Lub hauv paus ntsiab lus ntawm pob zeb diamond mulching txheej los txhim kho lub peev xwm ntawm pob ntawv ntxig

1. Kev tsim cov pob zeb diamond uas muaj carbide

Lub hauv paus ntsiab lus ntawm kev sib tov hmoov hlau nrog pob zeb diamond, cua sov rau qhov kub thiab txias thiab rwb thaiv tsev rau ib lub sijhawm hauv lub tshuab nqus tsev. Ntawm qhov kub no, lub zog vapor ntawm cov hlau txaus rau kev npog, thiab tib lub sijhawm, cov hlau raug adsorbed rau ntawm qhov chaw pob zeb diamond los ua ib lub pob zeb diamond coated.

2. Kev xaiv cov hlau coated

Yuav kom ua rau lub pob zeb diamond txheej ruaj khov thiab txhim khu kev qha, thiab kom nkag siab zoo dua txog qhov cuam tshuam ntawm cov khoom sib xyaw ntawm lub zog txheej, cov hlau txheej yuav tsum tau xaiv. Peb paub tias pob zeb diamond yog ib qho alloomorphism ntawm C, thiab nws lub lattice yog ib qho tetrahedron ib txwm muaj, yog li lub hauv paus ntsiab lus ntawm kev txheej cov hlau sib xyaw yog tias cov hlau muaj qhov sib raug zoo rau carbon. Ua li no, nyob rau hauv qee qhov xwm txheej, kev sib cuam tshuam tshuaj tshwm sim ntawm qhov sib txuas, tsim cov tshuaj sib txuas ruaj khov, thiab Me-C membrane yog tsim. Lub tswv yim infiltration thiab adhesion hauv lub kaw lus pob zeb diamond-hlau taw qhia tias kev sib cuam tshuam tshuaj tshwm sim tsuas yog thaum qhov kev ua haujlwm adhesion AW> 0 thiab ncav cuag qee qhov nqi. Cov ntsiab lus luv luv pawg B hlau hauv lub rooj periodic, xws li Cu, Sn, Ag, Zn, Ge, thiab lwm yam muaj qhov sib raug zoo tsis zoo rau C thiab kev ua haujlwm adhesion qis, thiab cov ntawv cog lus tsim yog cov ntawv cog lus molecular uas tsis muaj zog thiab yuav tsum tsis txhob xaiv; cov hlau hloov pauv hauv lub rooj ntev ntev, xws li Ti, V, Cr, Mn, Fe, thiab lwm yam, muaj kev sib txuas loj nrog lub kaw lus ntawm C. Lub zog sib cuam tshuam ntawm C thiab cov hlau hloov pauv nce nrog tus lej ntawm d txheej electrons, yog li Ti thiab Cr yog qhov tsim nyog dua rau kev npog cov hlau.

3. Kev sim teeb

Ntawm qhov kub ntawm 8500C, pob zeb diamond tsis tuaj yeem ncav cuag lub zog dawb ntawm cov pa roj carbon activated ntawm qhov chaw pob zeb diamond thiab hmoov hlau los tsim cov hlau carbide, thiab tsawg kawg 9000C kom ua tiav lub zog xav tau rau kev tsim cov hlau carbide. Txawm li cas los xij, yog tias qhov kub siab dhau, nws yuav tsim kev poob hluav taws xob rau pob zeb diamond. Xav txog qhov cuam tshuam ntawm qhov yuam kev ntsuas kub thiab lwm yam, qhov kub ntawm kev sim txheej txheem yog teeb tsa ntawm 9500C. Raws li tuaj yeem pom los ntawm kev sib raug zoo ntawm lub sijhawm rwb thaiv tsev thiab qhov ceev ntawm cov tshuaj tiv thaiv (hauv qab no),? Tom qab ncav cuag lub zog dawb ntawm cov hlau carbide tiam, cov tshuaj tiv thaiv ua tiav sai, thiab nrog rau lub sijhawm ntawm carbide, qhov nrawm ntawm cov tshuaj tiv thaiv yuav maj mam qeeb. Tsis muaj kev poob siab tias nrog kev ncua sijhawm rwb thaiv tsev, qhov ceev thiab qhov zoo ntawm txheej yuav raug txhim kho, tab sis tom qab 60 feeb, qhov zoo ntawm txheej tsis cuam tshuam loj heev, yog li peb teeb tsa lub sijhawm rwb thaiv tsev li 1 teev; qhov siab dua qhov nqus tsev, qhov zoo dua, tab sis txwv rau cov xwm txheej sim, peb feem ntau siv 10-3mmHg.

Lub hauv paus ntsiab lus ntawm kev txhim kho peev xwm ntawm pob khoom

Cov txiaj ntsig ntawm kev sim qhia tau hais tias lub cev me nyuam muaj zog dua rau lub pob zeb diamond coated dua li lub pob zeb diamond tsis tau coated. Qhov laj thawj rau lub peev xwm muaj zog ntawm lub cev me nyuam rau lub pob zeb diamond coated yog tias, tus kheej, muaj qhov tsis zoo ntawm qhov chaw thiab cov kab nrib pleb me me ntawm qhov chaw lossis sab hauv ntawm cov pob zeb diamond cuav tsis tau coated. Vim muaj cov kab nrib pleb me me no, lub zog ntawm lub pob zeb diamond txo qis, ntawm qhov tod tes, C element ntawm lub pob zeb diamond tsis tshua muaj kev cuam tshuam nrog cov khoom ntawm lub cev me nyuam. Yog li ntawd, lub cev log ntawm lub pob zeb diamond tsis tau coated tsuas yog lub pob extrusion mechanical, thiab hom pob ntawv ntxig no tsis muaj zog heev. Thaum lub nra hnyav, cov kab nrib pleb me me saum toj no yuav ua rau muaj kev ntxhov siab, ua rau muaj kev poob qis ntawm lub peev xwm ntxig pob. Cov ntaub ntawv ntawm pob zeb diamond overburden txawv, vim yog plating ntawm zaj duab xis hlau, cov pob zeb diamond lattice defects thiab cov kab nrib pleb me me raug sau, ntawm ib sab tes, lub zog ntawm lub pob zeb diamond coated yog nce, ntawm qhov tod tes, puv nrog cov kab nrib pleb me me, tsis muaj qhov tshwm sim ntawm kev ntxhov siab ntxiv lawm. Qhov tseem ceeb tshaj plaws, qhov infiltration ntawm cov hlau sib txuas hauv lub cev log hloov pauv mus rau hauv cov pa roj carbon ntawm qhov chaw pob zeb diamond. Qhov tshwm sim yog cov hlau sib txuas ntawm lub kaum sab xis ntub ntawm pob zeb diamond los ntawm ntau dua 100 o mus rau tsawg dua 500, zoo heev txhim kho cov hlau sib txuas rau pob zeb diamond ntub, ua rau lub cev log tsheb ntawm lub pob zeb diamond npog teeb tsa los ntawm thawj lub pob khoom siv extrusion rau hauv pob khoom sib txuas, uas yog lub pob zeb diamond npog thiab lub cev log tsheb sib txuas, yog li txhim kho lub cev menyuam hauv plab.

Muaj peev xwm teeb tsa pob khoom. Tib lub sijhawm, peb kuj ntseeg tias lwm yam xws li cov yam ntxwv sintering, qhov loj me ntawm cov pob zeb diamond coated, qib, qhov loj me ntawm lub cev me nyuam hauv plab thiab lwm yam muaj qee yam cuam tshuam rau lub zog ntawm pob khoom. Lub zog sintering tsim nyog tuaj yeem ua rau kom muaj qhov ceev nias thiab txhim kho qhov nyuaj ntawm lub cev me nyuam hauv plab. Qhov kub sintering tsim nyog thiab lub sijhawm rwb thaiv tsev tuaj yeem txhawb nqa qhov kub siab ntawm cov tshuaj lom neeg ntawm lub cev log tsheb thiab cov hlau coated thiab pob zeb diamond, yog li ntawd pob khoom sib txuas tau teeb tsa ruaj khov, qib pob zeb diamond zoo, cov qauv siv lead ua zoo sib xws, theem zoo sib xws yog soluble, thiab pob khoom teeb tsa zoo dua.

Sau los ntawm Liu Xiaohui