1.Question: Dab tsi yog cov qauv txheej txheem rau ntsuas thermal thermal hauv aluminium alloy los xij?
Teb:
Thermal conductivity ntsuas ntawm aluminium alloy daim ntawv qhia raws peb txoj hauv paus tsev kawm ntawv. ASTM E1461 (Laser Flash Txuj Ci) yog tus qauv kub, siv cov pulsed laser cua sov kom ntsuas kev diffusity nrog}}} W \/ m} Almle Alloys. Iso 22007-2 (transient lub dav hlau) ua haujlwm ntsuas ntawm thermal conductivity, diffusivity, thiab cua sov tshwj xeeb. Rau cov chaw ib puag ncig, ovtm d593 {0 (hloov cov kab kev hloov pauv) Cov kev ua haujlwm niaj hnub tam sim no ua ke nrog cov thermography (ib qho ISO 18755) los qhia kev sib txawv ntawm cov chaw. Cov kev txhim kho tsis ntev los no suav nrog cov kev pabcuam waveforform tsis ntev los no los txheeb xyuas alloy inomogeneity hauv qab 0.5% kev hloov pauv hloov.
2.Nqe Lus Nug: Alloy muaj pes tsawg leeg cuam tshuam rau cov txheej txheem thermal ua haujlwm ntsuas?
Teb:
Cov ntsiab lus siv tau tas cov txheej txheej kev hloov kho vim lawv qhov kev pom zoo ntawm cov khoom siv thermal. Rau cov ascoa alloys (piv txwv li, 4xxx series yuav tsum nce ntxiv los ntawm 30% rau nyiaj rau qeeb qeeb thermal. Tooj liab-muaj alloys (2xxx series) yuav tsum muaj cov calorimetry (DSC) ua ntej mus kuaj rau theem theem nrab. Magnesium-nplua nuj alloys (5xxx series) thov inert gas ib puag ncig thaum kuaj kom tiv thaiv kev ua duab piv txwv. Qhov tseeb ovm e {1952-21 paub meej cov ntsiab lus zoo tshaj plaws los ntawm 8.2% thiab yuav tsum tau hloov kho cov tshuab laser flash. Kev lag luam lab tam sim no siv libs (laser-induced dov spectroscopy) rau kev ntsuas tiag tiag thaum lub sij hawm kuaj kev kuaj mob rau kev pib kho cov qauv.
3.Lus Nug: Dab tsi yog qhov kev txwv tseem ceeb rau kev coj ua kom tau txais kev xeem kom raug?
Teb:
Qauv Kev Npaj Rigor ncaj qha txiav txim siab ntsuas qhov siv tau. Cov ntawv txheeb yuav tsum tau txiav ntawm xaim EDM kom tiv thaiv kev ua haujlwm txias cuam tshuam rau cov npoo, nrog 50mm × 50 hli astm kev ua raws. Nto roughness yuav tsum yog<1.6μm Ra, achieved through diamond paste polishing followed by ultrasonic cleaning in acetone. For anisotropic alloys (like rolled 6xxx series), specimens must be marked with rolling direction and tested in 0°, 45°, and 90° orientations. Thickness measurements require micrometer verification at 9-point grids (±0.5μm repeatability). Modern protocols (per ISO 18753:2024) mandate 24-hour thermal equilibration at 23±0.1°C in desiccated chambers. Emerging best practices include plasma cleaning and ellipsometry verification of surface oxide layer uniformity (<50nm variation) before coating with graphite spray for laser flash tests.
4.Nqe Lus Nug: Cov kev ntsuas kub npaum li cas ntawm kev xaiv cov kev xaiv?
Teb:
Kev kub siab txog qhov kub thiab txias ranges tswj hwm cov txheej txheem kev xaiv. Rau cov ntawv thov cryogenic (-196 degree rau 25 degree), xav tau cov ntaub ntawv tiv thaiv cua sov muaj zog tshaj plaws, xav tau cov chav ua haujlwm tshwj xeeb tshaj plaws, xav tau cov haujlwm tshwj xeeb Mid-ntau qhov kub (25-300 degree) pub cov qauv sib piv siv cov qauv ntsuas hluav taws xob (nist srm 1450 series). Kev ntsuas kub (300-500 degree) tsim nyog hloov kho laser laser thiab dej-detected detectors kom tiv thaiv cov teeb liab. Tsis ntev los no 22007-4}}}}}} Txhua txoj hauv kev tam sim no xav tau kev siv tau los ntawm cov kev txheeb xyuas finite (fea) sim cov kev sim ua kom muaj cov kab cua sov sim hauv 5% sib txawv.
5.Nqe Lus Nug: Dab tsi yog qhov tawm los thev naus laus zis hloov kho thermal cermal kev cog lus?
Teb:
Peb txoj kev cuam tshuam txog cov thev naus laus zis yog hloov pauv txhuas alloy thermal me nyuam. Ua ntej, zaus-sau thermoreflectance (FDTTr) ua rau micria biret kev daws teeb meem classic nyob ze cov ciaj ciam av. Thib ob, quantum cascade laser-raws li qhov ua tiav 1 {{{}} nanoscale thenomena thenomena hauv alloys siab. Thib peb, hybrid system ua ke Terahertz lub sijhawm-sau spectroscopy nrog siv lub tshuab kev kawm tuaj yeem twv xyuas kev coj ua ntawm kev ntsuas ntawm kev tsis tuaj yeem. Qhov tseeb Astm WK78929 qauv sau sau cov qauv photorpler velocimetry los ntsuas cov cua thermal thermal hauv kev txav mus los nyob rau hauv cov ntawv txuas ntxiv. Cov kev hloov tshiab no pab 500% kev sim sai dua thaum txhim kho cov raug rau ± 0.8% - tseem ceeb rau kev ua haujlwm ntawm aerospace.
