1. Product Basics uye Morphological Advantages
1.1 Crystal Framework uye Chemical Mamiriro
(Spherical alumina)
Spherical alumina, kana kutenderera chiedza uremu aluminium oxide (Al ₂ O ZVISHANU), chigadzirwa chakagadzirwa checeramic chinoratidzwa neinonyatsotsanangurwa globular morphology uye chimiro checrystalline kazhinji mualpha. (a) phase.
Alpha-alumina, imwe yeiyo yakanyanya thermodynamically yakagadzikana polymorph, inosanganisira hexagonal yakavharwa-yakazara chirongwa cheokisijeni ion ine aruminiyamu ion inogara zvikamu zviviri muzvitatu zveoctahedral interstices., inotungamira kune yakakwira latticework simba uye inoshamisa makemikari inertness.
Iyi nhanho inoratidza kugadzikana kwekushisa kwakasiyana, kuchengetedza kuvimbika zvinenge 1800 °C, uye inoramba mhinduro nemaasidhi, alkalis, uye simbi dzakanyungudutswa pasi pematambudziko mazhinji emaindasitiri.
Kusiyana neasina kujairika kana angular alumina poda yakabva kune bauxite calcination, spherical alumina inogadzirwa kuburikidza nepamusoro-tembiricha maitiro senge plasma spheroidization kana murazvo synthesis kuita kutenderera kunoenderana uye yakatsetseka pamusoro pechimiro..
Shanduko kubva kune angular precursor bits– kazhinji calcined bauxite kana gibbsite– to dense, isotropic rounds inobvisa mativi akapinza uye mukati porosity, kuwedzera kurongedza kushanda uye kuoma kwemakanika.
High-kuchena unhu (≥ 99.5% Al Vaviri O Vshanu) kwakakosha kune zvemagetsi uye semiconductor kunyorera uko kusvibiswa kweionic kunofanirwa kudzikiswa.
1.2 Particle Geometry uye Packing Behaviour
Iyo inotsanangura hunhu hwekutenderera alumina ndiyo iri pedyo-yakakwana sphericity, kazhinji inoongororwa ne sphericity index > 0.9, iyo inokanganisa zvakanyanya kuyerera kwayo uye kurongedza ukobvu mumasisitimu anoumbwa.
Kusiyana nezvidimbu zveangular zvinopindirana uye kukudziridza mapeji, zvimedu zvakatendereka zvinokunguruka zvakapfuura mumwe nemumwe nekukwesha kwepamucheto, kubvumira zvakaomesesa kurodha mukati mefomula yezvinopisa mushandisi interface zvigadzirwa (TIMs), encapsulants, uye potting compounds.
Kufanana kwejometri uku kunobvumira dhizaini yekurongedza yedzidzo inodarika 70 vol%, kupfuura 50– 60 vol% yakajairika yezvisina kujairika mafirita.
Yepamusoro kuzadza kuzadza kwakatwasuka kwakaenzana nekusimudzira kupisa conductivity mumapolymer matrices, sezvo inogara ceramic network inopa yakavimbika phonon yekufambisa nzira.
Pamusoro pe, iyo yakatsetseka pamusoro penzvimbo inoderedza kusakara pamaturusi ekubata uye inoderedza ukobvu kukwira panguva yekusanganiswa, kuvandudza processability uye kupararira kuchengetedzwa.
Iyo isotropic chimiro chekutenderera zvakare inodzivirira kutarisisa-inotsamira anisotropy mukupisa uye mechaniki yekugara zvivakwa., kuvimbisa kuita nguva dzose mumativi ese.
2. Synthesis Nzira uye Kuvimbiswa Kwemhando
2.1 High-Temperature Spheroidization Nzira
Kugadzirwa kwealumina yakatenderedza kunonyanya kutsamira panzira dzinopisa dzinonyungudutsa angular alumina zvimedu uye inogonesa kushushikana kwenzvimbo yekuvavandudza kuita mabhora..
( Spherical alumina)
Plasma spheroidization ndeimwe yeanonyanya kushandiswa kushandiswa kwehunyanzvi hwekutengesa, uko alumina poda inopinzwa mumoto unopisa weplasma (anenge 10,000 K), kukonzeresa kunyungudika nekukasira uye pamusoro penzvimbo tension-driven densification kusvika mumaraundi akanakisa.
Madonhwe akanyunguduka anokurumidza kusimba mukubhururuka, kukura gobvu, zvisiri-porous particles ane yunifomu saizi kugovera kana yabatanidzwa nechaiyo classification.
Nzira dzakasiyana dzinosanganisira moto spheroidization uchishandisa oxy-fuel lanterns uye microwave-inobatsira kupisa., kunyangwe izvi zvinowanzopa yakaderera throughput kana kuderera kudzora pane particle size.
Iyo yekutanga chigadzirwa kuchena uye chidimbu dimension kutenderera kwakakosha; submicron kana micron-scale precursors inogadzirawo saizi mabhora mushure mekubata.
Post-synthesis, chigadzirwa chinoita strenuous sieving, electrostatic kupatsanurwa, uye Laser diffraction ongororo kuita mamwe mashoma madiki dimension kugovera (PSD), kazhinji kubva 1 ku 50 µm zvichienderana nekushandiswa.
2.2 Surface Kugadziriswa uye Inoshanda Kugadzirisa
Kuti uwedzere kuenderana nema organic matrices senge silicones, epoxies, uye polyurethanes, spherical alumina inowanzobatwa pamusoro-soro nemibatanidzwa yekubatanidza.
Silane coupling agents– zvakadai seamino, epoxy, kana mapurasitiki anoshanda silanes– gadzira covalent zvisungo ne hydroxyl zvikwata panzvimbo yealumina pamusoro apa uchipa organic performance inobata ne polymer matrix..
Mushonga uyu unonatsiridza kubatanidza kumeso, inoderedza filler-matrix thermal resistance, uye inodzivirira jumble, zvichiita kuti mamwe mayunifomu asanganisike ane yepamusoro mechanical uye thermal performance.
Kupedzisa kwenzvimbo yepamusoro kunogona zvakare kugadzirwa kuratidza hydrophobicity, kuwedzera kupararira mune nonpolar zvinhu, kana kuita kuti zvikwanisike kune zvinokurudzira-zvinopindura maitiro mune zvakangwara zvinopisa zvinhu.
Kuvimbiswa kwehutano kunosanganisira zviyero zveBET pamusoro, pombi ukobvu, thermal conductivity (kazhinji 25– 35 W/(m · K )kune gobvu α-alumina), uye kusachena profiling kuburikidza neICP-MS kusabvisa Fe, Kare, uye K pa ppm mazinga.
Batch-to-batch kufanana kwakakosha kune yakakwirira-kuvimbika maapplication mumagetsi uye aerospace.
3. Thermal uye Mechanical Performance muComposites
3.1 Thermal Conductivity uye Mushandisi Interface Injiniya
Round alumina inonyanya kushandiswa seyepamusoro-inoshanda kuzadza kusimudzira kupisa kwemafuta epolymer-yakavakirwa zvinhu zvinoshandiswa mumagetsi chigadzirwa kurongedza., Kuvhenekera kwe LED, uye simba modules.
Nepo yakachena epoxy kana silicone ine yekupisa conductivity ye ~ 0.2 W/(m · K), kurongedza ne60– 70 vol% kutenderera alumina inogona kuwedzera izvi kusvika ku2– 5 W/(m · K), zvakakwana kuti inobudirira kudziya kuparara mune compact maturusi.
Iyo yakakwira inherent thermal conductivity yea-alumina, inosanganisirwa neidiki kwazvo phonon inopararira pane yakatsetseka particle-particle uye particle-matrix interfaces, inoita kuti zvikwanise kufambisa kupisa kwakavimbika ne percolation network.
Interfacial thermal resistance (Kapitza resistance) inoramba iri chinhu chinoganhurira, asi mashandiro epamusoro uye nzira dzakasimudzirwa dzekuparadzira dzinobatsira kudzikisira chipingamupinyi ichi.
Mune thermal interface zvigadzirwa (TIMs), spherical alumina inoderedza kupikisa kufona pakati pezvikamu zvinogadzira kupisa (e.g., CPUs, IGBTs) uye kudziya kunonyura, kumisa kupisa uye kuwedzera hupenyu hwechigadzirwa.
Kuvhara kwayo magetsi (resistivity > 10 ¹² Ω · masendimita) inochengetedza kuchengetedzwa uye kuchengetedzeka mune yakakwira-voltage application, kuisiyanisa kubva kune conductive fillers sesimbi kana graphite.
3.2 Mechanical Kugadzikana uye Kuvimbika
Beyond thermal performance, round alumina inovandudza kusimba kwemakanika kwemakomponi nekuwedzera kusimba, modulus, uye dimensional kugadzikana.
Chimiro chakatenderedza chinogovera kushushikana uye kusagadzikana zvakaenzana, kuderedza kupatsanurwa kutanga uye kupararira pasi pekupisa bhasikoro kana mechanical load.
Izvi zvakanyanya kukosha mune underfill zvigadzirwa uye encapsulants yeflip-chip uye 3D-yakarongedza zvishandiso., uko coefficient of thermal development (CTE) kusaenzana kunogona kukonzera delamination.
Nekugadzirisa kurodha kwekuzadza uye kugovera saizi diki (e.g., bimodal blends), iyo CTE yemusanganiswa inogona kugadziridzwa kuti ienderane neyesilicon kana yakadhindwa mamaboard, kuderedza thermo-mechanical stress uye kuzvidya mwoyo.
Uyezve, iyo kemikari inertness yealumina inodzivirira kushatiswa mumhepo ine hunyoro kana inopisa, kuvimbisa kuvimbika kunogara mune auto, commercial, uye zvemagetsi zvekunze.
4. Applications uye Technical Evolution
4.1 Electronic Devices uye Electric Automobile Solutions
Round alumina chinhu chakakosha chinogonesa mukudziya kwekutonga kwepamusoro-simba zvemagetsi, kusanganisira yakachengetedzwa gedhi bipolar transistors (IGBTs), zvinhu zvemagetsi, uye mabhatiri ekutonga masisitimu mumarori emagetsi (EVs).
MuEV mabhatiri anoremerwa, inosanganisirwa mumidziyo yekubikira uye zvigadzirwa zvekuchinja nhanho kudzivirira kupisa kunotiza nekugovera zvakafanana kudziya mukati memasero..
Vagadziri ve LED vanoishandisa mune encapsulants uye yechipiri optics kuchengetedza lumen mhedzisiro uye mumvuri kufanana nekuderedza kupisa kwemajoini..
Mune 5G chimiro uye zvivako zvemashoko, uko kunodziya kuchinja densities ari kukwira, spherical alumina-akazadzwa maTIM anoita imwe yakagadzikana maitiro epamusoro-frequency machipisi uye laser diodes..
Basa rayo riri kukura kuita hunyanzvi hwekurongedza zvigadzirwa senge fan-out wafer-level packaging. (FOWLP) uye embedded die systems.
4.2 Arising Frontiers uye Inogara Kubudirira
Kukura kweramangwana kunotarisa pane hybrid filler masisitimu anobatanidza akatenderedza alumina ne boron nitride, aluminium nitride, kana graphene kuti iwane kushandirapamwe kupisa kwekuita uchichengeta kuvharirwa kwemagetsi.
Nano-spherical alumina (pasi-100 nm) iri kuongororwa zviumbwa zvedhakara zvinoonekera, UV zvivharo, uye biomedical application, kunyangwe zvipingamupinyi mukupararira uye mutengo unogara.
Kuwedzera kugadzirwa kwe thermally conductive polymer composites ichishandisa spherical alumina inobvumira kuomarara., topology-optimized warm dissipation frameworks.
Sustainability kuedza kunosanganisira simba-inoshanda spheroidization maitiro, kudzokororwa kwezvinhu zvisiri-spec, uye kuongorora kwehupenyu-kutenderera kuderedza kabhoni kukanganisa kwepamusoro-kushanda kwemafuta ekupisa.
Muchidimbu, round alumina inomiririra yakakosha kugadzirwa zvinhu panosangana maporcelains, makemikari, uye thermal science.
Kusanganiswa kwayo kwakakosha kwemorphology, kuchena, uye kuita kunoita kuti ive yakakosha mukuenderera mberi miniaturization uye kuwedzera kwesimba kweazvino dhijitari nemagetsi masisitimu.
5. Provider
TRUNNANO inozivikanwa pasi rose Spherical alumina inogadzira uye mutengesi wemakomponi ane zvinopfuura. 12 makore ehunyanzvi mumhando yepamusoro nanomaterials nemamwe makemikari. Iyo kambani inogadzira zvakasiyana-siyana zvehupfu zvinhu uye makemikari. Ipa OEM sevhisi. Kana iwe uchida yemhando yepamusoro Spherical alumina, ndapota inzwa wakasununguka kutibata nesu. Unogona kudzvanya pachigadzirwa kuti ubate nesu.
Tags: Spherical alumina, alumina, aluminium oxide
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