Dab tsi yog cov ntawv thov ntawm Si3N4 Ferro Silicon Nitride Hmoov hauv Metallurgy?

Silicon Nitride (Sin₄) Hmoov, Nrog Si₃n₄ raws li nws cov theem tseem ceeb, feem ntau muaj 55% -65% -25% n, nrog tag nrho cov impurities (, nrog tag nrho cov impurities (al, s, p) tsawg dua lossis sib npaug rau 3%. Nws cov yam ntxwv ntawm cov ntawv thov sib pab sib pab hauv cov duab metallurgical:

 Muaj zog thermodynamic stability:Si₃n₄ muaj lub ntsiab lus melting ntawm kwv yees li ntawm 1900℃thiab tsis decompose hauv Molten Steel / Hlau hauv qab 1600 degree, ua rau muaj kev tawm tsam me thiab tuaj yeem ua rau muaj kev tawm tsam me thiab tuaj yeem ua rau muaj kev tawm tsam me me thiab tuaj yeem ua rau muaj kev tawm tsam me thiab tuaj yeem ua rau muaj kev tawm tsam me me thiab tuaj yeem ua rau muaj kev tawm tsam me thiab tuaj yeem ua rau muaj kev tawm tsam me me thiab tuaj yeem ua rau muaj kev tawm tsam me thiab tuaj yeem ua rau muaj kev tawm tsam me thiab tuaj yeem ua rau muaj kev tawm tsam me thiab tuaj yeem ua rau muaj kev tawm tsam me thiab tuaj yeem ua rau muaj kev tawm tsam me me thiab tuaj yeem ua rau muaj kev tawm tsam me thiab tuaj yeem ua rau muaj kev phom sij.

 Tsim Risticity:Cov tshuaj tiv thaiv dawb lub zog nruab nrab ntawm si thiab o (ΔG₂₀₀₀K=-477 kj / mol / mol / mol / ees muaj deoxidation tsis muaj teeb meem.

 Zoo heev particle cov yam ntxwv:Industrial - Txoj Haujlwm Qib Qib Muaj Qhov Loj Li 100-300-150, thiab cov khoom siv tshwj xeeb uas tsis yooj yim.

(1) Kev khib nyiab steeliding: Txhim kho lub purity thiab ruaj khov ntawm molten hlau

Silicon nitride hmoov, raws li ib tug heev zoopuas deoxidizer, muaj qhov tseem ceeb tshaj qhov qubferrosiliconThiab txhuas deoxidizers:

Deagidation mechanism:

Si₃n₄ reacts nrog o hauv Molten Steel los tsim cov siio₂ thiab n₂. Sio₂ muaj qhov ntom ntom ntawm 2.65 g / cmÃ, deb dua li Molten Hlau (7.8 G /M³), ua rau nws yooj yim ntab thiab tshem tawm nrog slag. Thaum n₂ escapes nyob rau hauv daim ntawv ntawm npuas, nws tuaj yeem nqa qee qhov kev suav me me, ntxiv ua kom huv cov hlau molten.

Cov xwm txheej haum:

Muaj feem xyuam rau tsawg -} ecoy high- Lub zog steel, cov kabmob hlau, thiab lwm yam cov hlau ua kom muaj zog. Nws tuaj yeem txo qhov tsis txaus sab hauv thiab kev cuam tshuam hauv hlau, thiab txhim kho tensile lub zog thiab qaug zog lub neej.

(2) Kev hloov kho kom haum: ua kom zoo rau cov khoom siv me me ntawm cov hlau

Yog thiab n ua hauj lwm synergistically kom ua tiav qhov sib npaug ntawm "ntxiv dag zog thiab ua kom nruj" hauv steel:

Muaj zog zuj zus tshuab:

SI dispolves rau hauv cov hlau ntoo hlau, ua rau cov tawv nqaij tawv, tabkaum kev tshem tawm lub zog, thiab kev txhim kho lub zog thiab tawv ntawm cov hlau; N Cov khoom noj kom zoo thiab cov nitrides (xws li NBN thiab VN) nrog cov hlau xws li NB thiab V nyob rau hauv cov hlau, kev ua ib qho khoom siv tsis taus zog, thaum ua kom muaj cov nplej ua kom zoo nkauj;

Cov Ntaub Ntawv Txhim Kho Cov Ntaub Ntawv:

Thaum ua cov siab siab - Lub zog alloy Hlau, ntxiv 0.4% -0.8%Silicon Nitride Ferro Hmoovnce ntxiv cov txiaj ntsig ib lub zog ntawm cov hlau los ntawm 15% -20%, lub zog tensile los ntawm 10%, thiab lub elongation tseem nyob saum 18%, ntsuas lub zog thiab cov yas ua kom muaj zog;

(3) Cov teb casting: Txhim kho cov khoom ua tau zoo thiab muaj peev xwm

Silicon Nitride Hlau Hmoov muaj ob qho tib si inoculation thiab flowculation hloov kho cov hlau, zas cam khwb cia hlau, zas cam khwb cia hlau, thiab precision casting:

Optimized Flowility:

Txo cov npoo nro ntawm cov hlau tsis sib xws, txo cov kab mob viscosity 15% -20%, txhim kho cov hlau thiab txo qhov tsis txaus ntseeg li "thiab" txias kaw ";

Lis Kev Txhim Kho:

Cov hmoov av ua raws li heterogeneous nucleative nucleatation ntawm cov duab los ntawm graphite, txhawb nqa cov duab los ntawm cov duab los ntawm kev ua haujlwm los ntawm 25% -30%, thiab txhim kho cov khoom tiv thaiv;

(4) Tshwj Xeeb Hlau Ntau Lawm: Ntsib cov kev xav tau ntawm high-} kawg scenarios

Hauv kev tsim cov hlau tshwj xeeb xws li high - kub alloys thiab stainless silicon nitride hmoov ua lub luag haujlwm tshwj xeeb:

High - kub alloys:

Thaum siv rau hauv kev tsim cov khoom lag luam siab - kub alloys ntawm {%, thiab muaj peev xwm tiv thaiv oxidation ntau tshaj li 25%, thiab muaj peev xwm tiv thaiv kev kub ntxhov ntau dua 25%, thiab muaj peev xwm tiv thaiv kev loj hlob ntawm 30%, thiab muaj peev xwm tiv thaiv kev loj hlob ntawm 30%, thiab muaj peev xwm tiv thaiv kev loj hlob ntawm 30%, thiab muaj peev xwm tiv thaiv kev loj hlob ntawm 30%, thiab muaj peev xwm tiv thaiv kev loj hlob ntawm 30%, thiab muaj peev xwm tiv thaiv kev loj hlob ntawm 30%, thiab muaj peev xwm tiv thaiv kev kub ntxhov ntau dua 25%, thiab muaj peev xwm tiv thaiv kev loj hlob ntawm 30%, thiab muaj peev xwm tiv thaiv kev loj hlob ntawm 30%, thiab muaj peev xwm tiv thaiv kev loj hlob ntawm 30%, thiab muaj peev xwm tiv thaiv kev loj hlob ntawm 30%, thiab muaj peev xwm tiv thaiv kev kub ntxhov ntau dua 25%, thiab muaj peev xwm tiv thaiv kev loj heev thiab muaj huab cua phem;

Tus Hlau Stainless:

Ntxiv 0.3% - 0.5% hmoov tuaj yeem ua kom cov nplej uas tsis zoo, ua kom cov ntsev tsis zoo, ua kom muaj zog ua kom muaj zog los ntawm 200h. Txuas mus rau ntau tshaj li 350 teev, tsim nyog rau cov chaw muaj kev tiv thaiv kom haum xws li cov tshuaj chemical thiab cov txiv neej txua;

Lwm Cov Hlau Tshwj Xeeb:

Hauv Tool Steel ntau lawm, nws tuaj yeem txhim kho lub hardness thiab hnav tsis kam ntawm cov hlau; Hauv qhov qis - kub steel ntau lawm, nws txo cov hloov ntsuas kub los ntawm cov hlau ua kom zoo ntawm -60 degree.

(1) Ntxiv tus nqi tswj

Steelmaking deoxidation:

0.3% -0.6% (steel loj), muaj ntau dhau ntxiv tuaj yeem ua rau muaj cov hlau nyob hauv cov hlau (tshaj 0.015%), ua rau "nitrogen embrittlement";

Casting inoculation:

0.2% -0.5% (Molten hlau loj), ua rau ntau dhau yuav ua rau cov nrom heev, cuam tshuam kev ua haujlwm;

Tshwj xeeb steel aloying:

0.4% -0.8% (Molten Steel loj), yuav tsum tau hloov kho kom haum raws li cov hom phiaj muaj pes tsawg leeg ntawm qib.

(2) Sijhawm thiab Txuj Kev Ntxiv

Steelmaking:

Ntxiv thaum tom qab theem ntawm cov theem ntawm cov cub hluav taws xob kev ua kom zoo nkauj (hlau kub 1500-1600 degree) kom ntseeg tau tias cov hmoov tsis zoo thiab tsis txhob muaj agglomeration;

Nrum:

Ntxiv 1-2 feeb ua ntej tapping molten hlau, lossis ntxiv thaum lub sij hawm lub pouring txheej txheem los txhim kho cov nyhuv inoculation.

(3) Xaiv cov khoom

Yuav Tsum Purity:

High-purity FeSi3N4 powder (Si₃N₄ content>=90%, total impurities<=1%) is used for high-end steel grades;

Xaiv loj:

100-200 Mesh hmoov rau qhov txawv statmaking / casting, 200-300 mesh hmoov hmoov zoo rau precision kev coj ua.