Cov yam ntxwv ntawm cov khoom sib txhuam
Cov fillers nyob rau hauv cov khoom ntawm kev sib txhuam cov ntaub ntawv feem ntau yog tsim los ntawm kev sib txhuam cov cuab yeej hloov kho thiab cov neeg ua hauj lwm koom tes. Lub hom phiaj ntawm kev siv cov fillers feem ntau yog nyob rau hauv cov hauv qab no:
(1) Txhawm rau kho thiab txhim kho cov khoom sib txhuam, cov khoom siv lub cev thiab lub zog ntawm cov khoom siv.
(2) Tswj cov coefficient ntawm thermal expansion, thermal conductivity, shrinkage, thiab nce stability ntawm cov khoom loj.
(3) Txhim kho lub suab nrov braking ntawm cov khoom.
(4) Txhim kho cov txheej txheem tsim khoom thiab kev ua haujlwm ntawm cov khoom.
(5) Txhim kho cov tsos zoo thiab ntom ntawm cov khoom.
(6) Txo cov nqi tsim khoom.
Nyob rau hauv cov qauv tsim ntawm cov ntaub ntawv kev sib txhuam, kev xaiv ntawm muab tub lim yuav tsum to taub qhov kev ua tau zoo ntawm cov muab tub lim thiab nws lub luag hauj lwm nyob rau hauv ntau yam yam ntxwv ntawm cov khoom sib txhuam. Kev siv cov fillers kom raug txiav txim siab qhov ua tau zoo ntawm cov khoom sib txhuam thiab tseem ceeb heev hauv kev tsim khoom.
Raws li lub luag haujlwm ntawm kev sib txhuam kev hloov pauv hauv cov ntaub ntawv sib txhuam, lawv tuaj yeem muab faib ua ob pawg: "cov khoom siv ntxiv" thiab "cov khoom siv txo qis". Cov khoom sib txhuam nws tus kheej belongs rau cov khoom siv kev sib txhuam, txhawm rau ua kom muaj peev xwm ua tau lub braking thiab kis tau tus mob yuav tsum muaj kev sib txhuam coefficient siab, yog li qhov kev sib txhuam nce muab tub lim yog qhov tseem ceeb ntawm kev sib txhuam kev ua haujlwm. Qhov kev sib txhuam nce cov nyhuv ntawm cov fillers sib txawv.
Mohs hardness ntawm kev sib txhuam nce muab tub lim yog feem ntau 3 ~ 9. Cov nyhuv ntawm kev sib txhuam nce yog pom tseeb yog tias lub hardness siab. 5.5 hardness muab tub lim yog ib qho nyuaj muab tub lim, tab sis nws yog tsim nyog los tswj nws npaum li cas thiab particle loj. (xws li txhuas oxide, zircon, thiab lwm yam)
Hnav txo cov muab tub lim: feem ntau cov khoom siv tsis tshua muaj zog, tsawg dua Mohs hardness ntawm 2 cov zaub mov. Xws li: graphite, molybdenum disulfide, talc, mica, thiab lwm yam.. Nws tuaj yeem txo qhov coefficient ntawm kev sib txhuam thiab txo qhov hnav ntawm cov khoom sib tw, yog li txhim kho lub neej kev pab cuam ntawm cov khoom sib txhuam.
Cov khoom sib txhuam yog cov khoom siv tshwj xeeb ua haujlwm nyob rau hauv ib puag ncig ntawm cov cua sov thiab siab dua, yog li nws yuav tsum tau siv cov khoom siv sib xyaw ua ke yuav tsum muaj cov cua sov zoo, piv txwv li thermal stability, nrog rau cov teebmeem thermophysical thiab cov teebmeem thermochemical.
Lub ntim ntim muaj qhov cuam tshuam zoo rau kev ua haujlwm ntawm cov khoom sib txhuam. Cov kev ua tau zoo sib txawv ntawm cov khoom siv sib txhuam, cov khoom ntim ntim cov khoom ntim kuj sib txawv.
