Ukuphonononga iimpawu ze-porous silicon carbide ceramics

Iimpawu ezikhethekileyo ze-porous i-silicon carbide ceramicszibangelwa ubukhulu becala kulwakhiwo olukhethekileyo olunemingxuma, oluqulathe i-porosity, ubungakanani bepore kunye nokusabalalisa, kunye nokumila kwemingxuma. Ngoko ke, kuyimfuneko ukulawula i-porosity yayo, ubungakanani be-pore kunye nokusabalalisa, kunye ne-pore shape ngokusebenzisa indlela yokulungiselela ukufumana isakhiwo esifunwayo. Ngoko ke indlela yayo yokulungiselela iye yaba yingqwalasela yophando.

Iipropati ze-porous SiC ceramics

1.Iimpawu zePore

①I-Porosity

I-Porosity yipesenti yomthamo othathwe ngama-pores kwi-porous material ukuya kwi-total volume ye-pores (kubandakanywa ii-pores ezivulekileyo, i-half-open pores kunye ne-pores evaliweyo yeentlobo ezi-3). Uphando lubonisa ukuba ukusebenza kwezixhobo ze-porous ikakhulu kuxhomekeke kwi-porosity.

② I-Pore morphology

I-Pore morphology ibhekiselele kwi-morphology ye-pores kwi-ceramics enemingxuma. Xa i-pores i-equiaxed pores, ukusebenza ngokubanzi kwezinto eziphathekayo yi-isotropic; kodwa xa iipores zinemigca okanye zithe tyaba, ezifana ngecarbonization yomthi elungiswe yi-silicon reaction sintering porous SiC ceramics, ubume bepore buyindlela ethile.

③Idayamitha yePore kunye nokusabalalisa

I-pore diameter engaphantsi kwe-2nm yezixhobo ezincinci, ubungakanani bepore phakathi kwe-2 ~ 50nm yemathiriyeli ye-mesoporous, ubungakanani obukhulu kune-20nm kwizinto eziphathekayo. Ngobukhulu bepore kunye nokusabalalisa impembelelo enkulu yokusebenza, kubandakanywa ukunyanzeliswa, izinga lokungena kunye nokusebenza kokucoca.

2.Iimpawu zoomatshini

Porous SiC ceramicizinto brittle kwaye iimpawu zabo mechanical zidla ngokubonakala ngokugoba okanye ukucinezela amandla. I-Porosity kunye nendlela yokulungiselela inempembelelo enkulu kwiipropati ze-mechanical of porous SiC ceramics.

3.I-Thermal Conductivity

I-Porosity kunye ne-pore morphology inempembelelo enkulu kwi-thermal conductivity ye-porous ceramics. Kwi-ceramics ene-porous ene-pore distribution, i-conductivity ye-thermal iyancipha ngokuthe ngcembe njengoko izinga le-pore likhula. Nangona kunjalo, ngenxa ye-pore morphology ye-porous ceramic materials elungiselelwe iinkqubo ezahlukeneyo, kukho ukungafani okukhulu, ngoko ke inkqubo yokudlulisa ubushushu iyaguquguquka ngokuhambelanayo kwaye inzima.

Iiseramikhi ze-SiC ezinamabhodlozineempawu ezibalaseleyo zomzimba zeSiC ngokwayo, ezinje ngoxinaniso oluphezulu lwesambuku, indawo ethile ephezulu, ubunzima obuphezulu, ukumelana nomhlwa, ukumelana nobushushu obuphezulu, ubushushu obuphezulu be-thermal, i-coefficient ephantsi yokwandiswa kwe-thermal, kunye nokuchasana nokothuka kwe-thermal, ngaphezulu kwe-thermal. ukwaneliseka kobume beporous of the ceramics.