Zvigadzirwa zvesimbi zvinoreva rudzi rwezviumbwa zvesimbi zvine hunhu hwakakosha hwemakanika, hwemuviri kana hwemakemikari, zvinhu zvakashandiswa uye tekinoroji yekugadzira inodiwa zvakasiyana zvikuru nezviumbwa zvesimbi zvakajairika uye budiriro. Zvichienderana nehunhu uye mashandisirwo, zviumbwa zvesimbi zvinogona kukamurwa muzvikamu zviviri: zviumbwa zvesimbi uye zviumbwa zvinoshanda. Pakati pazvo, zviumbwa zvesimbi zvinoreva zviumbwa zvesimbi zvinogona kushandiswa sezvinhu zvekuvaka zveinjiniya, izvo zvinowanzova nesimba guru, kuomarara kwakanyanya, modulus yakakwira, kuramba kupisa kwakanyanya, kuramba kupfeka, kuramba ngura, kuramba oxidation, kuramba kupisa shock nezvimwe hunhu.
Kune mhando dzakawanda dzezviumbwa zveceramic, zvakanakira nezvakaipira, uye nzira yekushandisa zvakanakira nezvakaipira zvakasiyana, pakati pazvo "silicon nitride ceramics" nekuda kwekuenzana kwekushanda mumativi ese, inozivikanwa seyakanakisa kushanda kwakakwana mumhuri yezviumbwa zveceramics, uye ine mhando dzakasiyana dzemashandisirwo.
Mabhenefiti e silicon nitride ceramics
Silicon nitride (Si3N4) inogona kukamurwa kuita ma covalent bond compounds, [SiN4] 4-tetrahedron seyuniti yekuvaka. Nzvimbo dzakananga dze nitrogen ne silicon atoms dzinogona kuonekwa kubva pamufananidzo uri pazasi, silicon iri pakati pe tetrahedron, uye nzvimbo dze vertices ina dze tetrahedron dzinogarwa nema nitrogen atoms, uye tetrahedron nhatu dzese dzinogovana atomu imwe, dzichigara dzichitambanuka munzvimbo ine mativi matatu. Pakupedzisira, network structure inoumbwa. Hunhu hwakawanda hwe silicon nitride hwakabatana nechimiro ichi che tetrahedron.
Kune zvivako zvitatu zve silicon nitride zvine makristaro, zvinova α, β uye γ phases, izvo α uye β phases ndiwo marudzi akajairika e silicon nitride. Nekuti maatomu e nitrogen akabatana zvakasimba, silicon nitride ine simba rakanaka repamusoro, kuomarara kwakanyanya uye kuramba kupisa kwakanyanya, uye kuomarara kunogona kusvika HRA91 ~ 93; Kuomarara kwakanaka, kunogona kutsungirira kupisa kwakanyanya kwe1300 ~ 1400℃; Kuita makemikari madiki ne carbon nesimbi zvinotungamira kune low friction coefficient; Inozvizora yoga uye nekudaro haigone kupfeka; Kuramba ngura kwakasimba, pamusoro pe hydrofluoric acid, haiite pamwe chete nedzimwe inorganic acids, kupisa kwakanyanya kunewo oxidation resistance; Inewo thermal shock resistance yakanaka, kutonhora kwakanyanya mumhepo uye kupisa kwakanyanya hakuzoputsiki; Kufamba kwe silicon nitride ceramics kunoderera pakupisa kwakanyanya, uye slow plastic deformation idiki pasi pesimba rekupisa kwakanyanya uye mutoro wakagadzika.
Pamusoro pezvo, silicon nitride ceramics dzinewo simba rayo guru, high specific mode, high thermal conductivity, hunyanzvi hwemagetsi hwakanaka nezvimwe zvakanakira, saka ine kukosha kwakakosha kwekushandiswa munzvimbo dzakanyanya dzakadai sekupisa kwakanyanya, kumhanya kwakanyanya, ngura yakasimba, uye inoonekwa seimwe yezvinhu zveceramic zvinovimbisa zvikuru zvekugadzirwa nekushandiswa, uye inowanzova sarudzo yekutanga muzvishandiso zvakawanda zvinoda kuyedzwa.
Nguva yekutumira: Nyamavhuvhu-15-2023