Kupisa kwemaitiro
Kuita kwekuita kunotyisasilicon carbide zvedongoMaitiro ekugadzira anosanganisira ceramic compacting, sintering flux infiltration agent compacting, reaction sintering ceramic product preparation, silicon carbide wood ceramic preparation nezvimwe matanho.
Reaction sintering silicon carbide nozzle
Chekutanga, 80-90% yeupfu hweceramic (hwakagadzirwa nehupfu humwe kana huviri hweupfu hwesilicon carbideuye boron carbide powder), 3-15% yecarbon source powder (inoumbwa nekabhoni nhema imwe chete kana mbiri dzekabhoni nhema uye phenolic resin) uye 5-15% ye molding agent (phenolic resin, polyethylene glycol, hydroxymethyl cellulose kana paraffin) zvinosanganiswa zvakaenzana uchishandisa ball mill kuti pave ne mixed powder, iyo inosvutwa ne spray uye granulated, uye yozodzvanywa mu mold kuti pave ne ceramic compact ine maumbirwo akasiyana-siyana.
Chechipiri, 60-80% yeupfu hwesilicon, 3-10% yeupfu hwesilicon carbide uye 37-10% yeboron nitride powder zvinosanganiswa zvakaenzana, zvodzvanywa muforoma kuti zvive compact ye sintering flux infiltration agent.
Chigadziko checeramic nechinhu chinonyungudika chinonyungudika zvinozounganidzwa pamwe chete, uye tembiricha inokwidzwa kusvika pa1450-1750℃ muchoto chevacuum chine vacuum degree yeasingasviki 5×10-1 Pa yekunyungudika nekuchengetedza kupisa kwemaawa 1-3 kuti chigadzirwa checeramic chinonyungudika chivepo. Zvasara zvinonyungudika pamusoro pechinhu chinonyungudika zvinobviswa nekudzvanya kuti pave nepepa receramic rakakora, uye chimiro chepakutanga chechinhu chinonyungudika chinochengetwa.
Pakupedzisira, nzira yekubvisa reaction sintering inotorwa, kureva kuti, liquid silicon kana silicon alloy ine reaction activity pakupisa kwakanyanya inopinda mu porous ceramic blank ine kabhoni pasi pesimba re capillary, uye inopindirana nekabhoni iri mukati kuti igadzire silicon carbide, iyo inozowedzera muhuwandu, uye ma pores asara anozadzwa ne elemental silicon. Porous ceramic blank inogona kuva pure carbon kana silicon carbide/carbon-based composite material. Yekutanga inowanikwa ne catalytically curing and pyrolyzing an organic resin, pore former uye solvent. Yekupedzisira inowanikwa ne pyrolyzing silicon carbide particles/resin-based composite materials kuti iwane silicon carbide/carbon-based composite materials, kana nekushandisa α-SiC uye carbon powder sezvinhu zvekutanga uye kushandisa pressing kana injection molding process kuti iwane composite material.
Kupisa kusina kumanikidzwa
Maitiro ekupisa silicon carbide asingamanikidzwe anogona kukamurwa kuita solid-phase sintering uye liquid-phase sintering. Mumakore achangopfuura, tsvakiridzo pamusoro pezviumbwa zvesimbi zvesilicon carbidekumba nekune dzimwe nyika kwave kunonyanya kutarisa pakugadzira sintering yemvura. Maitiro ekugadzira ceramic ndeaya: kugadzira bhora rakasanganiswa–>kupfapfaidza negranulation–>kudzvanya->kuomesa–>kusimba kwemuviri wegirini–>kusvibisa vacuum.
Zvigadzirwa zvesilicon carbide zvisina kumanikidzwa
Wedzera zvikamu 96-99 zvesilicon carbide ultrafine powder (50-500nm), zvikamu 1-2 zveboron carbide ultrafine powder (50-500nm), zvikamu 0.2-1 zvenano-titanium boride (30-80nm), zvikamu 10-20 zvephenolic resin inonyungudika mumvura, uye zvikamu 0.1-0.5 zve high-efficiency dispersant kuball mill yekugaya nekusanganisa kwemaawa makumi maviri nemana, woisa mixed slurry mu mixing bar yekukurunga kwemaawa maviri kubvisa mabubbles mu slurry.
Musanganiswa uri pamusoro apa unopfapfaidzwa mushongwe yegranulation, uye hupfu hwegranulation hune chimiro chakanaka chezvimedu, kuyerera kwakanaka, huwandu hwakatetepa hwekupararira kwezvimedu uye hunyoro huri pakati nepakati hunowanikwa nekudzora kumanikidzwa kwekupfapfaidza, tembiricha yekupinda mumhepo, tembiricha yekupinda mumhepo uye saizi yezvimedu zvespray sheet. Kuchinja kwe centrifugal frequency i26-32, tembiricha yekupinda mumhepo i250-280℃, tembiricha yekupinda mumhepo i100-120℃, uye kumanikidzwa kwekupinda muslurry i40-60.
Upfu hwegranulation huri pamusoro apa hunoiswa muforoma yecarbide yakagadzirwa nesimende kuti isvinwe kuti ive nechimiro chegirini. Nzira yekudzvanya ndeyekudzvanya kwemativi maviri, uye toni yekudzvanya kwemudziyo wemuchina i150-200 matani.
Muviri wegirini wakadzvanywa unoiswa muovheni yekuomesa kuti uome uye ugare zvakanaka kuti uve nemuviri wegirini wakasimba.
Muviri wegirini wakagadzirwa pamusoro apa unoiswa muchipfuro chegrafitiuye yakarongedzwa zvakanaka uye zvakanaka, uye ipapo girafiti ine muviri wegirini inoiswa muchoto chekupisa kwakanyanya chevacuum kuti ipfurwe. Kupisa kwekupisa i2200-2250℃, uye nguva yekudzivirira kupisa iawa 1-2. Pakupedzisira, simbi dzesilicon carbide dzisina simba repamusoro dzinowanikwa.
Kupisa kwechikamu chakasimba
Maitiro ekupisa silicon carbide asingamanikidzwe anogona kukamurwa kuita solid-phase sintering uye liquid-phase sintering. Kupisa silicon carbide kunoda kuwedzerwa zvimwe zvinowedzerwa, zvakaita seY2O3 binary uye ternary additives, kuti SiC nezvinhu zvayo zvisanganisirwe zvine liquid-phase sintering uye zviwane densification patembiricha yakaderera. Nzira yekugadzirira solid-phase sintered silicon carbide ceramics inosanganisira kusanganisa zvinhu zvisina kugadzirwa, spray granulation, molding, uye vacuum sintering. Maitiro chaiwo ekugadzira ndeaya anotevera:
70-90% ye submicron α silicon carbide (200-500nm), 0.1-5% ye boron carbide, 4-20% ye resin, uye 5-20% ye organic binder zvinoiswa mumuchina wekusanganisa uye zvinowedzerwa nemvura yakachena kuti zvisanganiswe zvakanyorova. Mushure memaawa 6-48, slurry yakasanganiswa inopfuudzwa nemusefa we 60-120 mesh;
Doro rakaseferwa rinoseferwa kuburikidza neshongwe yespray granulation. Tembiricha yekupinda mushongwe yespray granulation i180-260℃, uye tembiricha yekubuda i60-120℃; huwandu hwakawanda hwezvinhu zvakaseferwa i0.85-0.92g/cm3, kuyerera kwemvura i8-11s/30g; zvinhu zvakaseferwa zvinoseferwa kuburikidza neshongwe ye60-120 mesh kuti zvizoshandiswa gare gare;
Sarudza chiumbwa chinoenderana nechimiro chechigadzirwa chaunoda, isa zvinhu zvakachekwa mugomba rechiumbwa, uye gadzira kudzvanya tembiricha yemukamuri padhishi re50-200MPa kuti uwane ganda regirini; kana kuisa ganda regirini mushure mekudzvanya muchigadzirwa chekudzvanya cheisostatic, gadzira kudzvanya kweisostatic padhishi re200-300MPa, uye gadzira ganda regirini mushure mekudzvanya kwechipiri;
Isa muviri wegirini wakagadzirwa mumatanho ari pamusoro apa muchoto chekupisa chevacuum kuti chisvine, uye chakakodzera isimbi yesilicon carbide isina bulletproof ceramic yakapedzwa; mukuita kwekusvina pamusoro apa, tanga wabvisa choto chekupisa, uye kana dhigirii rekupisa rasvika 3-5×10-2 Mushure mePa, gasi risina simba rinopfuudzwa muchoto chekupisa kusvika pakumanikidzwa kwakajairika robva radziiswa. Hukama huripo pakati pekupisa nenguva ndehwekuti: tembiricha yemukamuri kusvika 800℃, maawa 5-8, kuchengetedza kupisa kwe0.5-1 awa, kubva 800℃ kusvika 2000-2300℃, maawa 6-9, kuchengetedza kupisa kweawa 1 kusvika 2, uye wozotonhodzwa nechoto wodonhedzwa kukupisa kwemukamuri.
Muganhu wekabhoni yesilicon carbide yakapiswa nemhepo yakajairika uye muganhu wezviyo
Muchidimbu, zviumbwa zvesimbi zvakagadzirwa nekupisa zvinopisa zvine mashandiro ari nani, asi mutengo wekugadzira wakawedzerawo zvakanyanya; zviumbwa zvesimbi zvakagadzirwa nekupisa zvisina kumanikidzwa zvine zvinodiwa zvakanyanya zvezvinhu zvakabikwa, kupisa kwakanyanya, shanduko huru yehukuru hwechigadzirwa, maitiro akaomarara uye mashandiro mashoma; zvigadzirwa zvesimbi zvakagadzirwa nekuita kwekupisa zvine huwandu hwakawanda, mashandiro akanaka ekurwisa mabharani, uye mutengo wakaderera wekugadzirira. Maitiro akasiyana-siyana ekugadzira zviumbwa zvesimbi zvesilicon carbide ane zvakanakira nezvazvakaipira, uye mamiriro ekushandisa achasiyanawo. Ndiyo mutemo wakanakisa wekusarudza nzira chaiyo yekugadzirira zvichienderana nechigadzirwa uye kuwana chiyero pakati pemutengo wakaderera nekushanda kwepamusoro.
Nguva yekutumira: Gumiguru-29-2024