Zirconia Toughened Alumina
Zirconia yakaoma alumina (ZTA) chinhu chepamusoro checeramic chinoshandiswa zvakanyanya mumavharuvhu seals, bushings, zvikamu zvepombi uye midziyo yekucheka nekuda kwesimba rayo uye kugadzikana kwemakemikari – sezvinoratidzwa nekukwanisa kwayo kutsungirira mitoro inorema pasina kuderera kwakanyanya.
ZTA inozvirumbidza inoshamisa yekushisa kuvhunduka uye inogona kumira kamwe kamwe kuchinja kwekushisa, pamwe nekushanduka kwekushisa nekukurumidza. Verenga kuti udzidze zvakawanda nezve ma mechanical properties!
Kuoma
Zirconia yakawedzerwa kune alumina matrix inowedzera kuoma kwayo, kutyoka kusimba uye kusimba kwesimba uku uchiwedzera kuramba kupfeka uye kukukurwa. Iyo nzira inowanzobatanidzwa ndeye shanduko yechikamu inoteverwa ne microcrack kuumbwa asi inogona kusanganisira kushushikana dzidziso dzidziso sezviri kushanda..
Metastable tetragonal zirconia precipitates iyo inoumba kupararira kwakanaka mukati mealumina matrix inogona kungoerekana yachinja kuita monoclinic mafomu apo kumanikidzwa kwavo kunosimudzwa panguva yekuparadzira kuputika., kupa simba kurwisa minda yekushushikana inotyaira kuparadzira crack.
ZTA ceramic ine hukuru hwekutyoka kuomarara uye kuomarara zvichienzaniswa nemamwe oxide-based engineering ceramics, pamwe nekaviri cyclic kuneta simba reY-TZP. Saizvozvo, maitiro ayo anoita kuti ive yakakodzera kune zvikumbiro zvinoda kunyanyisa kupfeka kuramba, makemikari inertness uye kuderera kwakaderera pamwe chete nesimba guru uye kuoma.
Flexural Strength
ZTA ceramics inogona kugadzirwa nekushandura reshiyo yeyttria yakagadzikana zirconia (Y-TZP) mukati me alumina matrix uchishandisa inopisa isostatic kudzvanya, kukwidziridza kuoma-kutsemuka kusimba-kushanduka kwesimba musanganiswa izvo zvinoguma zvisingaenzaniswi necyclic kuneta kuramba kunopfuura yakanyanya advanced technical ceramics..
Metastable Y-TZP mune alumina matrix inoguma mukuumbwa kwe tetragonal-monoclinic shanduko yechikamu agglomerates iyo inowedzera kuomarara kwekupwanyika kuburikidza nechikamu shanduko kuoma. (Clausen 1976). Zvichida kuyambuka mitswe, aya ekuchinja agglomerates anomanikidza iyo zone pamberi pekutsemuka kumberi uye kuderedza kufambira mberi kwayo, pakupedzisira kuwedzera kuomarara kwekutsemuka.
Ichi chimiro chenyama chakatungamira mukusikwa kwealumina-zirconia macomposites akadai seBIOLOX Delta., yakashandiswa zvakanyanya kune yakazara hudyu inotsiviwa uye zvimwe zvinotakura-zvinotakura nhengo dzemapfupa. Iyi ceramic biomaterial inoratidzira yakasarudzika kupfeka kuramba, makemikari inertness pakamuri tembiricha, thermal shock resistance uye yakanakisa makemikari inertness pane ese tembiricha.
Corrosion Resistance
Kemikari inert uye inopesana nekupisa kwakanyanya uye kupfeka, inopa kushanda kwepamusoro kuenzaniswa ne 99 alumina ceramics uye inodhura-inoshanda zvakare.
Zirconia zvakare inozvirumbidza inoshamisa kusimba simba, flexural uye elasticity zvivakwa uye biocompatibility – zvichiita kuti ive yakanakira kushandiswa kwekurapa sekutsiva hudyu. Nekuda kwekuchinja kuomarara pasi pekunetseka mamiriro, zirconia particles inoshanduka kubva kune metastable tetragonal fomu kuita monoclinic fomu, kubatsira kuvhara mitswe zvinobudirira uku uchiwedzera kuomarara kwekutsemuka.
CeramTec (Biolox Delta) inotengeserana nealumina-zirconia composite uko isina kugadzikana zirconia inoramba iri muchikamu chetetragonal kugadzirisa shanduko iyi uye nekupa muromo wekutsemuka nekutsemuka., kuvandudza kuoma kwealuminium matrix. Zirconia yemukati yezvinhu inogona kushandurwa kuburikidza nekugadzirira hupfu uye densification maitiro.
Thermal Shock Resistance
Zirconia yakawedzerwa kune yekutanga alumina matrix panguva yekupisa inogona kuwedzera zvakanyanya kusimba kwayo uye kuoma, kugadzira iyo inozivikanwa seZTA (Zirconia Toughened Alumina), inodarika yakajairwa alumina ceramics mune zvese zvemakanika uye kupfeka maapplication.
Zirconia toughened alumina inozivikanwa nekuda kwayo yakasarudzika zvinhu senge yakanyanya kupisa kuoma uye simba rekubvutwa., makemikari inertness pakamuri tembiricha, yakaderera thermal kuwedzera mwero uye yakanakisa thermal shock resistance – yakanaka zvivakwa zvekugaya pamwe nekupfeka zvikamu zvinoda kutonhora michina.
CeramTec inotengesa ZTA inodaidzwa kuti Biolox delta inoratidzira alumina matrix ane akaparadzirwa zvimedu zveY-TZP. (17 uremu/wt%) uye strontium aluminate maplatelet (0.5 uremu/wt%), kupa musanganiswa unoshanda we tetragonal-to-monoclinic chikamu chekushandura masisitimu uye crack deflection masisitimu kuti ape kusimba kwakavandudzika., izvo zvinoita kuti izvi zvive zvakanaka kune ekutanga THA maitiro pane yevakadzi inobereka nzvimbo.
Magetsi Insulation
Zirconia-yakaomeswa alumina inogona kumira kutyisa kwekushisa pasina kutsemuka kana kutyora pasi pekuchinja kamwe kamwe kwekushisa., nekuda kweakapararira alumina zvimedu zvakapararira mukati me matrix ayo anotora simba rekupisa uye kugadzira compression stress inodzivirira kuputsika..
Alumina-zirconia ceramic yakanyanya kusimba kupfuura iyo yakachena zirconia inofananidzira, zvichiita kuti zvive zvakanaka kune magetsi ekudzivirira kushandiswa. Uyezve, kuderera kwayo kwekuwedzera kwekushisa kupfuura zirconia kunoita kuti ive yakakodzera kune zvikamu zvinoda kutonhora.
Shanduko yekuomesa yeAlumina-zirconia composite inopa mamwe mabhenefiti; here, zirconia zviyo mualumina matrix zvinopinda muchikamu chetastable apo zviyo zvavo zvinoshandurwa kubva kune tetragonal kuenda kune monoclinic zvimiro., nokudaro kuderedza kushushikana-kunokonzerwa nekutsemuka nekuwedzera kupikisa kurwisa abrasion uye kukanganisa. Alumina yakaomeswa zirconia inowanzoitika kuburikidza nepyrophoric reaction inosanganisira Zirconium(IV) oxide octahydrate, Aluminium Nitrate Nanohydrate Triethylamine uye HNO3(Nitric Acid); kuwedzera hukuru hwezvimedu hunowedzera rubatsiro kupararira kwezviyo zvemetastable zirconia.