Ukuqhathanisa inqubo yokubumba ye-silicon carbide ceramic: inqubo ye-sintering kanye nezinzuzo zayo kanye nokubi

I-silicon carbide ceramicUkuqhathanisa inqubo yokubumba: inqubo ye-sintering kanye nezinzuzo zayo kanye nokubi

Ekukhiqizeni i-silicon carbide ceramics, ukwakha kuyisixhumanisi esisodwa kuyo yonke inqubo. I-Sintering iyinqubo eyinhloko ethinta ngokuqondile ukusebenza kokugcina nokusebenza kwezitsha zobumba. Kunezindlela eziningi ezihlukene zokucwilisa i-silicon carbide ceramics, ngayinye inezinzuzo zayo kanye nokubi. Kulokhu okuthunyelwe kwebhulogi, sizohlola inqubo ye-sintering ye-silicon carbide ceramics futhi siqhathanise izindlela ezahlukahlukene.

1. Ukusabela sintering:
I-Reaction sintering iyindlela edumile yokwenza izitsha ze-silicon carbide ceramics. Lena inqubo elula futhi engabizi kakhulu eduze nenethi kuya kusayizi. I-Sintering ifinyelelwa ngokusabela kwe-silicidation ekushiseni okuphansi kwe-1450 ~ 1600 ° C kanye nesikhathi esifushane. Le ndlela ingakhiqiza izingxenye zobukhulu obukhulu kanye nesimo esiyinkimbinkimbi. Nokho, nayo inemibi yayo. Ukusabela kwe-siliconizing nakanjani kuholela ku-8% ~ 12% ye-silicon yamahhala ku-silicon carbide, enciphisa izakhiwo zayo zemishini ezisezingeni eliphezulu, ukumelana nokugqwala, nokumelana ne-oxidation. Futhi izinga lokushisa lokusetshenziswa lilinganiselwe ngaphansi kuka-1350°C.

2. Ukucindezela okushisayo kwe-sintering:
Ukucindezela okushisayo kungenye indlela evamile yokufaka izitsha zobumba ze-silicon carbide. Ngale ndlela, i-silicon carbide powder eyomile igcwaliswa ibe yisikhunta futhi ifudumale ngenkathi ifaka ingcindezi evela ku-uniaxial direction. Lokhu kushisisa kanye nokucindezela kukhuthaza ukusakazeka kwezinhlayiyana, ukugeleza, nokudluliswa kobuningi, okuholela kumaceramics e-silicon carbide anezinhlamvu ezinhle, ukuminyana okuphezulu okuhlobene, kanye nezakhiwo ezinhle kakhulu zemishini. Nokho, i-hot pressing sintering nayo inemibi yayo. Inqubo iyinkimbinkimbi kakhulu futhi idinga izinto zokubumba ezisezingeni eliphezulu kanye nemishini. Ukusebenza kahle kokukhiqiza kuphansi futhi izindleko ziphezulu. Ngaphezu kwalokho, le ndlela ifaneleka kuphela emikhiqizweni enezimo ezilula.

3. Ukucindezela okushisayo kwe-isostatic sintering:
I-Hot isostatic pressing (HIP) sintering iwubuchule obuhlanganisa isenzo esihlanganisiwe sokushisa okuphezulu kanye negesi yokucindezela okuphezulu kwe-isotropically. Isetshenziselwa ukucwilisa kanye nokuqina kwe-silicon carbide ceramic powder, umzimba oluhlaza noma umzimba owenziwe ngaphambili. Nakuba i-HIP sintering ingathuthukisa ukusebenza kwe-silicon carbide ceramics, ayisetshenziswa kabanzi ekukhiqizeni ngobuningi ngenxa yenqubo eyinkimbinkimbi nezindleko eziphezulu.

4. Ukucula ngaphandle kwengcindezi:
I-Pressureless sintering iyindlela esebenza kahle kakhulu ekushiseni okuphezulu, inqubo elula ye-sintering kanye nezindleko eziphansi ze-silicon carbide ceramics. Iphinde ivumele izindlela zokubumba eziningi, iyenze ifanele izimo eziyinkimbinkimbi nezingxenye eziwugqinsi. Le ndlela ifaneleka kakhulu ekukhiqizeni izimboni ezinkulu zama-silicon ceramics.

Kafushane, inqubo ye-sintering iyisinyathelo esibalulekile ekukhiqizeni izitsha zobumba ze-SiC. Ukukhethwa kwendlela ye-sintering kuncike ezintweni ezifana nezakhiwo ezifunwayo ze-ceramic, ubunzima bomumo, izindleko zokukhiqiza nokusebenza kahle. Indlela ngayinye inezinzuzo zayo kanye nokubi, futhi kubalulekile ukucabangela ngokucophelela lezi zici ukuze unqume inqubo ye-sintering efaneleka kakhulu yesicelo esithile.