Silicon nitride yog cov khoom siv ua haujlwm siab ceramic paub txog nws cov khoom siv zoo heev thiab thermal. Ib qho tseem ceeb ntawm cov cuab yeej cuab tam uas txhais tau tias nws tus cwj pwm nyob rau hauv load yog lub elastic modulus, kuj hu ua Young's modulus. Lub elastic modulus yog ib qho kev ntsuas ntawm cov khoom tawv thiab nws lub peev xwm los deform nyob rau hauv kev ntxhov siab. Nyob rau hauv cov ntaub ntawv ntawm silicon nitride, nws elastic modulus plays lub luag hauj lwm tseem ceeb hauv kev txiav txim siab nws haum rau ntau yam kev siv, xws li los ntawm cov khoom siv mus rau cov khoom siv hluav taws xob siab heev.
Nws cov qauv crystalline, muaj pes tsawg leeg, thiab kev ua haujlwm tsuas yog qee qhov kev hloov pauv uas cuam tshuam rau silicon nitride lub elastic modulus. Silicon nitride muaj nyob rau hauv ntau hom polymorphic, nrog rau feem ntau yog alpha () thiab beta () theem. Lub elastic modulus tuaj yeem sib txawv ntawm cov theem no, thiab nws yog ib qho tseem ceeb uas yuav tau xav txog cov theem tshwj xeeb thaum tham txog cov khoom siv lub zog.
Elastic Modulus ntawm -Si3N4
Nyob rau hauv alpha theem ntawm silicon nitride, uas tseem hu ua hexagonal silicon nitride (h-Si3N4), cov elastic modulus sib txawv raws cov crystallographic axes. Lub anisotropic xwm ntawm alpha-theem silicon nitride txhais tau hais tias nws elastic modulus yuav txawv nyob ntawm seb cov kev taw qhia ntawm cov kev nyuaj siab thov. Qhov no anisotropy tuaj yeem ua tau zoo nyob rau hauv cov ntawv thov uas cov khoom siv tshwj xeeb xav tau nyob rau hauv ntau cov lus qhia.
Elastic Modulus ntawm -Si3N4
Ntawm qhov tod tes, beta-theem silicon nitride (-Si3N4) yog tus cwj pwm los ntawm cov qauv elastic dua piv rau alpha theem. Qhov no ua rau beta-theem silicon nitride haum rau cov ntawv thov kom txhim kho qhov tawv thiab lub zog. Lub elastic modulus ntawm beta-theem silicon nitride feem ntau yog nyob rau hauv thaj tsam ntawm 300-350 GPa, qhia tau hais tias nws impressive txhua yam khoom.
Cov yam ntxwv cuam tshuam rau Elastic Modulus
Cov txheej txheem tsim khoom kuj tseem ua lub luag haujlwm tseem ceeb hauv kev txiav txim siab elastic modulus ntawm silicon nitride. Cov yam ntxwv xws li sintering kub, siab, thiab qhov sib ntxiv ntawm cov khoom siv sintering tuaj yeem cuam tshuam qhov kawg ntawm cov khoom siv. Txhawm rau muab piv txwv, ntxiv yttria (Y2O3) thaum lub sijhawm sintering tuaj yeem ua rau silicon nitride denser, uas ua rau cov khoom siv zoo dua qub xws li cov qauv ntau dua ntawm elasticity.
Kev siv ntawm Silicon Nitride
Lub siab elastic modulus ntawm silicon nitride ua rau nws tshwj xeeb tshaj yog haum rau cov qauv kev siv qhov chaw nruj thiab lub zog tseem ceeb. Nyob rau hauv engineering thiab aerospace daim ntawv thov, silicon nitride Cheebtsam yog ua hauj lwm nyob rau hauv tej yam kev mob uas xav kom tiv thaiv kub, corrosion, thiab hnav. Cov khoom muaj peev xwm tswj tau nws cov neeg kho tshuab kev ncaj ncees nyob rau hauv huab cua yog ntaus nqi rau nws cov elastic modulus siab.
Hauv kev siv hluav taws xob thiab khoom siv hluav taws xob, silicon nitride yog siv los ua cov khoom siv hluav taws xob vim nws cov khoom siv hluav taws xob zoo heev thiab cov khoom siv hluav taws xob siab. Nws cov thermal expansion coefficient qis kuj tseem ua rau nws siv hauv kev ntim khoom hluav taws xob, qhov chaw ruaj khov nyob rau hauv qhov sib txawv ntawm qhov kub thiab txias yog qhov tseem ceeb.
Hauv kev xaus, qhov elastic modulus ntawm silicon nitride yog qhov tseem ceeb hauv kev txiav txim siab nws tus cwj pwm thiab kev tsim nyog rau ntau yam kev siv. Lub anisotropic xwm ntawm -Si3N4 thiab txhim khu kev nruj ntawm -Si3N4 muab engineers thiab cov kws tshawb fawb nrog cov kev xaiv los txiav cov khoom cov khoom raws li cov kev cai tshwj xeeb. Kev ua tib zoo xav txog kev ua tsis tau ntxiv tso cai rau kev ua kom zoo dua ntawm cov qauv elastic, ua silicon nitride yog cov khoom siv ntau yam thiab ua haujlwm siab hauv ntau hom kev siv thev naus laus zis.
