Njira yopangira zinthu za carbide
Kupanga masamba opangidwa ndi simenti ya carbide sikufanana ndi kuponyera kapena chitsulo, komwe kumapangidwa ndi kusungunuka kwa ore kenako ndikulowetsa mu nkhungu, kapena kupanga popanga, koma ufa wa carbide (tungsten carbide powder, titanium carbide powder, tantalum carbide powder) sungunuka ikafika 3000 °C kapena kupitilira apo. ufa, ndi zina zotero) zotenthedwa kufika madigiri 1,000 Celsius kuti zisungunuke. Kuti mgwirizano wa carbide ukhale wolimba, ufa wa cobalt umagwiritsidwa ntchito ngati chomangira. Pansi pa kutentha kwakukulu ndi kupanikizika kwakukulu, mgwirizano pakati pa carbide ndi cobalt ufa udzakulitsidwa, kotero kuti pang'onopang'ono upangike. Chodabwitsa ichi chimatchedwa sintering. Chifukwa ufa umagwiritsidwa ntchito, njira imeneyi imatchedwa ufa wazitsulo.
Malinga ndi njira zosiyanasiyana zopangira zoyikapo simenti za carbide, kuchulukitsitsa kwa chigawo chilichonse cha zoyikapo simenti kumasiyana, komanso kagwiridwe kake ka zoyikamo zokhala ndi simenti zimasiyananso.
Sintering ikuchitika pambuyo kupanga. Zotsatirazi ndi njira yonse ya sintering:
1) Kanikizani ufa wosweka kwambiri wa tungsten carbide ndi ufa wa cobalt molingana ndi mawonekedwe ofunikira. Panthawiyi, zitsulo zazitsulo zimagwirizanitsidwa wina ndi mzake, koma kuphatikiza sikuli kolimba kwambiri, ndipo zidzaphwanyidwa ndi mphamvu pang'ono.
2) Pamene kutentha kwa tinthu tating'onoting'ono ta ufa kumawonjezeka, kuchuluka kwa kugwirizana kumalimbikitsidwa pang'onopang'ono. Pa 700-800 ° C, kuphatikiza kwa tinthu tating'onoting'ono kumakhalabe kosalimba kwambiri, ndipo pali mipata yambiri pakati pa tinthu tating'onoting'ono, tomwe titha kuwoneka paliponse. Ma voids awa amatchedwa voids.
3) Pamene kutentha kwa kutentha kumakwera kufika ku 900 ~ 1000 ° C, voids pakati pa tinthu tating'onoting'ono timachepa, mbali yakuda yakuda imatsala pang'ono kutha, ndipo gawo lalikulu lakuda limatsalira.
4) Pamene kutentha kumafika pang'onopang'ono 1100 ~ 1300 ° C (ndiko kuti, kutentha kwabwino kwa sintering), ma voids amachepetsedwa, ndipo mgwirizano pakati pa particles umakhala wamphamvu.
5) Pamene sintering ikamalizidwa, tungsten carbide particles mu tsamba ndi ma polygons ang'onoang'ono, ndipo chinthu choyera chimatha kuwoneka mozungulira iwo, chomwe ndi cobalt. Tsamba la sintered limakhazikitsidwa ndi cobalt ndipo limakutidwa ndi tinthu tating'ono ta tungsten carbide. Kukula ndi mawonekedwe a particles ndi makulidwe a cobalt wosanjikiza amasiyana kwambiri mu katundu wa carbide oika.