Cov khoom siv sintered silicon carbide uas muaj cua sov yog cov carbide uas tsis yog hlau nrog silicon thiab carbon covalent bond, thiab nws qhov nyuaj yog qhov thib ob tsuas yog pob zeb diamond thiab boron carbide. Cov mis tshuaj yog SiC. Cov siv lead ua tsis muaj xim, xiav thiab dub thaum oxidized lossis muaj cov khoom tsis huv. Qhov deformation ntawm silicon carbide nrog cov qauv pob zeb diamond feem ntau hu ua emery. Qhov nyuaj ntawm emery yog ze rau pob zeb diamond, thermal stability zoo, ruaj khov rau hydroxy acid aqueous kua thiab concentrated sulfuric acid, thiab tsis ruaj khov rau cov kua qaub sib xyaw lossis phosphoric acid ntawm concentrated hydrogen acid thiab nitric acid. Cov alkalis uas yaj hauv huab cua hollow sib txawv. Nws yog muab faib ua cov khoom siv silicon carbide thiab cov khoom siv silicon carbide ntuj. Cov khoom siv silicon carbide ntuj, hu ua carbonite, feem ntau pom muaj nyob rau hauv kimberlite thiab volcanic amphibolite, tab sis nws cov nyiaj me me thiab tsis muaj txiaj ntsig khawb av.
Cov silicon carbide sintered uas muaj cua sov hauv kev lag luam yog sib xyaw ntawm -SiC thiab -SiC thiab muaj ob xim: dub thiab ntsuab. Cov silicon carbide ntshiab tsis muaj xim, muaj cov khoom tsis huv xws li dub, ntsuab, xiav, daj. Cov ciam teb hexagonal thiab cubic, cov siv lead ua yog phaj, cov kab sib xyaw. Cov iav ci, qhov ceev yog 3.17 ~ 3.47G / CM3, Morse hardness 9.2, lub tshuab microscope kuj tseem nyob ntawm 30380 ~ 33320MPa melting point: atmospheric 2050 pib sib txawv, rov qab atmospheric 2600 pib sib txawv. Cov coefficient elastic yog 466,480 MPa. Lub zog tensile yog 171.5MPa. Lub zog compressive yog 1029MPa. Cov coefficient nthuav dav yog (25 ~ 1000) 5.010 ~ 6 /. Lub thermal conductivity (20) yog 59w / (mk). Kev ruaj khov tshuaj lom neeg, rhaub hauv HCl, H2SO4, HF yuav tsis lwj.
Raws li kev siv sib txawv, atmospheric pressure sintered silicon carbide raug muab faib ua abrasive, refractory, deoxidizer, hluav taws xob silicon carbide thiab lwm yam. Cov ntsiab lus SiC ntawm abrasive silicon carbide yuav tsum tsis pub tsawg dua 98%. Refractory silicon carbide raug muab faib ua: (1) advanced refractory cov ntsiab lus dub silicon carbide, nws cov ntsiab lus SiC yog tib yam li kev sib tsoo silicon carbide. (2) Secondary refractory cov ntsiab lus dub silicon carbide, SiC cov ntsiab lus ntawm ntau dua 90%. (3) Cov ntsiab lus ntawm dub silicon carbide thiab SiC hauv cov refractories qis-qib tsis tsawg dua 83%. Cov ntsiab lus ntawm silicon carbide thiab SiC siv hauv deoxidizer feem ntau yuav tsum siab dua 90%. Txawm li cas los xij, carbon industrial graphitization cub tawg rwb thaiv tsev, silicon carbide cov ntsiab lus ntawm ntau dua 45% ntawm kev kho mob kuj tseem siv tau ua steelmaking deoxidizer. Silicon carbide rau deoxidizing tus neeg sawv cev muaj ob hom hmoov zoo thiab molding thaiv. Hmoov deoxidizer dub silicon carbide feem ntau muaj qhov loj me ntawm 4 ~ 0.5 hli thiab 0.5 ~ 0.1 hli.
Cov khoom siv hluav taws xob silicon carbide muaj ob pawg tseem ceeb
(1) Cov silicon carbide ntsuab siv rau cov khoom siv cua sov hluav taws xob zoo ib yam li cov silicon carbide ntsuab siv rau kev sib tsoo.
(2) Silicon carbide rau arrester muaj cov kev cai tshwj xeeb ntawm kev ua haujlwm hluav taws xob, uas txawv ntawm cov dub silicon carbide rau kev sib tsoo cov ntaub ntawv refractory.
Kev siv cov atmospheric pressure sintered silicon carbide
Cov khoom siv sintered silicon carbide uas muaj cua siab muaj cov haujlwm tshwj xeeb xws li kev tiv taus kub siab, kev tiv taus hnav, kev tiv taus kub, kev tiv taus hluav taws, kev tiv taus hluav taws xob, kev ua hluav taws xob thiab thermal conductivity zoo heev, thiab lwm yam, thiab tau siv dav hauv ntau lub chaw haujlwm ntawm kev lag luam hauv tebchaws. Hauv Suav teb, silicon carbide ntsuab feem ntau yog siv ua abrasive. Silicon carbide dub yog siv los ua cov pob zeb sib tsoo, uas feem ntau siv los txiav thiab sib tsoo cov ntaub ntawv uas muaj lub zog tensile qis, xws li iav, ceramics, pob zeb, refractories, thiab tseem rau kev sib tsoo cov hlau cam khwb cia thiab cov ntaub ntawv hlau tsis yog ferrous. Kev sib tsoo ua los ntawm silicon carbide ntsuab feem ntau yog siv rau kev sib tsoo ntawm cemented carbide, titanium alloy, optical iav, thiab tseem rau kev sib tsoo ntawm lub tog raj kheej liner thiab cov cuab yeej hlau ceev ceev. Cubic silicon carbide abrasives tsuas yog siv rau kev sib tsoo ultra-precision ntawm cov bearings me me. Kev tiv taus hnav ntawm turbine impellers tuaj yeem txhim kho zoo heev los ntawm kev siv SIC hmoov rau lawv los ntawm electroplating. Siv lub zog kho tshuab los thawb lub cubic SiC200 zeb thiab W28 micro-hmoov rau phab ntsa lub tog raj kheej ntawm lub cav combustion sab hauv, lub neej lub tog raj kheej tuaj yeem ntau dua ob npaug.
Lub sijhawm tshaj tawm: Lub Rau Hli-16-2023