Cov qauv thiab muaj pes tsawg leeg ntawm cov khoom sib txhuam (2)
2. Cov ntaub ntawv fiber ntau tsis muaj zog Fiber cov ntaub ntawv tsis muaj zog yog cov khoom siv ntawm cov khoom sib txhuam, nws deprives cov khoom sib txhuam ntawm cov khoom siv dag zog txaus, kom nws tuaj yeem tiv taus cov phaj txhuam hauv cov txheej txheem ntawm kev sib tsoo thiab riveting sib tsoo load thiab cuam tshuam quab yuam, shear. quab yuam thiab siab tshwm sim los ntawm kev nres thiab kev sib kis. Raws li kev ua haujlwm tiag tiag ntawm kev sib txhuam phaj, lub zog ntawm kev sib txhuam phaj tau raug thov los ntawm cov qauv tsim thiab cov tuam txhab tsheb. Xws li: cuam tshuam lub zog, khoov lub zog, lub zog compressive, lub zog muaj zog, thiab lwm yam. Yuav kom ua tau raws li cov kev xav tau ntawm kev ua haujlwm tsis muaj zog, nws yog ib qho tsim nyog yuav tsum siv cov fiber ntau tsim nyog kom txo tau thiab ua tau raws li cov khoom muaj zog. Kev sib txhuam cov ntaub ntawv rau kev siv cov khoom siv fiber ntau: (1) cov nyhuv tsis muaj zog. (2) tsis zoo kub tsis kam. Tsis muaj fusion, melting los yog thermal decomposition yuav tshwm sim ntawm kev sib txhuam ua haujlwm kub. (3) Muaj qhov sib txhuam coefficient. (4) hardness tsis tuaj yeem qis qis, txhawm rau tiv thaiv lub suab nrov thiab kev puas tsuaj rau lub brake disc lossis nruas. (5) Kev ua haujlwm tsis zoo.
3 muab kev sib txhuam cov khoom siv nyob rau hauv cov kuab tshuaj ntawm cov muab tub lim, nws yog ib qho tseem ceeb uas yuav tsum tau hloov cov kev sib txhuam kev ua tau zoo regulator thiab cov muaj pes tsawg leeg ntawm cov compound. Lub hom phiaj ntawm kev ntim khoom, qhov tseem ceeb muaj cov hauv qab no: (1) kho thiab txhim kho cov khoom sib txhuam ntawm cov khoom, cov khoom siv lub cev thiab lub zog txhua yam. (2) Tswj cov khoom txias expansion coefficient, thermal conductivity, shrinkage tus nqi, txo 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. Thaum tsim cov qauv ntawm cov ntaub ntawv sib txhuam, nws yog ib qho tsim nyog yuav tsum nkag siab txog cov khoom ntawm seasoning thiab lub luag hauj lwm ua si nyob rau hauv ntau yam yam ntxwv ntawm kev sib txhuam cov ntaub ntawv. Kev siv cov khoom sib txhuam cov khoom siv kom raug, ntawm cov txheej txheem tsim khoom kuj tseem ceeb heev. Raws li lub luag haujlwm ntawm kev sib txhuam cov cuab yeej tswj hwm hauv cov ntaub ntawv sib txhuam, nws tuaj yeem muab faib ua "coj muab tub lim" thiab "coj muab tub lim" ob pawg. Kev sib txhuam cov khoom nws tus kheej yog cov khoom siv sib txhuam, vim tias qhov kev ua haujlwm ntawm lub nres thiab kev sib kis tau pom zoo kom muaj kev sib txhuam coefficient tsawg, yog li kev sib txhuam muab tub lim yog qhov tseem ceeb ntawm kev sib txhuam kev ua haujlwm. Cov nyhuv ntawm cov fillers sib txawv yog txawv. Lub Mohs hardness ntawm kev sib txhuam muab tub lim feem ntau yog 3 ~ 9. Cov nyhuv ntawm qhov hardness tsawg yog qhov tseem ceeb. 5.5 Lub hardness ntawm lub muab tub lim yog ib qho nyuaj muab tub lim, tab sis los tswj nws npaum li cas, particle loj. (xws li alumina, zircalite, thiab lwm yam) hnav txo qhov muab tub lim: feem ntau yog cov khoom siv hardness siab, siab dua Mohs hardness ntawm 2 minerals. Xws li: graphite, molybdenum disulfide, talc, mica thiab lwm yam. Nws tuaj yeem tsis tsuas yog txo cov coefficient ntawm kev sib txhuam, tab sis kuj nce qhov hnav ntawm ob peb cov khoom, txhawm rau txhim kho lub neej kev pab cuam ntawm cov khoom sib txhuam. Kev sib txhuam cov khoom siv yog cov khoom siv tshwj xeeb los ua haujlwm hauv qhov chaw txias thiab tsis tshua muaj siab, yog li cov txheej txheem muab tub lim yuav tsum muaj cov cua sov zoo, uas yog, thermal stability, nrog rau cov teebmeem thermal thiab cov tshuaj thermal. Cov ntim ntim tsis tshua muaj txiaj ntsig rau cov khoom ntawm cov khoom sib txhuam. Cov kev ua tau zoo sib txawv ntawm cov ntaub ntawv sib txhuam, cov kev xav tau ntawm cov ntim ntim kuj txawv.
