Zirconia Toughened Alumina

Alumina-zirconia macomposites anoomeswa kuburikidza nekushushikana-induced shanduko yeakanaka tetragonal zirconia particles kuita yakaoma., zvinhu zvakasimba zvine simba rakanyanyisa uye kuomarara izvo zvinoita kuti ive yakakodzera kune akasiyana maapplication uye nharaunda.

Gelcasting yakashandiswa kugadzira sampuli dzeZTA, nekunyatsotarisisa kwakabhadharwa pakugadzirisa slurry kugadzirira neyakasiyana yakasimba mitoro, kuumba uye de-moulding maitiro, solvent drying (osmotic maringe nekuomeswa kwemhepo), uye pyrolysis uye sintering maitiro pa 1550 uye 1650 degC yekuomesa zvinangwa. Density, kuoma, kutyoka kuoma uye flexural simba ongororo dzakaitwa pamasampuli ese akagadzirwa achishandisa gelcasting..

Iine kuoma kwepamusoro

Zirconia yakaoma alumina (ZTA) yakanakira kukumbira zvikumbiro nekuda kwekuoma kwayo kwakanyanya. Yakagadzirwa uchishandisa gel casting, ZTA inopa mari yekuchengetedza pamusoro pezvimwe zvinhu zveceramic uku ichizvikudza simba repamusoro. ZTA inogona kushivirira tembiricha ye 1650 degC ichiramba ichidhura nekuda kwekuve inoumbwa nehupfu yeyttria-yakadzikama zirconia uye alumina iyo yakasanganiswa uchishandisa gel kukanda uye sintering maitiro..

ZTA ceramics inomira pachena nekuda kwekusimba kwayo kunoshamisa nekuda kweshanduko yayo kubva kune tetragonal kuenda ku monoclinic phases., kuwedzera kuomarara kwekutyoka neanosvika maviri. Iyi nzira inokonzerwa nekusiyana pakati pe elastic modulus yavo pakati pezvikamu zvavo zvakasiyana – zirconia uye alumina maererano – zvichireva kuti minda yekushushikana inogadzirwa panguva yekushandurwa kwechikamu chaiko kuita kudzikisira kupararira kwekuita ZTA kuomarara kupfuura echinyakare alumina ceramics..

Zirconia-yakaomeswa alumina inozvirumbidza nekuomarara kwepamusoro uye kuomarara kwekutsemuka pamusoro peAlN, pamwe chete nepamusoro-soro simba rekushanduka-shanduka zvichienzaniswa nezvose zvezvinhu izvozvo, zvichiita kuti ive yakanakisa mumiriri wemotokari uye inogoneka magetsi ekushandisa. Uyezve, ZTA inoratidzira yemhando yepamusoro yekupisa kuvhunduka pamwe neakanaka magetsi ekudzivirira zvivakwa, kuita kuti ive yakakodzera kushandiswa kwemotokari uye zvimwe zvinoshandiswa pakurapa; uyezve, ZTA hairatidze kukuvadzwa kweDNA kana cancerogenetic mhedzisiro mumasero emammalian, ichipa mukana wekushandisa semazino ekudyara zvinhu nekuda kweakanakisa ma mechanical zvivakwa uye biocompatibility zvivakwa.

Iine kuoma kwepamusoro

Zirconia yakaoma alumina (ZTA), kana zirconium toughened alumina, chinhu checeramic chinoumbwa nealumina uye zirconium inopa yakasarudzika michina zvinhu senge yakakwira flexural kuoma., kutyoka kuoma, elasticity, kuoma uye kupfeka kuramba. Chiyero pakati pezvinhu izvi chinogona kugadziridzwa zviri nyore kuti chisangane nemashandisirwo chaiwo; Zvigadzirwa zveZTA zvakapfuura izvo zvakagadzirwa ne zirconia yakachena asi zvichinyanya kudhura.

Ichi chinyorwa chakashandiswa zvinobudirira muhudyu inotsiva misoro yevakadzi uye acetabular liners nekuda kweiyo biocompatibility uye yenguva refu inotakura mutoro.. Zvisinei, kukodzera kwayo kunofanira kutanga kuongororwa mu vivo.

ZTA inowana kusimba kwepamusoro nekuda kweiyo metastable tetragonal chimiro uye kumanikidza simba kubva kune alumina matrix., uko kushushikana kwakanyanya kunokonzeresa kushandura kuomarara; ndizvo, zirconia inoshandura kuita monoclinic mafomu kana ichiiswa kumanikidziro masimba kubva kune alumina matrix, kuburitsa simba rekushushikana rinononoka kana kumisa kupararira kwekuputika nekudaro kuburitsa shanduko yakaoma inodzivirira kupararira.

ZTA inozvirumbidza yakawedzera kusimba kwesimba pamusoro 99% alumina ceramics nekuda kweiyo metastable tetragonal chikamu uye alumina matrix, zvakanyanya kukurira mune izvi. Zvisinei, alumina-zirconia macomposites anogona kuita brittle nekuda kwekudzika kwehomogeneity uye kuvharirwa kwemhepo pamwe nechikamu che agglomeration chinotungamira kune kuremara uye kuderera kwesimba rekuchinja. – asi kuita kwayo kunopfuura echinyakare alumina ceramics mune zvekurapa uye maindasitiri mashandisirwo zvakafanana.

Ine simba rakakwirira

Zirconia toughened alumina chinhu chakasimba kwazvo, izvo zvinoita kuti ive yakakodzera kune inotakura-kutakura zvikumbiro. Yakagadzirwa kuburikidza nekushushikana-induced shanduko yeakanaka tetragonal zirconia particles kuita alumina matrix., kugadzirwa kwayo kunoguma mukugovaniswa kwakafanana kwezvikamu zvine simba rinoshamisa uye kuoma kwezvinhu.

Ceramic zvakare inopokana zvakanyanya nemakemikari corrosion. Yakakodzera kune akawanda mashandisirwo anosanganisira ekurapa anodyara uye zvinhu zvemazino nekuda kwekugona kwayo kutsungirira kudzokororwa kuratidzwa kumvura yemuviri nemakemikari..

ZTA zvakare inomira pachena nekupisa kwayo kuvhunduka, sezvo zirconia zvidimbu zvaro zvakapararira mukati mealumina matrix inotora simba rekupisa uye kugadzira compression stress kudzivirira kuparara. – izvi zvinobvumira ZTA ceramic kuti ishandiswe zvakachengetedzeka kune yakakwira tembiricha yekushandisa senge yechoto zvikamu uye turbine injini zvikamu pasina njodzi kukuvara kana kutadza..

ZTA inowana simba rayo kubva pakuumbwa kwayo uye nanoparticle kugovera, pamwe nekupisa isostatic kudzvanya uye kwakajairika sintering yekuwedzera kuvimbika. Kuti uwedzere kushanduka, inogona zvakare kugadzirwa uchishandisa sol-gel yekugadzira nzira dzinoshandura mamorekuru kuita makasimba – muchiitiko ichi kubatanidza alumina poda uye zirconia powders muiri-semvura yakaita segel inozokwanisa kuumbwa kuita maumbirwo akasiyana isati yabikwa muchoto kusvika kupora kwaitika kusati kwaumbwa nekuomeswa kuti kubereke ZTA ine high density yakanaka makristasi zvimiro pamwe chete nekristaro yakachinjwa., atomic, zvemagetsi zvinokonzeresa ZTA iyo inoratidza yakakwira density pamwe neyakashandurwa crystal, maatomu enyika pamwe chete neyakashandurwa makristasi zvimiro, akachinjwa makristasi zvimiro pamwe chete nekristaro yakashandurwa, maatomu enyika inoguma nekuchinjwa kwekristaro, atomic nyika yekuwedzera kuvimbika.

Iine high temperature resistance

ZTA zvinhu zvinopa yepamusoro tembiricha kuramba, kuita kuti ive yakakodzera kune zvikumbiro zvinoda kusimba zvakanyanya. Uyezve, Kudzivirirwa kwayo nekuora uye kusimba kwepamusoro-soro kunoita kuti ZTA ive yakakodzera kuratidzwa kwenguva refu kune tembiricha kusvika. 1773 K – zvichiita kuti ive sarudzo yakanakisa yenguva refu yemidziyo kuratidzwa kune yakanyanya kupisa mazinga.

Tsvagiridzo ichangoburwa inoratidza kuti zirconia inowedzera michina yealumina, kunyanya kuoma kwayo uye kusimba kwayo. Izvi zvinoitika nekuti zirconia zvimedu zvinogadzira compressive kusagadzikana pane alumina matrix kana iri pasi pekunetseka; iyi compression stress inobatsira kuderedza kupararira kwekuputika uku panguva imwe chete ichiwedzera kuoma kwekupwanya.

Zvinhu zvakawanda zvinokanganisa mashandiro eZTA macomposites, senge nzira dzayo dzekupisa uye tembiricha pamwe nehuwandu hwezirconia hwakawedzerwa. Kazhinji, kuwedzera zirconia dzakawanda kunowedzera kuwedzera kushanda; zvisinei kuti zirconia yakawandisa inogona kuderedza simba rayo rekushanduka-shanduka pamwe nekuoma kwekutsemuka.

Alumina-zirconia-yakaoma alumina (KUTI) ndeye advanced tekinoroji ceramic zvinhu zvinoshandiswa mune akasiyana maindasitiri ekushandisa. Yakagadzirwa nealumina uye zirconium oxide yakabatana neceramic zvisungo zvinosimudzira kusimba kwesimba uye kutsemuka kusimba kwechinhu., AZT inogadzira zvinhu zvakanakisa zvemuchina wakafumurwa kune tembiricha yakanyanya senge oveni nemavira.