Cov qauv thiab muaj pes tsawg leeg ntawm cov khoom sib txhuam (1)
Cov khoom sib txhuam yog cov khoom siv polymer ternary sib xyaw, nws muaj peb ntu: (1) cov khoom siv polymer ua cov ntawv khi; (2) Qhov no inorganic lossis organic fiber ntau ua cov khoom tsis muaj zog; (3) mus rau lub muab tub lim raws li kev sib txhuam kev ua haujlwm regulator lossis compound.
1. Cov organic binder siv rau kev sib txhuam cov ntaub ntawv yog phenolic resin thiab roj hmab npaj, yog li phenolic resin feem ntau yog siv. Lawv cov yam ntxwv thiab cov teebmeem yog tias yog tias lawv nyob rau hauv ib qho kev ntsuas cua sov, lawv thawj zaug xoob thiab tom qab ntawd tig mus rau hauv cov kua dej khov, ua rau kev txav mus los thiab homogenizing lub matrix ntawm cov khoom los ntawm cov khoom. Thaum kawg, los ntawm cov roj hmab vulcanization ntawm resin curing, cov fiber ntau thiab cov muab tub lim yog sib koom ua ke. Txhawm rau tsim cov khoom siv tawv nrog lub zog loj thiab tuaj yeem ua tau raws li qhov kev ua tau zoo ntawm cov khoom sib txhuam pom zoo cov khoom siv sib txhuam. Rau cov ntaub ntawv sib txhuam, qhov kub tsis kam ntawm resin thiab roj hmab yog qhov tseem ceeb ntawm kev ua tau zoo. Vim tias lub tsheb thiab cov tshuab hauv kev sib tsoo thiab kev sib kis ua haujlwm, cov phaj sib txhuam hauv 200 degree ~ 450 degree nyob rau hauv qhov kub thiab txias. Hauv qhov ntsuas kub no, qhov tseem ceeb ntawm cov fiber ntau thiab muab tub lim yog hom inorganic, tsis txhob tawg thermal decomposition. Yog li rau cov resins thiab rubbers, cov organic, lawv kuj txav mus rau hauv qhov chaw thermal decomposition. Nyob rau lub sijhawm no, ntau yam kev ua tau zoo ntawm cov ntaub ntawv sib txhuam yuav rhuav tshem cov kev hloov pauv zoo (kev sib txhuam coefficient, kev puas tsuaj, lub zog ntawm lub zog, thiab lwm yam), tshwj xeeb tshaj yog peb qhov txias (thermal decay, thermal expansion, thermal cracking) tshwm sim nyob rau hauv cov txheej txheem ntawm kev tshawb nrhiav thiab siv. ntawm cov ntaub ntawv sib txhuam, uas yog tshwm sim los ntawm thermal decomposition ntawm resin, roj hmab thiab cov ntaub ntawv organic. Yog li ntawd, kev xaiv cov resin thiab roj hmab rau kev ua haujlwm ntawm cov ntaub ntawv sib txhuam muaj lub luag haujlwm tseem ceeb heev. Kev siv cov binders sib txawv yuav ua rau muaj qhov sib txawv ntawm kev sib txhuam thiab cov khoom siv. Phenolic resin thiab hloov resin yog siv tam sim no. Xws li: cashew plhaub roj hloov, nitrile hmoov hloov, roj hmab hloov thiab lwm yam hloov phenolic resin raws li ib tug sib txhuam cov ntaub ntawv binder. Cov kev xav tau zoo rau cov resin yog: (1) tsis zoo thaum tshav kub kub ua hauj, kuj tsis zoo thermal decomposition kub thiab kuj thermal poob phaus. (2) powdery resin fineness yog tsawg, feem ntau 100 ~ 200 mesh, qhov phem tshaj yog ntau tshaj 200 mesh, pab mus rau lub uniformity ntawm mixing concentration, yuav txo tau tus nqi ntawm resin nyob rau hauv lub mis. (3) Cov ntsiab lus ntawm cov hmoov dawb yog siab, thiab 1 feem pua ~ 3 feem pua yog qhov tsim nyog. (4) Tsim nyog kho ceev 40s ~ 60s (150 degree) thiab ntws nrug (120 degree 40 ~ 80mm)
