Ama-pores ngemuva kokuhlinzwa

I-carbide enosimende iwuhlobo lwenhlanganisela ehlanganisa i-tungsten elinganayo nekhabhoni, enobulukhuni eduze kwedayimane. I-carbide enosimende inokuqina okuphezulu kanye nokuqina okuphezulu ngesikhathi esifanayo. I-carbide enosimende yenziwa nge-powder metallurgy, futhi ukufakwa kwe-sintering kuyinqubo ebaluleke kakhulu ngesikhathi sokukhiqiza umkhiqizo we-carbide kasimende. Kulula ukubangela ama-pores ngemva kwe-tungsten carbide sintering uma ingalawulwa kahle. Kulesi sihloko, uzothola ulwazi mayelana nama-pores ngemuva kwe-tungsten carbide sintering.

I-tungsten carbide powder kanye ne-binder powder zixutshwe ngesilinganiso esithile. Khona-ke ingxube yempushana yenziwa icwecwe eliluhlaza ngemva kokugaya okumanzi emshinini wokugaya ibhola, ukufutha okomile, nokuhlanganisa. Ama-compact tungsten carbide aluhlaza afakwa esithandweni somlilo se-HIP.

Inqubo enkulu ye-sintering ingahlukaniswa ngezigaba ezine. Ukususwa kwe-ejenti yokubumba kanye nesiteji sangaphambi kwe-sintering, isigaba se-solid-phase sintering, isigaba se-liquid-phase sintering, kanye nesiteji sokupholisa se-sintering. Ngesikhathi sokushisa, izinga lokushisa likhuphuka kancane. Emafekthri, kunezindlela ezimbili ezijwayelekile zokuthi sintering. Enye i-hydrogen sintering, lapho ukwakheka kwezingxenye kulawulwa yi-phase reaction kinetics ku-hydrogen nokucindezela komkhathi. Futhi enye i-vacuum sintering, esebenzisa indawo ye-vacuum noma indawo encishisiwe. Ingcindezi yegesi ilawula ukwakheka kwe-carbide enosimende ngokunciphisa i-reaction kinetics.

Kuphela lapho abasebenzi belawula isigaba ngasinye ngokucophelela, imikhiqizo yokugcina ye-tungsten carbide ingathola i-microstructure efiselekayo kanye nokwakheka kwamakhemikhali. Amanye ama-pores angase abe khona ngemva kokugcoba. Esinye sezizathu ezibalulekile mayelana nezinga lokushisa le-sintering. Uma izinga lokushisa likhuphuka ngokushesha, noma izinga lokushisa le-sintering liphezulu kakhulu, ukukhula nokuhamba okusanhlamvu kuzobe kungalingani, okuholela ekukhiqizeni ama-pores. Esinye isizathu esibalulekile i-ejenti eyakhayo. I-binder kufanele isuswe ngaphambi kokushisa. Uma kungenjalo, i-ejenti eyenza i-volatilize ngesikhathi sokushisa kwe-sintering ekhulayo, okuzophumela kuma-pores.

Uma unentshisekelo emikhiqizweni ye-tungsten carbide futhi ufuna ulwazi olwengeziwe nemininingwane, UNGATHI XHUMANA NATHI ngocingo noma ngemeyili kwesokunxele, noma SITHUMELE IMEYILI ezansi nekhasi.