Huremu hwekabhoni hwese hwakapwanyika hwakasiyana, nekabhoni iri muA-2.5 awt.% muchikamu ichi, zvichigadzira chinhu chakasimba chisina maburi, icho chinoumbwa nezvidimbu zvesilicon carbide zvakagoverwa zvakaenzana uye silicon yakasununguka. Nekuwedzera kwekuwedzera kwekabhoni, huwandu hwesilicon carbide inosanganiswa ne reaction-sintered inowedzera zvishoma nezvishoma, saizi yezvikamu zvesilicon carbide inowedzera, uye silicon carbide yakabatana neimwe neimwe muchimiro cheskeleton. Zvisinei, huwandu hwekabhoni yakawandisa hunogona kutungamira nyore nyore kune kabhoni yakasara mumuviri wakapwanyika. Kana kabhoni dema yakawedzerwa kusvika ku3a, kusinta kwemuenzaniso hakukwani, uye "interlayers" nhema dzinoonekwa mukati.
Kana kabhoni ikasanganiswa nesilicon yakanyungudutswa, huwandu hwayo hwekukura hunosvika 234%, izvo zvinoita kuti chimiro chekabhoni chesilicon chakasanganiswa ne reaction-sintered chakabatana zvakanyanya nekabhoni iri mu billet. Kana kabhoni iri mu billet iri diki, kabhoni yesilicon inogadzirwa ne silicon-carbon reaction haikwani kuzadza maburi akatenderedza kabhoni, zvichikonzera huwandu hwakawanda hwekabhoni mu sample. Nekuwedzera kwekabhoni mu billet, kabhoni yesilicon yakasanganiswa ne reaction-sintered inogona kuzadza maburi akatenderedza kabhoni powder uye kubatanidza silicon carbide yekutanga pamwe chete. Panguva ino, huwandu hwekabhoni yakasununguka mu sample hunoderera uye huwandu hwemuviri wakasanganiswa hunowedzera. Zvisinei, kana paine kabhoni yakawanda mu billet, kabhoni yechipiri inogadzirwa ne reaction pakati pekabhoni nesilicon inokurumidza kukomberedza toner, zvichiita kuti zviomere kuti silicon yakanyungudutswa ibate toner, zvichikonzera kabhoni yakasara mumuviri wakasanganiswa ne sintered.
Zvichienderana nemhedzisiro yeXRD, musanganiswa wechikamu che reaction-sintered sic iα-SiC, β-SiC uye free silicon.
Mukuita kwekupisa kwakanyanya, maatomu ekabhoni anotama kuenda kumamiriro ekutanga pamusoro peSiC surface β-SiC kuburikidza nekugadzirwa kwesilicon α-secondary silicon. Sezvo silicon-carbon reaction iri maitiro akajairika exothermic ane kupisa kwakawanda kwereaction, kutonhora nekukurumidza mushure menguva pfupi yekuzviitira tembiricha yakakwira kunowedzera kusanganiswa kwekabhoni yakanyungudutswa mu liquid silicon, zvekuti β-SiC particles inodonha muchimiro chekabhoni, nokudaro ichivandudza hunhu hwemakanika hwechinhu chacho. Naizvozvo, kunatswa kwekabhoni kwechipiri β-SiC kunobatsira mukuvandudza simba rekukotama. MuSi-SiC composite system, huwandu hwesilicon yakasununguka muchinhu chinodzikira nekuwedzera kwehuwandu hwekabhoni muzvinhu zvakabikwa.
Mhedziso:
(1) Kuwanda kwemvura inonyungudika inogadzirwa nechinhu chinonyungudika (reactive sintering slurry) kunowedzera nekuwedzera kwehuwandu hwekabhoni nhema; pH value iri alkaline uye inowedzera zvishoma nezvishoma.
(2) Nekuwedzera kwehuwandu hwekabhoni mumuviri, huwandu hwesimbi dzakagadzirwa nenzira yekudzvanya hwakatanga kuwedzera uye hwakaderera. Kana huwandu hwekabhoni nhema hwava kaviri nehafu pane huwandu hwekutanga, simba rekukotama kwemativi matatu uye huwandu hwakawanda hwegirini billet mushure mekudonha kwesimbi kwakakwira zvikuru, izvo zviri 227.5mpa uye 3.093g/cm3, zvichiteerana.
(3) Kana muviri une kabhoni yakawandisa ukapiswa, maburi uye nzvimbo nhema dze "sandwich" dzinoonekwa mumuviri wemuviri. Chikonzero chekupwanyika kwacho ndechekuti gasi resilicon oxide rinogadzirwa panguva yekupisa kwe reaction harisi nyore kuburitsa, rinoungana zvishoma nezvishoma, kumanikidzwa kunokwira, uye mhedzisiro yaro yekukwira inotungamira kukuputika kwebillet. Munzvimbo nhema ye "sandwich" mukati mekupisa, mune kabhoni yakawanda isingabatanidzwi mukuita kwe reaction.
Nguva yekutumira: Chikunguru-10-2023