Ib qho ntawm cov khoom tseem ceeb ntawm pob tshab ceramics yog nws cov transmittance. Thaum lub teeb dhau los ntawm qhov nruab nrab, lub teeb poob thiab kev siv zog attenuation yuav tshwm sim vim qhov nqus, qhov cuam tshuam ntawm qhov chaw, tawg thiab tawg ntawm qhov nruab nrab. Cov attenuations nyob ntawm tsis yog tsuas yog nyob rau hauv cov tshuaj lom neeg muaj pes tsawg leeg ntawm cov khoom, tab sis kuj nyob rau hauv lub microstructure ntawm cov khoom. Cov yam cuam tshuam rau kev xa tawm ntawm ceramics yuav qhia hauv qab no.
1.Porosity ntawm ceramics
Kev npaj ntawm pob tshab ceramics yog qhov tseem ceeb los tshem tawm qhov ntom ntom ntawm micro-pore tag nrho hauv cov txheej txheem sintering. Qhov loj, tus naj npawb thiab hom pore hauv cov ntaub ntawv yuav muaj kev cuam tshuam loj rau cov pob tshab ntawm cov khoom siv ceramic. Cov kev hloov me me ntawm cov porosity tuaj yeem hloov pauv cov khoom xa tuaj. Piv txwv li, cov kev tshawb fawb tau pom tias pob tshab txo los ntawm 33% thaum lub kaw porosity hauv ceramics hloov ntawm 0.25% mus rau 0.85%. Txawm hais tias qhov no yuav yog qhov tshwm sim ntawm ib qho xwm txheej, rau qee qhov, peb tuaj yeem pom tias cov txiaj ntsig ntawm porosity ntawm pob tshab ntawm ceramics yog qhov ncaj qha thiab ua phem tshwm sim. Lwm cov ntaub ntawv tshawb fawb qhia tau hais tias thaum lub plab ntim yog 3%, qhov kev xa tawm yog 0.01%, thiab thaum lub plab ntim yog 0.3%, qhov kev xa tawm yog 10%. Yog li ntawd, pob tshab ceramics yuav tsum nce lawv qhov ntom thiab txo lawv cov porosity, uas feem ntau yog ntau tshaj 99.9%. Dhau li ntawm qhov porosity, txoj kab uas hla ntawm lub pore kuj muaj kev cuam tshuam zoo rau kev xa tawm ntawm ceramics. Raws li pom hauv daim duab hauv qab no, peb tuaj yeem pom tias qhov kev xa tawm yog qhov qis tshaj plaws thaum lub cheeb ntawm lub stomata yog sib npaug rau lub wavelength ntawm qhov teeb meem teeb meem.
2. Cov qoob loo loj
Lub grain loj ntawm ceramic polycrystals kuj muaj kev cuam tshuam zoo rau kev xa tawm ntawm pob tshab ceramics. Thaum qhov teeb meem lub teeb wavelength yog sib npaug ntawm cov kab uas hla, qhov tawg ntawm lub teeb yog qhov loj tshaj plaws thiab qhov transmittance yog qhov qis tshaj. Yog li ntawd, txhawm rau txhawm rau txhim kho kev xa tawm ntawm pob tshab ceramics, cov nplej loj yuav tsum tau tswj xyuas sab nraum lub wavelength ntawm qhov teeb meem teeb meem.
3. Cov qoob loo ciam teb
Cov ciam teb nplej yog ib qho tseem ceeb uas cuam tshuam qhov kev sib haum xeeb ntawm cov khoom siv hluav taws xob thiab ua rau lub teeb tawg thiab txo cov khoom xa mus. Cov theem muaj pes tsawg leeg ntawm cov ntaub ntawv ceramic feem ntau muaj ob lossis ntau theem, uas tuaj yeem yooj yim ua rau lub teeb tawg ntawm qhov chaw ciam teb. Qhov ntau dua qhov sib txawv ntawm cov ntaub ntawv, qhov ntau dua qhov sib txawv ntawm qhov refractive index, thiab qhov qis dua qhov xa tawm ntawm tag nrho cov ceramics. Yog li ntawd, cov qoob loo ciam teb ntawm pob tshab ceramics yuav tsum nyias nyias, lub teeb sib txuam yog qhov zoo, thiab tsis muaj qhov pores. , inclusions, dislocations thiab lwm yam. Cov ntaub ntawv ceramic nrog cov khoom siv isotropic tuaj yeem ua tiav cov kab xa tawm zoo ib yam li cov iav.
4. Nto tiav
Lub transmittance ntawm pob tshab ceramics kuj cuam tshuam los ntawm nto roughness. Lub roughness ntawm ceramic nto yog txuam tsis tau tsuas yog rau cov fineness ntawm raw cov ntaub ntawv, tab sis kuj mus rau lub machined tiav ntawm ceramic nto. Tom qab sintering, qhov saum npoo ntawm cov ceramics tsis kho muaj qhov loj roughness, thiab diffuse reflection yuav tshwm sim thaum lub teeb tshwm sim ntawm qhov chaw, uas yuav ua rau lub teeb poob. Qhov ntau dua qhov roughness ntawm qhov chaw, qhov kis tau zoo dua.
Qhov saum npoo roughness ntawm ceramics muaj feem xyuam rau qhov zoo ntawm cov khoom siv raw. Ntxiv nrog rau kev xaiv cov khoom siv raw khoom zoo, qhov saum npoo ntawm ceramics yuav tsum yog hauv av thiab polished. Kev xa tawm ntawm alumina pob tshab ceramics tuaj yeem txhim kho tau zoo los ntawm kev sib tsoo thiab polishing. Kev xa tawm ntawm alumina pob tshab ceramics tom qab sib tsoo feem ntau tuaj yeem nce ntawm 40% -45% mus rau 50% -60%, thiab polishing tuaj yeem ncav cuag ntau dua 80%.
Post lub sij hawm: Nov-18-2019