Zvigadzirwa zvesimbi zvesilicon carbide zvine simba guru pakupisa, zvinodzivirira kupisa kwakanyanya, zvinodzivirira kupera, zvinodzivirira kupisa kwakanyanya, zvinodzivirira kupisa kwakanyanya, zvinodzivirira kupisa kwakanyanya, zvinodzivirira kupisa kwakanyanya, zvinodzivirira ngura yemakemikari nezvimwe zvinhu zvakanaka. Zvave zvichishandiswa zvakanyanya mumotokari, michina, kuchengetedzwa kwezvakatipoteredza, tekinoroji yemuchadenga, magetsi emagetsi, simba nedzimwe nzvimbo, uye zvave ceramic yekuvaka isingatsiviwi ine mashandiro akanaka muminda yakawanda yemaindasitiri. Regai ndikuratidzei!
Kupisa kusina kumanikidzwa
Kupisa kusina kumanikidzwa kunoonekwa senzira inonyanya kuvimbisa yekupisa kweSiC. Zvichienderana nenzira dzakasiyana dzekupisa, kupisa kusina kumanikidzwa kunogona kukamurwa kuita sintering yechikamu chakasimba uye sintering yechikamu chemvura. Kuburikidza ne ultra-fine β- Huwandu hwakakodzera hweB neC (oxygen content iri pasi pe2%) hwakawedzerwa kuSiC powder panguva imwe chete, uye s. proehazka yakapiswa kuSiC sintered body ine density yakakwira kupfuura 98% pa2020 ℃. A. Mulla et al. Al2O3 naY2O3 vakashandiswa sekuwedzera uye vakapiswa pa1850-1950 ℃ ye0.5 μ m β-SiC (particle surface ine huwandu hushoma hweSiO2). Huwandu hweSiC ceramics yakawanikwa hwakakura kupfuura 95% ye theoretical density, uye saizi yegorosi idiki uye saizi yepakati. I1.5 microns.
Kupisa kwemuchina wekupisa
SiC yakachena inogona kungosimwa yakabatana chete pakupisa kwakanyanya pasina zvimwe zvinowedzerwa pakupisa, saka vanhu vazhinji vanoita maitiro ekupisa pakupisa eSiC. Kwave nemishumo yakawanda pamusoro pekupisa pakupisa kweSiC nekuwedzera zvinhu zvinobatsira pakupisa. Alliegro et al. Vakadzidza mhedzisiro yeboron, aluminium, nickel, iron, chromium nezvimwe zvinowedzera zvesimbi paSiC densification. Mhedzisiro yacho inoratidza kuti aluminium nesimbi ndizvo zvinowedzerwa zvinoshanda zvakanyanya kukurudzira kupisa pakupisa kweSiC. FFlange akadzidza mhedzisiro yekuwedzera huwandu hwakasiyana hweAl2O3 pahunhu hweSiC yakasimwa pakupisa. Zvinofungidzirwa kuti kuwedzera kweSiC yakasimwa pakupisa kwakabatana nemaitiro ekunyungudika nekunaya kwemvura. Zvisinei, maitiro ekupisa pakupisa anogona kungogadzira zvikamu zveSiC zvine chimiro chakareruka. Huwandu hwezvigadzirwa zvinogadzirwa nemaitiro ekupisa pakupisa kamwe chete hudiki kwazvo, izvo zvisingakodzeri kugadzirwa kwemaindasitiri.
Kupisa kwe isostatic kudzvanya sintering
Kuti vakunde zvikanganiso zvemaitiro echinyakare ekugadzira sintering, mhando dzeB neC dzakashandiswa sekuwedzera uye tekinoroji yekupisa isostatic pressing sintering yakagamuchirwa. Pa1900 ° C, ceramics dzakapfava dzecrystalline dzine density inodarika 98 dzakawanikwa, uye simba rekukotama patembiricha yemukamuri raigona kusvika 600 MPa. Kunyangwe kupisa isostatic pressing sintering kuchigona kugadzira zvigadzirwa zve dense phase zvine maumbirwo akaomarara uye hunhu hwakanaka hwemakanika, sintering inofanira kuvharwa, izvo zvakaoma kuita kuti kugadzirwa kwemaindasitiri kuve nyore.
Kupisa kwemaitiro
Reaction sintered silicon carbide, inozivikanwawo seself bonded silicon carbide, inoreva maitiro ayo porous billet inosangana negasi kana liquid phase kuti ivandudze billet quality, kuderedza porosity, uye sinter finished products dzine simba rakati uye dimensional accuracy. Take α- SiC powder ne graphite zvinosanganiswa mu specimen uye zvinopiswa kusvika pa 1650 ℃ kuti zvigadzire square billet. Panguva imwe chete, inopinda kana kupinda mu billet kuburikidza negasi Si uye inosangana ne graphite kuti igadzire β- SiC, pamwe chete ne α- SiC particles dziripo. Kana Si yapinzwa zvizere, reaction sintered body ine complete density uye non shrinkage size inogona kuwanikwa. Zvichienzaniswa nedzimwe sintering process, shanduko yehukuru hwe reaction sintering mu densification process idiki, uye zvigadzirwa zvine saizi chaiyo zvinogona kugadzirwa. Zvisinei, kuvapo kwehuwandu hwakawanda hweSiC mumuviri we sintered kunoita kuti high-tembiricha properties ye reaction sintered SiC ceramics iwedzere kuipa.
Nguva yekutumira: Chikumi-08-2022