Sintering ndi chithandizo cha kutentha chomwe chimagwiritsidwa ntchito ku compact powder kuti apereke mphamvu ndi kukhulupirika.Kutentha komwe kumagwiritsidwa ntchito ngati sintering kumakhala pansi pa malo osungunuka a Powder Metallurgy material.

Pambuyo pophatikizana, tinthu tating'ono ta ufa timagwiridwa ndi ma weld ozizira, omwe amapereka "mphamvu yobiriwira" yokwanira kuti igwire.Pa kutentha kwa sintering, njira zoyatsirana zimapangitsa makosi kupanga ndikukula pamalo olumikizana awa.

Pali zoyambira ziwiri zofunika izi "solid state sintering" izi zisanachitike:
1.Kuchotsa mafuta oponderezedwa ndi mpweya ndi kutentha kwa nthunzi
2.Kuchepetsa kwa oxides pamtunda kuchokera ku ufa wa particles mu chophatikizana.

Masitepe awa ndi njira yowotchera yokha nthawi zambiri imatheka mu ng'anjo imodzi, mosalekeza mwa kusankha mwanzeru komanso kuyika madera a ng'anjoyo komanso kugwiritsa ntchito mawonekedwe oyenera kutentha mu ng'anjo yonseyo.

Sinter kuumitsa

Zotenthetsera za Sintering zilipo zomwe zitha kugwiritsa ntchito kuziziritsa kwachangu m'malo ozizira ndipo magawo azinthu apangidwa omwe amatha kusintha kukhala ma martensitic microstructures pamitengo yozizirira iyi.Njirayi, pamodzi ndi chithandizo chotsatira cha kutentha, chimadziwika kuti sintering harding, ndondomeko yomwe yatuluka, m'zaka zaposachedwa, ili ndi njira zotsogola zowonjezera mphamvu za sintered.

Transient madzi gawo sintering

Mu chophatikizika chomwe chili ndi tinthu tating'ono ta chitsulo, njira yolimba ya sintering imatha kupangitsa kuti khosi la sintering likhale lochepa kwambiri.Komabe, chizolowezi chodziwika ndi zida za ferrous PM ndikuwonjezera ufa wabwino wamkuwa kuti apange gawo lamadzi losakhalitsa panthawi ya sintering.

Pa kutentha sintering, mkuwa amasungunuka ndiyeno diffuses mu chitsulo ufa particles kupanga kutupa.Mwa kusankha mosamala zinthu zamkuwa, ndizotheka kulinganiza kutupa uku motsutsana ndi kuwonongeka kwachilengedwe kwa mafupa a ufa wachitsulo ndikupereka zinthu zomwe sizisintha mu miyeso yonse panthawi ya sintering.Kuwonjezera mkuwa kumaperekanso zothandiza olimba njira kulimbikitsa zotsatira.

Okhazikika madzi gawo sintering

Pazinthu zina, monga cemented carbides kapena hardmetals, njira yopangira sintering yomwe imaphatikizapo kupanga gawo lamadzimadzi lokhazikika limagwiritsidwa ntchito.Mtundu uwu wa sintering wamadzimadzi umaphatikizapo kugwiritsa ntchito chowonjezera cha ufa, chomwe chidzasungunuka pamaso pa gawo la masanjidwewo ndipo nthawi zambiri limapanga gawo lotchedwa binder.Njirayi ili ndi magawo atatu:

Kukonzanso
Madziwo akasungunuka, capillary action imakokera madziwo mu pores ndikupangitsa kuti njere zisinthenso kukhala zolongedza bwino.

Yankho - mvula
M'madera omwe kupanikizika kwa capillary kuli kwakukulu, maatomu amatha kulowa mu njira yothetsera vutoli ndiyeno amalowa m'madera omwe ali ndi mphamvu zochepa za mankhwala kumene tinthu tating'ono tating'ono kapena talumikizana.Izi zimatchedwa kukhudzana flattening ndipo densifies dongosolo mu njira yofanana ndi tirigu malire diffusion mu zolimba state sintering.Kucha kwa Ostwald kudzachitikanso pomwe tinthu tating'ono ting'onoting'ono titha kulowa m'njira mwamakonda ndikuthira pa tinthu tating'onoting'ono tomwe timayambitsa kusamvana.

Kuchulukana komaliza
Kuchulukana kwa netiweki yolimba ya chigoba, kusuntha kwamadzi kuchokera kumadera odzaza bwino kupita ku pores.Kuti sintering yokhazikika yamadzimadzi ikhale yothandiza, gawo lalikulu liyenera kukhala losungunuka pang'ono mu gawo lamadzimadzi ndipo chowonjezera cha "binder" chiyenera kusungunuka musanayambe kusungunuka kwakukulu kwa tinthu tating'onoting'ono tolimba, apo ayi kukonzanso mbewu sikungachitike.