Dab tsi yog Silicon Carbide, Dab tsi yog Kev Siv Silicon Carbide?

Silicon carbide (SiC) yog tsim los ntawm quartz xuab zeb, roj av coke (los yog coke coke), ntoo chips (ntsev yuav tsum tau tsim ntsuab silicon carbide) thiab lwm yam raw cov ntaub ntawv los ntawm kub kub smelting los ntawm lub qhov cub tsis kam. Silicon carbide kuj muaj nyob rau hauv cov xwm li ib tug tsawg mineral, moissanite. Silicon carbide tseem hu ua carbonite. Nyob rau hauv tam sim no C, N, B thiab lwm yam uas tsis yog-oxide high-tech refractory raw cov ntaub ntawv, silicon carbide yog siv dav tshaj plaws, tus nqi pheej yig tshaj plaws, tuaj yeem hu ua kub steel xuab zeb lossis cov xuab zeb refractory. Tam sim no, Tuam Tshoj txoj kev lag luam ntawm silicon carbide tau muab faib ua dub silicon carbide thiab ntsuab silicon carbide ob yam, yog hexagonal crystals, lub ntiajteb txawj nqus ntawm 3.20 ~ 3.25, microhardness ntawm 2840 ~ 3320kg / mm2.

Cov mis mos molecular yog SiC, nws hardness yog nruab nrab ntawm corundum thiab pob zeb diamond, lub zog txhua yam yog siab dua corundum, tuaj yeem siv los ua abrasive thiab lwm yam khoom siv. Kev lag luam silicon carbide tau ntse tsim nyob rau hauv 1891 thiab yog qhov ntxov tshaj plaws abrasive. Txawm hais tias ib qho me me ntawm silicon carbide muaj nyob rau hauv cov meteorites thiab cov pob zeb, tsis muaj cov pob zeb hauv av tau pom rau kev tsuas yog tam sim no.

Yog li dab tsi yog qhov tseem ceeb ntawm silicon carbide?

Ua ntej, abrasive - feem ntau vim hais tias silicon carbide muaj siab hardness, tshuaj stability thiab ib tug tej yam toughness, yog li ntawd silicon carbide yuav siv tau los tsim cemented abrasives, coated abrasives thiab dawb sib tsoo, thiaj li mus ua cov iav, ceramics, pob zeb, cam khwb cia hlau thiab ib co. non-ferrous hlau, cemented carbide, titanium alloy, high-speed steel cov cuab yeej thiab sib tsoo log.

Thib ob, cov ntaub ntawv refractory thiab corrosion resistant - feem ntau vim hais tias silicon carbide muaj lub siab melting point (decomposition), tshuaj inertia thiab thermal vibration kuj, yog li silicon carbide yuav siv tau rau kev sib tsoo cov cuab yeej, ceramic khoom raug rho tawm mus rau hauv lub kiln nrog lub los thiab saggar, zinc smelting industrial ntsug lub tog raj kheej distillation rauv nrog silicon carbide cib, aluminium electrolytic tank hauv ob sab phlu, crucible, me me ntawm cov khoom siv rauv thiab lwm yam khoom siv silicon carbide ceramic.
Thib peb, tshuaj lom neeg kev lag luam - vim hais tias silicon carbide tuaj yeem decomposed nyob rau hauv molten steel thiab reacts nrog oxygen thiab hlau oxides nyob rau hauv molten steel los tsim carbon monoxide thiab silicon-muaj slag. Yog li, nws tuaj yeem siv los ua tus neeg ua haujlwm huv rau smelting steel, uas yog, ua deoxidizer rau steelmaking thiab cam khwb cia hlau cov ntaub so ntswg txhim kho. Qhov no feem ntau siv tsawg-purity silicon carbide los txo cov nqi. Nws tseem tuaj yeem siv los ua cov khoom siv raw rau kev tsim cov silicon tetrachloride.

Hluav taws xob -- siv los ua cov khoom cua sov, cov khoom tsis sib xws thiab cov khoom siv hluav taws xob siab. Cov khoom siv cua sov xws li silicon carbon pas nrig (tsim rau txhua yam ntawm cov hluav taws xob ua haujlwm ntawm 1100 ~ 1500 degree), nonlinear kuj ntsiab lus, txhua yam ntawm xob laim ntes valve daim hlau.