Stellite alloy yog cov ntsiab lus dav dav rau cov khoom siv cobalt-chromium alloys uas tiv taus kub kub, hnav thiab corrosion. "Stellite" yog Ameslikas patent ntawm Deloro Group. Xyoo 2012, Deloro Stellite Group tau txais los ntawm Kennametal thiab tau dhau los ua cov cim lag luam ntawm Kennametal, siv los xa mus rau cov khoom siv cobalt tshwj xeeb.
Cov tshuaj muaj pes tsawg leeg ntawm Stellite alloy:
Stellite alloy belongs rau tsev neeg cobalt-based alloy thiab feem ntau muaj cov ntsiab lus hauv qab no:
Cobalt (Co): Ib lub ntsiab lus matrix, suav txog kwv yees li 50-65% ntawm tag nrho qhov hnyav, muab lub zog kub kub thiab thermal qaug zog.
Chromium (Cr): Nws cov ntsiab lus feem ntau yog nyob nruab nrab ntawm 25% thiab 33%, thiab nws yog tus yuam sij rau kev tsim cov txheej tiv thaiv ntom ntom ntawm chromium oxide (Cr₂O₃), ua rau cov hlau tsis muaj zog nrog kev kub siab oxidation thiab corrosion.
Tungsten (W) thiab molybdenum (Mo): Cov ntsiab lus tseem ceeb ntawm cov khoom txhawb zog. Qee cov tungsten lossis molybdenum yuav ua ke nrog cov pa roj carbon monoxide los tsim cov carbide nyuaj, ua kom cov tawv tawv tawv thiab hnav tsis kam ntawm cov hlau.
Cov pa roj carbon (C): Cov ntsiab lus hloov pauv ntawm 0.1% thiab 3.0%. Cov pa roj carbon yog cov ntsiab lus tseem ceeb hauv kev tsim cov carbides (xws li MC, M₂₃C₆, M₇C₃), uas yog embedded nyob rau hauv cov cobalt matrix zoo li steel tuav, tsim "skeleton" rau cov alloy los tiv thaiv hnav.
Lub zog ntawm Stellite alloy feem ntau yog los ntawm austenite matrix ntxiv dag zog los ntawm cov khoom siv tshuaj thiab cov carbides faib hauv matrix. Qhov tshwj xeeb ntxiv dag zog rau lub cev no ua rau Stellite alloy muaj kev poob qis hauv lub zog thaum qhov kub thiab txias, ua rau nws muaj kev ruaj ntseg siab heev.
Cov qib tseem ceeb thiab cov yam ntxwv ntawm Stellite alloy:
Hnav-resistant series
Stellite 1: Qib siab-carbon thiab high-tungsten nrog hardness txog HRC 48-55. Nws muaj kev ua haujlwm zoo los tiv thaiv abrasive thiab haum rau lub rooj zaum valve, bearings thiab hnav-resistant liners, thiab lwm yam.
Stellite 4: Siab zog, siab hardness. Nws yog tsim rau txias stamping tuag, high-stress hnav qhov chaw, thiab lwm yam.
Stellite 6: Cov qib ntau yam thiab classic, nws yog hu ua "Jack ntawm txhua yam". Nws muaj qhov sib npaug zoo tshaj plaws ntawm hardness (txog HRC 40) thiab toughness, thiab tseem muaj cov yam ntxwv zoo heev, kev tiv thaiv corrosion thiab kub-resistant. Nws yog dav siv nyob rau hauv valve sealing nto, cav li qub thiab ntau yam bushings, thiab lwm yam.
Stellite 12: Nws qhov kev ua tau zoo nyob nruab nrab ntawm Stellite 1 thiab Stellite 6, nrog lub hardness ntawm kwv yees li HRC 45. Nws yog ib qho nyuaj thiab hnav-tiv taus ntau dua li Stellite 6, thiab haum rau qhov kub thiab txias li qub, sawteeth, ntsia hlau thawb qws, thiab tswj li qub.
Stellite 20: Ib qib uas tsis tshua muaj siab hardness (kwv yees li HRC 60), feem ntau yog tsim los rau kev hnav tsis zoo, thiab feem ntau siv rau hauv lub tes tsho, hnav-tiv taus daim hlau, thiab cov nplhaib sib khi.
Stellite 100: Impact-resistant thiab cavitation resistant, feem ntau yog tsim los rau huab cua abrasive hnav, feem ntau yog siv rau hauv lub twj tso kua mis impellers, turbine hniav, thiab cov khoom siv tshuaj.
High-temperature/corrosion-resistant series
Stellite 21: Cov qib qis-carbon, molybdenum-muaj qib nrog zoo toughness thiab zoo heev thermal shock kuj. Gas turbine hniav, high-temperature li qub, nuclear kev lag luam Cheebtsam.
Stellite 31 (X-40): Muaj cov npib tsib xee, nws muaj lub zog kub kub thiab thermal qaug zog, thiab tau ntev tau siv los ua cov khoom siv rau kev qhia vanes hauv cov tshuab aero thiab cov khoom siv roj turbines.
Stellite 25: Cov ntsiab lus qis carbon, nrog rau kev ua haujlwm zoo rau thermal qaug zog, oxidation thiab sulfidation, haum rau combustion chamber Cheebtsam.
Tshwj xeeb Performance Series
Tribaloy T-400: Cov ntsiab lus siab molybdenum, zoo heev-kub nws tus kheej-lubricating khoom, ua tiav high-temperature self-lubrication los ntawm Laves theem, tshwj xeeb tshaj yog haum rau lub rooj vag li qub thiab roj-dawb lubrication Cheebtsam nyob rau hauv high-temperature thiab corrosive media.
Tribaloy T-800: High molybdenum thiab siab chromium, nrog kev hnav zoo dua li T-400, haum rau kev xav tau ntau, corrosive thiab kub kub ib puag ncig.
Qhov zoo thiab qhov tsis zoo ntawm Stellite alloy
Qhov zoo
Qhov zoo tshaj plaws liab hardness: Qhov tseem ceeb tshaj plaws ntawm Stellite alloy yog tias nws muaj peev xwm tuav tau siab hardness thiab lub zog txawm nyob rau hauv qhov kub ntawm 650 mus rau 1000 ℃. Nws cov carbides tsis rov ua dua kom txog thaum siab txog 1100 ℃, uas nyuaj rau ntau cov khoom siv hlau thiab npib tsib xee kom ua tiav.
Comprehensive corrosion kuj: Cov ntsiab lus chromium siab ua rau nws tsim ib qho kev ruaj khov passivation zaj duab xis nyob rau hauv ntau yam corrosive media, xws li dej hiav txwv, sulfuric acid, nitric acid thiab high-temperature gas, qhia tau zoo heev tiv thaiv ob qho tib si thiab hauv zos corrosion. Tshwj xeeb tshaj yog nyob rau hauv cov nqe lus ntawm kev tiv thaiv rau thermal corrosion (xws li sulfidation), Stellite alloys feem ntau superior rau npib tsib xee-raws li alloys vim lub siab melting point ntawm cobalt sulfides.
Zoo hnav tsis kam: Txawm hais tias nws yog intermetallic kev sib txhuam hnav (nplaum hnav) los yog yaig hnav los ntawm cov dej uas muaj cov khoom, Stellite alloy ua tau zoo heev. Nws muaj cov coefficient tsawg ntawm kev sib txhuam thiab muaj zog tiv thaiv khawb.
Zoo heev thermal qaug zog tsis kam: Nws tuaj yeem tiv taus qhov kub thiab txias hloov pauv (thermal shock) yam tsis muaj kev tawg, ua rau nws tsim nyog rau nquag pib-nres cov xwm txheej ntawm li qub, pwm, thiab lwm yam.
Qhov tsis zoo
Lub zog nruab nrab kub tsis txaus: Ntawm qhov kub nruab nrab (xws li 600-800 ℃), lub zog ntawm Stellite alloys feem ntau tsuas yog 50-75% ntawm cov nickel-raws li alloys vim tsis muaj kev sib koom ua ke kom muaj zog.
Kev ua haujlwm siab: Vim nws qhov siab hardness thiab siab toughness, kev txiav ntawm Stellite alloy yog qhov nyuaj heev. Feem ntau, tsuas yog kev sib tsoo lossis kev ua haujlwm tshwj xeeb tuaj yeem siv tau, ua rau cov nqi tsim khoom siab rau cov khoom.
Cov peev txheej tsis txaus: Cobalt yog ib qho khoom siv tseem ceeb. Nws cov peev nyiaj thoob ntiaj teb tau txwv thiab tsis sib xws, uas ua rau tus nqi siab ntawm Stellite alloy. Rau qee qhov, qhov no txwv nws daim ntawv thov loj.
Txwv tsis pub oxidation tsis kam: Txawm tias nws zoo heev tiv thaiv thermal corrosion, oxidation tsis kam ntawm Stellite alloys nyob rau hauv cov ntshiab high-temperature oxidation ib puag ncig yog feem ntau qis dua cov nickel-based alloys.
