Zirconia Toughened Alumina – Kuwedzerwa Simba reIndasitiri Kunaka

Zirconia Toughened Alumina (ZTA) ndeye ceramic yakasarudzika, inosiyaniswa nekuomarara kwepamusoro uye kuramba kwekutyoka nekuda kweyttria yakagadzikana zirconia zvimedu zvakaparadzirwa kuburikidza nealumina matrix..

Ichi chinyorwa chinogona kumira nekukurumidza kuchinja kwekushisa pasina kuputika kana kutsemuka, inopesana nemakemikari ekuora uye inopa yakanakisa yekupisa kuvhunduka kusagadzikana.

Yakanakisa Corrosion Resistance

ZTA ceramics inopa yakaringana pakati pesimba uye kukosha, kusimba kudarika zvigadzirwa zvealuminium asi zvisingadhuri pane yakachena zirconia. Zvinhu zvavo zvema mechanical – kutyoka kuoma, flexural simba uye kuoma pamwe chete nekupisa kwekuvhunduka – ita kuti dzive dzakakodzera kugadzira zvishandiso zveindasitiri sekucheka mavhiri.

ZTA inowana zvivakwa zvayo zvepamusoro nekuda kwekuwedzera kweyttria yakagadzikana zirconia (YSZ) zvidimbu mukati mealuminium matrix. Kana yakaparadzirwa zvakaenzana kwese, YSZ inobatsira kukwidziridza kuoma-kutsemuka kusimba uye kusimba kwesimba rezvinhu zvese zviri zviviri zvichikonzera kusarudzika kupfeka kuramba., kemikari inertness patembiricha yekamuri uye kupisa kuomarara / kubvuta simba zvivakwa kune yakasarudzika ceramic zvinhu.

ZTA zvigadzirwa’ mechanical properties inoenderana zvakanyanya nemaitiro avo ekugadzira hupfu, kusanganisira mishonga yekupisa, calcination nzira, kuomesa matekinoroji uye sintering maitiro pamwe neakagadziridzwa maumbirwo ane ekuwedzera akawedzerwa panguva yekugadzira. Zvose izvi zvinhu zvine simba rekukurumidza pasimba razvo, elasticity uye kuoma zvinhu.

Yakanakisa Thermal Shock Resistance

ZTA ceramics inopa yakanakisa yekupisa kuvhunduka kuramba, kuvaita sarudzo yakanakisa yeaerospace application inoda huwandu hwesimba, kuoma, uye makemikari inertness. Kana yakaparadzirwa zvakafanana mukati mealumina matrix YSZ inogona kugadzirwa. Imwe yakadaro shanduko-yakaomeswa zirconia-alumina ceramic yatinopa ndeye BIOLOX delta iyo inogona kuwanikwa inoshandiswa kune orthopedais inotakura zvinhu senge kutsiva hudyu..

Shanduko-inokonzeresa kushushikana kubva kune metastable tetragonal kuenda kumonoclinic chimiro cheYSZ inoburitsa vhoriyamu yekuwedzera uye shear dhiri rinopikisa kupararira kwekuputika., kuwedzera kuoma kwekutyoka uku panguva imwe chete ichivandudza flexural simba. Kuita kwealumina yakadaro-YSZ shanduko-yakaomeswa ceramic inotsamira pane kugadzirisa mamiriro pamwe neiyo stoichiometry ye constituent oxides mukuita sintering..

Kusadzora zvakanaka kudzorwa sintering mamiriro anogona kukonzera yakaderera flexural simba uye kushomeka homogeneity yealumina-YSZ matrix., zvinokwanisika nekuda kwekupinzwa kwemhepo kana particle agglomeration. Nekuwedzera zvinowedzera zvakadai seyttria kana magnesium oxides, imwe inogona kuderedza tetragonal kune monoclinic shanduko yekushisa uye kuwedzera zirconia's sintering properties.

Yakanakisa Wear Resistance

ZTA haisi kungopfuura chete maererano nekupisa kwekutyisa uye kuramba kwecorrosion, asi zvakare inopfeka zvakanyanya nekuda kweiyo tetragonal-monclinic chikamu chekushandura encasing michina. Uyezve, in vitro zvidzidzo zvakaratidza kuti ZTA zvikamu hazvinyanyi kuita hydrothermal degradation – chimwe chinhu chakakosha muhudyu kutsiva musoro wemukadzi uye mukombe ceramics (senge BIOLOX delta inogadzirwa neCeramTec).

Miedzo yekupfeka yakaitwa paZTA zvinhu zvakagadzirwa nealumina-zirconia composite zvinhu zvakaburitsa zvinokatyamadza mhedzisiro maererano nekupfeka kuramba., flexural simba nekuoma. ZTA samples dzakafumurwa kune akawanda macycles muhudyu simulator yakaratidza kuderera kudiki nekudzika kwakadzika kwepamusoro roughness pane monolithic zirconia components..

ZTA zvikamu zvakaratidza kuti zvakafanira kukumbira zvikumbiro mukugadzira mota (kupisa uye kutonhora kugadzira tooling, can-kuvhara rollers uye capstans); indasitiri yemagetsi (ma bearings, orifice inoisa uye vortex vanotsvaga); kugadzira zvokudya (homogenizing pombi zvikamu); uye indasitiri yesimba. Zvimiro zvavo zvema mechanical zvinoenderana nemhando dzakawanda: nzira dzekugadzirira dzinoshandiswa kugadzira hupfu; kuomesa nzira dzinoshandiswa panguva calcination; maitiro ekuumba anogamuchirwa panguva yekugadzira sintering; tailored shape; additives akawedzerwa uye particle size kugovera pakati pevamwe.

Excellent Simba

ZTA ceramics inoshandisa kushushikana-induced shanduko kubatanidza zirconia kuita alumina matrix, kuwedzera simba uye kusimba nekufamba kwenguva. Izvi zvinoita kuti ZTA ive yakanakisa ceramic mhinduro yemaindasitiri maapplication anoda kuomarara, high corrosion resistance, thermal shock tolerance uye thermal shock tolerance.

Under strain, tetragonal metastable precipitates mu cubic alumina inoshanduka kamwe kamwe kuita monoclinic particles izvo zvinowedzera kuomarara kwayo nekutyoka nekugadzira compression surface layers inonamatira pakatsemuka mukati me matrix ayo..

Shanduko toughening chinhu chinozivikanwa sekuti fracture toughening, umo kuwedzera kuomarara kwekutsemuka kwealumina kunoguma nekupfupika kwehurefu, kushoma crack blunting, uye kudyidzana kwakagadziridzwa ne preexist microcracks. Izvi zvinobvumira zvakaoma-pa-zvakaoma uye zvakaoma-pa-zvinyoro-kubereka musanganiswa izvo zvinoshandiswa mune zvemazuva ano zvekurapa-giredhi ceramics senge kutsiva hudyu.. Uyezve, Yttrium yakagadzikana zirconia implants inozivikanwa sey-TZP inopa dziviriro kubva pakupfeka nekufamba kwenguva.