Plaub theem pib ntawm tungsten carbide sintering txheej txheem

Tungsten carbide, tseem hu ua cemented carbide, muaj cov yam ntxwv ntawm siab hardness, siab zog, zoo hnav tsis kam thiab toughness, zoo heev kub tsis kam, thiab corrosion kuj. Thiab nws feem ntau yog siv los ua cov cuab yeej drilling, cov cuab yeej mining, cov cuab yeej txiav, cov khoom hnav-tiv taus, hlau tuag, precision bearings, nozzles, thiab lwm yam.

Sintering yog cov txheej txheem tseem ceeb rau kev ua cov khoom tungsten carbide. Muaj plaub theem pib ntawm tungsten carbide sintering txheej txheem.

1. Pre-sintering theem (Kev tshem tawm ntawm kev tsim tus neeg sawv cev thiab pre-sintering theem)

Kev tshem tawm ntawm tus neeg sawv cev sib sau: Nrog rau qhov nce ntawm qhov kub thiab txias ntawm sintering, tus neeg sawv cev tsim maj mam decomposes los yog vaporizes, yog li tshem tawm ntawm lub hauv paus sintered. Nyob rau tib lub sijhawm, tus neeg sawv cev tsim yuav ua rau cov pa roj carbon ntau ntxiv rau lub hauv paus sintered ntau dua los yog tsawg dua, thiab cov pa roj carbon ntau yuav sib txawv nrog rau hom thiab qhov ntau ntawm tus neeg sawv cev tsim thiab cov txheej txheem sintering.

Cov oxides nyob rau saum npoo ntawm cov hmoov yog txo: ntawm qhov kub thiab txias, hydrogen tuaj yeem txo cov oxides ntawm cobalt thiab tungsten. Yog tias tus neeg ua haujlwm raug tshem tawm hauv lub tshuab nqus tsev thiab sintered, cov tshuaj tiv thaiv carbon-oxygen yuav tsis muaj zog heev. Raws li kev sib cuag kev ntxhov siab ntawm cov hmoov hmoov yog maj mam tshem tawm, cov hmoov hlau sib txuas yuav pib rov qab thiab rov ua dua tshiab, qhov saum npoo yuav pib diffuse, thiab lub zog compact yuav nce raws li.

Nyob rau theem no, qhov kub thiab txias yog tsawg dua 800 ℃

2. Khoom-theem sintering theem (800 ℃ — eutectic kub)

800 ~ 1350C ° tungsten carbide hmoov nplej loj hlob loj thiab ua ke nrog cobalt hmoov los ua eutectic.

Ntawm qhov kub thiab txias ua ntej cov tsos ntawm cov kua theem, cov khoom-theem cov tshuaj tiv thaiv thiab diffusion yog intensified, cov yas ntws yog txhim khu kev qha, thiab lub cev sintered shrinks ho.

3. Ua kua theem sintering theem (eutectic kub - sintering kub)

Nyob rau ntawm 1400 ~ 1480C ° cov binder hmoov yuav yaj mus rau hauv cov kua. Thaum cov kua theem tshwm nyob rau hauv lub hauv paus sintered, lub shrinkage yog ua tiav sai sai, ua raws li crystallographic transformation los tsim cov qauv thiab cov qauv ntawm cov alloy.

4. Cua txias theem (Sintering kub - chav tsev kub)

Nyob rau theem no, cov qauv thiab theem muaj pes tsawg leeg ntawm tungsten carbide tau hloov nrog cov cua txias sib txawv. Cov yam ntxwv no tuaj yeem siv los ua kom sov-trench tungsten carbide los txhim kho nws lub cev thiab cov khoom siv kho tshuab.

Yog tias koj txaus siab rau cov khoom lag luam tungsten carbide thiab xav paub ntau ntxiv thiab cov ntsiab lus, koj tuaj yeem tiv tauj peb hauv xov tooj lossis xa ntawv ntawm sab laug, lossis xa US MAIL hauv qab ntawm nplooj ntawv.