ʻO ka mana o nā mineralizers i nā waiwai o kēia mau mea seramika

ʻO ka spinel alumini magnesium (MgAl2O, MgO·Al2Oor MA) loaʻa nā waiwai mechanical kiʻekiʻe kiʻekiʻe, ʻoi aku ka maikaʻi o ka ʻili ʻana a me ka pale ʻana i ka corrosion. ʻO ia ka mea maʻamau kiʻekiʻe kiʻekiʻe seramika ma ka ʻōnaehana Al2O-MgO. ʻO ka ulu maikaʻi ʻana o ka calcium hexaaluminate (CaAl12O19, CaO·6AlO a i ʻole CA6) nā hua aniani ma ka papahele basal e ulu ai i platelet a i ʻole morphology needle, hiki ke hoʻonui nui i ka paʻakikī o ka mea. ʻO ka dialuminate calcium(CaAlO a i ʻole CaO·2Al203, CA2) he haʻahaʻa haʻahaʻa o ka hoʻonui wela. Ke hui pū ʻia ʻo CAz me nā mea ʻē aʻe me ka helu heheʻe kiʻekiʻe a me ke koena kiʻekiʻe o ka hoʻonui ʻana, hiki iā ia ke pale maikaʻi i ka pōʻino i hana ʻia e ka haʻalulu wela. No laila, ua loa'a ka mana'o nui o ka MA-CA composites ma ke 'ano he 'ano hou o ka mea wela ki'eki'e i loko o ka 'oihana wela wela ma muli o kona mau waiwai piha o CA6 a me MA.

I loko o kēia pepa, ua hoʻomākaukau ʻia nā mea hoʻohui ʻia ʻo MA, MA-CA2-CA a me MA-CA e ka kiʻekiʻe wela o ka sintering solid-phase, a ua aʻo ʻia ka mana o nā mineralizers i nā waiwai o kēia mau mea ceramic. Ua kūkākūkā ʻia ke ʻano hoʻoikaika ikaika o nā mineralizers i ka hana ʻana i nā seramika, a ua loaʻa nā hopena noiʻi aʻe:
(1) Ua hōʻike ʻia nā hopena i ka piʻi mālie a me ka ikaika flexural o nā mea seramika MA me ka piʻi ʻana o ka mahana sintering. Ma hope o ka sintering ma 1600 no 2hthe sintering hana o MA ceramic ua ilihune, me ka bulk density o 3. 17g/cm3 a me ka flexural ikaika waiwai o133. 31MPa. Me ka piʻi ʻana o ka mineralizer Fez03, ua piʻi mālie ka nui o nā mea seramika MA, a ua hoʻonui mua ka ikaika flexural a laila emi iho. I ka 3wt o ka huina hoonui. %, ua hiki ka ikaika flexural i ka 209. 3MPa kiʻekiʻe loa.

(2) Ua pili ka hana a me ka mahele o ka MA-CA6 ceramic i ka nui o ka nui o ka CaCO a me a-AlO maka, ka maemae o a- Al2O3, ka mahana o ka synthesis a me ka manawa paa. Ke hoʻohana nei i ka CaCO liʻiliʻi liʻiliʻi a me ka maʻemaʻe kiʻekiʻe a-AlzO3 ma ke ʻano he kumu, ma hope o ka sintering ma 1600 ℃ a paʻa no 2h, ʻo ka synthesized MA-CA6 ceramic he ikaika flexural nui. He mea koʻikoʻi ka nui o ka ʻāpana o CaCO3 i ka hoʻokumu ʻana i ka māhele CA a me ka ulu ʻana a me ka hoʻomohala ʻana o nā hua aniani i loko o nā mea seramika MA-CA6. Ma ka wela kiʻekiʻe, ʻo ka haumia Si i a-Alz0 e hoʻokumu i kahi pae wai transient, kahi e hoʻololi ai i ka morphology o nā hua CA6 mai platelet a equiaxed.

(3) Ua noiʻi ʻia ka hopena o nā mineralizers ZnO a me Mg(BO2)z i nā waiwai o nā composites MA-CA a me ka mīkini hoʻoikaika. Ua ʻike ʻia ʻo (Mg-Zn)AI2O4 paʻa paʻa a me ka boron-containing phase wai i hana ʻia e nā mineralizer ZnO a me Mg(BO2)z e liʻiliʻi ai ka nui o ka palaoa o MA a hoʻonui ʻia ka ʻike o MA. Hoʻopili ʻia kēia mau ʻāpana paʻa me nā ʻāpana microcrystalline MA e hana i nā kino ākea ākea ākea, kahi e alakaʻi ai i ka hoʻololi ʻana o nā hua CA6 i loko o nā kīʻaha equiaxed, no laila e hoʻolaha ana i ka densification o nā mea seramika MA-CA a hoʻomaikaʻi i kona ikaika flexural.

(4) Ma ka hoʻohana analytically pure Al2Oma kahi o a-AlzO, MA-CA2-CA ceramic composites i synthesized mai analytically maemae maka. Ua aʻo ʻia nā hopena o ka mineralizers SnO₂ a me HBO i nā waiwai kino a me nā mīkini, microstructure a me ka hoʻokumu ʻana o nā composites.

Hōʻike nā hopena i ka hoʻonā paʻa a me ka pae wai transient i loko o ka boron i loko o ka mea keramika ma hope o ka hoʻohui ʻana i nā mineralizers SnO2 a me H2BO; i kēlā me kēia, hoʻololi ia i ka māhele CA2 i ka māhele CA a hoʻonui i ka hoʻokumu ʻana o MA a me CA6, pēlā e hoʻomaikaʻi ai i ka hana sintering o ka mea ceramic. ʻO ka māhele paʻa i hoʻokumu ʻia e ka Ca keu e hoʻopaʻa paʻa ai i ka pilina ma waena o nā hua MA a me CA6, kahi e hoʻomaikaʻi ai i nā waiwai mechanical o nā mea seramika.