I-Silicon Carbide Ceramic

I-silicon carbide iwuhlobo lwe-synthetic carbide ene-SiC molecule. Uma kunikwe amandla, i-silica nekhabhoni kuvame ukwakheka emazingeni okushisa angaphezu kuka-2000°C. I-Silicon carbide inokuminyana kwethiyori engu-3.18g/cm3, ubulukhuni be-Mohs obulandela idayimane, kanye nokuqina okuncane okungu-3300kg/mm3 phakathi kuka-9.2 no-9.8. Ngenxa yokuqina kwayo okuphezulu nokumelana nokugqoka okuphezulu, inezici zokumelana nokushisa okuphezulu futhi isetshenziselwa izinhlobonhlobo zezingxenye zemishini ezingagugi, ezingagqwali futhi ezinokushisa okuphezulu. Iwuhlobo olusha lobuchwepheshe be-ceramic obungagugi.

1, Izakhiwo zamakhemikhali.

(1) Ukumelana ne-oxidation: Lapho impahla ye-silicon carbide ishiselwa ku-1300 ° C emoyeni, ungqimba oluvikelayo lwe-silicon dioxide luqala ukukhiqizwa phezu kwekristalu yayo ye-silicon carbide. Ngokuqiniswa kongqimba oluvikelayo, i-silicon carbide yangaphakathi iyaqhubeka nokwenza i-oxidize, ukuze i-silicon carbide ibe nokuphikiswa okuhle kwe-oxidation. Lapho izinga lokushisa lifinyelela ngaphezu kuka-1900K(1627 ° C), ifilimu yokuvikela ye-silicon dioxide iqala ukonakala, kanye ne-oxidation ye-silicon carbide iyaqina, ngakho-ke i-1900K izinga lokushisa elisebenzayo le-silicon carbide endaweni ene-oxidizing.

(2) Ukumelana ne-Acid ne-alkali: ngenxa yendima yefilimu evikelayo ye-silicon dioxide, i-silicon carbide inezakhiwo endimeni yefilimu evikelayo ye-silicon dioxide.

2, Izakhiwo zomzimba nezemishini.

(1) Ukuminyana: Ukuminyana kwezinhlayiyana zamakristalu e-silicon carbide ahlukahlukene kusondele kakhulu, ngokuvamile kubhekwa njenge-3.20g/mm3, kanti ukuminyana kwemvelo kwama-abrasives e-silicon carbide kuphakathi kuka-1.2-1.6g/mm3, kuye ngosayizi wezinhlayiyana, ukwakheka kosayizi wezinhlayiyana kanye nesimo sosayizi wezinhlayiyana.

(2) Ukuqina: Ubulukhuni be-Mohs be-silicon carbide bungu-9.2, i-micro-density ye-Wessler ingu-3000-3300kg/mm2, ukuqina kwe-Knopp kungu-2670-2815kg/mm, i-abrasive iphakeme kune-corundum, eduze nedayimane, i-cubic i-boron nitride ne-boron carbide.

(3) I-Thermal conductivity: Imikhiqizo ye-silicon carbide ine-conductivity ephezulu ye-thermal, i-coefficient encane yokwandisa ukushisa, ukumelana nokushaqeka okuphezulu kwe-thermal, futhi iyimpahla yekhwalithi ephezulu yokuphikisa.

3. Izakhiwo zikagesi.