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Dab tsi yog Silicon Nitride (Si3N4) siv rau? siv silicon nitride

Nov 14, 2025

Tso lus

 

Dab tsi yog Silicon Nitride (Si3N4) siv rau?

Kev paub tsab xov xwm · Hloov tshiab 2026-08-11 · Cov khoom muaj nqis yog cov ntaub ntawv zoo ib yam; paub meej nrog cov ntaub ntawv xa khoom xa tuaj

Ntsiab Cai

  • Silicon nitride (Si3N4) yog ib qho kev ua haujlwm siab -kev ua haujlwm engineering ceramic combining siab zog, hardness, hnav tsis kam, thermal- shock resistance thiab hluav taws xob rwb thaiv tsev.
  • Ob yam khoom sib txawv qhia lub npe: metallurgical- qib silicon nitride (ib qho khoom siv steelmaking) thiab silicon nitride advanced ceramics (cov khoom siv); kab lus no npog cov ntawv thov ceramic.
  • Kev siv yam: qhov cub thiab qhov cub, txuas ntxiv -casting rolls, thermocouple tiv thaiv raj, turbocharger rotors, bearings, seals thiab hluav taws xob insulators.
  • Si3N4 Cheebtsam yog engineered rau daim ntawv thov; ib txwm qhia geometry, lub luag haujlwm kub, huab cua thiab kam rau ua thaum xaj.

1. Silicon Nitride: Ceramic, Tsis yog Alloy

Silicon nitride (Si3N4, CAS 12033-89-5) yog covalent ceramic uas tsim los ntawm kev sib txuas los yog sintering ntawm silicon hmoov hauv nitrogen. Nws yuav tsum tsis txhob tsis meej pem nrog metallurgical-qib silicon nitride siv hauv steelmaking, uas yog nitrogen-alloying additive; Kab lus no piav qhia txog silicon nitride ua cov khoom siv ceramic siab heev rau cov khoom siv engineering. Nws ua ke ntawm txhua yam muaj zog, hardness, tsis tshua muaj thermal expansion thiab tiv thaiv thermal shock ua rau nws nyiam cov khoom siv hlau, alumina lossis silicon carbide hnav sai heev.

2. Yam khoom

Khoom Yam nqi
Qhov ntom txog 3.2 g / cm³
Vickers hardness txog 1,400–1,800 HV
Flexural zog ntau pua MPa (qib nyob ntawm)
Fracture toughness siab tshaj feem ntau technical ceramics (qib nyob ntawm)
Max kev pab kub tshaj 1,000℃hauv oxidising cua; siab dua nyob rau hauv inert / txo kev pab cuam
Thermal expansion qis, muab thermal zoo - poob siab tsis kam
Hluav taws xob coj cwj pwm hluav taws xob insulator

Cov nqi yog cov ntaub ntawv zoo ib yam; cov ntaub ntawv tseeb nyob ntawm qib thiab sintering txoj kev thiab yuav tsum tau lees paub nrog tus neeg muag khoom cov ntaub ntawv.

3. High-Tub thiab Metallurgical Plant Applications

  • Qhov cub thiab kiln Cheebtsam:hauv ob sab phlu, rollers thiab cov yam ntxwv qhov chaw uas ruaj khov ntawm qhov kub thiab txias thiab tsis kam mus rau molten hlau los yog oxides yuav tsum tau.
  • Nruam casting:ceramic rollers thiab cov lus qhia raug rau cov hlau kub thiab thermal cycling.
  • Thermocouple tiv thaiv tubes:inert, siab -kub-resistant sheaths rau ntsuas kub hauv cov hlau melting thiab casting.
  • Molten-hlau tuav:cov khoom uas nyob ruaj khov nyob rau hauv kev sib cuag nrog molten non{0}}ferrous hlau thiab slags.

4. Automotive daim ntawv thov

Nyob rau hauv lub cav, silicon nitride yog siv nyob qhov twg lub teeb yuag thiab tshav kub kuj them tawm: glow plugs, turbocharger rotors thiab tso li qub. Hloov cov khoom hlau nrog Si3N4 txo qhov kev sib hloov loj thiab inertia, txhawb cov lus teb sai dua thiab qis dua emissions, thaum lub ceramic tiv taus qhov kub thiab txias.

5. Kev siv dav dav hauv kev lag luam

  • Bearings thiab seals:hybrid thiab puv -ceramic bearings siv hardness, hnav tsis kam thiab corrosion kuj nyob rau hauv xav tau ib puag ncig.
  • Cov cuab yeej txiav:inserts thiab tooling rau siab -machining ceev ntawm cam khwb cia hlau thiab hard alloys.
  • Hluav taws xob rwb thaiv tsev:insulators thiab substrates hauv microelectronic thiab cov khoom siv fais fab, sib txuas cov rwb thaiv tsev nrog cov neeg kho tshuab robustness.

Cov lus nug nquag

Q1.Puas yog silicon nitride nyuaj dua li cov hlau?
Hauv cov ntsiab lus hardness, yog: silicon nitride ceramics yog qhov nyuaj tshaj li cov qauv hlau, uas yog vim li cas lawv siv rau hnav qhov chaw thiab cov cuab yeej txiav. Cov nqi hardness yog qib - nyob ntawm.

Q2. Dab tsi yog qhov txawv ntawm metallurgical silicon nitride thiab ceramic silicon nitride?
Metallurgical-qib silicon nitride yog siv hauv steelmaking raws li nitrogen alloying additive (hmoov los yog granule); ceramic silicon nitride yog sintered rau hauv engineering Cheebtsam. Paub meej tias yam khoom koj xav tau thaum nug.

Q3. Dab tsi kub tuaj yeem tiv taus silicon nitride?
Kev pabcuam txuas ntxiv siab dua 1,000℃yog qhov muaj nyob rau hauv oxidising atmospheres, nrog kev txwv ntau dua hauv inert lossis txo cov mob; qhov txwv qhov tseeb nyob ntawm qib thiab daim ntawv thov.

 

 

Peb Daim Ntawv Pov Thawj

 

 

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