1.Lub luag haujlwm ntawm txhua lub hauv paus ntawm pob zeb diamond saw hniav matrix yog dab tsi?
Lub luag hauj lwm ntawm tooj liab: tooj liab thiab tooj liab raws li alloys yog cov khoom siv feem ntau siv hauv cov hlau khi pob zeb diamond cov cuab yeej, nrog electrolytic tooj liab hmoov yog feem ntau siv.Cov tooj liab thiab tooj liab raws li cov alloys tau dav siv vim tooj liab raws li cov ntaub ntawv muaj txiaj ntsig zoo: qis sintering kub, zoo formability thiab sinterability, thiab miscibility nrog lwm yam.Txawm hais tias tooj liab tsis ntub cov pob zeb diamond, qee cov ntsiab lus thiab tooj liab alloys tuaj yeem txhim kho lawv cov wettability ntawm pob zeb diamond.Ib qho ntawm cov ntsiab lus xws li Cr, Ti, W, V, Fe uas tsim tooj liab thiab carbides tuaj yeem siv los ua tooj liab alloys, uas tuaj yeem txo qis lub kaum sab xis ntawm tooj liab alloys ntawm pob zeb diamond.Solubility ntawm tooj liab hauv hlau tsis siab.Yog tias muaj tooj liab ntau dhau hauv cov hlau, nws txo qis cov cua sov ua haujlwm thiab ua rau cov khoom tawg.Tooj liab tuaj yeem tsim ntau yam kev daws teeb meem nrog nickel, cobalt, manganese, tin, thiab zinc, ntxiv dag zog rau cov hlau matrix.
Kev ua haujlwm ntawm tin: Tin yog ib yam khoom uas txo qhov nro ntawm cov kua alloys thiab muaj cov nyhuv ntawm kev txo qis lub kaum sab xis ntawm cov kua alloy ntawm cov pob zeb diamond.Nws yog ib qho tseem ceeb uas txhim kho cov ntub dej ntawm cov hlau sib txuas ntawm cov pob zeb diamond, txo qhov melting point ntawm alloys, thiab txhim kho formability ntawm nias.Yog li Sn tau siv dav hauv cov nplaum, tab sis nws txoj kev siv yog txwv vim nws loj expansion coefficient.
Lub luag haujlwm ntawm zinc: Hauv cov cuab yeej pob zeb diamond, Zn thiab Sn muaj ntau qhov sib xws, xws li cov ntsiab lus melting tsawg thiab zoo deformability, thaum Zn tsis zoo ntawm kev hloov cov wettability ntawm pob zeb diamond li Sn.Lub vapor siab ntawm hlau Zn yog siab heev thiab nws yooj yim rau gasify, yog li nws yog ib qho tseem ceeb uas yuav tau xyuam xim rau cov nyiaj Zn siv nyob rau hauv pob zeb diamond cuab tam binders.
Lub luag hauj lwm ntawm txhuas: Hlau txhuas yog ib qho zoo heev lub teeb hlau thiab ib tug zoo deoxidizer.Ntawm 800 ℃, lub kaum sab xis ntub dej ntawm Al ntawm pob zeb diamond yog 75 °, thiab ntawm 1000 ℃, lub kaum sab xis ntub dej yog 10 °.Ntxiv cov hmoov txhuas rau hauv cov ntaub ntawv ntawm cov cuab yeej pob zeb diamond tuaj yeem tsim carbide theem Ti Å AlC thiab intermetallic compound TiAl hauv matrix alloy.
Lub luag hauj lwm ntawm hlau: Hlau muaj ob lub luag hauj lwm nyob rau hauv lub binder, ib tug yog tsim carburized carbides nrog pob zeb diamond, thiab lwm yam yog rau alloy nrog lwm cov ntsiab lus los txhawb lub matrix.Lub wettability ntawm hlau thiab pob zeb diamond yog zoo dua li ntawm tooj liab thiab txhuas, thiab adhesion ua hauj lwm ntawm hlau thiab pob zeb diamond yog siab tshaj li ntawm cobalt.Thaum qhov tsim nyog cov pa roj carbon monoxide yaj hauv Fe raws li cov alloys, nws yuav muaj txiaj ntsig zoo rau lawv txoj kev sib txuas nrog cov pob zeb diamond.Nruab nrab etching ntawm pob zeb diamond los ntawm Fe raws li alloys tuaj yeem ua rau kom muaj zog sib txuas ntawm daim ntawv cog lus thiab pob zeb diamond.Cov pob txha tawg tsis yog du thiab liab qab, tab sis npog los ntawm ib txheej ntawm cov hlau, uas yog ib qho kev qhia ntawm kev sib koom ua ke kom muaj zog.
Lub luag hauj lwm ntawm cobalt: Co thiab Fe muaj nyob rau hauv cov pab pawg neeg hloov pauv, thiab ntau tus yam ntxwv zoo sib xws.Co tuaj yeem tsim carbide Co ₂ C nrog pob zeb diamond nyob rau hauv tej yam kev mob, thaum tseem kis tau ib tug nyias nyias cobalt zaj duab xis nyob rau saum npoo ntawm pob zeb diamond.Nyob rau hauv txoj kev no, Co tuaj yeem txo qhov kev sib tshuam sab hauv nruab nrab ntawm Co thiab pob zeb diamond, thiab muaj qhov tseem ceeb adhesion ua hauj lwm rau pob zeb diamond nyob rau hauv cov kua theem, ua rau nws yog ib qho zoo heev cov khoom sib txuas.
Lub luag haujlwm ntawm npib tsib xee: Hauv kev khi ntawm cov cuab yeej pob zeb diamond, Ni yog ib qho tseem ceeb ntawm cov khoom.Hauv Cu raws li cov alloys, qhov sib ntxiv ntawm Ni tuaj yeem ua kom yaj nrog Cu, ntxiv dag zog rau matrix alloying, txo qis melting point hlau poob, thiab nce toughness thiab hnav tsis kam.Ntxiv Ni thiab Cu rau Fe alloys tuaj yeem txo qhov kub thiab txias thiab txo cov thermal corrosion ntawm cov hlau sib txuas ntawm cov pob zeb diamond.Xaiv ib qho kev sib xyaw ua ke ntawm Fe thiab Ni tuaj yeem txhim kho lub zog tuav ntawm Fe raws li kev sib khi ntawm pob zeb diamond.
Lub luag haujlwm ntawm manganese: Hauv cov ntaub ntawv hlau, manganese muaj cov nyhuv zoo ib yam rau cov hlau, tab sis muaj zog permeability thiab deoxygenation muaj peev xwm, thiab nws muaj oxidation.Qhov sib ntxiv ntawm Mn feem ntau tsis siab, thiab lub ntsiab lus tseem ceeb yog siv Mn rau deoxidation thaum sintering alloying.Qhov seem Mn tuaj yeem koom nrog kev sib tsoo thiab ntxiv dag zog rau matrix.
Lub luag haujlwm ntawm chromium: Hlau chromium yog ib qho muaj zog carbide-forming keeb thiab kuj yog ib qho khoom siv dav siv.Nyob rau hauv lub pob zeb diamond zawj pom hniav matrix, muaj cov chromium txaus kom muaj lub suab attenuation nyhuv, uas muaj feem xyuam rau kev ua kom lub zog ntawm Cr.Ntxiv ib qho me me ntawm Cr rau Cu raws matrix tuaj yeem txo lub kaum sab xis ntawm cov tooj liab raws li alloy rau pob zeb diamond thiab txhim kho lub zog sib txuas ntawm tooj liab raws li alloy rau pob zeb diamond.
Lub luag haujlwm ntawm titanium: titanium yog lub zog carbide tsim cov khoom uas yooj yim rau oxidize thiab nyuaj rau txo.Thaum muaj cov pa oxygen, Ti nyiam tsim TiO2 hloov TiC.Titanium hlau yog cov khoom siv zoo nrog lub zog muaj zog, txo qis zog ntawm qhov kub thiab txias, tiv thaiv corrosion, corrosion kuj, thiab siab melting point.Kev tshawb fawb tau pom tias ntxiv qhov tsim nyog ntawm titanium rau pob zeb diamond saw hniav matrix yog qhov zoo rau kev txhim kho lub neej kev pab cuam ntawm cov saw hniav.
2.Vim li cas cov saw hniav yuav tsum phim lub pob zeb txiav?
Cov txheej txheem tseem ceeb ntawm pob zeb fragmentation thaum lub sij hawm sawb txiav txheej txheem yog fracturing thiab crushing, nrog rau cov ntim loj shear thiab fragmentation, supplemented los ntawm nto sib tsoo.Lub pob zeb diamond nrog serrated ua hauj lwm nto ua hauj lwm raws li ib tug txiav cuab tam.Nws cov ntug txiav yog qhov chaw extrusion, qhov chaw txiav yog nyob rau hauv pem hauv ntej ntawm ntug, thiab qhov sib tsoo cheeb tsam yog nyob rau sab nraub qaum.Nyob rau hauv high-ceev txiav, pob zeb diamond hais ua haujlwm ntawm kev txhawb nqa ntawm matrix.Thaum lub sij hawm txheej txheem ntawm kev txiav pob zeb, ntawm ib sab tes, pob zeb diamond undergoes graphitization, fragmentation, thiab detachment vim kub siab generated los ntawm kev sib txhuam;Ntawm qhov tod tes, lub matrix yog hnav los ntawm kev sib txhuam thiab yaig ntawm pob zeb thiab pob zeb hmoov.Yog li ntawd, qhov teeb meem ntawm adaptability ntawm saw hniav thiab pob zeb yog qhov teeb meem ntawm hnav tus nqi ntawm pob zeb diamond thiab matrix.Cov yam ntxwv ntawm lub cuab yeej ua haujlwm ib txwm yog tias qhov poob ntawm pob zeb diamond sib tw hnav ntawm lub matrix, ua kom lub pob zeb diamond nyob rau hauv ib txwm lub xeev ntawm kev txiav ntug, tsis muaj detachment ntxov ntxov los yog du thiab nplua pob zeb diamond sib tsoo, kom ntseeg tau tias nws cov nyhuv sib tsoo yog siv tag nrho. thaum lub sijhawm ua haujlwm, ua rau ntau pob zeb diamond nyob rau hauv ib qho me ntsis tawg thiab hnav lub xeev.Yog tias lub zog thiab qhov cuam tshuam tsis zoo ntawm cov pob zeb uas tau xaiv tsawg dhau lawm, nws yuav ua rau muaj qhov tshwm sim ntawm "shaving", thiab lub cuab yeej lub neej yuav qis dua thiab kev ua haujlwm yuav hnyav, thiab txawm tias sawing yuav tsis txav;Yog hais tias lub zog siab abrasive ntau dhau raug xaiv, qhov txiav ntug ntawm cov khoom abrasive yuav tshwm sim hauv lub xeev flattened, uas ua rau muaj kev nce hauv kev txiav quab yuam thiab txo qis hauv kev ua haujlwm.
(1) Thaum hnav ceev ntawm lub matrix ntau dua li ntawm cov pob zeb diamond, nws ua rau cov pob zeb diamond ntau dhau thiab kev tshem tawm ntxov.Qhov hnav tsis kam ntawm saw hniav lub cev yog tsawg dhau, thiab cov saw hniav lub neej luv luv.
(2) Thaum hnav ceev ntawm lub matrix tsawg dua li ntawm lub pob zeb diamond, lub pob zeb diamond tshiab tsis yooj yim nthuav tawm tom qab lub pob zeb diamond txiav ntug hnav, cov serrations tsis muaj kev txiav ntug los yog txiav ntug yog tsawg heev, qhov chaw ntawm lub pob zeb diamond txiav yog hnav. cov serrations yog passivated, txiav ceev yog qeeb, thiab nws yog ib qho yooj yim ua rau lub txiav board ntog, cuam tshuam rau kev ua tau zoo.
(3) Thaum hnav ceev ntawm matrix yog sib npaug rau hnav ceev ntawm lub pob zeb diamond, nws qhia txog kev sib raug zoo ntawm matrix nrog lub pob zeb txiav.
Post lub sij hawm: Aug-11-2023