Ukuhlola izakhiwo ze-porous silicon carbide ceramics

Izakhiwo ezikhethekile ze-porous i-silicon carbide ceramicsikakhulukazi ngenxa yesakhiwo sayo esikhethekile se-porous, esiqukethe i-porosity, usayizi we-pore nokusabalalisa, kanye nokuma kwezimbobo. Ngakho-ke, kuyadingeka ukulawula i-porosity yayo, usayizi we-pore nokusabalalisa, kanye nokuma kwe-pore ngokusebenzisa indlela yokulungiselela ukuthola isakhiwo esifunwayo se-porous. Ngakho indlela yayo yokulungiselela bekuyiyona nto igxile kakhulu ocwaningweni.

Izakhiwo ze-Porous SiC ceramics

1.Izakhiwo ze-Pore

①I-Porosity

I-Porosity iphesenti levolumu ethathwe ama-pores endaweni enezimbotshana ukuya kumthamo ophelele wezinto ezimbotshana (kuhlanganise nezimbotshana ezivulekile, izimbotshana ezivuleke uhhafu kanye nezimbotshana ezivaliwe zezinhlobo ezi-3). Ucwaningo lubonisa ukuthi ukusebenza kwe-porous materials ikakhulukazi kuncike ekutheni i-porosity.

② I-Pore morphology

I-Pore morphology ibhekisela ku-morphology yama-pores kuma-ceramics anezimbotshana. Lapho ama-pores e-equiaxed pores, ukusebenza okuphelele kwezinto ezibonakalayo kuyi-isotropic; kodwa uma izimbotshana zinemithende noma ziyisicaba, njengokuthatha i-carbonization yokhuni olulungiswe yi-silicon reaction sintering porous SiC ceramics, ukwakheka kwembobo kuyisiqondiso esithile.

③I-pore ububanzi nokusabalalisa

Imbotshana engaphansi kwe-2nm yezinto zokwakha ezincane, usayizi wembotshana ophakathi kuka-2 ~ 50nm wezinto ezisetshenziswayo ze-mesoporous, usayizi omkhulu kuno-20nm wezinto ezibonakalayo ezinkulu. Ngosayizi wembotshana nokusatshalaliswa komthelela omkhulu wokusebenza, okuhlanganisa ukungeneka, izinga lokungena kanye nokusebenza kokuhlunga.

2.Izakhiwo zemishini

I-Porous SiC ceramicizinto ezisetshenziswayo ziyi-brittle futhi izakhiwo zazo zemishini ngokuvamile zibonakala ngokugoba noma amandla okucindezela. I-Porosity kanye nendlela yokulungiselela inomthelela omkhulu kuzakhiwo zemishini ye-porous SiC ceramics.

3.I-Thermal Conductivity

I-Porosity kanye ne-pore morphology inomthelela omkhulu ekuphatheni okushisayo kwe-porous ceramics. Kuma-ceramics anezimbotshana ezinokusabalalisa kwezimbotshana ezifanayo, ukuqhutshwa kwe-thermal kuncipha kancane kancane njengoba izinga lembobo likhula. Kodwa-ke, ngenxa ye-pore morphology yezinto ze-ceramic ezinama-porous ezilungiselelwe izinqubo ezahlukene, kunomehluko omkhulu, ngakho-ke inqubo yokudlulisa ukushisa iyaguquguquka ngokuhambisanayo futhi iyinkimbinkimbi.

I-Porous SiC ceramicsbabe nezakhiwo ezinhle kakhulu ezibonakalayo ze-SiC ngokwayo, njengokuminyana kwenqwaba, indawo ethize ephezulu, ukuqina okuphezulu, ukumelana nokugqwala, ukumelana nokushisa okuphezulu, ukuhanjiswa kwe-thermal ephezulu, i-coefficient ephansi yokwanda okushisayo, nokumelana nokushaqeka okushisayo, ngaphezulu kwe-thermal. ukwaneliseka kwemvelo ye-porous ye-ceramics.