we-ceramic isetshenziswe kwezinye izici

1. Ingxenye eyodwa kwezintathu yamakesi ewashi aseSwitzerland akhiqizwa kusetshenziswa ubuchwepheshe bokubumba umjovo we-ceramic powder, kanti impahla i-zirconia, i-ceramic material engagqoki.
2. I-Japan inezixhumi ze-zirconia fiber ezithuthukisiwe ezinobubanzi bembobo engaphakathi engu-0.015mm.
3. I-United States ibone ukukhiqizwa kweziqeshana zezinwele ze-zirconia kanye nokusetshenziswa kwezingxenye ze-silicon nitride ezinjinini.
4. Kuthuthukiswe uhlaka lwe-ceramic lwe-precision double helix mixer kanye namanozzles e-ceramic anezintambo ezimbili ku-State Key Laboratory ye-Powder Metallurgy yase-Central South University of Technology yase-China. Inzwa ye-zirconia yathuthukiswa ngempumelelo yiSikole Sesayensi Yezinto Zokusebenza Nobuchwepheshe be-Huazhong University of Science and Technology isebenzisa ubuchwepheshe be-CIM.

Ishadi eliyisisekelo lokugeleza kwenqubo yokubumba komjovo we-ceramic

Impuphu, ibhinda, i-disperant, i-lubricant -- mixing -- degassing granulation -- injection -- degreasing -- sintering -- Ukuhlolwa komkhiqizo

Ubuchwepheshe bokubumba umjovo we-Ceramic wezidingo ze-ceramic powder

1. I-powder kufanele ilungiselelwe ngokukhethekile umkhawulo wokugcwalisa umkhawulo ophezulu kanye nezindleko eziphansi;
2. Impushana ayihlanganisi;
3. Ukuma kwempushana kuyisiyingi ngokuyinhloko;
4. Kukhona ukungqubuzana okwanele phakathi kwempushana ukuze kugwenywe ukuguquguquka noma ukuwa kwe-billet ngemva kokukhishwa kwe-binder. Ezimweni eziningi, i-engeli ye-slope yemvelo kufanele ibe nkulu kuno-55°;
5. Ukuze kube lula ukucwilisa ngokushesha, kufanele kube nosayizi omncane wezinhlayiyana, ngokuvamile ngaphansi kuka-1 μm;
6. Impushana ngokwayo iminyene, ngaphandle kwama-pores angaphakathi;
7. Ingaphezulu lempushana lihlanzekile futhi aliphenduli ngamakhemikhali ne-binder.

Uhlelo lokuhlanganisa umjovo lokubumba

Izibophezelo ekubumbeni umjovo zinemisebenzi emibili eyisisekelo.

Okokuqala, i-powder ingaxutshwa ngokulinganayo esigabeni sokubumba umjovo, futhi i-powder ingaba ne-fluidity enhle ngemva kokushisa;

Okwesibili, i-binder ingakwazi ukugcina isimo somzimba ngemuva kokubunjwa komjovo nangesikhathi sokwehlisa.

Kungashiwo ukuthi i-binder iwumgogodla kanye nokhiye kubuchwepheshe bokubumba umjovo we-powder, futhi ukuthuthukiswa ngakunye nokuphumelela kwenqubo yokubumba umjovo kuhambisana nokuzalwa kwesistimu entsha yokubopha. Ku-CIM, ngenxa yokuthi usayizi wezinhlayiyana ze-powder mncane kunalowo we-metal powder injection molding, i-fluidity ye-powder ngokwayo impofu, futhi igebe phakathi kwe-powder kanye ne-binder ngemva kokuxuba lincane kakhulu, okuholela ekunciphiseni okunzima, okubeka phambili izidingo ezidinga kakhulu ze-binder. Ngakho-ke, njengesibopho sokubumba umjovo we-ceramic, lezi zimo ezilandelayo kufanele zihlangatshezwe:

1. Ukuhamba kahle. I-viscosity yokubunjwa komjovo kufanele ibe ngokulinganisela, i-viscosity iphezulu kakhulu, i-powder ayikwazi ukuhlakazwa ngokuphumelelayo ku-binder, akunzima nje ukuxuba, kodwa futhi kunzima ukuthola i-billet exutshwe ngokufanayo, okulula ukukhiqiza ukukhubazeka kokubumba; I-viscosity ephansi kakhulu izodala ukuchithwa kwe-ceramic powder kanye ne-binder, futhi i-viscosity ayikwazi ukuguquguquka kakhulu ngezinga lokushisa, ngaphandle kwalokho kuzoba namaphutha.

2. I-binder kumele ikwazi ukumanzisa i-powder kahle futhi ibe nomphumela omuhle wokunamathela ku-powder. Ngokuvamile ukuze kuthuthukiswe ukusebenza kokumanzisa kwe-binder, ezinye izinto ezisebenzayo ezingaphezulu kufanele zengezwe ukuze kuncishiswe i-viscosity yengxube futhi kwandiswe ukugcwala kwayo. Ngesikhathi esifanayo, i-binder imanzisa izinhlayiya ukuze zikhiqize amandla e-capillary ukuze adsorb izinhlayiya futhi agcine umzimba ekuguqukeni. Ukuze uqinisekise ukuzinza kwe-billet, i-powder kufanele ibe inert ehlobene ne-binder.

3. Isibopho sakhiwe ngezinto eziphilayo ezinezingxenye eziningi. Kunzima ku-binder eyodwa ye-organic ukuhlangabezana nezidingo ze-fluidity, futhi ngemva kokuba enye yezingxenye ikhishwe, kwakheka i-porosity evulekile, evumela ukukhishwa kwe-binder esele. Ukuzijwayeza kufakazele ukuthi izinga lokuhoxiswa kwe-multi-component binder lishesha kakhulu kunelo lengxenye eyodwa yokuhlanganisa futhi amaphutha mancane kakhulu. Vele, ama-polymers aphilayo anezibophezelo zezingxenye eziningi ayahambisana.

4. I-binder ine-conductivity ephezulu ye-thermal kanye ne-coefficient ephansi yokwandisa ukushisa. Lokhu akugcini nje ukugwema amaphutha abangelwa ukucindezeleka okushisayo, kodwa futhi kunciphisa ukushaqeka okushisayo emzimbeni futhi kunciphisa amaphutha.

5. Ukwengeza, isibophezelo kumele futhi singabi nobuthi, singangcolisi, singaguquguquki, singabi nomswakama, futhi ukusebenza kokushisisa okujikelezayo akushintshi.

Ukuqhathaniswa kwezinzuzo kanye nokubi kwezinhlelo ezihlukahlukene zokuhlanganisa

Izibophezelo ezimbalwa ezijwayelekile ku-CIM zakhiwe

Eminyakeni yamuva, ama-binders ajwayelekile kakhulu avame ukusetshenziswa ekubumbeni okuhlukahlukene komjovo we-ceramic powder emhlabeni. Njengoba kubonakala etafuleni, izibophezelo ezisetshenziswa ku-CIM ikakhulukazi zingezohlelo lwezingxenye eziningi ze-thermoplastic.

Ukulungiswa kwengxube ye-CIM

Ingxube iyingxube yempushana kanye nesibopho. Kuyo yonke inqubo yokubumba umjovo, ukulungiswa kwengxube ye-powder ne-polymer binder kungenye yezinyathelo ezibaluleke kakhulu. Inqubo idinga ukuthi ingxube ibe ne-homogeneity enhle, izakhiwo ezinhle ze-rheological kanye nezici ezinhle zokunciphisa amafutha.

Ngobuchwepheshe obukhethiwe bokuxuba, indima eyinhloko ukufanisa izinga, izinga lokushisa kanye nesikhathi. Kodwa-ke, uma ijubane lokuxuba kanye nezinga lokushisa liphansi kakhulu, kungakhathaliseki ukuthi isikhathi sokuxuba asikwazi ukufana.

Inkinga ye-rheological ye-PIM ngokuyinhloko ukuhlolwa nokuhlukaniswa kwe-viscosity yengxube.

Ukubumba umjovo

Inhloso yokubumba umjovo ukuthola umzimba owenza i-CIM ongenawo amaphutha kanye nokuhlelwa kwezinhlayiyana ezifanayo ngendlela oyifunayo. Ingxube elungisiwe ingajovwa emshinini ojwayelekile wokubumba umjovo wepulasitiki, noma ingajovwa emshinini okhethekile womjovo wempuphu. Imingcele yenqubo yokubumba ngokuvamile ihlanganisa izinga lokushisa lomjovo, ingcindezi yomjovo, isivinini somjovo, ingcindezi yokubamba ingcindezi, ingcindezi yokubamba isikhathi sokupholisa kanye nezinga lokushisa lesikhunta. Uma imingcele yenqubo ingalawulwa kahle, kulula ukukhiqiza amaphutha ahlukahlukene. Ukukhubazeka komjovo akukwazi ukuqedwa ohlelweni olulandelayo, ngakho-ke le nqubo kufanele ilawulwe ngokuqinile, okubalulekile ekuthuthukiseni isivuno somkhiqizo kanye nokusetshenziswa kwezinto ezibonakalayo.

Izingxenye zokubumba umjovo we-Zirconia

Ukulawula amaphutha kunqubo yokubumba umjovo we-ceramic

Ukulawulwa kwamaphutha enqubweni yokubumba umjovo kungacatshangelwa kusuka ezicini ezimbili: ngakolunye uhlangothi, ubudlelwano phakathi kokushisa kokubumba, ingcindezi kanye nesikhathi kusethiwe; Esinye isici ukugeleza kokuphakelayo emgodini wesikhunta lapho ugcwalisa. Ngenxa yokuthi imikhiqizo eminingi ye-CIM iyizingxenye ezincane ezinobunjwa obuyinkimbinkimbi kanye nezidingo zokunemba okuphezulu, ukugeleza kwengxube emgodini wesikhunta kuhilela izindaba zokuklama isikhunta, okuhlanganisa indawo yembobo yokuphakelayo, ubude besiteshi sokugeleza, indawo yembobo yokuphuma, njll.

I-Ceramic sintering

Inqubo ye-sintering iwukulawula ngokuyinhloko ukukhula kosayizi wokusanhlamvu kwezitsha zobumba, ukuthola izinto zesigaba ezidingekayo, nokuqinisekisa ukuminyana okuphezulu kwe-sintering kanye nomzimba ominyene we-ceramic sintered.

Sintering inqubo nemingcele ezimbili ezibalulekile: sintering lokushisa kanye sintering isikhathi

Inqubo entsha yokubumba umjovo we-ceramic

I-Powder co-injection molding (PCM) iyintuthuko entsha yokubumba umjovo we-powder.Le nqubo isebenzisa umshini wokubumba umjovo wemiphongolo emibili ukuze ujove ngokulandelana izingxube ezimbili ezihlukene zempushana/zokuhlanganisa endaweni yokubumba. Le nqubo ivumela ukwelashwa okungaphezulu ukuthi kwenziwe ngesikhathi sokubunjwa komjovo, kunokuba ngemva kokulungiswa komkhiqizo ophelile. Ukulungiswa nokuphathwa kwendawo yomkhiqizo kungaqedwa ngenqubo eyodwa, yona ngokwayo ekhangayo kakhulu ekubukeni kwezobuchwepheshe nezomnotho.

Ubuchwepheshe bokubumba umjovo wengcindezi ephansi, ngokwenqubo yomjovo ngokwawo, inqubo yokujova ingcindezi ephansi ingcono kunomjovo wengcindezi ephezulu.Ukuphakelwa kwe-viscosity evamile phakathi kuka-1.5-4.0Pa.s kungaqedwa ngomoya ocindezelwe ongu-0.8Mpa, ongasusa isistimu ye-hydraulic, i-injection piston kanye nesistimu yezinduku zokuxhuma kumishini yendabuko. Kungabonakala ukuthi izinzuzo zomjovo wengcindezi ephansi ziyi-gradient yokucindezela okuphansi ekuhlaza komjovo, ukugqoka isikhunta esincane, ukuphakelwa kwesikhunta esingenanduku, ukugwema ukungcola okuphakelayo okubangelwa ukuguga kwepiston yomjovo kanye nokungahlukaniswa kwempushana / i-binder. Ngaphezu kwalokho, kukhona ukusetshenziswa kwamandla okuphansi, usayizi wemishini encane, isakhiwo esilula kanye nezindleko eziphansi.