Silicon nitride - cov khoom ntawm lub neej yav tom ntej nrog cov khoom tshwj xeeb

2024 Tus sau: Angel Austin | [email protected]. Kawg hloov kho: 2024-01-02 17:48

Tam sim no, cov ntaub ntawv ceramic tau nce ntxiv hauv ferrous thiab non-ferrous metallurgy, iav thiab refractory industries. Lawv muaj cov khoom tshwj xeeb uas tso cai rau koj los txhim kho ntau yam kev tsim khoom. Cov khoom siv zoo tshaj plaws ceramic yog silicon nitride. Qhov no yog cov khoom ntawm lub neej yav tom ntej, ua tsaug rau ntau yam kev tsim khoom siv thev naus laus zis tau rov ua dua tshiab. Piv txwv li, xws li kev lag luam kub mining thiab txhua yam kev ua cov nroj tsuag.

Cov tshuaj no yog dab tsi?

Silicon nitride yog cov khoom siv ceramic tshwj xeeb uas pom nws daim ntawv thov hauv ntau qhov kev lag luam. Nws belongs rau pab pawg neeg ntawm non-oxide ceramics vim nws tsis muaj oxygen atoms.

Silicon nitride formula: Si₃N_4.

qauv

Microstructure Si₃N_{4 yog cov microrods uas tsim cov pob zeb cylindrical. Cov cuab yeej no tau dhau los ua qhov tseem ceeb hauv kev ua haujlwm ntawm ntau hom cam khwb cia hlau, tshwj xeeb tshaj yog cov uas muaj cov khoom siv ceramic. Thaum siv cov hlau sib txawv raws li cov ntaub ntawv txiav, qhov ceev tsis yog ceev raws li qhov yuav tsum tau ua, yog li nws yuav tsum tau siv ntau yam ntawm cov kua txiav. Vim yog cov qauv zoo kawg nkaus ntawm silicon nitride, nws siv rau kev txiav cam khwb cia hlau ua rau qhov tseeb tias nws muaj peev xwm ua tiav qhov siab tshaj plaws yam tsis tas yuav tsum muaj lubricating kua. Vim nws qhov tshwj xeeb muaj pes tsawg leeg, cov khoom siv no muaj lub zog muaj zog, uas txhais tau hais tias cov khoom muaj kev tiv thaiv siab heev.}

Tau txais

Muaj ntau txoj hauv kev kom tau txais qhov sib xyaw no. Ib tug ntawm lawv yog cov tshuaj los nag, uas yog nqa tawm ntawm qhov kub ntawm 700 mus rau 900 ° C. Thaum siv txoj kev no, ib qho tshuaj tau txais hauv daim ntawv amorphous, uas yog dielectric. Nyob rau hauv cov ntaub ntawv no, cov ntsiab lus ntawm hydrogen nyob rau hauv cov ntaub ntawv no muaj peev xwm mus txog 8%. Hauv qhov no, nitrogen thiab silicon atoms tuaj yeem tsim hydrogen bonds nrog hydrogen muaj nyob rau hauv amorphous precipitate. Muaj kev vam khom ntawm cov ntsiab lus ntawm hydrogen atoms ntawm qhov kub ntawm qhov kev tso tawm, nrog rau qhov sib piv ntawm cov khoom pib hauv cov roj sib tov.

Cov ntsiab lus siab tshaj plaws ntawm cov khoom tshwm sim yog tias silicon nitride tso rau ntawm qhov kub thiab txias ntawm qhov siab ntawm ammonia hauv cov roj sib tov. Yog hais tias tus txheej txheem yog nqa tawm nyob rau hauv ib tug me meQhov sib piv ntawm ammonia rau dichlorosilane, cov khoom siv yuav suav nrog ntau txaus ntawm silicon hauv nws cov muaj pes tsawg leeg, uas ua rau tsim cov khoom tsis txaus dielectric. Resistance to hluav taws xob Si₃N_{4 kuj yog nyob ntawm qhov kub thiab txias raws li nws tsim.}

Silicon nitride ntau lawm yog txheej txheem nyuaj uas muaj ntau yam xwm txheej yuav tsum tau txiav txim siab kom cov khoom ua tau raws li qhov yuav tsum tau ua. Muab cov chaw tseem ceeb uas nws pom nws daim ntawv thov, nws yog ib qho tsim nyog yuav tsum muaj lub luag haujlwm ua raws li cov xwm txheej rau kev tso nyiaj.

Khoom ntawm silicon nitride

Cov khoom no yog ib yam khoom uas muaj lub cev thiab lub cev-tshuaj lom neeg.

Kuv muaj ib qho tseem ceeb tshaj plaws yog tias cov tshuaj no muaj lub zog qis dua thiab muaj peev xwm ntau tshaj, uas ua rau muaj peev xwm siv cov khoom si silicon li pob.

Cov khoom siv no yog cov cua sov tiv taus. Nws tuaj yeem siv tau ntawm 1300 ° C hauv qhov chaw oxidizing thiab ntawm 1600 ° C hauv qhov nruab nrab. Cov khoom no tseem ceeb heev rau kev siv ntau yam kev lag luam xws li cov txheej txheem vuam.

Daim ntawv thov

Vim nws cov yam ntxwv tshwj xeeb, silicon nitride tau siv dav hauv ntau qhov chaw ntawm kev lag luam. Cov khoom siv no yog qhov tseem ceeb tshaj plaws rau kev lag luam hlau, xws liYuav ua li cas, siv nws li cov cuab yeej txiav, koj tuaj yeem ua kom cov txheej txheem ceev, nrog rau tsis kam siv cov coolants thiab lubricants.

Dhau li ntawm qhov no, vim muaj kev kub ntxhov hauv ntau qhov chaw, Si₃N_{4 yog siv rau hauv cov khoom siv vuam ntau yam. Vim muaj kev sib xyaw ua ke ntawm tribological khoom, silicon nitride yog siv los ua cov pob rau ntau hom bearings.}