Kev sib xyaw ntawm Friction Material Formulations (1)
Structure ntawm kev sib txhuam khoom
Cov khoom sib txhuam yog cov khoom siv polymer ternary composite, uas muaj peb ntu:
(1) Siv cov khoom sib xyaw polymer ua cov ntawv khi;
(2) Siv cov inorganic lossis organic fibers ua cov khoom txhawb zog;
(3) Siv cov fillers ua kev sib txhuam los yog cov tshuaj sib xyaw ua ke.
1. Binder
Cov organic binders siv rau hauv cov ntaub ntawv sib txhuam yog phenolic resins thiab hluavtaws roj hmab, thiab phenolic resins yog cov tseem ceeb. Lawv cov yam ntxwv thiab kev ua haujlwm yog tias thaum lawv nyob ntawm qee qhov cua sov, lawv ua ntej muag muag thiab tom qab ntawd nkag mus rau hauv lub xeev cov dej khov, ua kom muaj dej ntws thiab sib npaug hauv cov khoom los tsim cov khoom siv matrix, thiab thaum kawg los ntawm cov roj hmab vulcanization ntawm resin. kho, cov fibers thiab fillers yog bonded. Ua ke, nws ua rau cov khoom sib txhuam nrog cov khoom sib txhuam nrog lub zog tuab, muaj zog thiab tuaj yeem ua tau raws li cov kev xav tau ntawm cov khoom sib txhuam.
Rau cov ntaub ntawv sib txhuam, qhov kub tsis kam ntawm cov resin thiab roj hmab yog qhov tseem ceeb ntawm kev ua tau zoo. Vim hais tias thaum lub tsheb thiab cov tshuab ua haujlwm braking thiab kis tau tus mob, cov ntawv sib txhuam yog nyob rau hauv qhov kub thiab txias ntawm li 200 degree txog 450 degree. Hauv qhov ntsuas kub no, feem ntau ntawm cov fibers thiab fillers yog hom inorganic thiab thermal decomposition tsis tshwm sim. Rau cov resins, rubbers, thiab organics, lawv nkag mus rau hauv cheeb tsam thermal decomposition. Nyob rau lub sijhawm no, ntau yam kev ua tau zoo ntawm cov ntaub ntawv sib txhuam feem ntau yuav raug hloov pauv tsis zoo (kev sib txhuam coefficient, hnav, txhua yam muaj zog, thiab lwm yam), tshwj xeeb tshaj yog peb cov cua sov (thermal decay, thermal expansion, thermal cracking) uas tshwm sim thaum lub sij hawm kuaj thiab siv. cov khoom sib txhuam. Phenomenon, nws cov hauv paus ntsiab lus yog tshwm sim los ntawm thermal decomposition ntawm resin, roj hmab thiab organic. Yog li ntawd, kev xaiv ntawm resin thiab roj hmab plays lub luag haujlwm tseem ceeb hauv kev ua haujlwm ntawm cov khoom sib txhuam. Kev xaiv ntawm cov binders sib txawv yuav ua rau muaj kev sib txhuam sib txawv thiab cov khoom siv. Phenolic resins thiab lawv cov hloov kho resins tam sim no siv. Xws li: hloov cov txiv ntoo txiv ntoo plhaub roj, hloov cov hmoov nitrile, hloov roj hmab thiab lwm yam hloov phenolic resin ua cov ntaub ntawv sib txhuam.
