Tsarin masana'anta na abubuwan saka carbide

Tsarin masana'anta na siminti na carbide ba kamar siminti ko ƙarfe ba ne, wanda ake samu ta hanyar narkewar tama sannan a yi allura a cikin gyare-gyare, ko ƙirƙirar ta hanyar ƙirƙira, amma ƙwayar carbide (tungsten carbide powder, titanium carbide foda, foda tantalum carbide) zai zama kawai. narke lokacin da ya kai 3000 ° C ko sama. foda, da dai sauransu) ya yi zafi zuwa sama da digiri 1,000 don sa shi ya bushe. Don yin wannan haɗin gwiwar carbide mai ƙarfi, ana amfani da foda na cobalt azaman wakili na haɗin gwiwa. A karkashin aikin babban zafin jiki da matsa lamba, za a inganta alaƙar da ke tsakanin carbide da cobalt foda, ta yadda za a yi sannu a hankali. Ana kiran wannan lamarin sintering. Domin ana amfani da foda, wannan hanya ita ake kira powder metallurgy.

Dangane da tsarin masana'anta daban-daban na saka siminti carbide, yawan adadin kowane ɓangaren abubuwan saka siminti na siminti ya bambanta, kuma aikin ƙera kayan saka siminti shima ya bambanta.

Ana yin sintering bayan an kafa shi. Mai zuwa shine gaba dayan tsarin aikin sintering:

1) Danna tungsten carbide foda da kuma cobalt foda bisa ga siffar da ake bukata. A wannan lokacin ana haɗa ɓangarorin ƙarfe da juna, amma haɗuwa ba ta da ƙarfi sosai, kuma za a murƙushe su da ɗan ƙarfi.

2) Yayin da yawan zafin jiki na ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar cuta ta ƙarfafa hankali. A zafin jiki na 700-800 ° C, haɗuwa da barbashi har yanzu yana da rauni sosai, kuma har yanzu akwai raguwa da yawa tsakanin sassan, wanda za'a iya gani a ko'ina. Waɗannan ɓangarorin ana kiran su voids.

3) Lokacin da zafin jiki na dumama ya tashi zuwa 900 ~ 1000 ° C, ɓarna tsakanin barbashi suna raguwa, ɓangaren baƙar fata mai layi ya kusan ɓacewa, kuma babban ɓangaren baki kawai ya rage.

4) Lokacin da zafin jiki ya kusan kusan 1100 ~ 1300 ° C (wato, yawan zafin jiki na yau da kullun), ɓangarorin suna ƙara raguwa, kuma haɗin kai tsakanin barbashi yana da ƙarfi.

5) Lokacin da aka kammala aikin sintering, ƙwayoyin tungsten carbide a cikin ruwa ƙananan polygons ne, kuma ana iya ganin wani farin abu a kusa da su, wanda shine cobalt. Tsarin sintetan ruwa ya dogara ne akan cobalt kuma an rufe shi da barbashi na carbide tungsten. Girma da siffar barbashi da kauri na cobalt Layer sun bambanta sosai a cikin kaddarorin abubuwan shigar da carbide.