I. Cov yam ntxwv ntawm cov khoom thiab cov ntsiab lus xaiv
Tsawg cement castablesyog dav siv nyob rau hauv industrial furnace linings vim lawv zoo heev kev ua tau zoo. Cov khoom siv no ua tiav cov txiaj ntsig zoo los ntawm kev txo qis qhov siab ntawm - alumina cement ntxiv, ua rau muaj dej ntxiv thaum lub sij hawm tsim kho thiab txo cov ntsiab lus calcium hauv cov khoom tiav. Piv nrog rau cov tsoos siab alumina castables, nws tuaj yeem txuas ntxiv lub neej kev pab cuam ntawm lub hauv ob sab phlu. Cov qib sib txawv ntawm qis- cement castables yuav tsum raug xaiv raws li lub qhov cub ua haujlwm kub gradient los xyuas kom meej qhov sib txuam ntawm cov khoom siv nrog kev ua haujlwm.
II. Tej thaj chaw thov
Hauv cov cua kub cua sov, cov cement castables qis yog siv los ua cov khoom siv tseem ceeb xws li cov phab ntsa rauv, cov ru tsev, thiab cov khoom siv rov ua dua tshiab. Cov cheeb tsam no muaj kev ua haujlwm nyuaj thiab muaj cua sov siab. Kev siv qis- cement castables tsis tsuas yog ua tau raws li cov qauv kev xav tau ntawm lub zog tab sis kuj hloov mus rau qhov kub thiab txias hloov pauv, ua rau nws siv ntau tshaj plaws thiab muaj kuab heev hauv ob sab phlu tam sim no.
III. Lub luag haujlwm tseem ceeb ntawm lub tshuab ziab khaub ncaws
Tom qab lub castable yog tsim, nws yuav tsum tau mus rau ib tug nruj txheej txheem kom qhuav ua ntej nws yuav siv tau. Lub ntsiab lus ntawm lub tshuab ziab khaub ncaws yog qhov kev tso tawm ntawm cov dej noo los ntawm lub qhov cub hauv ob sab phlu: noo noo vaporizes raws li cua sov ntawm qhov chaw ntawm lub castable, thaum lub hauv paus ya raws migrate mus rau saum npoo raws li capillary channel, tsim ib tug nruam evaporation gradient. Vim tias cov castable muaj qhov tsis zoo permeability tom qab kev vibration, yog tias cov cua kub ceev heev, cov av noo noo evaporates sai heev thaum cov dej hauv sab hauv tsis tuaj yeem khiav tawm hauv lub sijhawm, ua rau muaj kev kub ntxhov hauv lub zog sab hauv. Thaum qhov nro tshaj qhov compressive lub zog ntawm cov khoom tsis muaj sintered, cov teeb meem loj xws li tawg thiab spalling yuav tshwm sim.
IV. Moisture Release Mechanism thiab Peb -Theem Temperature Control
Cov dej noo nyob rau hauv qis cement castables muaj ob ntu: dej dawb ntxiv thaum sib tov, thiab khi dej hauv cov cement hydrates thiab aggregates. Cov txheej txheem dehydration nthuav tawm cov theem sib txawv:
1. Thawj theem (20–200 degree): Feem ntau tshem tawm cov dej dawb; cua sov yuav tsum qeeb tshaj plaws.
2. Qhov thib ob theem (280-330 degree): Calcium aluminate hydrates pib decompose, thiab dej ntawm crystallization pib precipitate.
3. theem thib peb (480-550 degree): Mineral dej ntawm crystallization raug tshem tawm tag nrho; Lub cev qhuav dej yog qhov tseem ceeb ua tiav los ntawm 600 degree. Peb theem no yog cov tub ntxhais tswj cheeb tsam rau qhov cub kom qhuav; qhov ntsuas kub yuav tsum tau ua raws li nruj me ntsis, thiab ceev cua sov yuav tsum zam.
V. Rauv Drying Operation Specifications
Kev tshawb fawb lub tshuab ziab khaub ncaws yuav tsum ua raws li lub hauv paus ntsiab lus ntawm "kub khov kho tsis muaj qhov kub thiab txias regression." Xav txog cov yam ntxwv hydration ntawm calcium aluminate cement, dej dawb yuav tsum tau muab tshem tawm tag nrho ua ntej 300 degree, thiab dej crystallization yuav tsum tau muab tshem tawm ua ntej 550 degree. Qhov tseem ceeb tshaj plaws, tag nrho lub tshuab ziab khaub ncaws yuav tsum tsis pub tsawg tshaj 7 hnub. Lub sijhawm ntsuas kub txaus tso cai rau kev tshem tawm cov dej kom tiav, kom ntseeg tau tias qhov nro sab hauv ntawm lub casting tseem qis dua nws lub zog compressive tam sim ntawd, yog li ua tiav lub hom phiaj ntawm kev ceev, nyab xeeb, thiab siab - qhov cub kom qhuav, nteg lub hauv paus ruaj khov rau tom ntej ntev - lub sijhawm ua haujlwm ruaj khov.
