Uthelekiso lwenkqubo yokubumba i-silicon carbide ceramic: inkqubo ye-sintering kunye neenzuzo zayo kunye nokungalunganga

Silicon carbide ceramicinkqubo yokubumba uthelekiso: sintering inkqubo kunye neenzuzo zayo kunye nokungeloncedo

Kwimveliso ye-silicon carbide ceramics, ukwenza ikhonkco enye kuphela kuyo yonke inkqubo. I-Sintering yinkqubo ephambili echaphazela ngokuthe ngqo ukusebenza kokugqibela kunye nokusebenza kweekeramics. Zininzi iindlela ezahlukeneyo zokutshiza i-silicon carbide ceramics, nganye ineengenelo zayo kunye nezinto ezingeloncedo. Kule posi yebhlog, siza kuphonononga inkqubo ye-sintering ye-silicon carbide ceramics kwaye sithelekise iindlela ezahlukeneyo.

1. Ukusabela sintering:
I-reaction sintering bubuchule bokwenza i-silicon carbide ceramics. Le yinkqubo elula kwaye eneendleko eziphantsi kufutshane net-to-size process. I-Sintering iphunyezwa ngokusabela kwe-silicidation kwiqondo lokushisa elisezantsi le-1450 ~ 1600 ° C kunye nexesha elifutshane. Le ndlela inokuvelisa iinxalenye zobukhulu obukhulu kunye nemilo enzima. Noko ke, ikwanazo neentsilelo zayo. Ukusabela kwe-siliconizing ngokuqinisekileyo kukhokelela kwi-8% ~ 12% ye-silicon yasimahla kwi-silicon carbide, enciphisa iipropathi zayo zobushushu obuphezulu, ukuxhathisa ukubola, kunye nokumelana ne-oxidation. Kwaye ubushushu bokusebenzisa bulinganiselwe ngaphantsi kwe-1350 ° C.

2. Ukucofa okutshisayo kwi-sintering:
Ukucofa ngokucofa okushushu yenye indlela eqhelekileyo yokutshiza iiseramikhi zesilicon carbide. Kule ndlela, i-silicon carbide powder eyomileyo izaliswe kwi-mold kwaye ishushu ngelixa ifaka uxinzelelo olusuka kwi-uniaxial direction. Oku kufudumeza kwangaxeshanye kunye noxinzelelo kukhuthaza ukusasazwa kwamasuntswana, ukuhamba, kunye nokuhanjiswa kobuninzi, okukhokelela kwi-silicon carbide ceramics eneenkozo ezintle, ukuxinana okuphezulu, kunye neempawu ezigqwesileyo zomatshini. Nangona kunjalo, i-hot pressing sintering nayo ineziphene zayo. Inkqubo inzima ngakumbi kwaye idinga izinto zokubumba ezikumgangatho ophezulu kunye nezixhobo. Ukusebenza kwemveliso kuphantsi kwaye ixabiso liphezulu. Ukongeza, le ndlela ifanelekile kuphela kwiimveliso ezinemilo elula.

3. I-isostatic eshushu yokucofa sintering:
I-Hot isostatic pressing (HIP) sintering bubuchule obubandakanya isenzo esidibeneyo sobushushu obuphezulu kunye ne-isotropically balanced high-pressure gas. Isetyenziselwa ukucoca kunye nokuxinana kwe-silicon carbide umgubo weceramic, umzimba oluhlaza okanye umzimba owenziwe ngaphambili. Nangona i-HIP sintering inokuphucula ukusebenza kwe-silicon carbide ceramics, ayisetyenziswanga ngokubanzi kwimveliso yobuninzi ngenxa yenkqubo enzima kunye neendleko eziphezulu.

4. Ukuhlamba ngaphandle koxinzelelo:
Uxinzelelo lwe-sintering yindlela esebenza ngokugqwesileyo ubushushu obuphezulu, inkqubo ye-sintering elula kunye nexabiso eliphantsi le-silicon carbide ceramics. Ikwavumela iindlela ezininzi zokubumba, iyenza ilungele iimilo ezintsonkothileyo kunye namalungu ashinyeneyo. Le ndlela ifaneleke kakhulu kwimveliso yemveliso ye-silicon enkulu.

Isishwankathelo, inkqubo ye-sintering linyathelo elibalulekileyo ekuvelisweni kwee-ceramics ze-SiC. Ukukhethwa kwendlela yokutshiza kuxhomekeke kwizinto ezifana neempawu ezifunwayo ze-ceramic, ubunzima bemilo, iindleko zokuvelisa kunye nokusebenza kakuhle. Indlela nganye ineenzuzo zayo kunye nokungona kwayo, kwaye kubalulekile ukuqwalasela ngokucokisekileyo le miba ukumisela inkqubo ye-sintering efanelekileyo kakhulu kwisicelo esithile.