Yenziwe ngeCemented Carbide

I-carbides ene-cemented yenziwe ngokuxuba i-tungsten carbide kunye ne-cobalt kumlinganiselo othile, icinezela kwiimo ezahlukeneyo, kwaye emva koko i-semi-sintering.Le nkqubo ye-sintering idla ngokuqhutyelwa kwi-vacuum furnace.Ifakwa kwiziko lokufunxa kubushushu obumalunga ne-1,300 ukuya kwi-1,500 ngokukaCelsius.

Ibha enemilo ekhethekileyo

I-Sintered hard alloy forming kukucofa umgubo kwi-billet, kwaye emva koko ungene kwiziko lokufudumeza kwiqondo lobushushu elithile (ubushushu be-sintering), kwaye ugcine ixesha elithile (ubambe ixesha), kwaye emva koko uphole phantsi, ukuze ufumane ukusebenza okufunekayo imathiriyeli ye-alloy eqinile.

Inkqubo ye-samente ye-carbide sintering inokohlulwa ibe ngamanqanaba amane asisiseko:

I-1: Ukususwa kwe-arhente yokubumba kunye nenqanaba lokudubula kwangaphambili, kweli nqanaba umzimba we-sintered utshintsha ngolu hlobo lulandelayo:

Ukususwa kwe-arhente yokubumba, kwinqanaba lokuqala le-sintering kunye nokunyuka kweqondo lokushisa, i-arhente yokubumba ngokuthe ngcembe ibola okanye ibe ngumphunga, ingabandakanyi umzimba odibeneyo, kwangaxeshanye, i-arhente yokubumba ngaphezulu okanye ngaphantsi kwi-carburizing yomzimba, isixa se-carburizing siya kutshintsha. kunye nodidi lwe-arhente yokubumba, inani kunye nenkqubo yokucoca eyahlukileyo.

I-oxides yendawo yomgubo iyancipha.Kwiqondo lobushushu elitshisayo, ihydrogen inokunciphisa iioksidi zecobalt kunye netungsten.Ukuba i-ejenti yokwenza isuswe kwi-vacuum kwaye i-sintered, i-carbon-oxygen reaction ayinamandla.Ukuxinzezeleka koqhagamshelwano phakathi kweengqungquthela zepowder kupheliswa ngokuthe ngcembe, i-powder yensimbi edibeneyo iqala ukubuyisela kwaye iphinde ihlaziye, ukusabalalisa komhlaba kuqala ukwenzeka, kwaye amandla ebhloko aphuculwe.

2: isigaba esiqinileyo se-sintering (800℃- ubushushu be-eutectic)

Kwiqondo lobushushu phambi kokubonakala kwesigaba solwelo, ukongeza ekuqhubekeni kwenkqubo eyenzeka kwisigaba sangaphambili, ukusabela okuqinileyo kunye nokusasazwa kuyaqina, ukuhamba kweplastiki kuphuculwe, kwaye umzimba odibeneyo ubonakala ucutheka.

3: inqanaba lolwelo sintering (ubushushu eutectic — sintering ubushushu)

Xa kukho isigaba samanzi kumzimba we-sintered, i-shrinkage igqitywe ngokukhawuleza, kwaye emva koko utshintsho lwe-crystallization lwenzeka, lwenza i-microstructure eyisiseko kunye nesakhiwo se-alloy.

4: inqanaba lokupholisa (ubushushu be-sintering - ubushushu begumbi)

Ngeli nqanaba, i-microstructure kunye nesigaba sokubunjwa kwe-alloy inguqu kunye neemeko zokupholisa ezahlukeneyo, ezingasetyenziselwa ukutshisa unyango lwe-carbide ene-cemented ukuphucula iimpawu zayo zomzimba kunye noomatshini.