Powder sintering inosanganisira kusimudza tembiricha yegirinhi compact, (yakadzvanywa poda chikamu), kune imwe nhanho uye kuichengeta patembiricha iyoyo kwenguva yakati.Kupisa kwekupisa kunowanzova pakati pe70% ne90% yekunyungudika kwehupfu hwesimbi.Izvi zvinozoita kuti nzira dzekubatanidza dziitike pakati pehupfu hwakatsikirirwa pamwechete mukombuta.Kubatana mukati megirinhi kompakiti hakuna kusimba uye ichi chakadzvanywa chisina kupindirwa kazhinji chinongova nechimiro chakakwana chekutendeseka kuti ubatwe.Kubatana kunoitika panguva ye sintering kunosimbisa zvikuru chikamu.
Munguva yekupisa, zvimiro zvega zvega zvinopera uye zvinhu zvinoumba sehuwandu.Conventional sintering haizobvisi porosity yese muchikamu, zvisinei inoderedza porosity mberi.Pamusoro pekuderedzwa muhukuru, sintering inogona zvakare kuparadzanisa nzvimbo dzeyakabatana yakavhurika porosity mune yakasvibira compact.Idzi nzvimbo dziri dzoga dzinova dzakavharika porosity, sezvo dzakagurwa kubva kune kunze nharaunda.Sintering hunhu mukupisa kwezvimwe zvinowedzera muupfu izvo zvaive zvakakosha pamatanho ekutanga ekugadzirisa.Kubviswa kwezvinoumba hazvichadiwi semafuta, binders uye deflocculates, zvakakosha kuchengetedza kuchena kwezvinhu zvechigadzirwa chekupedzisira.Mukuwedzera pakuwedzera simba uye kuwanda kwezvinhu zvechikamu, sintering inowedzerawo ductility, thermal conductivity uye magetsi ekugadzirisa.Shrinkage ichaitika panguva yekupisa, asi ichaverengerwa kana zvinhu zvekugadzira zvinodzorwa.
Maitiro anokonzeresa kusungirirana panguva yekupisa akasiyana uye akaomarara.Iyo huru nzira iyo kubatana kunoitika kunoonekwa sekupararira, maitiro achasiyana zvichienderana nekugadzira maitiro ekugadzira uye hupfu maitiro.Dzimwe nzira dzinogona kuitika pamwe nekupararira ndeyekuyerera kwepurasitiki, recrystallization, kukura kwezviyo, fluid chikamu chekutakura zvinhu uye mhute chikamu chekutakura zvinhu.Maitiro emuviri emhando dzakasiyana dzekubatana angave akasiyana.Particle bonding nenzira mbiri dzakasiyana inoratidzwa pazasi.Iyo diffusion bonding inodzika chinhambwe pakati pezvimedu, ichideredza nzvimbo.Iyo chikamu chekutakura zvinhu chinowedzera zvinhu, uku ichichengeta zvimedu zvinhambwe zvakaparadzana.
Nzira dzekubatanidza panguva ye sintering dzakaoma uye dzakasiyana, zvisinei iyo huru yekufambisa iyo inogadzirisa iyi particle bonding inofungidzirwa kuderedzwa kwesimba nekuda kwekuderedzwa kwepamusoro nzvimbo.Hupfu hune nzvimbo yakakura yepasi huchava nesimba rekutyaira rakakwirira kune bonding uye kudzikisira kwesimba rinogoneka iri.
Alloying akasiyana simbi hupfu kunoitikawo panguva sintering.Sintering tembiricha inofanira kugara yakadzikira pane tembiricha yekunyunguduka yeimwe yezvikamu zvehupfu.Mune zvimwe zviitiko, sintering tembiricha iri pamusoro pekunyunguduka kwechimwe chezvigadzirwa asi pazasi pekunyungudika kwechimwe.Izvi zvinonzi liquid phase sintering.Liquid phase sintering inogona kubvisa porosity uye kuburitsa zvikamu zvine yakanakisa zvinhu zvinhu.
Nguva yekutumira: Mar-04-2017