Daim ntawv thov ntawm α-alumina hauv tshiabalumina ceramics
Txawm hais tias muaj ntau yam ntawm cov khoom siv ceramic tshiab, lawv tuaj yeem faib ua peb pawg raws li lawv txoj haujlwm thiab kev siv: cov khoom siv ceramics (tseem hu ua hluav taws xob ceramics), cov qauv ceramics (tseem hu ua engineering ceramics) thiab bioceramics. Raws li cov khoom siv raw sib txawv siv, lawv tuaj yeem muab faib ua oxide ceramics, nitride ceramics, boride ceramics, carbide ceramics thiab hlau ceramics. Ntawm lawv, alumina ceramics tseem ceeb heev, thiab nws cov khoom siv raw yog α-alumina hmoov ntawm ntau yam tshwj xeeb.
α-alumina yog dav siv nyob rau hauv zus tau tej cov ntau yam tshiab ceramic cov ntaub ntawv vim nws siab zog, siab hardness, siab kub kuj, hnav kuj thiab lwm yam zoo heev zog. Nws tsis yog tsuas yog hmoov raw khoom rau siab heev alumina ceramics xws li integrated circuit substrates, dag gems, txiav cov cuab yeej, cov pob txha dag, thiab lwm yam, tab sis kuj yuav siv tau raws li ib tug phosphor carrier, advanced refractory cov ntaub ntawv, tshwj xeeb sib tsoo cov ntaub ntawv, thiab lwm yam. Nrog rau kev loj hlob ntawm niaj hnub science thiab technology, daim ntawv thov teb ntawm α-alumina yog sai heev expands, thiab kev lag luam prospects.
Kev siv ntawm α-alumina hauv kev ua haujlwm ceramics
Functional ceramicsxa mus rau cov ceramics siab heev uas siv lawv cov hluav taws xob, sib nqus, acoustic, kho qhov muag, thermal thiab lwm yam khoom lossis lawv cov teebmeem sib txuas kom ua tiav qee yam haujlwm. Lawv muaj ntau yam khoom siv hluav taws xob xws li rwb thaiv tsev, dielectric, piezoelectric, thermoelectric, semiconductor, ion conductivity thiab superconductivity, yog li lawv muaj ntau txoj haujlwm thiab siv dav heev. Tam sim no, cov tseem ceeb uas tau muab tso rau hauv qhov kev siv ntawm cov nplai loj yog insulating ceramics rau kev sib txuas hauv Circuit Court substrates thiab ntim, automotive spark plug insulating ceramics, capacitor dielectric ceramics dav siv hauv TV thiab video recorders, piezoelectric ceramics nrog ntau yam kev siv thiab rhiab ceramics rau ntau yam sensors. Tsis tas li ntawd, lawv kuj tau siv rau high-pressure sodium teeb lub teeb-emitting raj.
1. Spark plug insulating ceramics
Spark plug insulating ceramics yog tam sim no tsuas yog daim ntawv thov loj tshaj plaws ntawm ceramics hauv cov cav. Vim hais tias alumina muaj cov hluav taws xob zoo heev, muaj zog txhua yam, kev kub siab ua haujlwm thiab thermal poob siab, alumina insulating spark plugs tau siv dav hauv ntiaj teb. Cov kev cai rau α-alumina rau lub txim hluav taws xob yog cov tsis tshua muaj sodium α-alumina micropowders, uas cov ntsiab lus sodium oxide yog ≤0.05% thiab qhov nruab nrab particle loj yog 325 mesh.
2. Integrated Circuit Court substrates thiab ntim khoom
Ceramics siv los ua cov ntaub ntawv substrate thiab cov khoom ntim yog superior rau cov yas hauv cov hauv qab no: kev tiv thaiv kev tiv thaiv siab, tshuaj lom neeg corrosion, siab sealing, tiv thaiv kev ya raws, tsis muaj reactivity, thiab tsis muaj kuab paug rau ultra-ntshiab semiconductor silicon. Cov khoom ntawm α-alumina xav tau rau kev sib txuas hauv Circuit Court substrates thiab ntim cov ntaub ntawv yog: thermal expansion coefficient 7.0 × 10-6 / ℃, thermal conductivity 20-30W / K·m (chav kub), dielectric tas li 9-12 (IMHz), dielectric poob 3 ~ 10-4 (IMHz), ntim resistivity 1· 1012-cm (1012-Ω).
Nrog rau kev ua haujlwm siab thiab kev sib koom ua ke ntawm kev sib xyaw ua ke, cov kev xav tau nruj dua tau muab tso rau pem hauv ntej rau cov khoom siv substrates thiab ntim khoom:
Raws li lub tshav kub tsim ntawm lub nti nce, siab dua thermal conductivity yuav tsum tau.
Nrog rau kev kub ceev ntawm lub tshuab xam zauv, qhov tsawg dielectric qhov yuav tsum tau.
Lub thermal expansion coefficient yuav tsum nyob ze rau silicon. Qhov no tso cov kev xav tau siab dua ntawm α-alumina, uas yog, nws txhim kho nyob rau hauv cov kev taw qhia ntawm siab purity thiab fineness.
3. High-pressure sodium teeb-emitting teeb
Ceramics zooua los ntawm high-purity ultrafine alumina raws li raw cov ntaub ntawv muaj cov yam ntxwv ntawm kub tsis kam, corrosion kuj, zoo rwb thaiv tsev, siab zog, thiab lwm yam., thiab yog ib tug zoo heev optical ceramic khoom. Pob tshab polycrystalline ua los ntawm high-purity alumina nrog ib tug me me ntawm magnesium oxide, iridium oxide los yog iridium oxide additives, thiab ua los ntawm huab cua sintering thiab kub nias sintering, tuaj yeem tiv taus corrosion ntawm high-temperature sodium vapor thiab siv tau raws li high-pressure sodium teeb-emitting teeb nrog lub teeb pom kev zoo.
Kev siv α-alumina hauv cov qauv ceramics
Raws li inorganic biomedical cov ntaub ntawv, cov ntaub ntawv bioceramic tsis muaj tshuaj lom phiv piv nrog cov ntaub ntawv hlau thiab cov ntaub ntawv polymer, thiab muaj biocompatibility zoo thiab corrosion kuj nrog cov ntaub so ntswg lom. Lawv tau nce nqi los ntawm tib neeg. Kev tshawb fawb thiab kev kho mob ntawm cov ntaub ntawv bioceramic tau tsim los ntawm kev hloov lub sij hawm luv luv thiab sau rau kev cog lus ruaj khov thiab ruaj khov, thiab los ntawm cov khoom siv tsis zoo rau cov khoom siv roj ntsha thiab cov khoom siv sib xyaw ua ke.
Nyob rau hauv xyoo tas los no, porousalumina ceramicstau siv los ua cov pob txha pob txha, pob txha pob txha, pob txha pob txha, pob txha pob txha, lwm cov pob txha pob txha, cov hniav cuav, cov pob txha kho pob txha, thiab kho pob txha vim lawv cov tshuaj tiv thaiv corrosion, hnav tsis kam, zoo kub stability, thiab thermoelectric zog. Txoj kev tswj cov pore loj thaum lub sij hawm npaj cov ntxeem tau alumina ceramics yog sib tov alumina hais ntawm txawv particle loj, ua npuas ncauj impregnate, thiab tshuaj tsuag kom qhuav cov khoom. Aluminium daim hlau kuj tseem tuaj yeem ua anodized los tsim cov kev taw qhia nano-scale microporous channel-hom pores.