Si3N4 yog qhov sib xyaw ua ke raws li covalent bonds. Cov ntawv cog lus muaj zog thiab cov kev taw qhia ntawm cov ntawv cog lus muaj zog. Kev tsim thiab kev tsiv teb tsaws ntawm qhov tsis xws luag hauv cov qauv xav tau ntau lub zog, uas yog, qhov tsis xws luag diffusion coefficient tsawg (tsis zoo) thiab nws nyuaj rau sinter. Ntawm lawv, covalent daim ntawv cog lus Si-N tivthaiv yog 70% thiab ionic daim ntawv cog lus yog 30%. Nyob rau tib lub sijhawm, vim tias cov qauv ntawm Si3N4 nws tus kheej tsis ntom txaus, txhawm rau txhim kho kev ua haujlwm, yuav tsum tau ntxiv me me ntawm oxide sintering pab, thiab nws yog densified los ntawm cov kua theem sintering.
Si3N4 muaj ob daim ntawv siv lead ua, ib qho yog -Si3N4, acicular crystals, dawb los yog off-dawb, thiab lwm yam yog -Si3N4, tsaus xim, nyob rau hauv daim ntawv ntawm ntom granular polyhedrons los yog luv prisms. Ob leeg yog hexagonal siv lead ua tshuab, thiab ob qho tib si yog peb-dimensional spatial tes hauj lwm uas muaj li ntawm [SiN4]4-tetrahedrons sib koom vertex fab.
Ntawm qhov kub thiab txias, theem yog thermodynamically ruaj khov, yog li cov theem hloov mus rau theem thiab hloov mus rau theem. Yog li ntawd, thaum Si3N4 hmoov nrog cov theem siab cov ntsiab lus yog sintered, nplua-grained, ntev columnar -Si3N4 nplej tau, uas txhim kho cov pob txha toughness ntawm cov khoom. Txawm li cas los xij, kev loj hlob txawv txav ntawm cov khoom yuav tsum tau tswj xyuas thaum lub sij hawm ceramic sintering, ua rau lub qhov hws, tawg, thiab dislocation defects tshwm sim thiab dhau los ua qhov chaw ntawm cov khoom tawg.
