Mamwe marara emumaindasitiri anoratidzwa kuti anobatsira mukugadzirwa kwemullite ceramics. Aya marara emaindasitiri akapfuma mune mamwe simbi oxides se silica (SiO2) uye alumina (Al2O3). Izvi zvinopa marara mukana wekushandiswa sechinhu chekutanga chekugadzira mullite ceramics kugadzirira. Chinangwa cheiyi bepa rekuongorora ndechekuunganidza uye kuongorora nzira dzakasiyana dzekugadzira mullite ceramics dzakashandisa marara akasiyana emumaindasitiri sezvinhu zvekutanga. Ongororo iyi zvakare inotsanangura tembiricha yekupisa uye makemikari ekuwedzera anoshandiswa mukugadzirira nemhedzisiro yawo. Kuenzanisa kwesimba remuchina uye kuwedzera kwekupisa kwezvakashumwa mullite ceramics yakagadzirwa kubva kune dzakasiyana siyana tsvina dzemaindasitiri zvakagadziriswawo mubasa iri.
Mullite, inowanzonzi 3Al2O3∙2SiO2, yakanakisa ceramic zvinhu nekuda kwekushamisa kwayo kwemuviri zvimiro. Iine nzvimbo yakakwira yekunyungudika, yakaderera coefficient yekuwedzera kwekupisa, simba repamusoro pakupisa-kwepamusoro, uye ine zvese zvinopisa zvinopisa uye zvinokambaira zvinoramba [1]. Aya anoshamisa ekupisa uye emuchina zvivakwa zvinoita kuti zvinhu zvishandiswe mukushandisa senge refractories, honi fenicha, substrates ye catalytic convertors, machubhu echoto, uye nhovo dzekupisa.
Mullite inogona kuwanikwa chete seyakashomeka mineral paMull Island, Scotland [2]. Nekuda kwekuvapo kwayo kushoma mumasikirwo, ese mullite ceramics anoshandiswa muindasitiri akagadzirwa nevanhu. Tsvagiridzo yakawanda yakaitwa kugadzirira mullite ceramics vachishandisa akasiyana precursors, kutanga kubva kumaindasitiri / marabhoritari giredhi kemikari [3] kana zvinongoitika zvealuminosilicate zvicherwa [4]. Nekudaro, mutengo wezvinhu izvi zvekutanga unodhura, izvo zvinogadzirwa kana kucherwa zvisati zvaitika. Kwemakore, vaongorori vanga vachitsvaga dzimwe nzira dzehupfumi dzekugadzira mullite ceramics. Nekudaro, akawanda mullite precursors anobva mumarara eindasitiri akashumwa mumabhuku. Idzi tsvina dzeindasitiri dzine zvakakwirira zvesilica uye alumina inobatsira, inova ndiyo yakakosha makemikari komisheni inodiwa kugadzira mullite ceramics. Mamwe mabhenefiti ekushandisa aya marara emaindasitiri isimba uye kuchengetedza mutengo kana marara akatsauswa uye akashandiswa zvakare sechinhu cheinjiniya. Uyezve, izvi zvinogonawo kubatsira kuderedza mutoro wezvakatipoteredza uye kuwedzera hupfumi hwayo.
Kuti tiongorore kana tsvina yemagetsi yakachena inogona kushandiswa kugadzira mullite ceramics, iyo yakachena electroceramics tsvina yakasanganiswa nealumina powders uye yakachena electroceramics tsvina seyakagadzirwa yakaenzaniswa. zvivako zvemullite ceramic zvakaongororwa. XRD uye SEM yakashandiswa kudzidza chikamu chekuumbwa uye microstructure.
Mhedzisiro yacho inoratidza kuti zviri mukati memullite zvinowedzera nekusimudza tembiricha yekupisa, uye panguva imwe chete iyo yakawanda density inowedzera. Izvo zvigadzirwa ndeye yakachena electroceramics tsvina, saka iyo sintering chiitiko chikuru, uye sintering process inogona kukurumidza, uye density inowedzera zvakare. Kana iyo mullite ichigadzirwa chete nemarara emagetsi, kuwanda kwehuwandu uye kusimba kwesimba kwakakura, iyo porosity idiki, uye yakazara yemuviri zvivakwa zvichave zvakanakisa.
Zvichitungamirirwa nekudiwa kwedzimwe nzira dzakachipa uye dzine hushamwari kwezvakatipoteredza, kuedza kwakawanda kwekutsvagisa kwakashandisa marara akasiyana siyana eindasitiri sekutanga zvinhu kugadzira mullite ceramics. Nzira dzekugadzirisa, tembiricha yekupisa, uye makemikari ekuwedzera akaongororwa. Nzira yechinyakare yekugadzira nzira yaisanganisira kusanganisa, kudzvanya, uye kuita sintering ye mullite precursor ndiyo yainyanyo shandiswa nzira nekuda kwekureruka kwayo uye kuita mutengo. Kunyange zvazvo nzira iyi ichikwanisa kugadzira porous mullite ceramics, iyo inooneka porosities yezvakaguma mullite ceramic yakanzi igare pasi pe50%. Nekune rimwe divi, kukanda chando kwakaratidzwa kuve kunokwanisa kugadzira mullite ceramic ine porous, ine porosity inosvika 67%, kunyangwe pakupisa kwakanyanya kwe1500 ° C. Kuongororwa kwekushisa kwekupisa uye zvakasiyana-siyana zvemakemikari zvinoshandiswa mukugadzirwa kwemullite zvakaitwa. Izvo zvinodikanwa kushandisa sintering tembiricha inopfuura 1500 ° C yekugadzira mullite, nekuda kweiyo yepamusoro reaction rate pakati peAl2O3 neSiO2 mune inotangira. Nekudaro, yakawandisa silica yemukati yakabatana nekusachena mune precursor inogona kutungamira kune sampuli deformation kana kunyungudika panguva yekupisa-kupisa sintering. Kana zviri zvemakemikari ekuwedzera, CaF2, H3BO3, Na2SO4, TiO2, AlF3, uye MoO3 yakashumwa seyamuro inoshanda yekudzikisa sintering tembiricha nepo V2O5, Y2O3-doped ZrO2 uye 3Y-PSZ inogona kushandiswa kukurudzira densification yemullite ceramics. Doping nemakemikari ekuwedzera akadai seAlF3, Na2SO4, NaH2PO4 · 2H2O, V2O5, uye MgO yakabatsira kukura kweanisotropic yendebvu dzemullite, izvo zvakazosimudzira kusimba kwemuviri uye kusimba kwemullite ceramics.
Nguva yekutumira: Aug-29-2023