Incazelo evamile ye-Reaction Bonded SiC

Okujwayelekileincazelo yeUkusabelaI-Bonded SiC

I-Reaction Bonded SiC inezinto eziwumshini kanye nokumelana ne-oxidation. Izindleko zayo ziphansi uma kuqhathaniswa. Emphakathini wamanje, sekudonse ukunakwa okwengeziwe ezimbonini ezahlukahlukene.

I-SiC iyisibopho esiqinile se-covalent. Ku-sintering, izinga lokusabalalisa liphansi kakhulu. Ngesikhathi esifanayo, ingaphezulu lezinhlayiya livame ukumboza ungqimba oluncane lwe-oxide oludlala indima yokuvimbela ukusabalalisa. I-Pure SiC ayigxili futhi iminyene ngaphandle kwezithasiselo ze-sintering. Ngisho noma inqubo yokucindezela okushisayo isetshenziswa, kufanele futhi ikhethe izithasiselo ezifanele. Kuphela emazingeni okushisa aphakeme kakhulu, lapho kungatholakala khona izinto ezifanele ukuminyana kobunjiniyela eduze nokuminyana kwethiyori okufanele zibe kububanzi obusuka ku-1950 ℃ ukuya ku-2200 ℃. Ngesikhathi esifanayo, ukwakheka nosayizi wayo kuzonqunyelwa. Yize izinhlanganisela ze-SIC zingatholwa ngokufakwa komhwamuko, kukhawulelwe ekulungiseleleni ukuminyana okuphansi noma izinto zongqimba oluncane. Ngenxa yesikhathi eside sokuthula, izindleko zokukhiqiza zizokhula.

I-Reaction Bonded SiC yasungulwa ngo-1950 nguPopper. Umgomo oyisisekelo uthi:

Ngaphansi kwesenzo se-capillary force, i-silicon ewuketshezi noma i-silicon alloy enomsebenzi osebenzayo ingene kuma-ceramics anezimbotshana eziqukethe ikhabhoni futhi yakhe i-carbon silicon ekuphenduleni. I-silicon carbide esanda kwakhiwa iboshelwe ezinhlayiyeni zokuqala ze-silicon carbide ku-situ, futhi izimbotshana ezisele ku-filler zigcwaliswa nge-ejenti emithiyo ukuze kuqedelwe inqubo yokuqina.

Uma kuqhathaniswa nezinye izinqubo ze-silicon carbide ceramics, inqubo ye-sintering inezici ezilandelayo:

Ukushisa okuphansi kokucubungula, isikhathi esifushane sokucubungula, asikho isidingo semishini ekhethekile noma ebizayo;

Izingxenye ezihlanganisiwe ezisabelayo ezingenakho ukuncipha noma ukushintsha kosayizi;

Izindlela zokubumba ezihlukahlukene (extrusion, umjovo, ukucindezela nokuthela).

Ziningi izindlela zokubumba. Ngesikhathi se-sintering, usayizi omkhulu kanye nemikhiqizo eyinkimbinkimbi ingakhiqizwa ngaphandle kokucindezela. Ubuchwepheshe be-Reaction Bonded be-silicon carbide buye bacwaningwa iminyaka eyikhulu. Lobu buchwepheshe bube ngenye yezinto ezigxilwe kuzo izimboni ezahlukene ngenxa yezinzuzo zabo eziyingqayizivele.