Kev paub txog kev nthuav dav thermal ntawm cov khoom siv refractory

Kev paub txog thermal expansion ntawm cov ntaub ntawv refractory
Thermal expansion yog hais txog cov cuab yeej ntawm cov khoom siv refractory qhov twg lawv ntim lossis ntev nce nrog qhov kub thiab txias. Nws yog feem ntau qhia nyob rau hauv cov nqe lus ntawm linear expansion tus nqi thiab nruab nrab linear expansion coefficient, los yog hloov, nyob rau hauv cov nqe lus ntawm volumetric expansion tus nqi thiab volumetric expansion coefficient.
Lub coefficient ntawm thermal expansion yog qhov tseeb tsis yog tus nqi tas li; nws txawv nrog qhov kub thiab txias. Qhov feem ntau hais coefficient ntawm thermal expansion yog hais txog tus nqi nruab nrab nyob rau hauv ib qho kev ntsuas kub. Thaum siv lub tswv yim no, nws yog ib qho tseem ceeb uas yuav tsum tau ua tib zoo saib xyuas qhov ntsuas kub uas siv tau.
Lub thermal expansion zog ntawm cov ntaub ntawv yog ze ze rau lawv cov qauv thiab daim ntawv cog lus lub zog. Cov ntaub ntawv uas muaj cov ntawv cog lus siab ua kom pom cov thermal expansion coefficient tsawg (xws li cov ntaub ntawv SiC). Rau cov ntaub ntawv uas muaj tib yam muaj pes tsawg leeg, lawv cov thermal expansion coefficients sib txawv vim cov qauv sib txawv. Feem ntau, cov muaju nrog cov qauv compact muaj cov thermal expansion coefficients loj, thaum cov iav amorphous feem ntau muaj cov thermal expansion coefficients me me. Rau cov oxides nrog cov qauv ntim ntom ntom ntawm cov pa ions, cov kab tawm nthuav dav feem ntau yog loj. Nyob rau hauv non-isotropic crystals (tsis yog-equiaxed siv lead ua tshuab), anisotropy ntawm lawv thermal expansion yog tshwj xeeb, nrog rau sib txawv thermal expansion coefficients nyob rau hauv sib txawv siv lead ua axis qhia. Cov ntaub ntawv nrog cov qauv anisotropic heev nthuav qhia me me volumetric expansion coefficients.
Lub thermal expansion zog ntawm cov ntaub ntawv refractory nyob ntawm lawv cov tshuaj muaj pes tsawg leeg, ntxhia muaj pes tsawg leeg, thiab microstructure, thiab kuj sib txawv nrog cov kev hloov ntawm qhov kub thiab txias.
Lub thermal expansion ntawm cov ntaub ntawv refractory muaj qhov cuam tshuam ncaj qha rau lawv cov thermal shock resistance thiab volumetric stability, ua rau nws yog ib qho tseem ceeb uas yuav tsum tau xav txog thaum lub sij hawm tsim khoom (tsim lub tshuab hluav taws xob) thiab siv cov ntaub ntawv refractory. Rau cov ntaub ntawv refractory nrog siab thermal expansion thiab polycrystalline transformation, expansion pob qij txha yuav tsum tau tshwj tseg rau offset qhov kev nyuaj siab los ntawm thermal expansion vim lawv loj expansion ntawm kub. Linear expansion rate thiab linear expansion coefficient yog qhov tseem ceeb rau kev tsim thiab suav ntawm tag nrho cov qauv loj ntawm reserved expansion pob qij txha thiab masonry.
Muaj ob txoj hauv kev rau kev nthuav dav thermal nthuav dav ntawm cov ntaub ntawv refractory, uas yog lub teb chaws tus qauv GB / T 7320.1-2000 (txoj kev plunger) thiab lub teb chaws tus qauv GB / T 7320.2-2000 (telescope method). Cov qauv kev sim ntawm ob txoj hauv kev yog raws li hauv qab no: ua kom sov cov qauv mus rau qhov ntsuas qhov ntsuas kub ntawm qhov ntsuas qhov ntsuas kub nce, ntsuas qhov kev hloov pauv hauv cov qauv ntev raws li qhov ntsuas kub nce, thiab xam cov kab nthuav dav ntawm tus qauv raws li qhov kub thiab txias thiab qhov nruab nrab linear expansion coefficient nyob rau hauv qhov ntsuas kub ntau.