Menene matakai guda huɗu a cikin tsarin vacuum sintering na Cemented Carbid

Siminti carbideVacuum sintering wani tsari ne wanda ake yin sintering a matsa lamba ƙasa da yanayin yanayi.Wannan tsari ya haɗa da kau da plastaizer, degassing, m lokaci sintering, ruwa lokaci sintering, alloying, densification, da rushe hazo.Bari mu kalli manyan matakai guda huɗu na siminti na injin carbide vacuum sintering:

① Matakin cire filastik

Matakin cire filastik yana farawa daga zafin jiki kuma yana tashi zuwa kusan 200 ° C.Gas ɗin da aka haɗa a saman ɓangarorin foda a cikin billet yana rabu da saman ɓangarorin da zafi kuma yana tserewa daga billet ɗin gabaɗaya.Ana dumama robobi a cikin billet don tserewa daga billet.Tsayar da babban matakin vacuum yana taimakawa wajen sakin gas da kuma tserewa.Daban-daban nau'ikan filastik suna fuskantar canje-canjen zafi a cikin aikin ya bambanta, haɓakar aiwatar da cirewar filastik ya kamata a ƙaddara bisa ga takamaiman yanayi na gwaji.Babban zafin jiki na plasticizer yana ƙasa da 550 ℃.

② Matakin da aka riga aka kora

Pre-sintering mataki yana nufin high zafin jiki sintering kafin pre-sintering, sabõda haka, da sinadaran oxygen a cikin foda barbashi da carbon rage dauki don samar da carbon monoxide gas barin latsa billet, idan wannan gas ba za a iya cire a lokacin da ruwa lokaci bayyana. zai zama rufaffiyar pore saura a cikin gami, ko da idan an matsa sintering, yana da wuya a kawar.A gefe guda, kasancewar iskar shaka zai yi tasiri sosai ga wettability na ruwa lokaci zuwa lokaci mai wuya kuma a ƙarshe ya shafi tsarin densification nasiminti carbide.Kafin lokacin ruwa ya bayyana, yakamata a zubar da shi sosai kuma yakamata a yi amfani da mafi girman yuwuwar injin.

③ Matsayi mai girman zafin jiki

Matsakaicin zafin jiki da lokacin raguwa sune mahimman sigogin tsari don ƙididdige billet, samuwar tsarin kamanni da samun abubuwan da ake buƙata.Matsakaicin zafin jiki da lokacin raguwa ya dogara da abun da ke ciki na gami, girman foda, ƙarfin niƙa na cakuda da sauran abubuwan, kuma ana sarrafa su ta hanyar ƙirar gabaɗayan kayan.

④ Matakin sanyaya

Matsayin sanyaya shine inda adadin sanyaya ya shafi abun da ke ciki da tsarin tsarin haɗin gwiwa na gami kuma yana haifar da damuwa na ciki.Adadin sanyaya yakamata ya kasance cikin yanayin sarrafawa.Sintering zafi isostatic latsawa wani sabon sintering dabara ne, kuma aka sani da low-matsa lamba sintering, a cikin abin da samfurin da aka matsa tare da wani matsa lamba na iskar gas don inganta densification a karkashin yanayin cewa degassing aka kammala, da pores a saman da guga man billet. an rufe, kuma lokacin ɗaure ya kasance mai ruwa.