Mhedzisiro ye sintering pane zvivakwa zve zirconia ceramics
Serudzi rweceramic material, zirconium ine simba rakakwirira, kuoma kwakakwirira, kumira kwakanaka kupfeka, asidhi uye alkali kuramba, kupisa kwepamusoro uye zvimwe zvakanaka. Pamusoro pekushandiswa zvakanyanya mundima yeindasitiri, nekusimbaradza kwakasimba kweindasitiri yemazino mumakore achangopfuura, zirconia ceramics zvave zvakanyanya zvinogona kugadzirwa zvemazino uye zvakakwezva kutarisisa kwevaongorori vazhinji.
Kuita kwe zirconia ceramics kuchakanganiswa nezvinhu zvakawanda, nhasi isu tinotaura nezvekukanganisa kwekupisa pane zvimwe zvinhu zve zirconia ceramics.
Sintering nzira
Iyo yetsika sintering nzira ndeyekupisa muviri kuburikidza nekupisa kwemwaranzi, kupisa conduction, kupisa convection, kuitira kuti kupisa kunobva pamusoro pe zirconia kusvika mukati, asi iyo yekupisa conductivity ye zirconia yakaipisisa kupfuura yealumina uye zvimwe zvedongo zvinhu. Kuti udzivise kuputika kunokonzerwa nekushushikana kwekupisa, kukurumidza kupisa kwechinyakare kunononoka uye nguva yakareba, izvo zvinoita kuti kutenderera kwekugadzira zirconia kurebe uye mutengo wekugadzira wakakwira. Mumakore achangopfuura, kuvandudza tekinoroji ye zirconia, kupfupisa nguva yekugadzira, kudzikisa mutengo wekugadzira, uye kupa yakakwira kuita mazino zirconia ceramic zvinhu zvave kutariswa kwekutsvaga, uye microwave sintering pasina mubvunzo inzira inovimbisa sintering.
Inowanikwa kuti microwave sintering uye atmospheric pressure sintering haina mutsauko wakakura pane pesvedzero yesemi-permeability uye kupfeka kuramba. Chikonzero ndechekuti kuwanda kwe zirconia kunowanikwa ne microwave sintering kwakafanana neyakajairwa sintering, uye ese ari dense sintering, asi zvakanakira microwave sintering tembiricha yakaderera sintering, kukurumidza kukurumidza uye pfupi sintering nguva. Nekudaro, tembiricha yekukwira kwemhepo yekumanikidza sintering inononoka, nguva yekunyura yakareba, uye nguva yese yekunyura ingangoita 6-11h. Kuenzaniswa neyakajairwa kudzvanywa sintering, microwave sintering inzira nyowani yekupisa, ine zvakanakira zvenguva pfupi yekupisa, kushanda kwakanyanya uye kuchengetedza simba, uye inogona kuvandudza microstructure yemakeramiki.
Dzimwe nyanzvi dzinotendawo kuti zirconia mushure meiyo microwave sintering inogona kuchengetedza yakawanda metastable tequartet chikamu, pamwe nekuti microwave inokurumidza kupisa inogona kuwana kukurumidza densification yechinhu pakadzika tembiricha, saizi yezviyo idiki uye yakawanda yunifomu pane iyo yakajairwa kumanikidza sintering, yakaderera kupfuura. Iyo yakakosha chikamu shanduko saizi ye t-ZrO2, iyo inobatsira kuchengetedza zvakanyanya sezvinobvira mu metastable mamiriro pakupisa kwekamuri, kuvandudza kusimba uye kuoma kwezvinhu zveceramic.
Kaviri sintering maitiro
Compact sintered zirconia ceramics inogona kungogadziriswa nemery yekucheka maturusi nekuda kwekuoma kwakanyanya uye simba, uye mutengo wekugadzirisa wakakwira uye nguva yakareba. Kuti ugadzirise matambudziko ari pamusoro apa, dzimwe nguva zirconia ceramics ichashandiswa kaviri sintering process, mushure mekuumbwa kweceramic body uye yekutanga sintering, iyo CAD/CAM amplification machining kune yaunoda chimiro, uyezve kunyura kune yekupedzisira sintering tembiricha kuita. zvinhu zvakazara dense.
Inowanikwa kuti maviri sintering maitiro achachinja sintering kinetics ye zirconia ceramics, uye ichave nemhedzisiro pane sintering density, mechanical properties uye microstructure ye zirconia ceramics. Iyo yemagetsi zvimiro zvemachinable zirconia ceramics sintered kamwe dense zviri nani pane izvo zvakasimwa kaviri. Iyo biaxial kukotama simba uye kutsemuka kuomarara kweiyo machinable zirconia ceramics yakanyudzwa kamwe chete compact yakakwira kupfuura iyo yakasimwa kaviri. Iyo yekutyoka modhi yeprimary sintered zirconia ceramics ndeye transgranular/intergranular, uye kurohwa kwekupwanya kwakati twasa. Iyo yekutyoka modhi yekaviri sintered zirconia ceramics inonyanya kutsemuka pakati pegranular, uye maitiro ekuparuka anowedzera kushungurudza. Izvo zvimiro zvecomposite fracture mode zviri nani pane yakapusa intergranular fracture mode.
Sintering vacuum
Zirconia inofanirwa kunyungudutswa munzvimbo yevacuum, mukuita sintering inoburitsa huwandu hukuru hwemabhuru, uye munzvimbo yevacuum, mabhubhu ari nyore kuburitsa kubva kune yakanyungudutswa yemuviri weporcelain, inovandudza kuwanda kwe zirconia, nekudaro kuwedzera semi-permeability uye mechanical properties ye zirconia.
Kupisa mwero
Mune sintering process ye zirconia, kuitira kuti uwane kuita kwakanaka uye zvinotarisirwa mhedzisiro, yakaderera yekupisa mwero inofanira kutorwa. Iyo yakakwirira yekupisa inoita kuti kupisa kwemukati kwe zirconia kusaenzana painosvika tembiricha yekupedzisira sintering, zvichitungamira pakuonekwa kwekutsemuka uye kuumbwa kwepores. Zvigumisiro zvinoratidza kuti nekuwedzera kwekupisa kwekushisa, nguva yecrystallization ye zirconia crystals inopfupiswa, gasi pakati pemakristasi haigoni kubudiswa, uye porosity mukati mezirconia crystals inowedzera zvishoma. Nekuwedzera kwekupisa kwekushisa, chikamu chiduku chemonoclinic crystal phase chinotanga kuvapo mu tetragonal phase ye zirconia, iyo inokanganisa maitiro emagetsi. Panguva imwecheteyo, nekuwedzera kwekupisa kwekupisa, zviyo zvichave zvakasvibiswa, kureva, kugarisana kwezviyo zvakakura uye zviduku zviri nyore. Kupisa kunononoka kunobatsira pakuumbwa kwezviyo zvakawanda, izvo zvinowedzera semipermeability ye zirconia.
Nguva yekutumira: Jul-24-2023