Kev npaj cov ntaub ntawv sib cuag AgZnO Highly Dispersed

Lub relay yog ib qho khoom siv hluav taws xob uas siv hluav taws xob me me los tswj cov tam sim no loj hauv Circuit Court. Nws yog "automatic hloov" uas tau hloov kho lub voj voog, muab kev tiv thaiv kev nyab xeeb, thiab hloov lub voj voog. Cov khoom siv sib txuas sib txuas muaj xws li AgSnO2, AgNi, AgCdO, AgZnO, thiab AgCuO. Ntawm lawv, AgCdO Copper Silver Contact Rivet cov ntaub ntawv yog nquag ua rau muaj kuab paug cadmium thaum lub sijhawm tsim khoom. Lub EU pib txwv kev siv cov khoom uas muaj cadmium thaum Lub Rau Hli 1, 2006. AgZnO cov ntaub ntawv muaj cov yam ntxwv ntawm lub sijhawm luv luv, kev ua haujlwm siab tawg, muaj zog tam sim no poob siab, thiab tsis muaj kev puas tsuaj rau ib puag ncig nyob rau hauv cov xwm txheej tsis tshua muaj hluav taws xob. AgZnO cov ntaub ntawv tau maj mam tshwm sim los hloov cov ntaub ntawv uas tsis yog ib puag ncig zoo xws li AgCdO. AgZnO cov ntaub ntawv feem ntau yog siv rau hauv lub cev muaj zog, LED relays, lub hwj chim relays, universal circuit breakers, thiab lwm yam. Cov txheej txheem kev npaj rau AgZnO hluav taws xob tiv tauj cov ntaub ntawv muaj xws li cov khoom siv hmoov sib tov thiab cov txheej txheem oxidation alloy. Ntawm lawv, cov khoom siv hmoov sib xyaw yog feem ntau siv rau hauv kev tsim cov khoom siv AgZnO vim nws qhov zoo ntawm lub voj voog luv luv thiab kev ua haujlwm yooj yim. Txawm li cas los xij, vim qhov me me ntawm ZnO hmoov, nws yog ib qho nyuaj rau disperse thiab yooj yim rau agglomerate, ua rau cov khoom tsis ruaj tsis khov ntawm AgZnO cov ntaub ntawv npaj los ntawm cov neeg kho tshuab hmoov sib tov. Txoj kev tshawb no siv ultrasonic dispersion txoj kev los npaj AgZnO cov ntaub ntawv, thiab muab piv nrog cov neeg kho tshuab hmoov sib tov txheej txheem AgZnO. Qhov sib txawv ntawm nws lub koom haum thiab kev ua tau zoo nyob rau hauv cov txheej txheem kev npaj sib txawv raug txheeb xyuas kom tau txaisSilver Point Sib cuagcov ntaub ntawv nrog kev ua tau zoo heev, tso lub hauv paus rau kev txhim kho cov khoom siv hluav taws xob hauv tsev tshiab.

1.1 Mechanical hmoov mixing method
Cov khoom siv raw khoom yog 200 mesh silver hmoov (purity Ntau dua lossis sib npaug li 99.9%) thiab ZnO hmoov (purity Ntau dua lossis sib npaug li 99.9%). Tom qab cov hmoov sib tov yog isostatically nias, nws yog sintered ntawm 840 degree ~ 860 degree rau 3 h nyob rau hauv ib tug huab cua cua, thiab ces re-pressed thiab extruded rau hauv xov hlau. Thaum kawg, cov khoom tiav yog tau los ntawm kev kos duab thiab tshuaj xyuas.

1.2 Ultrasonic dispersion txoj kev
Txoj kev ultrasonic dispersion siv lub hauv paus ntsiab lus ntawm cavitation nyhuv . Thaum ultrasonic kev co yog kis mus rau cov kua, vim lub siab siv lub suab, nws yuav txhawb kom muaj zog cavitation nyhuv nyob rau hauv cov kua, uas ua rau ib tug loj tus naj npawb ntawm cavitation npuas nyob rau hauv cov kua. Raws li cov npuas cavitation no tau tsim thiab tawg, ntau tus microjets yuav tsim nyob rau hauv cov kua, rhuav tshem cov hmoov sib xyaw loj dua hauv cov kua. Nyob rau tib lub sijhawm, vim qhov kev vibration ntawm ultrasonic yoj, cov khoom thiab cov kua yog sib xyaw kom huv si, yog li txhawb kev sib xyaw ntawm Ag hmoov thiab ZnO hmoov.

Cov ntaub ntawv xeem yog dej cawv, Ag hmoov thiab ZnO hmoov. Qhov piv ntawm Ag hmoov rau ZnO hmoov yog 7.5: 1, cawv yog 5 L, lub sij hawm ultrasonic vibration yog 20 min, stirring plays lub luag hauj lwm sib tov, thiab ceev yog 120 r / min. Nyob rau hauv lub cavitation nyhuv ntawm lub ultrasonic yoj, cov hmoov yog crushed rau hauv zoo hais thiab sib tov tusyees. Tom qab ntawd cov kua sib tov yog nchuav rau hauv lub tais thiab muab tso rau hauv qhov cub kom qhuav. Tom qab ziab, cov hmoov sib xyaw yog isostatically nias, sintered ntawm 840 degree -860 degree hauv huab cua rau 3 teev, thiab tom qab ntawd nias thiab extruded rau hauv cov xov hlau. Thaum kawg, cov khoom tiav raug kos thiab tshuaj xyuas. Peb Cov Hluav Taws Xob ContactorSilver Contactsundergo ntau txheej ntawm kev tshuaj xyuas kom ntseeg tau tias txhua yam khoom yog cov khoom zoo.

1.3 Kev Ntsuas thiab Kev Ntsuas Tus Kheej
Txoj kev Archimede yog siv los ntsuas cov qauv ntom ntom; Brinell hardness tester yog siv los ntsuas cov qauv hardness; tus choj txoj kev yog siv los xyuas cov qauv resistivity; metallographic microscope yog siv los soj ntsuam cov qauv microstructure; Lub tshuab ntsuas hluav taws xob siv hluav taws xob (SEM) yog siv los soj ntsuam cov qauv tawg morphology.

2.1 Metallographic qauv tsom xam
Daim duab 1(a) thiab daim duab 1(b) yog cov duab metallographic duab ntawm AgZnO cov khoom npaj los ntawm cov khoom siv hmoov sib xyaw thiab cov txheej txheem ultrasonic dispersion, feem. Nws tuaj yeem pom los ntawm cov qauv metallographic uas ob txoj hauv kev tuaj yeem ua tiav cov ntaub ntawv AgZnO, tab sis ZnO cov khoom nyob rau hauv cov nyiaj matrix ntawm AgZnO cov khoom npaj los ntawm cov tshuab hmoov sib tov yog agglomerated thiab tsis sib xws. Qhov kev faib tawm tsis sib xws ntawm lub zog txhawb nqa yuav cuam tshuam ncaj qha rau kev ua haujlwm ntawm cov khoom, uas ua rau muaj kev hloov pauv ntawm cov khoom siv hluav taws xob thiab hluav taws xob ntawm cov khoom. Nyob rau hauv AgZnO cov ntaub ntawv npaj los ntawm ultrasonic dispersion txoj kev, ZnO hais yog tusyees dispersed ntawm Ag matrix. Qhov no yog vim hais tias lub ultrasonic dispersion system belongs rau cov khoom-kua dispersion system. Piv nrog rau cov khoom sib xyaw ua ke ntawm cov hmoov sib tov, ZnO hmoov tuaj yeem tawg tag nrho hauv Ag. Tom qab nias, sintering thiab alloying, lawv tuaj yeem tawg mus rau hauv Ag matrix raws li cov khoom me me. Raws li txoj kev xav ntawm qhov system dispersion, lub uniformity ntawm cov khoom-kua dispersion system yog ntau ntau dua li cov khoom-kua dispersion system. Yog li ntawd, piv nrog cov hmoov sib tov, AgZnO cov khoom npaj los ntawm ultrasonic dispersion muaj cov yam ntxwv ntawm finer reinforcement theem, ntau uniform dispersion, thiab txo agglomeration. Cov nyiaj matrix siv hauv peb Cov Khoom Siv Nyiaj Sib Txuas Rivet muaj qhov zoo thiab tuaj yeem muab kev ua haujlwm ruaj khov.

2.2 Fracture SEM tsom xam
Daim duab 2(a) thiab daim duab 2(b) yog 500 lub sij hawm tawg SEM morphology cov duab ntawm AgZnO cov khoom npaj los ntawm cov neeg kho tshuab hmoov sib tov txoj kev thiab ultrasonic dispersion txoj kev, feem. Los ntawm kev sib piv, nws tuaj yeem pom tau tias AgZnO cov khoom npaj los ntawm cov khoom siv hmoov sib xyaw ua ke muaj kev sib txuas tsis zoo, thiab cov agglomerated ZnO hais muaj ntau qhov pores. Nws yog ib qho yooj yim rau nkig tawg thaum tiv thaiv sab nraud quab yuam, thiab cov pob txha tsis sib xws; Thaum cov khoom siv AgZnO npaj los ntawm txoj kev ultrasonic dispersion muaj nruj nrog kev sib raug zoo thiab ib qho kev puas ntsoog.
Daim duab 2(c) thiab daim duab 2(d) yog 5000 lub sij hawm tawg SEM morphology cov duab ntawm AgZnO cov khoom npaj los ntawm hmoov sib tov txoj kev thiab ultrasonic dispersion txoj kev, feem. Los ntawm kev sib piv, nws tuaj yeem pom tau tias ZnO cov khoom hauv AgZnO cov khoom npaj los ntawm cov khoom siv hmoov sib xyaw yog qhov sib txawv tsis sib xws thiab agglomerated. Qhov thib ob qhov loj me tom qab agglomeration sib txawv heev, thiab cov dimples ntawm cov hlau tawg yog qhov sib txawv. Txawm li cas los xij, ZnO theem thib ob nrog qhov loj me ntawm 1 μm yog sib npaug ntawm cov nyiaj matrix hauv AgZnO cov khoom npaj los ntawm txoj kev ultrasonic dispersion, thiab qhov dimple morphology thiab qhov loj me yog qhov zoo ib yam. Tom qab ZnO cov khoom nyob rau hauv lub tshuab hmoov sib tov txheej txheem agglomerate, qhov thib ob particle loj sib txawv heev, uas ua rau lub regional sib txawv nyob rau hauv lub plasticity ntawm cov khoom. Thaum raug rau sab nraud quab yuam, qhov kev nyiam ua rau tawg tawg yog ntxiv ntxiv [5]. Qhov thib ob-theem hais nyob rau hauv cov ntaub ntawv uas npaj los ntawm cov txheej txheem ultrasonic dispersion yog pom tseeb zoo thiab zoo ib yam, lub fractures yog tus tiaj tus, qhov tob ntawm lub dimples yeej zoo ib yam, lub internal quab yuam kuj zoo ib yam thaum lub sij hawm tawg, thiab cov khoom isotropic. . Cov khoom siv hauv pebKhoom Siv NyiajRau Cov Hluav Taws Xob muaj lub zog siab thiab hardness, uas tuaj yeem ua kom muaj kev tsim khoom ntawm qhov ntev.

2.3 Mechanical thiab Physical Properties Analysis
Daim duab 3 (a) thiab Daim duab 3 (c) yog ntom ntom thiab RistomonS piv cov duab kos duab ntawm AGZNO cov khoom npaj tau los ntawm cov neeg kho tshuab hmoov sib xyaw thiab ultrasonic dispersion, ntsig txog. Qhov kev sib piv qhia tau hais tias qhov ceev ntawm AgZnO cov khoom npaj los ntawm ultrasonic dispersion yog siab dua li ntawm AgZnO cov khoom npaj los ntawm cov hmoov sib tov. Qhov no yog vim hais tias AgZnO hmoov nyob rau hauv lub tshuab hmoov sib tov yog agglomerated thaum lub sij hawm sib tov, thiab lub pores nyob rau hauv lub agglomerates yuav tsis tau densified thaum lub sij hawm sintering txheej txheem. Raws li sintering txoj kev xav [6], cov txheej txheem densification ntawm cov khoom-theem sintering yog cov viscous ntws thiab ntim diffusion ntawm atoms. Thaum lub sij hawm sintering txheej txheem, cov agglomerated ZnO muaj cov dej tsis zoo, thiab Ag-Ag tus kheej diffusion tus nqi yog ntau dua li qhov sib txawv ntawm qhov sib txawv ntawm Ag-ZnO Cheebtsam, uas ua rau qis qis ntawm qhov ntom ntom tom qab cov txheej txheem yog densified, uas. nyob rau hauv lem ua rau tsawg ceev. Txoj kev ultrasonic dispersion tuaj yeem tawg ZnO rau hauv cov khoom me me thiab tawg rau hauv Ag matrix, ua rau Ag-ZnO thaj chaw tiv tauj thiab nthuav dav Ag-Ag conductive network cheeb tsam. Qhov ceev yog siab heev tom qab sintering densification. Lub resistivity muaj feem xyuam rau thaj tsam ntawm Ag-Ag conductive network hauv cov khoom. Txij li thaum thaj tsam ntawm Ag-Ag conductive network tsim los ntawm txoj kev ultrasonic dispersion yog nce, AgZnO cov khoom npaj los ntawm txoj kev nthuav tawm qis dua. Peb Cov KhoomSilver Contactsmuaj qhov ceev dua thiab muaj zog conductivity.

Cov duab 3(b) thiab 3(d) yog cov duab sib piv ntawm cov khoom sib piv ntawm cov khoom siv elongation thiab elongation ntawm AgZnO cov khoom npaj los ntawm kev sib xyaw cov hmoov sib tov thiab ultrasonic dispersion txoj kev, feem. Nws tuaj yeem pom los ntawm daim duab uas lub hardness ntawm AgZnO npaj los ntawm ultrasonic dispersion txoj kev yog ho ntau dua. Qhov no yog vim hais tias cov yam ntxwv hardness ntawm cov hlau matrix composite cov ntaub ntawv uas muaj li ntawm lub reinforcement theem thiab matrix cov ntaub ntawv yog tsuas yog txiav txim los ntawm cov yam ntxwv ntawm cov khoom sib xyaw thiab kev sib koom ua ke ntawm cov khoom thiab cov theem kev txhawb zog. Thaum theem thib ob yog sib npaug ntawm theem matrix nyob rau hauv daim ntawv ntawm cov nplua dispersed hais, qhov me me ntawm theem ob particle loj, qhov tseem ceeb ntxiv zog yuav raug tsim, uas yuav ua rau kom cov hardness ntawm cov khoom. Qhov kev txhawb zog no yog hu ua theem ob ntxiv dag zog. Lub elongation ntawm cov khoom yog zoo correlated nrog plasticity ntawm cov khoom. Qhov zoo dispersed theem thib ob hais tuaj yeem txhim kho cov plasticity ntawm cov khoom, uas qhia cov plasticity zoo dua.

Cov khoom siv hluav taws xob tiv tauj AgZnO tau npaj los ntawm cov khoom siv hmoov sib tov thiab ultrasonic dispersion, thiab cov teebmeem ntawm cov txheej txheem sib txawv ntawm cov khoom siv tau muab piv rau. Cov lus xaus yog raws li nram no:

(1) Muab piv nrog cov txheej txheem sib xyaw hmoov sib xyaw, kev ua tiav ntawm AgZnOSilver Hluav Taws Xob Rau Cov Khoom Siv Hluav Taws Xob tau npaj los ntawm ultrasonic dispersion zoo dua. Qhov thib ob zoo ZnO cov khoom yog sib npaug ntawm cov nyiaj matrix, thiab cov khoom siv kho tshuab zoo dua tau txais;

(2) Cov txheej txheem ultrasonic dispersion zoo txhim kho ZnO agglomeration tshwm sim hauv lub koom haum. Los ntawm cov qauv microscopic pob txha, nws tuaj yeem pom tau tias kev sib txuas sab hauv yog qhov zoo, qhov system ntom ntom tau txais, thiab kev ruaj ntseg ntawm ntau yam khoom siv tau zoo tuaj.

 

Koom tes koom tes

Peb Cov Hluav Taws Xob ContactorSilver Contactsyog ua los ntawm high-purity nyiaj cov ntaub ntawv uas zoo heev conductivity thiab corrosion kuj, kom ruaj khov nyob rau hauv ntau yam khoom siv hluav taws xob. Nrog cov txheej txheem ua tiav thiab kev tswj xyuas nruj, peb cov nyiaj tiv tauj tuaj yeem tsis tsuas yog ua kom lub neej kev pab cuam ntawm cov khoom siv hluav taws xob zoo, tab sis kuj txo qis hluav taws xob thiab cov nqi kho mob. Txawm hais tias nyob rau hauv high-frequency switches, relays, los yog contactors, Solid Silver Contact Rivet yog ib qho kev xaiv txhim khu kev qha. Xaiv peb cov nyiaj hu xov tooj txhais tau tias xaiv cov khoom siv hluav taws xob zoo, ruaj khov thiab ua haujlwm zoo los pab koj cov cuab yeej ua haujlwm ruaj khov rau lub sijhawm ntev.