1. Nā Kumu Huahana a me nā Pono Crystallographic
1.1 Ka Papa Hana a me ka Polymorphic Behavior
(Palaka Alumina Ceramic)
alumina (Al ₂ O ELUA), kikoʻī i kona ʻano α-phase, ʻo ia kekahi o nā porcelains ʻenehana i hoʻohana pinepine ʻia ma muli o kona koena kūʻokoʻa o ka ikaika mechanical., kemika inertness, a me ka palekana wela.
ʻOiai aia ka alumini oxide i kekahi mau pae metastable (c, d, i, Ua haʻi aku ʻo Mr), ʻO ka α-alumina ka hoʻoheheʻe kristal paʻa mau i ka wela, ʻike ʻia e kahi hexagonal paʻa paʻa (HCP) ka hoʻolālā o nā ion oxygen me nā kaona alumini e noho ana i ʻelua hapakolu o nā wahi interstitial octahedral..
Ua kūʻai ʻia kēia ʻano hana, ʻike ʻia he daimana, hāʻawi i ka ikehu lattice kiʻekiʻe a me ka paʻa paʻa ionic-covalent, e hoʻoheheʻe ʻia ana 2054 ° C a me ka pale ʻana i ka hoʻomaikaʻi ʻana i ka pae ma lalo o nā pilikia wela.
ʻO ka hoʻololi ʻana mai nā alumina hoʻololi a hiki i ka α-Al ₂ O ʻelua ke hana maʻamau 1100 ° C a hui pū ʻia me ka emi ʻana o ka nui a me ka nalowale o ka ʻili, hana i ka mana o ka pae i mea ko'iko'i i ka wā o ka sintering.
Nā poloka α-alumina maʻemaʻe kiʻekiʻe (> 99.5% Al ₂ O ₃) hōʻike i ka maikaʻi kupaianaha i nā hoʻonohonoho koʻikoʻi, ʻoiai nā hale papa haʻahaʻa (90– 95%) hiki ke komo i nā ʻāpana lua e like me ka mullite a i ʻole nā ʻāpana kīʻaha aniani no nā noi kūpono.
1.2 Microstructure a me Mechanical Honesty
Hoʻopili nui ʻia ka maikaʻi o nā poloka seramika alumina e nā hiʻohiʻona microstructural me ka nui o ka palaoa, pōʻalo, a me ka huikau palena palaoa.
Nā microstructure maikaʻi (ka nui o ka palaoa < 5 µm) normally provide greater flexural strength (as much as 400 MPa) and improved fracture toughness contrasted to grainy counterparts, as smaller grains hinder fracture propagation.
Porosity, ʻoiai ma nā pae haʻahaʻa (1– 5%), hoemi loa i ka ikaika mechanical a me ka wela, e koi ana i ka densification piha ma o ke kaomi-kōkua sintering e like me ka pumehana kaomi a me ka wela isostatic kaomi. (HIP).
Hoʻokomo pinepine ʻia nā mea hoʻohui e like me MgO i nā ʻano nui (≈ 0.1 wt%) e pale i ka ulu ʻana o ka palaoa i ka wā o ka sintering, e hōʻoia i ka microstructure kūlike a me ke kūpaʻa dimensional.
Hōʻike nā poloka seramika i ka paʻakikī kiʻekiʻe (≈ 1800 HV), kūʻē maikaʻi loa, a ho'ēmi i ka nui o nā kolo i nā pae wela kiʻekiʻe, kūpono ia no ka halihali ukana a me ka ʻino.
2. Nā Hana Hana Hana
( Palaka Alumina Ceramic)
2.1 Pauda Prep Work and Shaping Methods
Hoʻomaka ka hana ʻana i nā poloka alumina ceramic me nā pauka alumina maʻemaʻe kiʻekiʻe i hoʻokumu ʻia mai ka bauxite calcined ma o ke kaʻina Bayer a i hana ʻia me ka ua a i ʻole nā ala sol-gel no ka maʻemaʻe kiʻekiʻe..
Hoʻopili ʻia nā pauka i mea e loaʻa ai ka puʻunaue liʻiliʻi, ka hoʻonui ʻana i ka nui o ka packing a me ka sinterability.
Hoʻopau ʻia ka hana ʻana i nā geometries kokoke-net me nā hoʻolālā hoʻomohala like ʻole: kaomi uniaxial no nā poloka pololei, kaomi isostatic no ka paʻa like ʻole i nā ʻano paʻakikī, extrusion no nā wahi lōʻihi, a me ka hoʻolei ʻana i ka paheʻe no nā ʻāpana paʻakikī a nui paha.
Hoʻopili kēlā me kēia ʻenehana i ka nui o ke kino ʻōmaʻomaʻo a me ka homogeneity, ʻO ia ka hopena pololei o nā hale noho hope ma hope o ka sintering.
No nā noi hana kiʻekiʻe, Hiki ke hoʻohana ʻia ka hana kiʻekiʻe e like me ka hoʻolele lipine a i ʻole ka hoʻolei ʻana i ka gel e hoʻokō ai i ka mana premium dimensional a me ka microstructural harmony..
2.2 Sintering a me ka hoʻoponopono hope
Sintering i ka ea ma nā pae wela ma waena 1600 ° C a 1750 Hāʻawi ʻo ° C i ka diffusion-driven densification, kahi e ulu ai nā ʻāʻī ʻāʻī a emi nā pores, ke kumu o ke kino seramika mānoanoa loa.
He mea nui ka hoʻomalu ʻana i ka ʻoluʻolu a me nā ʻaoʻao wela pololei e pale aku i ka bloating, hoʻopaʻapaʻa, a i ʻole ka ʻokoʻa ʻokoʻa.
ʻO nā kaʻina hana post-sintering ʻo ia ka wili daimana, hili ana, a me ka polishing no ka hoʻokō ʻana i nā hoʻomanawanui paʻa a me nā uhi ʻili maʻemaʻe i koi ʻia no ka hoʻopaʻa ʻana, e holo ana, a i ʻole nā noi optical.
ʻO ka hoʻemi ʻana i ka laser a me ka mīkini wai wai e ʻae i ka hoʻopilikino pono ʻana o ka geometry poloka me ka ʻole o ka hoʻoluhi wela a me ka hopohopo.
Hiki i nā hoʻomaʻamaʻa ʻili e like me ka uhi alumina a i ʻole ka plasma splashing hiki ke hoʻonui i ka ʻaʻahu a i ʻole ke kūpaʻa corrosion i nā kūlana lawelawe kūikawā..
3. Pono pono a me nā ana hana
3.1 ʻO nā maʻa wela a me ka uila
Hōʻike nā poloka seramika alumina i ka hana wela haʻahaʻa (20– 35 W/(m · K)), ʻoi aku ka kiʻekiʻe ma mua o nā polymers a me nā aniani, e hiki ai i ka hoʻoheheʻe wela hilinaʻi i nā ʻōnaehana hoʻokele uila a me ka wela.
Mālama lākou i ka ʻoiaʻiʻo e like me 1600 ° C i loko o ka oxidizing ambiences, me ka ulu wela haʻahaʻa (≈ 8 ppm/K), e hoʻohui i ke kūpaʻa haʻalulu wela maikaʻi loa ke kūkulu pono ʻia.
ʻO kā lākou resistivity uila kiʻekiʻe (> 10 ¹⁴ Ω · knm) a me ka ikaika dielectric (> 15 kV/mm) e hoʻolilo iā lākou i mau insulators uila maikaʻi i nā hoʻonohonoho kiʻekiʻe-volt, ʻo ia ka hoʻoili mana, mea hoʻololi, a me nā ʻōnaehana vacuum.
Dielectric kūlike (εᵣ ≈ 9– 10) paʻa mau ma luna o kahi ʻano maʻamau nui, hoʻomau i ka hoʻohana ʻana i nā noi RF a me ka microwave.
Hāʻawi kēia mau hale i nā poloka alumina e hana hilinaʻi ma nā wahi kahi e hoʻohaʻahaʻa ai ʻole nā huahana kūlohelohe.
3.2 ʻO ke Kemika a me ke Kaiaola
ʻO kekahi o nā hiʻohiʻona maikaʻi loa o nā poloka alumina ʻo ko lākou kūʻē kūʻokoʻa i ka hahau kemika.
ʻAʻole paʻa loa lākou i nā waikawa (ʻē aʻe ma waho o ka waika hydrofluoric a me ka phosphoric mahana), alkalis (me kekahi mea hoʻoheheʻe i loko o ka caustics ikaika i nā wela kiʻekiʻe), a me na paakai hehee, hoʻolilo iā lākou i mea kūpono no ka hana kemika, hana semiconductor, a me nā mea hoʻomalu haumia.
ʻO kā lākou hana hoʻomaʻemaʻe ʻole me ka nui o nā kila hoʻoheheʻe a me nā slags e hiki ai ke hoʻohana i nā crucibles, nā pūʻulu thermocouple, a me na pani kapuahi.
Eia hou, ʻAʻole ʻona ka alumina, biocompatible, a me ka pale ʻana i ka radiation, e hoʻonui ana i kona pono i nā implants lapaʻau, pale nukelea, a me nā ʻāpana aerospace.
ʻOi aku ka maikaʻi o ka hoʻokuʻu ʻia ʻana o ka gas i loko o nā lewa hoʻomaʻemaʻe hoʻomaʻemaʻe (UHV) nā ʻōnaehana i ke aʻo ʻana a me ka hana semiconductor.
4. Nā Hana Hana a me ka Hui ʻenehana
4.1 Nā ʻāpana hoʻolālā a me nā ʻāpana pale lole
Hana ʻia nā poloka seramika alumina ma ke ʻano he mea ʻaʻahu pono i nā ʻāpana like ʻole mai ka lawe ʻana i ka hana pepa.
Hoʻohana ʻia lākou e like me nā linings i nā chutes, nā ʻeke, a me nā ʻino e pale aku i ka abrasion mai nā slurries, pauda, a me nā huahana granular, ʻoi aku ka hoʻolōʻihi ʻana i ke ola ma mua o ke kila.
I nā sila mechanical a me nā bearings, hāʻawi nā alumina keakea i ka hoʻoemi ʻana, paakiki kiekie, a me ka pale ʻana i ka corrosion, ka emi ʻana o ka mālama ʻana a me ka manawa haʻahaʻa.
Hoʻohui ʻia nā poloka hoʻohālikelike i loko o nā mea hoʻohaʻahaʻa, make, a me nā nozzles kahi mea nui loa ka palekana dimensional a me ka paʻa ʻaoʻao.
ʻO ko lākou ʻano māmā (mānoanoa ≈ 3.9 g/cm ELIMA) hāʻawi pū kekahi i ka mālama ʻana i ka ikehu ma ka hoʻoneʻe ʻana i nā ʻāpana.
4.2 Hoʻohana ʻia ka hoʻolālā kiʻekiʻe a me ke ala ʻana
Ma waho aʻe o nā kuleana maʻamau, Hoʻohana ʻia nā poloka alumina i nā ʻōnaehana ʻenehana holomua.
I nā mea uila, hana lākou ma ke ʻano he substrate pale, pumehana, a me nā mea ʻeleʻele niho niho laser ma muli o ko lākou mau hale wela a me ka dielectric.
I nā ʻōnaehana mana, lawelawe lākou ma ke ʻano he wahie paʻa paʻa (SOFC) ʻāpana, nā mea hoʻokaʻawale pākaukau, a me ka hui pū ʻana i nā mea e kū ana i ka plasma.
Ke puka mai nei ka hana hoʻohui o ka alumina ma o ka binder jetting a i ʻole stereolithography, e hiki ai i nā geometries paʻakikī i hiki ʻole ke loaʻa me ka hana kuʻuna.
Hoʻokumu ʻia nā ʻōnaehana crossbreed e hoʻokomo ana i ka alumina me nā kila a i ʻole nā polymers ma o ka brazing a i ʻole co-firing no nā ʻōnaehana multifunctional i ka aerospace a me ka pale..
Ke holomua nei ka noiʻi ʻepekema waiwai, Ke hoʻomau nei ka neʻe ʻana o nā poloka seramika alumina mai nā ʻāpana hana passive i nā mea hana i ka hana kiʻekiʻe, nā hoʻonā ʻenehana mau loa.
Ma ka hōʻuluʻulu, ʻO nā poloka seramika alumina ke kū nei no kahi papa kumu o nā porcelains kiʻekiʻe, ka hoʻohui pū ʻana i ka pono mechanical lōʻihi me ke kemika phenomenal a me ka palekana wela.
ʻO kā lākou maʻalahi ma waena o ka ʻoihana, uila uila, a ʻo nā kāʻei kapu ʻepekema e hōʻike ana i ko lākou waiwai mau i ka hoʻolālā o kēia wā a me ka ulu ʻana o ka ʻenehana hou.
5. Mea hoolaha
Alumina Technology Co., Ltd e nānā i ka noiʻi a me ka hoʻomohala ʻana, ka hana ʻana a me ke kūʻai ʻana i ka pauka alumini oxide, nā huahana alumini oxide, alumini oxide crucible, etc., lawelawe i ka uila, seramika, kemika a me nā ʻoihana ʻē aʻe. Mai kona hoʻokumu ʻia ʻana ma 2005, ua kūpaʻa ka hui i ka hāʻawi ʻana i nā mea kūʻai aku i nā huahana a me nā lawelawe maikaʻi loa. Inā ʻoe e ʻimi nei i ke ʻano kiʻekiʻe alumina al2o3, e ʻoluʻolu e hoʻokaʻaʻike mai iā mākou.
Nā huaʻōlelo: Palaka Alumina Ceramic, ʻAlumina Keramika, alumina
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.
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