Menene abubuwan da ke shafar tsarin densification sintering na siminti carbide

The sintering nasiminti carbideshine ruwa lokaci sintering, watau re- bonding lokaci ne a cikin ruwa lokaci.Ana dumama billet ɗin da aka matse zuwa 1350°C-1600°C a cikin tanderun daɗaɗɗe.Matsakaicin raguwar billet ɗin da aka matse yayin sintering shine kusan 18% kuma raguwar ƙarar yana kusa da 50%.Madaidaicin ƙimar raguwa ya dogara da girman ƙwayar foda da abun da ke ciki na gami.

Sintering nasiminti carbidene mai hadaddun physicochemical tsari, wanda ya hada da plasticizer kau, degassing, m lokaci sintering, ruwa lokaci sintering, alloying, densification, rushe hazo da sauran matakai.Billet ɗin da aka matse yana ɓarna ƙarƙashin ƙayyadaddun sharuɗɗa don samar da samfur tare da takamaiman sinadarai, tsari, kaddarori da siffa da girma.Waɗannan sharuɗɗan tsari sun bambanta da yawa dangane da naúrar sintiri.

Cimemented carbide vacuum sintering wani tsari ne wanda ake yin sintering a kasa da 1 atm (1 atm = 101325 Pa).Sintering a ƙarƙashin yanayi mara kyau yana rage girman haƙarƙarin ƙima ta hanyar iskar gas ɗin da aka tallata akan foda da kuma iskar gas a cikin rufaffiyar pores, wanda ke ba da gudummawa ga tsarin watsawa da haɓakawa, yana guje wa halayen da ke tsakanin ƙarfe da wasu abubuwa a cikin yanayi yayin sintering tsari, kuma zai iya muhimmanci inganta wettability na ruwa danko lokaci da wuya lokaci, amma injin sintering ya kamata kula don hana evaporation asarar cobalt.Vacuum sintering ana iya raba gabaɗaya zuwa matakai huɗu, watau matakin cire filastik, matakin riga-kafi, matakin zafin jiki mai girma da matakin sanyaya.
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 barbashi ƙarƙashin aikin zafi kuma yana tserewa daga billet ɗin gabaɗaya.Plasticizer a cikin billet yana zafi kuma ya tsere daga billet.Tsayar da babban matakin vacuum yana taimakawa wajen sakin gas da kuma tserewa.Daban-daban nau'ikan filastik suna da kaddarorin daban-daban lokacin da aka yi zafi, don haka aikin cire filastik ya kamata a haɓaka bisa ga takamaiman yanayi.
Ya kamata a ƙayyade tsarin cire filastik bisa ga takamaiman yanayin gwajin.Babban zafin jiki na plasticizer yana ƙasa da 550 ℃.

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 ragowar a cikin gami, ko da matsi sintering, yana da wuya a kawar.A daya hannun, gaban hadawan abu da iskar shaka zai yi tsanani tasiri wettability na ruwa lokaci zuwa wuya lokaci da kuma ƙarshe rinjayar densification tsari na cimined carbide.Kafin lokacin ruwa ya bayyana, yakamata a zubar da shi sosai kuma yakamata a yi amfani da mafi girman yuwuwar injin.
Matsakaicin zafin jiki da lokacin ɓacin rai sune mahimman sigogin tsari don ƙaddamar da billet, samuwar tsarin kamanni da kuma 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.