Special Ceramics inoreva kirasi yekeramics ine yakakosha mechaniki, yemuviri kana makemikari zvimiro, iyo mbishi zvinhu zvinoshandiswa uye inodiwa yekugadzira tekinoroji zvakasiyana zvakanyanya kubva kune akajairwa ceramics uye kusimudzira. Zvinoenderana nehunhu uye mashandisiro, yakakosha ceramics inogona kukamurwa kuita zvikamu zviviri: zvimiro zveceramic uye zvinoshanda zveceramics. Pakati pavo, zviumbwa zvekeramics zvinoreva ceramics inogona kushandiswa seinjiniya zvimiro zvezvinhu, izvo zvinowanzove zvine simba rakawanda, kuomarara kwakanyanya, yakakwirira elastic modulus, yakakwirira tembiricha kuramba, kupfeka kuramba, corrosion kuramba, oxidation kuramba, kupisa kwekushisa kwekudzivirira uye humwe hunhu.
Kune akawanda marudzi emakeramics ezvimiro, zvakanakira uye zvazvakaipira, uye mashandisirwo ezvakanakira nezvaakakanganisa akasiyana, pakati peiyo "silicon nitride ceramics" nekuda kwechiyero chekuita mumativi ese, inozivikanwa seyakanyanya kunaka kuita kwakadzama mumhuri yezvimiro zveceramics, uye ine huwandu hwakanyanya hwekushandisa.
Zvakanakira zvesilicon nitride ceramics
Silicon nitride (Si3N4) inogona kupatsanurwa kuita covalent bond komisheni, ine [SiN4] 4-tetrahedron seyakaumbwa unit. Nzvimbo dzakananga dzenitrogen uye maatomu esilicon zvinogona kuonekwa kubva pamufananidzo uri pazasi, silicon iri pakati petetrahedron, uye nzvimbo dzema vertices mana etetrahedron anogarwa nemaatomu enitrogen, uyezve matatu matatu ega ega anogovera atomu imwe, achigara achitambanuka munzvimbo ine mativi matatu. Pakupedzisira, chimiro chetiweki chinoumbwa. Zvizhinji zvezvinhu zvesilicon nitride zvine hukama neiyi tetrahedral chimiro.
Kune matatu macrystalline maumbirwo esilicon nitride, ayo ari α, β uye γ nhanho, ayo α uye β phases ndiwo anonyanya kufarirwa mafomu esilicon nitride. Nemhaka yokuti maatomu enitrogen akanyatsobatanidzwa, silicon nitride ine simba rakanaka rakakwirira, kuoma kwepamusoro uye kupisa kwekushisa, uye kuoma kunogona kusvika HRA91 ~ 93; Yakanaka yekupisa kusimba, inogona kumira tembiricha yepamusoro ye1300 ~ 1400 ℃; Diki kemikari kuita nekabhoni nesimbi zvinhu zvinotungamira kune yakaderera friction coefficient; Inozvizora uye nekudaro inopesana nekupfeka; Corrosion resistance yakasimba, kuwedzera kune hydrofluoric acid, haina kuita nemamwe inorganic acids, tembiricha yepamusoro inewo oxidation resistance; Iyo zvakare ine yakanaka yekupisa kutyisa kuramba, inopinza kutonhora mumhepo uye ipapo kupisa kwakapinza hakuputsi; Iyo inokambaira yesilicon nitride ceramics inoderera pakupisa kwakanyanya, uye inononoka deformation yepurasitiki idiki pasi pechiito chekushisa kwepamusoro uye mutoro wakamisikidzwa.
Pamusoro pezvo, silicon nitride ceramics inewo simba rakananga, yakakwira chaiyo modhi, yakakwira yekupisa yekupisa, yakanakisa magetsi zvivakwa uye zvimwe zvakanaka, saka ine yakakosha application kukosha munzvimbo yakanyanyisa senge tembiricha yepamusoro, kukurumidza kukurumidza, corrosive media, uye inoonekwa seimwe yeanovimbisa zvimiro zveceramic zvinhu zvekusimudzira nekushandisa, uye kazhinji inova sarudzo yekutanga mumashandisirwo mazhinji anoda kuedzwa.
Nguva yekutumira: Aug-15-2023