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 marudzi akawanda ezvigadzirwa zvemakeramics, zvakanakira nekuipira, uye mashandisirwo ezvakanakira nezvakashata zvakasiyana, pakati peiyo "silicon nitride ceramics" nekuda kwechiyero chekuita mumativi ese, inozivikanwa seyakanyanya kunaka dhizaini. iyo yakarongeka ceramics mhuri, uye ine yakanyanyisa kuwanda kwekushandisa.
Zvakanakira zvesilicon nitride ceramics
Silicon nitride (Si3N4) inogona kupatsanurwa kuita covalent bond komisheni, ine [SiN4] 4-tetrahedron seyakaumbwa unit. Iwo chaiwo nzvimbo dzenitrogen nesilicon maatomu anogona kuoneka kubva pamufananidzo uri pazasi, silicon iri pakati petetrahedron, uye nzvimbo dzema vertices mana etetrahedron anogarwa nemaatomu enitrogen, uyezve matatu ega ega tetrahedron anogovera atomu imwe, nguva dzose. kuwedzera munzvimbo ine mativi matatu. Pakupedzisira, iyo network network inoumbwa. 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 kupisa kuoma, 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 zvakanakira, saka ine yakakosha kukosha kwekushandisa munzvimbo yakanyanyisa senge tembiricha yepamusoro, kumhanya kwakanyanya, corrosive media yakasimba, uye inoonekwa seimwe yeanonyanya kuvimbisa zvimiro zveceramic zvinhu zvekusimudzira uye kushandisa, uye kazhinji inova sarudzo yekutanga mumashandisirwo mazhinji anoda kuyedzwa.
Nguva yekutumira: Aug-15-2023