Thermal shock resistance, tseem hu ua thermal shock resistance, feem ntau hu ua thermal stability. Nws hais txog lub peev xwm ntawm cov ntaub ntawv insulator thiab cov khoom tiav los tiv thaiv kev hloov pauv ntawm qhov kub thiab txias yam tsis muaj kev puas tsuaj lossis kev puas tsuaj. Thaum cov ntaub ntawv insulator thiab lawv cov khoom tau txais qhov kub thiab txias gradients tshwm sim los ntawm kev hloov pauv ntawm qhov kub thiab txias, thermal stress yuav tshwm sim hauv cov khoom vim kev cuam tshuam ntawm shrinkage lossis expansion. Thaum lub thermal kev nyuaj siab tshaj lub zog txwv ntawm cov khoom, tawg, puas, thiab txo cov neeg kho tshuab zog yuav tshwm sim.
Insulator thermal shock resistance test
Kev cuam tshuam
Lub ntsiab tseem ceeb uas cuam tshuam rau cov thermal shock tsis kam ntawm cov insulators yog cov khoom siv ntawm lub insulator, xws li cov khoom siv thermal expansion coefficient, thermal conductivity, elastic modulus, cov khoom muaj zog, tawg toughness, thiab lwm yam.
Feem ntau hais lus, qhov me me ntawm thermal expansion coefficient, qhov me me ntawm qhov hloov pauv ntawm cov khoom vim qhov kub hloov pauv, qhov sib xws ntawm qhov ntsuas kub me me, thiab qhov zoo dua thermal shock resistance; qhov loj dua qhov thermal conductivity, qhov me me qhov sib txawv ntawm qhov kub hauv cov khoom, thiab qhov me me qhov sib txawv ntawm qhov kub ntawm qhov sib txawv ntawm qhov kub thiab txias. Qhov me dua qhov sib txawv ntawm kev ntxhov siab, qhov zoo dua thermal shock kuj; qhov siab dua lub zog ntawm cov khoom siv, qhov ntau dua lub zog nws tuaj yeem tiv taus thermal kev nyuaj siab yam tsis muaj kev puas tsuaj, thiab qhov zoo dua thermal shock kuj; Qhov loj dua elastic modulus, qhov me dua elasticity, thiab ntau dua elastic deformation ntawm cov khoom. Nws yog qhov me me dhau los daws thiab tso cov kev ntxhov siab thermal, uas ua rau muaj kev puas tsuaj rau thermal shock resistance.
Txoj kev los txhim kho cov thermal shock kuj
Lub thermal shock tsis kam ntawm cov khoom siv insulator yog ib qho kev qhia dav dav ntawm nws cov khoom siv hluav taws xob thiab thermal. Yog li ntawd, qee qhov thermal thiab mechanical tsis, xws li linear expansion coefficient, thermal conductivity, elastic modulus, thiab tawg zog, yog lub ntsiab yam tseem ceeb uas cuam tshuam rau thermal shock resistance ntawm insulators. parameter. Kev ntsuas los txhim kho cov thermal poob siab tawg tsis kam ntawm cov ntaub ntawv insulator feem ntau yog ua raws li qhov cuam tshuam ntawm ntau yam kev ua haujlwm tsis muaj feem cuam tshuam nrog cov thermal shock tawg tsis kam ntawm thermal stability.
(1) Ua kom cov khoom siv zog σ, txo cov elastic modulus E, thiab nce σ / E. Qhov no txhais tau hais tias cov khoom ua tau yooj yim dua thiab tuaj yeem nqus tau ntau lub zog elastic zog yam tsis muaj kev tawg, yog li txhim kho thermal stability. Thermal stress yog qhov muaj nuj nqis ntxiv ntawm qhov elastic modulus. Feem ntau, lub elastic modulus nce nrog qhov nce ntawm atomic valence thiab txo qis ntawm atomic radius. Yog li ntawd, xaiv cov tshuaj tsim nyog yog ib txoj hauv kev los tswj cov elastic modulus ntawm cov ntaub ntawv.
(2) Txo cov linear expansion coefficient ntawm cov khoom. Lub linear expansion ntawm cov khoom siv yog tshwm sim los ntawm thermal vibration ntawm atoms. Qhov sib npaug sib npaug hauv cov siv lead ua yog txiav txim siab los ntawm lub zog muaj peev xwm ntawm cov atoms. Raws li qhov kub thiab txias, qhov kev co ntawm cov atoms intensifies, thiab sib txuas expansion ntawm atomic spacing qhia macroscopic linear expansion. Cov ntaub ntawv nrog me me yuav ua rau me me thermal stress nyob rau hauv tib qhov kub sib txawv.
(3) Ua kom cov thermal conductivity λ ntawm cov khoom. Cov ntaub ntawv nrog loj λ hloov cua sov sai, uas tuaj yeem txo thiab sib npaug ntawm qhov sib txawv ntawm qhov kub thiab txias ntawm sab hauv thiab sab nraud ntawm cov khoom, yog li txo qhov sib xyaw ntawm lub sij hawm luv luv thermal. Cov ntaub ntawv zoo thermal shock yuav tsum feem ntau muaj thermal conductivity.
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