Umgubo weSintered

I-powder sintering ibandakanya ukuphakamisa ubushushu be-compact eluhlaza, (inxalenye yomgubo ocofelweyo), ukuya kwinqanaba elithile kwaye uyigcine kwiqondo lokushisa ixesha elithile.Ubushushu be-sintering ngokuqhelekileyo buphakathi kwe-70% kunye ne-90% yendawo yokunyibilika kwesinyithi somgubo.Oku kuya kubangela ukuba iindlela zokudibanisa zenzeke phakathi kwamaqhekeza e powder axinzelelwe kunye kwi-compact.Ukudibanisa ngaphakathi kwi-compact eluhlaza buthathaka kwaye le nxalenye ecinezelweyo engathinteliyo ihlala inengqibelelo eyaneleyo yolwakhiwo ekufuneka iphathwe.Ukubambana okwenzekayo ngexesha le-sintering kuyomeleza kakhulu inxalenye.

Ngexesha le-sintering, iinqununu zomntu ngamnye ziyanyamalala kwaye izinto eziphathekayo zifana nobunzima.I-sintering eqhelekileyo ayiyi kuphelisa yonke i-porosity kwinxalenye, nangona kunjalo iyanciphisa i-porosity ngakumbi.Ukongeza ekunciphiseni umthamo, i-sintering inokwahlula iindawo ze-porosity edibeneyo evulekileyo kwi-compact eluhlaza.Ezi ndawo zikwanti ziba yi-porosity evaliweyo, kuba zinqunyulwa kwindawo engaphandle.I-Sintering luphawu lokutshiswa kwezongezo kumgubo ebeziyimfuneko kwizigaba zokusetyenzwa kwangaphambili.Ukupheliswa kwezinto ezisisiseko azisafuneki njengezithambiso, izibophelelo kunye ne-deflocculates, kubalulekile ukugcina ukucoceka kwezinto zemveliso yokugqibela.Ukongeza ekunyuseni amandla kunye nokuxinana kwezinto zenxalenye, i-sintering iphinda ikhulise i-ductility, i-thermal conductivity kunye ne-electrical conductivity.I-Shrinkage iya kwenzeka ngexesha le-sintering, kodwa iya kubalwa xa izinto zenkqubo yokuvelisa zilawulwa.

Iinkqubo ezibangela ukudibanisa ngexesha le-sintering ziyahlukahluka kwaye zinzima.Indlela ephambili eyenziwa ngayo i-bonding ithathwa njengokusasazwa, iindlela ziya kuhluka ngokusekelwe kwizinto zenkqubo yokuvelisa kunye neempawu ze powder.Ezinye iindlela ezinokuthi zenzeke kunye nokusasazwa kukuhamba kweplastiki, ukumiliselwa kwakhona, ukukhula okuziinkozo, ukuthuthwa kwemathiriyeli yesigaba solwelo kunye nothutho lwemathiriyeli yesigaba somphunga.Iimpawu zomzimba zeentlobo ezahlukeneyo zokudibanisa zingahluka.Ukudityaniswa kwesuntswana ngeendlela ezimbini ezahlukeneyo kubonisiwe ngezantsi.I-diffusion bonding inciphisa umgama phakathi kwamaqhekeza, ukunciphisa indawo.Ukuthuthwa kwezinto zesigaba songeza izinto eziphathekayo, ngelixa ugcina amaqhekeza umgama ofanayo.

Iindlela zokubambisana ngexesha le-sintering ziyinkimbinkimbi kwaye zihluke, nangona kunjalo amandla okuqhubela phambili okuqhuba le ngqungquthela ye-particle ithathwa njengokunciphisa amandla ngenxa yokunciphisa indawo.Iipowda ezinommandla omkhulu womphezulu ziya kuba namandla okuqhuba aphezulu ekudibaneni kunye nokuthotywa kwamandla anokubakho.

Ukuxutywa kwee powders zetsimbi ezahlukeneyo nako kwenzeka ngexesha le-sintering.Ubushushu be-sintering kufuneka buhlale buphantsi kunobushushu obunyibilikayo obuncinci bendawo yomgubo.Kwezinye iimeko, ubushushu be-sintering bungaphezulu kwendawo yokunyibilika kwesinye sezixhobo kodwa ngaphantsi kwendawo yokunyibilika yenye.Oku kubizwa ngokuba yi-liquid phase sintering.I-Liquid phase sintering inokuphelisa i-porosity kwaye ivelise iinxalenye ezineempawu ezintle zezinto eziphathekayo.