Common Sintering Zinyalala ndi Zoyambitsa

Chigawo chachikulu cha simenti carbide ndi yaying'ono tungsten carbide ufa wouma kwambiri. Cemented carbide ndi chinthu chomaliza chomwe chimapangidwa ndi zitsulo za ufa ndikuwotchedwa mu ng'anjo yopanda vacuum kapena ng'anjo yochepetsera haidrojeni. Njirayi imagwiritsa ntchito cobalt, nickel, kapena molybdenum monga binder. Sintering ndi gawo lofunikira kwambiri mu carbide yopangidwa ndi simenti. Njira yopangira sintering ndikuwotcha ufa wophatikizana ndi kutentha kwina, kuusunga kwa nthawi inayake, kenako kuziziritsa kuti mupeze zinthu zomwe zimafunikira. Njira yopangira sintering carbide ndizovuta kwambiri, ndipo ndizosavuta kutulutsa zinyalala za sintered ngati mwalakwitsa. Nkhaniyi ikamba za zinyalala za sintering wamba ndi zomwe zimayambitsa zinyalala.

1. Kusenda

Choyamba wamba sintering zinyalala ndi peeling. Peeling ndi pamene pamwamba pa simenti carbide kuonekera ndi ming'alu m'mphepete ndi zipolopolo warping. Komanso, zina zimawoneka zikopa zazing'ono zopyapyala ngati mamba a nsomba, ming'alu yophulika, ngakhale kuphwanya. Kupukuta kumachitika makamaka chifukwa cha kukhudzana kwa cobalt mu compact, ndiyeno mpweya wokhala ndi mpweya umatulutsa mpweya waulere mmenemo, zomwe zimapangitsa kuchepa kwa mphamvu ya m'deralo ya compact, zomwe zimapangitsa kuti peeling.

2. Mabowo

Chinthu chachiwiri chodziwika bwino cha sintering ndi pores zoonekeratu pamtunda wa simenti ya carbide. Mabowo omwe ali ndi ma microns oposa 40 amatchedwa pores. Chilichonse chomwe chingayambitse thovu chimayambitsa pores pamwamba. Komanso, pamene pali zosafunika mu sintered thupi kuti si yonyowa ndi chitsulo chosungunuka kapena sintered thupi ali ndi gawo lalikulu olimba ndi tsankho la madzi gawo zingachititse pores.

3. Mibulu

Mavuvu ndi pamene pali mabowo mkati mwa simenti ya carbide ndipo amachititsa ziphuphu pamwamba pa zigawo zofanana. Chifukwa chachikulu cha thovu ndi chakuti thupi la sintered lili ndi mpweya wambiri. Mpweya wambiri umaphatikizapo mitundu iwiri.

4. Kapangidwe kosagwirizana komwe kumachitika chifukwa cha kusakaniza ufa wosiyanasiyana.

5. Kusintha

Kusakhazikika kwa thupi la sintered kumatchedwa deformation. Zifukwa zazikulu zowonongeka ndi izi: kugawa kachulukidwe ka compacts si yunifolomu; thupi sintered akusowa kwambiri mu carbon kwanuko; kukweza bwato sikuli kwanzeru, ndipo mbale yam'mbuyo imakhala yosagwirizana.

6. Black Center

Malo otayirira pamtunda wa alloy fracture amatchedwa black center. Chifukwa chapakati chakuda ndizomwe zili ndi kaboni wambiri kapena kaboni sikokwanira. Zinthu zonse zomwe zimakhudza mpweya wa sintered thupi zidzakhudza pakati wakuda wa carbide.

7. Ming'alu

Ming'alu ndi chinthu chodziwika bwino mu zinyalala za simenti za carbide. Pali mitundu iwiri ya ming'alu, imodzi ndi ming'alu ya compression, ndipo ina ndi ming'alu ya okosijeni.

8. Kuwotcha kwambiri

Pamene kutentha kwa sintering kuli kwakukulu kwambiri kapena nthawi yogwira ndi yaitali kwambiri, mankhwalawa adzawotchedwa kwambiri. Kuwotcha kwambiri kwa mankhwalawa kumapangitsa kuti mbewuzo zikhale zowonjezereka, ma pores amawonjezeka, ndipo katundu wa alloy amachepetsa kwambiri. Kuwala kwazitsulo zazitsulo zopanda moto sizowonekera, ndipo zimangofunika kuthamangitsidwanso.