Cov txheej txheem Sintering ntawm cov pob zeb diamond ntu

1. OvertView ntawm Sintering

Sintering yog ib qho ntawm cov txheej txheem yooj yim tshaj plaws hauv cov hmoov metallurgy cov txheej txheem, thiab nws kuj yog cov txheej txheem loj. Nws ua lub luag haujlwm txiav txim siab hauv kev ua haujlwm ntawm cov khoom kawg. Sintering yog "Gateway" ntawm pob zeb diamond hniav ntau lawm.

 

Cov txheej txheem Sintering yog cov txheej txheem ntawm lub cev thiab cov tshuaj lom neeg zoo li cov khoom siv sib txawv, ua rau cov khoom lag luam muaj zog, ua kom cov khoom muaj zog thiab muaj lub zog tawv thiab muaj zog.

 

Sintering cov txheej txheem tsuas yog hais txog Sintering System, thiab cov nkhaus yog kos raws li kev sib raug zoo ntawm kev sib raug zoo thiab sijhawm. Yog li ntawd, cov sintering kub yuav tsum tau txiav txim siab ua ntej raws li cov hniav sib xyaw ua ke thiab cov kev qhia kub tom qab mus cuag cov sintering kub yuav tsum tau txiav txim siab.

 

• 1) Kev Txiav Txim ntawm Sinining Kub

For a certain saw blade product, since its matrix composition has been determined, its sintering temperature is a fixed temperature range. This range is generally specified at the optimal temperature sintering point plus or minus 10°C, and the sintering temperature is generally about 2/3 of the melting point of the main component, that is, Tsintering>2\/1tmelting. Qhov ntsuas kub tiag yog txiav txim siab los ntawm kev sim Sintering Test Thaiv. Thawj pab pawg ntawm cov ntawv xeem tau txiav txim siab raws li qhov ntsuas kub saum toj no. Tom qab tau sim Sintering, cov xim, cov xim, crystallization, thiab lwm yam ntawm cov kev ntsuas cov blocks tau pom tias lawv tau raug ntau dua lossis raug hlawv. Tom qab ntawd sintering kub ntawm ob pab pawg ntawm cov pawg xeem ob thiab thib peb thiab thib plaub ntawm cov pawg sib tw kom txog thaum tus neeg tsim nyog tau txais.

 

• 2) Sintering Sijhawm

Sintering lub sijhawm thiab Sinining kub yog ib khub ntawm cov ntsiab lus ntawm cov saws, tab sis yog tias cov khoom siv tsis raug, thiab txawm tias cov khoom sib cais yuav tshwm sim, cuam tshuam rau cov khoom lag luam zoo. Thaum cov sintering kub yog tsawg, lub sijhawm rwb thaiv tsev ntawm sintering yuav tsum tau txuas ntxiv, txwv tsis pub cov khoom yuav nyob hauv qab. Lub sintering kub sib txawv tsis tuaj yeem loj dhau, feem ntau nyob ib puag ncig 20oC.

 

2. Theoretical tsom xam ntawm Sintering cov txheej txheem

Tom qab matrix hmoov yog sintered, lub zog ntawm cov sintered lub cev nce. Ua ntej, lub zog sib txuas ntawm lub hmoov ua kom nce. Thaum lub sij hawm sintering, vim qhov kub thiab txias, tso cai rau cov atoms hauv cov hmoov av nkag mus rau hauv qhov chaw sib tiv toj. Ntxiv mus, raws li cov khoom sib khi saum npoo nthuav, lub zog ntawm cov sintered lub cev kuj nce. Cov khoom sib txuas saum npoo nthuav los ua ib qho kev sib txuas, yog li cov thawj particle interface, thiab raws li cov nplej sib txuas tau mus rau sab hauv ntawm cov nplej, ua rau muaj kev loj hlob ntawm cov nplej.

 

Qhov nce nyob rau hauv lub zog ntawm cov sintered lub cev kuj tseem pom nyob rau hauv kev txo ntawm kev txo ntawm cov ntim pores thiab tag nrho cov nyiaj pores, nrog rau qhov hloov pauv ntawm cov duab ntawm cov hws. Raws li cov sintering caj dab loj tuaj, lub pores uas tau ua rau thaum xub thawj ntawm cov me nyuam maj mam ntsws mus rau hauv qhov chaw kaw thiab tom qab ntawd dhau los ua ib puag ncig. Qhov luaj li cas thiab tus naj npawb ntawm cov hws kuj tseem hloov pauv, uas yog, tus naj npawb ntawm pores txo qis, thaum nruab nrab pore loj nce ntxiv.

 

Qhov tsim ntawm cov particle tsev sab nrauv feem ntau tsis ua rau lub zog ntawm cov sintered lub cev. Yog li ntawd, descification tsis kos pib ntawm cov txheej txheem Sintering, thiab tsuas yog nce ntxiv hauv lub cev muaj zog yog ib qho pom tseeb ntawm Sintering. Nrog rau kev loj hlob ntawm sintering caj dab, txo ntawm tag nrho cov pore ntau heev, thiab qhov tsis txaus ntawm qhov kev ncua deb ntawm cov txheej txheem densification ntawm cov sintered lub cev tiag tiag pib. Raws li tau hais los saum toj no, ntxiv rau kev loj hlob ntawm Sinining caj dab thaum lub Sintering cov txheej txheem, qhov kev cog lus tuaj yeem ua rau muaj txiaj ntsig thiab tsis txaus ntseeg; Thaj av thaj tsam yuav txo qis; Lub zog tuaj yeem nce, thiab kev coj ua yuav nce ntxiv. Cov teeb tsa no muab cov tau hais txog qhov sintering txheej txheem. Feem ntau, cov txheej txheem SINNINTING yog nrog rau qhov tsawg ntawm cov sintered lub cev.

 

Nws qhov ntsuas tsis tau yog qhov tseeb φ tuaj yeem qhia raws li:

Φ=(ρs–ρg)/(ρt-ρg)

qhov twg ρs -- sinteeded lub cev ntom ntom;

ρ ρ {0}} theoretical ceev;

ρ ρ --} compacted ntom.

 

Daim duab hauv qab no qhia cov kev hloov pauv ntawm qee qhov tsis muaj thaum muaj ob qho kub (T2), cuam tshuam txog lub sijhawm thiab ntsuas kub ntawm Sintering txheej txheem.

 

 

Tus txheej txheem ayothermal sintering ntawm hmoov tuaj yeem sib faib ua peb theem nrog cov kab ke tsis meej (schematic daim duab (schematic daim duab dhos raws li hauv qab no).

 

(1) Theem pib - thawj theem ntawm Sintering, lossis theem kev sib raug zoo. Tus thawj cov ntsiab lus sib tiv tauj lossis chaw sib tiv tauj ntawm cov ntsiab yog hloov mus rau cov qoob loo graving, uas yog tsim los ntawm atomic tsiv teb tsaws chaw xws li nucleation thiab kev loj hlob. Cov theem no feem ntau yog cuam tshuam nrog cov hlau rov qab, viav vias ntawm adsorbed roj thiab dej, thiab decomposition thiab tshem tawm ntawm tus neeg sawv cev hauv cov neeg sawv cev hauv kev sib txuas.

 

(2) Nruab Nrab Theem - Sinining Cow kev loj hlob theem. Qhov loj-teev tsiv teb tsaws ntawm atom rau cov particle tsev saum npoo av ua rau lub caj dab txuas ntxiv kom txo qis, thiab txuas ntxiv mus rau daim ntawv. Nyob rau tib lub sijhawm, vim tias cov nyom sib nraus txav hla lub pores, thiab qhov hws ploj hauv cov coob uas cov qoob loo ciam av. Nce ntom ntom ntom thiab lub zog yog cov yam ntxwv tseem ceeb ntawm theem no.

 

(3) Thaum kawg theem - kaw pore spheroidization thiab shrinkage theem. Feem ntau cov hws sib cais tau cais tawm tag nrho, tus naj npawb ntawm cov ntxig uas kaw tau zoo heev, thiab cov duab pore zoo li yuav ua kom huv thiab txuas ntxiv mus. Nyob rau hauv theem no, tag nrho sintered lub cev tseem tuaj yeem shrip maj mam, tab sis qhov no tau ua tiav los ntawm kev ploj ntawm cov pores me me thiab txo tus naj npawb ntawm cov pores. Txawm li cas los xij, tseem muaj tus naj npawb me me ntawm cov seem cais cais cov pores me me uas tsis tuaj yeem tshem tawm.

 

Quanzhou Huice Cov cuab yeej muaj ntau xyoo ntawm kev paub hauv kev tsim lub pob zeb diamond ntu. Yog tias koj xav tau txais cov kev paub thiab cov ntaub ntawv ntxiv, thov hu rau peb.