"Daim iav tiav" yog ib lo lus uas siv los piav txog qhov tsis tshua muaj roughness ntawm cov hlau. Raws li cov qauv kev lag luam dav dav, cov khoom siv hlau tuaj yeem suav tias muaj daim iav tiav thaum nws qhov roughness Ra tus nqi tsawg dua 0.8 μm. Nyob rau theem no, qhov sib txawv ntawm qhov siab ntawm qhov saum npoo thiab cov hav yog nyob ntawm qhov kev txiav txim ntawm micrometers lossis txawm nanometers, ua cov cim machining tsis pom ntawm qhov muag liab qab thiab tso cai rau pom tseeb ntawm cov khoom.
Tus nqi ntawm 0.8 μm yog "qhov pib nkag" rau daim iav tiav. Txawm li cas los xij, cov kev xav tau sib txawv ntawm cov ntawv thov sib txawv thiab cov qib tiav:
| Qib | Rau (μm) | Cov yam ntxwv zoo |
| Daim iav dav dav | Tsawg dua los yog sib npaug li 0.8 | Bright nto, pom tseeb |
| High-precision iav | Tsawg dua los yog sib npaug li 0.1 | Qhov tseem ceeb glossy daim iav nyhuv, siv rau precision qhov chaw |
| Ultra-daim iav | Tsawg dua lossis sib npaug li 0.02–0.01 | Peak-to-valley sib txawv tsuas yog nanometers |
| Qhov kawg daim iav | Tsawg dua los yog sib npaug li 0.005 | Qib saum toj kawg nkaus ntawm tam sim no ultra-precision machining |
Niobium(Nb) yog cov hlau refractory nrog lub siab melting point, zoo heev corrosion kuj, thiab superconducting zog. Nws cov kev xav tau ntawm daim iav-finish txawv ntau nyob ntawm daim ntawv thov. Cov hauv qab no yog cov qauv kev ntxhib los mos rau niobium hauv ntau qhov xwm txheej:
2.1 General Industrial thiab Machined Daim iav tiav
Rau aerospace-qib niobium alloy profiles, machined nto roughness yuav tsum yog Ra tsawg dua los yog sib npaug rau 0.8 μm, thaum dov nto yog teev ntawm Ra Less tshaj los yog sib npaug rau 1.6 μm. Cov txheej txheem ISO uas cuam tshuam rau niobium thiab nws cov alloys kuj qhia txog qhov roughness ntawm Ra tsawg dua lossis sib npaug li 0.8 μm. Qhov no sawv cev rau qhov pib pib rau "daim iav tiav" ntawm niobium.
2.2 High-Purity Niobium Sheet tom qab ua tiav Precision
High-purity niobium hlau los xij (purity Ntau dua lossis sib npaug li 99.95%) tuaj yeem ua tiav qhov roughness ntawm Ra tsawg dua lossis sib npaug li 0.8 μm tom qab kev sib tsoo precision. Sputtering lub hom phiaj ua los ntawm niobium kuj tseem yuav tsum muaj qhov roughness tsawg dua lossis sib npaug rau Ra 0.8 μm.
2.3 Superconducting thiab Electronic-Grade Daim iav tiav
Qhov xav tau daim iav xav tau tshaj plaws rau niobium yog los ntawm superconducting radio-frequency (SRF) kab noj hniav.
Superconducting lossis hluav taws xob-qib niobium, tom qab electropolishing, yuav tsum muaj qhov roughness ntawm Ra tsawg dua lossis sib npaug li 0.4 μm. Niobium sputtering lub hom phiaj kuj feem ntau xav tau Ra 0.4 μm. Rau kev siv ntau tshaj SRF kab noj hniav, niobium nyias films yuav tsum muaj ib tug roughness ntawm Ra <20 nm (0.02 μm); Tom qab cov txheej txheem polishing zoo, SRF niobium kab noj hniav tuaj yeem ua tiav cov hauv paus ntsiab lus-square roughness tsawg li <15 nm (0.015 μm).
2.4 Ultra-Precision Daim iav tiav (Nanometer Level)
Siv chemical mechanical polishing (CMP) nrog 70-100 nm silica abrasive hais, niobium wafers tuaj yeem ncav cuag daim iav tiav ntawm Ra=32 nm (0.032 μm). Plasma electrolytic polishing (PEP) tuaj yeem txo qhov roughness ntawm niobium alloys los ntawm 0.76 μm mus rau 0.11 μm. Pab pawg tshawb fawb ntawm Beijing University of Technology tau ua tiav qhov zoo ntawm Ra=0.031 μm ntawm niobium alloys los ntawm kev ua tiav.
Niobium nyias zaj duab xis npaj los ntawm magnetron sputtering tuaj yeem muaj lub hauv paus ntsiab lus-square roughness ntawm qhov kev txiav txim ntawm 0.1 nm.
Cov kev sib tw tshwm sim los ntawm cov khoom vaj khoom tsev
Niobium yog cov kua nplaum thiab yas hlau. Ntshiab niobium kuj yog mos (Vickers hardness HV0.2 tsuas yog 60-90), ua rau nws yooj yim rau "ntug-collapse" tsis xws luag thaum sib tsoo. Txoj kev polishing tsoos feem ntau tawm cov seem seem ntawm niobium nto, ua rau nws nyuaj rau ua tiav daim iav zoo tagnrho.
Main Daim iav-Finishing Methods rau Niobium
Ntau txoj hauv kev tau tsim los rau daim iav tiav ntawm niobium:
Tshuaj Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuam Txhuas Txhuas Txhuas Txhuas Txhuas Txhuas Txhuas Txhuas Txhuas Txhuas Txhuas Txhuas Txhuas Txhuas Txhuas Txhuas Txhuas
Electropolishing (EP): Superconducting-qib niobium tuaj yeem ua tiav Ra Tsawg dua lossis sib npaug li 0.4 μm tom qab electropolishing.
Plasma Electrolytic Polishing (PEP): Kev nyab xeeb thiab zoo ib puag ncig ntau dua li cov tshuaj muaj zog-acid electrolytes, nws tuaj yeem txo qhov roughness ntawm niobium alloys los ntawm 0.76 μm mus rau 0.11 μm.
Tiav / Precision Lapping: Los ntawm kev ua kom zoo dua qhov tsis xws li lapping siab (6-8 kPa), slurry pH (10), thiab abrasive grit loj (W0.5), ib qho ultra-daim iav tiav ntawm Ra=0.031 μm tuaj yeem ua tiav.
Laser Polishing: Macro- thiab micro-polishing nrog lasers ntawm fine-grained niobium yog tau nquag tshawb nrhiav rau SRF kab noj hniav.
Daim iav zoo ntawm niobium ncaj qha txiav txim siab nws qhov kev ua tau zoo hauv kev siv high-end:
Superconducting RF Cavities: Nto roughness ncaj qha cuam tshuam rau qhov zoo tshaj plaws (Q) thiab nrawm gradient ntawm kab noj hniav. Mechanically fine-polished niobium kab noj hniav tau ua tiav Q qhov tseem ceeb ntawm 3 × 10¹⁰ thiab accelerating gradients ntawm 43 MV / m. Txhua qhov chaw deg yuav ua rau quenching, txwv cov kab noj hniav kev ua haujlwm.
Sputtering Targets: Qhov saum npoo roughness ntawm niobium lub hom phiaj ncaj qha cuam tshuam rau qhov sib xws thiab qhov zoo ntawm cov yeeb yaj kiab tso tawm, yog li qhov yuav tsum tau ntawm Ra Tsawg dua lossis sib npaug rau 0.8 μm lossis tseem nruj dua.
Aerospace Cheebtsam: Raws li ultra-high-temperature structural cov ntaub ntawv, niobium alloys yuav tsum tau meej nto zoo rau kev ntseeg tau ntawm cov khoom tseem ceeb.
Daim iav-tiav tus qauv rau niobium spans ntau yam nyob ntawm daim ntawv thov -los ntawm Ra Less tshaj los yog sib npaug rau 0.8 μm rau kev lag luam siv, mus rau Ra <20 nm rau superconducting kab noj hniav thiab txawm mus rau 0.1 nm qib rau magnetron-sputtered niobium films. Hauv cov ntsiab lus, Ra Less tshaj lossis sib npaug li 0.8 μm sawv cev rau kev lag luam "threshold" rau daim iav niobium tiav, thaum Ra Less tshaj lossis sib npaug rau 0.02 μm (20 nm) qhia txog cov kev cai nruj ntawm cov ntawv thov kev lag luam siab kawg.
Nrog rau kev txhim kho txuas ntxiv ntawm cov txheej txheem qib siab xws li ntshav electrolytic polishing thiab tshuaj kho tshuab polishing, daim iav tiav ntawm niobium yog txav los ntawm "micron-level precision" mus rau "nanometer-level ultra-precision," muab cov khoom siv txhim khu kev qha rau kev txiav cov teb suav nrog cov particle accelerators, nuclear fusion devices, thiab aerospace engineering.
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