Silicon Nitride nrog cov yam ntxwv tshwj xeeb

Raws li cov khoom siv refractory, silicon nitride muaj cov txiaj ntsig tshwj xeeb, uas ua rau nws siv dav hauv ntau qhov chaw lag luam.

Silicon nitride tsis muaj melting point thiab sublimates thiab decomposes ntawm 1900 degree nyob rau hauv ib txwm siab, uas ua rau nws ruaj khov nyob rau hauv ib puag ncig kub. Silicon nitride cov ntaub ntawv tuaj yeem tswj tau lub zog siab txawm tias qhov kub thiab txias, nrog rau qhov kub thiab txias deformation me me, qhov kub siab me me creep thiab zoo kub stability. Nws qhov kub siab khoov lub zog tuaj yeem ncav cuag ntau txhiab megapascals. Thaum silicon nitride ceramics yog oxidized, ib tug tuab silicon dioxide zaj duab xis yog yooj yim tsim rau saum npoo, uas tiv thaiv nws los ntawm oxidation ntxiv. Nws cov oxidation kuj kub tuaj yeem ncav cuag 1400 degree, thiab nws tuaj yeem siv mus txog 1870 degree hauv qhov chaw txo qis.

Lub hardness ntawm silicon nitride yog siab heev, xws li ntawm 9 mus rau 9.5, thib ob tsuas yog rau ob peb superhard cov ntaub ntawv xws li pob zeb diamond thiab BN. Nyob rau tib lub sij hawm, silicon nitride ceramics muaj siab tawg toughness thiab chav kub lub zog. Silicon nitride ceramics muaj qhov sib txhuam me me, nws tus kheej lubricating zog, thiab hnav tsis kam, uas yuav pab txo qis hnav thiab siv zog ntawm cov khoom siv thaum ua haujlwm. Silicon nitride muaj cov coefficient tsawg ntawm linear expansion, uas pab txo kev ntxhov siab los ntawm thermal expansion nyob rau hauv high-temperature ib puag ncig thiab txhim kho nws thermal shock kuj. Silicon nitride muaj cov thermal conductivity zoo, uas pab cov cuab yeej ua kom muaj qhov sib txawv ntawm qhov kub thiab txias thiab tsis txhob muaj cua sov hauv zos.

Silicon nitride yog tshuaj lom neeg ruaj khov thiab tsis corroded los ntawm ib qho inorganic acid tsuas yog hydrofluoric acid. Nws tuaj yeem muaj nyob ruaj khov hauv qee qhov alkalis. Qhov no ua rau silicon nitride refractory cov ntaub ntawv ruaj khov nyob rau hauv ntau yam tshuaj ib puag ncig. Silicon nitride tsis ntub dej kub cov ntsiab lus hlau thiab molten slag, yog li nws muaj kev tiv thaiv zoo rau slag corrosion. Cov khoom siv silicone nitride muaj cov khoom rwb thaiv tsev zoo thiab yog cov khoom siv insulator zoo ntawm qhov kub thiab txias. Silicon nitride ceramics tuaj yeem ua kom tiav cov duab uas xav tau, precision, thiab nto tiav, uas pab ua kom tau raws li qhov yuav tsum tau muaj ntawm cov chaw lag luam sib txawv rau cov duab thiab qhov tseeb ntawm cov khoom siv refractory. Vim yog cov khoom zoo tshaj plaws uas tau hais los saum toj no, silicon nitride tau suav tias yog cov khoom siv hluav taws xob kub kub nrog kev txhim kho zoo.

Hauv cov ntsiab lus, silicon nitride ua cov khoom siv refractory muaj ntau yam zoo, nrog rau kev ua haujlwm kub zoo, cov khoom siv zoo thiab nws tus kheej lubricating zog, zoo heev thermophysical zog, muaj zog tshuaj stability, zoo heev hluav taws xob zog thiab machinability. Cov txiaj ntsig zoo no tau ua rau silicon nitride tau siv dav hauv ntau qhov chaw lag luam xws li steel, non-ferrous hlau smelting, kiln cov ntaub ntawv, thiab lwm yam.

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