Kev sib xyaw ntawm Friction Material Formulations (3)
3. Ntim
Cov muab tub lim nyob rau hauv cov khoom siv sib txhuam yog tsim los ntawm kev sib txhuam kev ua tau zoo regulator thiab compounding agent. Lub hom phiaj ntawm kev siv fillers feem ntau suav nrog cov hauv qab no:
(1) Kho thiab txhim kho kev sib txhuam kev ua tau zoo, lub cev muaj zog thiab lub zog ntawm cov khoom siv.
(2) Tswj cov coefficient ntawm thermal expansion, thermal conductivity, thiab shrinkage ntawm cov khoom kom nce stability ntawm cov khoom loj.
(3) Txhim kho lub suab nrov nres ntawm cov khoom.
(4) Txhim kho cov txheej txheem tsim khoom thiab kev ua haujlwm ntawm cov khoom.
(5) Txhim kho qhov zoo thiab qhov 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 fillers yuav tsum to taub qhov kev ua tau zoo ntawm cov fillers thiab lub luag hauj lwm lawv ua si nyob rau hauv ntau yam yam ntxwv ntawm kev sib txhuam cov ntaub ntawv. Kev siv cov fillers kom raug txiav txim siab qhov ua tau zoo ntawm cov ntaub ntawv sib txhuam thiab tseem ceeb heev hauv kev tsim khoom.
Raws li kev ua haujlwm ntawm kev sib txhuam kev ua haujlwm ntawm cov khoom siv sib txhuam, nws tuaj yeem muab faib ua ob hom: "kev sib txhuam-ua kom muaj zog" thiab "kev sib txhuam-txo cov muab tub lim". Cov khoom siv sib txhuam nws tus kheej yog cov khoom siv sib txhuam, uas yuav tsum muaj kev sib txhuam coefficient siab txhawm rau ua haujlwm braking thiab kis tau tus mob, yog li kev sib txhuam-ntau ntxiv muab tub lim yog qhov tseem ceeb ntawm kev sib txhuam kev ua haujlwm hloov. Qhov kev sib txhuam nce cov nyhuv ntawm cov fillers sib txawv.
Lub Mohs hardness ntawm kev sib txhuam-ntau ntxiv muab tub lim feem ntau yog 3-9. Kev sib txhuam-nce cov nyhuv ntawm siab hardness yog pom tseeb. Fillers nrog lub hardness siab tshaj 5.5 yog ib qho nyuaj fillers, tab sis lawv cov npaum li cas thiab particle loj yuav tsum tau tswj. (xws li alumina, zircon, thiab lwm yam)
Anti-kev sib txhuam muab tub lim: Feem ntau, nws yog cov khoom uas tsis tshua muaj zog, ib qho ntxhia nrog hardness qis dua 2 ntawm Mohs nplai. Xws li: graphite, molybdenum disulfide, talcum hmoov, mica, thiab lwm yam Nws tuaj yeem tsis tsuas yog txo cov coefficient ntawm kev sib txhuam, tab sis kuj txo qhov hnav ntawm cov khoom siv mating, yog li ua rau kev pab cuam lub neej ntawm cov khoom sib txhuam.
Cov khoom siv sib txhuam yog cov khoom siv tshwj xeeb uas ua haujlwm hauv qhov kub thiab txias, yog li nws yuav tsum tau siv cov khoom siv ua kom sov yuav tsum muaj cov cua sov zoo, uas yog, thermal stability, nrog rau cov teebmeem thermophysical thiab cov teebmeem thermochemical.
Lub ntim ntim ntawm cov muab tub lim 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 kuj muaj qhov sib txawv ntawm cov khoom ntim ntawm cov muab tub lim.
