I-Sintering yonyango lobushushu olufakwe kwi-powder compact ukwenzela ukunika amandla kunye nokunyaniseka.Iqondo lobushushu elisetyenziselwa ukuntywila lingaphantsi kwendawo yokunyibilika yeyona nto iphambili yeMathiriyeli yePowder Metallurgy.

Emva kokudibanisa, amaqhekeza angabamelwane abanjwe kunye ne-welds ebandayo, enika i-compact ngokwaneleyo "amandla aluhlaza" ukuba aphathwe.Kwiqondo lokushisa elitshisayo, iinkqubo zokusabalalisa zibangela ukuba iintamo zenze kwaye zikhule kula manqaku oqhagamshelwano.

Zimbini izandulela eziyimfuneko phambi kokuba le "solid state sintering" yenzeke:
1. Ukususwa kwe-lubricant ecinezelayo ngokufuduka kunye nokutshiswa kwemiphunga
I-2.Ukunciphisa i-oxides yomhlaba kwi-powder particles kwi-compact.

La manyathelo kunye nenkqubo ye-sintering ngokwayo ngokubanzi iphunyezwa kwisithando somlilo esinye, esiqhubekayo ngokukhetha ngobulumko kunye nokwahlulwa kwe-atmosphere yesithando somlilo kunye nokusebenzisa iprofayili efanelekileyo yobushushu kulo lonke iziko.

Sinter ukuqina

Amaziko okupholisa akhoyo anokusebenzisa amazinga okupholisa okukhawulezileyo kwindawo yokupholisa kwaye amanqanaba ezinto eziphathekayo aphuhlisiwe anokutshintsha abe yi-martensitic microstructures kula mazinga okupholisa.Le nkqubo, kunye nonyango olulandelayo, lubizwa ngokuba yi-sintering harding, inkqubo evele, kwiminyaka yakutshanje, ineendlela eziphambili zokuphucula amandla e-sintered.

Ulwelo oludlulayo lwesigaba sintering

Kwi-compact equlathe kuphela amasuntswana omgubo wentsimbi, inkqubo eyomeleleyo ye-sintering iyakwenza ukucutheka okuthile kocweyo njengoko iintamo ezitshisayo zikhula.Nangona kunjalo, isenzo esiqhelekileyo esinezixhobo ze-PM ye-ferrous kukwenza ukongezwa komgubo wobhedu ococekileyo ukudala isigaba solwelo esidlulayo ngexesha lokutshiza.

Kwiqondo lokushisa elitshisayo, ubhedu luyanyibilika kwaye emva koko lusasazeke kwi-iron powder particles edala ukudumba.Ngokukhethwa ngokucokisekileyo komxholo wobhedu, kunokwenzeka ukulungelelanisa oku kuvuvukala ngokubhekiselele kwi-shrinkage yendalo ye-iron powder skeleton kunye nokubonelela ngezinto ezingaguqukiyo kwimilinganiselo yonke ngexesha le-sintering.Ukongezwa kobhedu kukwabonelela ngesisombululo esiluqilima esiluncedo.

Ulwelo olusisigxina lwesigaba sintering

Kwizinto ezithile, ezifana ne-cemented carbides okanye i-hardmetals, i-sintering mechanism ebandakanya ukuveliswa kwesigaba sesigxina solwelo sisetyenziswa.Olu hlobo lwe-liquid phase sintering lubandakanya ukusetyenziswa kwe-additive to powder, eya kunyibilika phambi kwesigaba se-matrix kwaye siza kudala into ebizwa ngokuba yi-binder phase.Inkqubo inezigaba ezithathu:

Uhlengahlengiso
Njengoko ulwelo lunyibilika, isenzo se-capillary siya kutsalela ulwelo kwiipores kwaye kubangele ukuba iinkozo zilungelelaniswe ngendlela elunge ngakumbi yokupakisha.

Isisombululo-imvula
Kwiindawo apho uxinzelelo lwe-capillary luphezulu, ii-athomu ziya kungena kwisisombululo kwaye emva koko zigqithise kwiindawo ezinomlinganiselo ophantsi weekhemikhali apho amasuntswana angasondeli okanye adibane.Oku kubizwa ngokuba yi-contacting flattening kwaye igxininise inkqubo ngendlela efana ne-corn boundary diffusion kwisimo esiqinileyo sintering.Ukuvuthwa kwe-Ostwald kuya kwenzeka kwakhona apho amasuntswana amancinci aya kungena kwisisombululo ngokukhethwayo kwaye adlule kumasuntswana amakhulu akhokelela kuxinaniso.

Ukuxinana kokugqibela
Uxinaniso lothungelwano oluqinileyo lwamathambo, intshukumo yolwelo ukusuka kwimimandla epakishwe ngokufanelekileyo ukuya kwiipores.Ukuze isigxina sesigaba solwelo sisebenze, isigaba esikhulu kufuneka ubuncinane sinyibilike kancinane kwisigaba solwelo kwaye isidibanisi “sesibophelelo” kufuneka sinyibilike phambi kokuba kwenzeke nakuphi na ukufeketha okukhulu kothungelwano lwenxalenye eqinileyo, kungenjalo uhlenga-hlengiso lweenkozo aluyi kwenzeka.