1. Nā Kumu Huahana a me nā Pono Morphological
1.1 Ka Papahana Crystal a me ka Hana Kemika
(alumina pōʻai)
alumina pōʻai, a i ʻole ka poʻe ʻeleʻele alumini paona māmā (Al ₂ O ELIMA), he huahana seramika i hana ʻia e ka morphology globular i wehewehe maikaʻi ʻia a me kahi ʻano crystalline ka hapa nui o ka alpha. (a) pae.
Alpha-alumina, kekahi o ka polymorph paʻa thermodynamically, he papa hexagonal piha piha o nā ion oxygen me nā ion alumini e noho ana i ʻelua hapakolu o nā interstices octahedral., alakaʻi i ka ikehu latticework kiʻekiʻe a me ka inertness kemika kupaianaha.
Hōʻike kēia pae i ke kūpaʻa wela ʻokoʻa, ka mālama ʻana i ka ʻoiaʻiʻo e pili ana 1800 ° C, a kūʻē i ka pane me nā ʻakika, alkalis, a me nā kila hoʻoheheʻe ʻia ma lalo o nā pilikia ʻoihana he nui.
ʻAʻole like me nā pauka alumina maʻamau a angular paha i hoʻokumu ʻia mai ka calcination bauxite, Hoʻokumu ʻia ka alumina spherical ma o nā kaʻina hana wela kiʻekiʻe e like me ka plasma spheroidization a i ʻole ke ahi synthesis e hoʻokō ai i ka pōʻai like ʻole a me ke ʻano o ka ʻili..
ʻO ka hoʻololi ʻana mai nā bits precursor angular– maʻa mau ka bauxite a i ʻole gibbsite– i paapu, Hoʻopau nā pōʻai isotropic i nā ʻaoʻao ʻoi a me ka porosity o loko, ka hoʻonui ʻana i ka pono o ka hoʻopili ʻana a me ka paʻakikī mechanical.
ʻO nā ʻano maʻemaʻe kiʻekiʻe (≥ 99.5% Al Elua O ELIMA) He mea koʻikoʻi ia no nā noi uila a me semiconductor kahi e hoʻemi ʻia ai ka hoʻohaumia ionic.
1.2 ʻĀpana Geometry a me ke ʻano hoʻopili
ʻO ka hiʻohiʻona wehewehe o ka alumina poepoe ʻo ia kona sphericity kokoke loa, loiloi maʻamau e ka sphericity index > 0.9, ʻo ia ka mea e hoʻololi nui ai i kona kahe ʻana a me ka mānoanoa hoʻopili ʻana i nā ʻōnaehana composite.
E kūʻē i nā ʻāpana angular e hoʻopili a hoʻomohala i nā āpau, ʻO nā ʻāpana pōʻai e ʻōwili ʻia ma mua o kekahi me ka friction marginal, e ʻae ana i ka hoʻouka ʻana i nā mea paʻa kiʻekiʻe ma ke ʻano o nā huahana mea hoʻohana wela (Nā TIM), nā encapsulants, a me nā pūhui potting.
Hāʻawi kēia ʻano like ʻole geometric no ka ʻoi aku ka nui o nā density packaging academic 70 vol%, ʻoi aku ma mua o ka 50– 60 vol% maʻamau o nā mea hoʻopiha ʻole.
ʻO ka hoʻopihapiha hoʻopihapiha kiʻekiʻe e like me ka hoʻonui ʻia ʻana o ka thermal conductivity i nā matrices polymer, ʻoiai ke hāʻawi nei ka ʻupena seramika mau i nā ala lawe phonon hilinaʻi.
Kahi mea hou aʻe, ʻo ka ʻili maʻemaʻe e hōʻemi i ka ʻaʻahu ʻana i nā mea hana a hoʻemi i ka piʻi ʻana o ka mānoanoa i ka wā e hui pū ai, ka hoʻomaikaʻi ʻana i ke kaʻina hana a me ka palekana dispersion.
ʻO ke ʻano isotropic o nā pōʻai ke pale aku i ka anisotropy pili i ka hoʻonohonoho ʻana i nā waiwai noho wela a me nā mechanical., hōʻoiaʻiʻo i ka hana mau ma nā ʻaoʻao āpau.
2. ʻO nā ala Synthesis a me ka hōʻoia maikaʻi
2.1 Nā Hana Spheroidization Kiʻekiʻe
ʻO ka hana ʻana o ka alumina poepoe e hilinaʻi nui ʻia i nā ala wela e hoʻoheheʻe i nā ʻāpana alumina angular a hiki i ke koʻikoʻi o ka ʻili ke hoʻomaikaʻi iā lākou i loko o nā pōpō..
( alumina pōʻai)
ʻO ka plasma spheroidization kekahi o ka hoʻohana nui ʻia o ka ʻenehana kalepa, kahi i hoʻokomo ʻia ai ka pauka alumina i loko o ke ahi plasma wela wela (kokoke 10,000 K), e ho'āla ana i ka hoʻoheheʻe koke ʻana a me ka hoʻomāhuahua ʻana o ka ʻili i nā pōʻai maikaʻi loa.
Hoʻopaʻa koke nā kulu hoʻoheheʻe i ka holo ʻana, ulu mānoanoa, nā ʻāpana porous ʻole me ka hāʻawi ʻana i ka nui like ʻole ke hui pū ʻia me ka hoʻokaʻawale pololei.
Loaʻa nā ʻano hana like ʻole me ka spheroidization ahi me ka hoʻohana ʻana i nā kukui oxy-fuel a me ka hoʻomehana microwave-kōkua., ʻoiai hāʻawi kēia mau mea i ka haʻahaʻa haʻahaʻa a i ʻole ka mana liʻiliʻi ma luna o ka nui o nā ʻāpana.
He mea koʻikoʻi ka maʻemaʻe o ka huahana hoʻomaka a me ka holo ʻana o ka nui; ʻO nā submicron a i ʻole micron-scale precursors e hoʻopuka i nā pōpō nui like ma hope o ka lawelawe ʻana.
Ma hope o ka hoʻohuihui, hana ka huahana i ka kānana koʻikoʻi, ka wehe ʻana o ka electrostatic, a me ka loiloi diffraction laser no ka hoʻokaʻawale ʻana i kekahi ʻāpana ʻāpana (PSD), maʻa mau mai 1 i 50 µm ma muli o ka noi.
2.2 Hoʻololi i ka ʻili a me ka hoʻopili pono ʻana
E hoʻonui i ka hoʻohālikelike me nā matrices organik e like me silicones, nā epoxies, a me nā polyurethanes, Hoʻomaʻamaʻa mau ʻia ka alumina spherical me nā mea hoʻohui.
Nā mea hoʻohui Silane– e like me ka amino, epoxy, a i ʻole nā silanes palaki– hana i nā paʻa covalent me nā hui hydroxyl ma ka ʻili o ka alumina me ka hāʻawi ʻana i ka hana kūlohelohe e hui pū me ka polimer matrix..
Hoʻomaikaʻi kēia lāʻau lapaʻau i ka adhesion interfacial, hoʻohaʻahaʻa i ka pale ʻana i ka wela hoʻopihapiha-matrix, a pale i ka huikau, e hoʻonui i nā pūhui like ʻole me ka hana mechanical a me ka wela.
Hiki ke hana ʻia ka hoʻopau ʻana o ka ʻili e hōʻike i ka hydrophobicity, hoʻonui i ka hoʻopuehu ʻana i nā mea nonpolar, a i ʻole hiki ke hana i nā hana hoʻoulu ʻia i nā mea wela akamai.
ʻO ka hōʻoia o ka maikaʻi he mau ana o ka ʻili BET, mānoanoa pā, ka hoʻoheheʻe wela (maʻamau 25– 35 W/(m · K )no ka α-alumina mānoanoa), a me ka hoʻopili ʻana i ka haumia ma o ICP-MS e kāpae i ka Fe, Ua hala, a me K ma nā pae ppm.
He mea koʻikoʻi ka hoʻohui like ʻana o ka Batch-to-batch no nā noi hilinaʻi kiʻekiʻe i ka uila a me ka aerospace.
3. Hana wela a me ka Mechanical i nā Composite
3.1 ʻEnekinia Mea hoʻohana i ka ʻenekinia
Hoʻohana nui ʻia ka alumina round ma ke ʻano he hoʻopihapiha hoʻopihapiha kiʻekiʻe e hoʻomaikaʻi i ka conductivity thermal o nā mea i hoʻokumu ʻia polymer i hoʻohana ʻia i loko o ka ʻeke huahana uila., Hoʻomālamalama LED, a me nā modula mana.
ʻOiai ʻo ka epoxy maʻemaʻe a i ʻole silicone he conductivity thermal o ~ 0.2 W/(m · K), hoʻopaʻa ʻia me 60– 70 Hiki i ka vol% round alumina ke hoʻonui i kēia i 2– 5 W/(m · K), lawa no ka hoopau pumehana maikai i na mea paahana.
ʻO ke kiʻekiʻe o ka thermal conductivity o α-alumina, hoʻohui pū ʻia me ka puʻupuʻu liʻiliʻi e laha ana ma nā pilina paheʻe ʻāpana-particle a me nā ʻāpana-matrix, hiki ke hoʻololi i ka wela me nā pūnaewele percolation.
Ke kū'ē wela wela (Kapitza kū'ē) ke hoʻomau nei i kahi ʻano palena, ʻO ka hoʻohana ʻana i ka ʻili a me nā hoʻolālā dispersion i hoʻonui ʻia e kōkua i ka hōʻemi ʻana i kēia pilikia.
I nā huahana interface thermal (Nā TIM), ʻO ka alumina spherical e hoʻemi ana i ke kūʻē kelepona ma waena o nā ʻāpana hana wela (e.g., PPU, Nā IGBT) a poho ka mehana, hooki i ka wela nui a hoʻonui i ke ola o ka mea hana.
ʻO kona hoʻokuʻu uila (hoʻopaʻapaʻa > 10 ¹² Ω · kenimika) hōʻoia i ka palekana a me ka palekana i nā noi kiʻekiʻe-voltage, ka hoʻokaʻawale ʻana mai nā mea hoʻopiha conductive e like me ke kila a i ʻole graphite.
3.2 Paʻa Mechanical a me ka hilinaʻi
Ma waho aʻe o ka hana wela, ʻO ka alumina puni e hoʻomaikaʻi i ka ikaika mechanical o nā pūhui ma o ka hoʻonui ʻana i ka paʻa, modulus, a me ke kūlana paʻa.
Hāʻawi like ke ʻano poepoe i ke kaumaha a me ka hopohopo, e ho'ēmi ana i ka hoʻomaka ʻana a me ka hoʻonui ʻana ma lalo o ke kaʻa kaʻa wela a i ʻole ka ukana mechanical.
He mea koʻikoʻi kēia i nā huahana underfill a me nā encapsulants no nā hāmeʻa flip-chip a me 3D-packaged., kahi coefficient o ka ulu ana wela (CTE) hiki i ka like ʻole ke hoʻoulu i ka delamination.
Ma ka hoʻoponopono hou ʻana i ka hoʻouka ʻana i ka mea hoʻopihapiha a me ka puʻunaue ʻana i ka nui bit (e.g., huila bimodal), Hiki ke hoʻokani ʻia ka CTE o ka composite e like me ka silikoni a i ʻole ka motherboard i paʻi ʻia, e ho'ēmi ana i ka pilikia thermo-mechanical a me ka hopohopo.
Eia kekahi, ʻO ka inertness kemika o ka alumina e pale aku i ka hoʻohaʻahaʻa ʻana i loko o nā ea hau a i ʻole nā corrosive, e hōʻoiaʻiʻo ana i ka hilinaʻi mau loa ma ke kaʻa, kalepa, a me nā mea uila waho.
4. Nā noi a me ka hoʻomohala ʻenehana
4.1 Nā Mea Hana Uila a me nā Haʻina Kaʻa Uila
He mea koʻikoʻi ka alumina pōʻai i ka hoʻokele wela o nā uila mana kiʻekiʻe, me nā transistors bipolar puka pale (Nā IGBT), mea mana, a me nā ʻōnaehana hoʻokele pila ma nā kaʻa uila (Nā EV).
I nā haʻawina EV, ua hoʻohui ʻia i loko o nā mea kanu a me nā huahana hoʻololi i ke kahua e pale i ka holo ʻana i ka wela ma o ka hāʻawi like ʻana i ka mahana ma nā cell..
Hoʻohana nā mea hana LED iā ia i nā encapsulants a me nā optics lua e mālama i ka hopena lumen a me ka pale ʻana i ka like ʻana ma o ka hoʻemi ʻana i ka mahana hui..
I loko o ka 5G framework a me nā wahi ʻike, kahi e piʻi ana nā mānoanoa hoʻololi mahana, ʻO nā TIM piha piha i ka alumina spherical e hana i kekahi kaʻina hana paʻa o nā ʻāpana kiʻekiʻe a me nā diodes laser..
Ke hoʻonui nei kāna hana i nā ʻenehana hōkeo huahana hou e like me ka fan-out wafer-level packaging (FOWLP) a me nā ʻōnaehana make i hoʻokomo ʻia.
4.2 Nā Kūlana Kūlana a me ka hoʻomohala mau
Hoʻopili ka ulu ʻana o ka wā e hiki mai ana i nā ʻōnaehana hoʻopihapiha hybrid e hoʻohui ana i ka alumina puni me ka boron nitride, alumini nitride, a i ʻole graphene no ka hoʻokō ʻana i ka hana wela me ka mālama ʻana i ka insulation uila.
Nano-spherical alumina (lalo-100 nm) ke ʻimi ʻia nei no nā seramika alohilohi, Nā uhi UV, a me nā noi biomedical, ʻoiai he mau pilikia i ka hoʻopuehu ʻana a me ke kumukūʻai noho.
ʻO ka hana hoʻohui o nā mea hoʻohui polymer thermally conductive me ka hoʻohana ʻana i ka alumina spherical hiki ke paʻakikī, topology-optimized pumehana dissipation frameworks.
Hoʻokomo ʻia nā hana hoʻomau hoʻomau i nā kaʻina hana spheroidization e pono ai ka ikehu, hana hou ʻana i nā mea ʻokoʻa, a me ka nānā 'ana i ka pō'ai ola e hō'emi i ka hopena kalapona o nā mea wela ki'eki'e.
Ma ka hōʻuluʻulu, ʻO ka alumina poepoe he mea nui i hana ʻia ma ka hui ʻana o nā porcelains, pūhui, a me ka ʻepekema wela.
ʻO kāna hui kūikawā o morphology, ka maemae, a ʻo ka hana ka mea nui i ka miniaturization mau a me ka hoʻonui ʻana i ka mana o nā ʻōnaehana kamepiula a me nā mana.
5. Mea hoʻolako
ʻO TRUNNANO kahi mea hana Spherical alumina i ʻike ʻia a me ka mea hoʻolako i nā pūhui me nā mea ʻoi aku 12 makahiki o ka ʻike i nā nanomaterial kiʻekiʻe loa a me nā mea kemika ʻē aʻe. Hoʻomohala ka hui i nā ʻano mea pauda a me nā kemika. Hāʻawi i ka lawelawe OEM. Inā makemake ʻoe i ka alumina Spherical kiʻekiʻe, e ʻoluʻolu e hoʻokaʻaʻike mai iā mākou. Hiki iā ʻoe ke kaomi i ka huahana e hoʻokaʻaʻike mai iā mākou.
Nā huaʻōlelo: alumina pōʻai, alumina, alumini oxide
ʻO nā ʻatikala a me nā kiʻi a pau mai ka Pūnaewele. Inā loaʻa kekahi pilikia kope, e ʻoluʻolu e kelepona mai iā mākou i ka manawa e holoi ai.
E nīnau iā mākou