Magnesium aluminium spinel (MgAl2O, MgO · Al2Oor MA) ine yepamusoro tembiricha yemagetsi emagetsi zvivakwa, yakanakisa peeling kuramba uye kusakara. Ndiyo yakajairika tembiricha yakakwira ceramic muAl2O-MgO system. Kukura kwakasarudzika kwecalcium hexaaluminate (CaAl12O19, CaO · 6AlO kana CA6) tsanga dzekristaro pamwe nendege yebasal inoita kuti ikure kuita maplatelet kana tsono morphology, inogona kuwedzera zvakanyanya kuoma kwezvinhu. Calcium dialuminate(CaAlO kana CaO · 2Al203, CA2) ine yakaderera coefficient yekuwedzera kupisa. Kana CAz inosanganiswa nezvimwe zvinhu zvine nzvimbo yakakwira yekunyungudika uye yakakwira coefficient yekuwedzera, inogona kuramba kukuvadzwa kunokonzerwa nekupisa kwekushisa. Naizvozvo, MA-CA macomposites akagamuchira kutariswa kwakakura semhando nyowani yemhando yepamusoro yekupisa ceramic zvinhu muindasitiri yetembiricha yepamusoro nekuda kwehuwandu hwayo hweCA6 uye MA.
Mubepa rino, MA-ceramic, MA-CA2-CA ceramic composite uye MA-CA ceramic composites yakagadzirwa nepamusoro tembiricha solid-phase sintering, uye pesvedzero yemaminerari pazvinhu zvezvinhu izvi zveceramic zvakadzidzwa. Iyo yekusimbisa nzira yemaminerari pakuita kweceramics yakakurukurwa, uye inotevera tsvakiridzo yakawanikwa:
(1) Mhedzisiro yacho yakaratidza kuti kuwanda kwehuwandu uye kusimba kwesimba reMA ceramic zvinhu zvakawedzera zvishoma nezvishoma nekuwedzera kwekushisa kwekupisa. Mushure mekuita sintering pa 1600 ye 2hthe sintering performance ye MA ceramic yakanga isina kunaka, ine huwandu hwakawanda hwe 3. 17g / cm3 uye flexural simba kukosha kwe133. 31MPa. Nekuwedzera kweiyo mineralizer Fez03, kuwanda kwehuwandu hweMA ceramic zvinhu zvakawedzera zvishoma nezvishoma, uye simba rekuchinja rakatanga kuwedzera ndokuzodzikira. Apo mari yekuwedzera yaive 3wt. %, iyo flexural simba yakasvika pakakwirira 209. 3MPa.
(2) Kuita uye kuumbwa kwechikamu cheMA-CA6 ceramic kune hukama nehukuru hwechikamu cheCaCO uye a-AlO mbishi zvinhu, kuchena kwe-Al2O3, tembiricha ye synthesis uye nguva yekubata. Uchishandisa diki diki saizi CaCO uye yakakwirira kuchena a-AlzO3 seyakagadzirwa, mushure mekupisa pa1600 ℃ uye kubata kwe2h, yakagadzirwa MA-CA6 ceramic ine simba rakakura rekuchinjika. Iyo particle size yeCaCO3 inoita basa rakakosha mukuumbwa kweCA chikamu uye kukura uye kukura kwekristaro tsanga muMA-CA6 ceramic zvinhu. Pakupisa kwepamusoro, kusachena kweSi mu-Alz0 kunogadzira chikamu chemvura chipfupi, chinoita kuti morphology yeCA6 tsanga dzisimukira kubva kuplatelet kuenda kune equiaxed.
(3) Mhedzisiro yezvicherwa ZnO uye Mg (BO2)z pane zvinhu zveMA-CA zvinosanganiswa uye nzira yekusimbisa yakaongororwa. Zvinoonekwa kuti(Mg-Zn)AI2O4 solid solution uye boron-ine liquid phase inoumbwa nemamineralizers ZnO neMg(BO2)z inoita saizi yezviyo zveMA idiki uye zviri muMA zviwedzere. Aya matanho akaomeswa akaputirwa ne microcrystalline MA zvimedu kuti aumbe dunhu rakapararira yakaomerwa miviri, izvo zvinotungamira mukushandurwa kweCA6 tsanga kuita tsanga dzakaenzanirana, nekudaro ichisimudzira densification yeMA-CA ceramic zvinhu nekuvandudza simba rayo rekuchinjika.
(4) Nekushandisa analytical pure Al2Oinstead of a-AlzO, MA-CA2-CA ceramic composites akagadzirwa kubva analytically pure raw materials. Migumisiro ye mineralizers SnO₂ uye HBO pane zvemuviri uye zvemagetsi zvivakwa, microstructure uye chikamu chekuumbwa kwezvikamu zvakadzidzwa.
Mhedzisiro yacho inoratidza kuti yakasimba mhinduro uye boron-ine yenguva pfupi yemvura chikamu inoonekwa mune ceramic zvinhu mushure mekuwedzera mineralizers SnO2 uye H2BO; zvakateerana, inoita iyo CA2 chikamu ichinje kune CA chikamu uye inomhanyisa kuumbwa kweMA uye CA6, nekudaro inovandudza sintering chiitiko checeramic material. Iyo dense nhanho inoumbwa neakawandisa Ca inoita kuti chisungo chiri pakati peMA neCA6 zviyo zviome, izvo zvinovandudza michina yezvinhu zveceramic zvinhu.
Nguva yekutumira: Aug-29-2023