Wopangidwa ndi Cemented Carbide

Ma carbide opangidwa ndi simenti amapangidwa posakaniza tungsten carbide ndi cobalt mu chiŵerengero china, kukakamiza mu maonekedwe osiyanasiyana, ndiyeno semi-sintering.Izi sintering ndondomeko zambiri ikuchitika mu ng'anjo vacuum.Imatenthedwa mu ng'anjo yopanda kanthu pa kutentha kwa pafupifupi 1,300 mpaka 1,500 digiri Celsius.

Bar yooneka ngati yapadera

Sintered hard alloy kupanga ndi kukanikiza ufa mu billet, ndiyeno mu sintering ng'anjo Kutentha kwa kutentha kwina (sintering kutentha), ndi kusunga nthawi inayake (kugwira nthawi), ndiyeno kuzirala pansi, kuti apeze ntchito zofunika. zinthu zolimba alloy.

Njira yopangira simenti ya carbide ikhoza kugawidwa m'magawo anayi:

1: Kuchotsedwa kwa opangira ndi siteji yowombera, panthawiyi thupi la sintered limasintha motere:

Kuchotsedwa kwa chitsulo chowumba, pa gawo loyambirira la sintering ndi kukwera kwa kutentha, kuumba wothandizila pang'onopang'ono kuwola kapena kusungunuka, kupatula thupi lopangidwa ndi sintered, panthawi imodzimodziyo, kuumba wothandizira kwambiri kapena kuchepera kwa sintered body carburizing, carburizing kuchuluka kudzasintha. ndi mtundu wa wothandizila akamaumba, chiwerengero ndi osiyana sintering ndondomeko.

Ma oxides apamwamba a ufa amachepetsedwa.Pa kutentha kwa sintering, haidrojeni imatha kuchepetsa ma oxide a cobalt ndi tungsten.Ngati chopangiracho chichotsedwa mu vacuum ndi sintered, mpweya wa okosijeni umakhala wopanda mphamvu.Kupsinjika kwapakati pakati pa tinthu tating'onoting'ono kumachotsedwa pang'onopang'ono, chitsulo chomangira chitsulo chimayamba kuchira ndikuyambiranso, kufalikira kwamadzi kumayamba kuchitika, ndipo mphamvu ya chipikayo imakula bwino.

2: olimba gawo sintering siteji (800 ℃ - kutentha eutectic)

Pa kutentha pamaso pa maonekedwe a madzi gawo, kuwonjezera kupitiriza ndondomeko zikuchitika m`mbuyomu siteji, olimba anachita ndi mayamwidwe anakulirakulira, pulasitiki otaya ndi kumatheka, ndi sintered thupi amaoneka shrinkage zoonekeratu.

3: madzi gawo sintering siteji (eutectic kutentha - sintering kutentha)

Pakakhala gawo lamadzimadzi m'thupi la sintered, shrinkage imatha msanga, ndiyeno kusintha kwa crystallization kumachitika, kupanga ma microstructure ndi kapangidwe ka aloyi.

4: siteji yozizira (kutentha kwa sintering - kutentha kwa chipinda)

Panthawi imeneyi, microstructure ndi gawo zikuchokera aloyi kusintha ndi zinthu zosiyanasiyana kuzirala, amene angagwiritsidwe ntchito kutentha mankhwala a simenti carbide kusintha thupi ndi makina katundu.