1. Zvigadzirwa Zvimiro uye Kubatana Dhizaini
1.1 Hunhu hwemukati hweConstituent Phases
(Silicon nitride uye silicon carbide composite ceramic)
Silicon nitride (Kana hovhoni N ₄) uye silicon carbide (SiC) vose vari vaviri vakasungwa, non-oxide porcelains ane mukurumbira wekuita kwavo kwakatanhamara mukupisa kwepamusoro, zvinoparadza, uye nemichina inoda marongero.
Silicon nitride inoratidza inoshamisa kutyoka kusimba, thermal shock resistance, uye kudzikama kwakadzikama nekuda kweiyo yakasarudzika microstructure inoumbwa yakawedzera β-Si matanhatu N zviyo zvina zvinogonesa kuputsika uye kubatanidza masisitimu..
Inochengetedza kuomarara 1400 ° C uye ine yakaderera kupisa kwekuwedzera coefficient (~ 3.2 × 10 ⁻⁶/ K), kuderedza kupisa kwekushisa panguva yekukurumidza kuchinja kwekushisa.
Pane rimwe divi, silicon carbide inoshandisa kusimba kwekutanga, thermal conductivity (vanenge 120– 150 W/(m · K )zvemakristasi ari oga), oxidation resistance, uye makemikari inertness, zvichiita kuti ive yakanakisa kune yakakasharara uye inopenya inodziya yekubvisa zvikumbiro.
Bandgap yayo yakakura (~ 3.3 eV ye4H-SiC) nekuwedzera inopa yakanakisa electric insulation uye radiation kushivirira, inobatsira mune zvenyukireya uye semiconductor mamiriro.
Kana yabatanidzwa mumubatanidzwa, zvinhu izvi zvinoratidza maitiro anoenderana: Si matatu N ina inovandudza kusimba uye inokuvadza kuramba, nepo SiC inowedzera kupisa kwekutonga uye kushandiswa kwekudzivirira.
Iyo inokonzeresa yakasanganiswa ceramic inowana kuenzana kusingawanikwe nechero nhanho chete, kugadzira chigadzirwa chepamusoro-chekuita chakagadzirirwa mamiriro ebasa rakanyanyisa.
1.2 Compound Style uye Microstructural Engineering
Kurongeka kweSi matanhatu N ₄– SiC makomputa anosanganisira kutonga chaiko pamusoro pekutenderera kwedanho, zviyo morphology, uye chisungo chekubatana kuti chiwedzere kubatanidzwa.
Kazhinji, SiC inounzwa seyakakura particle rutsigiro (kubva ku submicron kusvika 1 µm) mukati meSi mana N ₄ matrix, kunyangwe zvimiro zvakayerwa kana kupatsanurwa zvivakwa zvinowanikwawo kune nyanzvi dzekushandisa.
Panguva yekuridza– kazhinji kuburikidza negasi-pressure sintering (GENERAL PRACTITIONER) kana kusunda kunodziya– SiC bits inokanganisa nucleation uye kukura kinetics ye β-Si maviri N mana zviyo, kazhinji inosimudzira akakwenenzverwa uye anotonyanya kutenderedza microstructures.
Uku kunatsa kunonatsiridza mechanical homogeneity uye kunoderedza kuremara saizi, kuwedzera kune simba riri nani uye kuvimbika.
Kuenderana kwemukati pakati pematanho maviri kwakakosha; nekuda kwekuti ese ari maviri ari covalent porcelains ane yakafanana crystallographic chiyero uye hunhu hwekuvandudza kupisa, vanogadzira miganhu yakarongeka kana semi-yakabatana inomira pakuita debonding pasi pemijenya.
Zviwedzerwa zvakadai seyttria (Y ₂ O VATATU) uye alumina (Zvose zviviri O ₃) anoshandiswa senge sintering rubatsiro kushambadza mvura-chikamu densification yeSi ina N ₄ pasina kukanganisa kuchengetedzeka kweSiC..
Zvisinei, kuwanda kwematanho okuwedzera anogona kukanganisa tembiricha yepamusoro, saka kuumbwa uye kugadzirisa kunoda kukwidziridzwa kuderedza glazed zviyo muganho mafirimu.
2. Maitiro ekugadzirisa uye Densification Matambudziko
( Silicon nitride uye silicon carbide composite ceramic)
2.1 Powder Prep Basa uye Maumbirwo Techniques
High-giredhi Si Two N ₄– SiC macomposites anotanga nehomogeneous musanganiswa weultrafine, hupfu hwepamusoro-soro uchishandisa milling yakanyorova, attrition milling, kana ultrasonic dispersion mune organic kana liquid media.
Kuwana kupararira kunoenderana kwakakosha kudzivirira sumbu reSiC, iyo inogona kushanda sekufunganya concentrators uye yakaderera kuputsika simba.
Mabhainda uye anoparadzira anopihwa kutsigira kumiswa kwekugadzira nzira dzakaita sekutsvedza kukanda, kuparadzira tepi, kana kuumbwa kwepfuti, zvinoenderana nechinhu chaunoda geometry.
Miviri yakasvibira mushure meiyo yakanyatso kuomeswa uye kudhindwa kubvisa organics isati yanyura, chirongwa chinoda kudzorwa mitengo yekudziya kwemba kudzivirira kupatsanurana kana kuputika.
Yepedyo-net-shape kugadzira, nzira dzekuwedzera senge binder jetting kana stereolithography dziri kubuda, zvichiita kuti zvikwanisike kune yakaoma geometries yaimbove isingagoneki neyakajairwa ceramic kugadzirisa.
Aya matekiniki anoda akagadziridzwa feedstocks ane maximized rheology uye eco-hushamwari kuoma, kazhinji kubatanidza porcelain inotorwa nepolymer kana mafotosensitive zvinhu zvakazara necomposite poda..
2.2 Sintering Devices uye Stage Security
Densification yeSinhanhatu N ZVINA– MaSiC macomposites anonetsa nekuda kweiyo yakasimba covalent bonding uye kushoma-kuzviparura kwenitrogen uye kabhoni pane anobatsira tembiricha..
Liquid-phase sintering uchishandisa isingawanzo-pasi kana alkaline planet oxides (e.g., Y VAVIRI O MATANHU, MgO) inoderedza tembiricha ye eutectic uye inosimudzira kutakurwa kwevanhu vakawanda nekunyungudika kwe silicate.
Pasi pekunetseka kwegasi (kazhinji 1– 10 MPa N ₂), kunyungudika uku kunofambisa kurongazve, mhinduro-kunaya, uye kwekupedzisira densification uku ichideredza kuparara kweSi mana N ZVINA.
Kuvapo kweSiC kunokanganisa viscosity uye kunyorova kwechikamu chemvura, zvichida kuchinja kukura kwezviyo anisotropy uye chitarisiko chekupedzisira.
Kurapa kwekudziya kwepashure-sintering kunogona kuve kwakabatana nekutora chimiro chinodzokororwa amorphous nhanho pamiganhu yezviyo., kuwedzera yakakwirira-tembiricha michina zvivakwa uye oxidation kuramba.
X-ray diffraction (XRD) uye kuongorora electron microscopy (WHICH) dzinoshandiswa nguva dzose kusimbisa kuchena kwesiteji, kushaikwa kwezvikamu zvechipiri zvisingadiwi (e.g., Vaviri N TWO O), uye yunifomu microstructure.
3. Mechanical uye Thermal Kubudirira Pazasi Mijenya
3.1 Stamina, Simba, uye Exhaustion Resistance
Kana Ovheni N ₄– SiC macomposites anoratidza epamusoro mechini mashandiro anopesana nemonolithic porcelains, ine flexural masimba anopfuura 800 MPa uye fracture sturdiness values kusvika ku7– 9 MPa · m 1ST/ ².
Mhedzisiro yekusimbisa yezvimedu zveSiC inokanganisa kufamba kwakashata uye kuwanda kwekutyoka, nepo Si mbiri dzakarebesa N zviyo zvina zvichisara kupa kusimbisa kuburikidza nekudhonza-kunze uye kubatanidza zvishandiso.
Iyi nzira yehuviri-inoomesa inokonzeresa chinhu chinopokana zvakanyanya nekukanganisa, kupisa bhasikoro, uye mechanical kuneta– yakakosha kune zvinotenderera zvinhu uye zvimiro zvemukati mune aerospace uye simba masisitimu.
Creep resistance inoramba yakatanhamara 1300 °C, inokonzerwa nekugadzikana kwecovalent network uye kudzikira kwezviyo muganho kunyungudika kana zvikamu zveamorphous zvadzikiswa..
Kusimba tsika dzinowanzosiyana kubva 16 ku 19 GPa, inopa kupfeka kwakatanhamara uye kuramba kuparara munzvimbo dzinoputika senge jecha-rakaremerwa kutenderera kana kubhururuka mafoni.
3.2 Thermal Administration uye Environmental Durability
Kuwedzerwa kweSiC kunosimudzira zvakanyanya kupisa kwekupisa kweiyo composite, kazhinji kakapetwa kaviri iyo yeSi nhanhatu yakachena N FOUR (iyo inosvika ku15– 30 W/(m · K) )kusvika ku40– 60 W/(m · K) zvinoenderana neSiC yewebhu zvemukati uye microstructure.
Iyi yakawedzera inodziya yekutamisa simba inobvumira kune yakawandisa yakavimbika yekudziya manejimendi muzvikamu zvakaratidzwa kune yakanyanya kupisa yenzvimbo, zvakadai semagetsi ekupisa kana zvikamu zvinotarisana neplasma.
Iyo composite inochengetedza dimensional chengetedzo pasi pemateru ekupisa, kumira kusvika ku spallation uye kutsemuka nekuda kwekuenderana kwekupisa kwekupisa uye yakakwirira yekushisa kuvhunduka parameter. (R-kukosha).
Oxidation kuramba ndiyo imwezve yakakosha mukana; SiC inoumba silica inodzivirira (SiO ₂) layer pakusangana neoxygen pane tembiricha dzakakwirira, iyo inotowedzera densifies uye kuchengetedza pamusoro penzvimbo nyaya.
Iyi passive layer inochengetedza zvese SiC uye Si Three N ₄ (iyo inowedzera oxidize kuSiO ₂ uye N ₂), kuve nechokwadi chekugara kwenguva refu mumhepo, utsi hunorema, kana kupisa mhepo.
4. Zvishandiso uye Remangwana Tekinoroji Trajectories
4.1 Aerospace, Energy, uye Industrial Systems
Vaviri N ZVINA– SiC makomputa anoiswa zvishoma nezvishoma mune inotevera-chizvarwa gasi jenareta, kwavanobvumira kupisa kwepamusoro kwekushanda, yakawedzera kushanda kwemafuta, uye kuderedza kutonhora kunodiwa.
Zvinhu zvakadai semhepo turbine blades, combustor liners, uye nozzle guide vanes vanowana kubva pakukwanisa kwechigadzirwa kutsungirira kupisa bhasikoro uye kurodha mekinika pasina kushatisa kwakanyanya..
Mumagetsi eatomu, kunyanya kupisa-kupisa gasi-yakatonhorera reactors (HTGRs), aya macomposites anoita seyakavharika gasi kana zvitsigiro zvekuvaka nekuda kwekuramba kwavo neutron irradiation uye fission chinhu chekuchengetedza kugona..
Mumaindasitiri setups, ivo vanoshandiswa mukuita liquified simbi, honi fenicha, uye mhino isingapfeki nemabhengi, uko simbi dzakajairwa dzaizodonha munguva pfupi.
Kureruka kwavo hunhu (ukobvu ~ 3.2 g/cm ZVISHANU) zvakare inoita kuti vafadze kune aerospace propulsion uye hypersonic mota zvikamu zviri pasi pekudziya kweaerothermal..
4.2 Advanced Production uye Multifunctional Integration
Chidzidzo chiri kusimukira chinotarisana nekusimudzira kushanda kwakayerwa Si matanhatu N ZVINA– SiC maitiro, uko chimiro chinosiyana munzvimbo kuti chiwedzere kupisa, mechanical, kana electro-magnetic pekugara zvivakwa mukati mechinhu chimwe chete.
Crossbreed masisitimu anosanganisira CMC (Ceramic matrix composite) zvivakwa zvine fiber reinforcement (e.g., SiC_f/ SiC– Si Five N ₄) dzvanya miganhu yekukuvara kushivirira uye kunetseka-ku-kutadza.
Kuwedzera kugadzirwa kwemakomponi aya kunobvumira topology-optimized warmth exchangers, microreactors, uye regenerative air conditioning channels nemukati latticework zvimiro zvisingagoneki kuburikidza nekugadzira.
Pamusoro pe, zvivakwa zvavo zvakakosha dielectric zvivakwa uye chengetedzo yemafuta inovaita vakwikwidzi ve radar-pachena radomes uye antenna mahwindo epamba mumapuratifomu anomhanya..
Sezvo zvinodiwa zvichikura kune zvigadzirwa zvinoita zvakavimbika pasi peyakanyanya thermomechanical mitoro, Kana hovhoni N ₄– SiC makomponi anomiririra kufambira mberi kwakakosha muinjiniya yeceramic, kubatanidza kushanda nekushanda mune imwechete, chikuva chisingaperi.
Mukupedzisa, silicon nitride– silicon carbide composite ceramics inoratidza simba rezvinhu-ne-dhizaini, kuwedzera simba re 2 innovative porcelains kugadzira iyo yakasanganiswa sisitimu ine kugona kwekukura munzvimbo dzakaomarara dzinoshanda.
Kuenderera mberi kwavo kumberi kuchaita basa guru pamberi pesimba rakachena, aerospace, uye tekinoroji dzemazuva ano dzekutengesa muzana remakore rechi21.
5. Vendor
TRUNNANO mutengesi weSpherical Tungsten Powder ine pamusoro 12 makore echiitiko mu nano-kuvaka simba kuchengetedza uye nanotechnology kusimudzira. Inobvuma kubhadhara kuburikidza neCredit Card, T/T, West Union uye Paypal. Trunnano ichaendesa zvinhu kune vatengi mhiri kwemakungwa kuburikidza neFedEx, DHL, nemhepo, kana nomugungwa. Kana iwe uchida kuziva zvakawanda nezve Spherical Tungsten Powder, ndapota inzwa wakasununguka kutibata nesu uye kutumira kubvunza.
Tags: Silicon nitride uye silicon carbide composite ceramic, Si3N4 uye SiC, advanced ceramic
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