UTungsten: Umphefumlo woShishino loMkhosi

Kwishishini lomkhosi, i-tungsten kunye neealloys zayo zinqabile kakhulu izixhobo zobuchule, ezithi ubukhulu becala zigqibe amandla omkhosi welizwe.

Ukuvelisa izixhobo zanamhlanje, ayinakuhlukaniswa nokulungiswa kwesinyithi.Ukulungiswa kwesinyithi, amashishini omkhosi kufuneka abe neemela ezigqwesileyo kunye nokubumba.Phakathi kwezinto ezaziwayo zetsimbi, i-tungsten kuphela inokwenza lo msebenzi obalulekileyo.Indawo yayo yokunyibilika ingaphezulu kwe-3400°C.Intsimbi enqabileyo kakhulu eyaziwayo, enobunzima be-7.5 (ubunzima be-Mohs), yenye yezona zinyithi ezinzima.

Umntu wokuqala ehlabathini ukwazisa i-tungsten kwintsimi yezixhobo zokusika yayiyiBritish Maschette.Kwi-1864, i-Marchet yongezelela i-5% ye-tungsten kwisixhobo sensimbi (oko kukuthi, insimbi yokuvelisa izixhobo zokusika, izixhobo zokulinganisa, kunye nokubumba) okokuqala, kwaye izixhobo ezibangelwayo zonyusa isantya sokusika isinyithi ngama-50%.Ukususela ngoko, isantya sokusika sezixhobo eziqulethe i-tungsten siye sanda ngejometri.Ngokomzekelo, isantya sokusika izixhobo ezenziwe nge-tungsten carbide alloy njengento ephambili inokufikelela ngaphezu kwe-2000 m / min, eyi-267 ngamaxesha ezixhobo ezine-tungsten ngekhulu le-19..Ukongeza kwisantya esiphezulu sokusika, ubulukhuni bezixhobo ze-tungsten carbide alloy abuyi kuncipha nakwiqondo lokushisa eliphezulu le-1000 ℃.Ngoko ke, izixhobo ze-carbide alloy zifanelekile kakhulu ukusika izinto ze-alloy ezinzima umatshini kunye nezinye izixhobo.

Iimolds ezifunekayo ekusebenzeni kwesinyithi zenziwe ikakhulu nge-tungsten carbide ceramic cemented carbide.I-advanteji kukuba iqinile kwaye inokubethelwa ngaphezu kwezigidi ezi-3 zamaxesha, ngelixa i-alloy mold yentsimbi eqhelekileyo inokubethelwa ngamaxesha angaphezu kwama-50,000.Ayisiyiyo loo nto kuphela, i-mold eyenziwe nge-tungsten carbide ceramic cemented carbide ayilula ukuyinxiba, ngoko ke imveliso ephothiweyo ichanekile kakhulu.

Kuya kubonakala ukuba i-tungsten inefuthe eliqinisekileyo kwishishini lokuvelisa izixhobo zelizwe.Ukuba akukho tungsten, kuya kukhokelela ekunciphiseni okukhulu kwimveliso yokuvelisa izixhobo, kwaye kwangaxeshanye, ishishini lokuvelisa izixhobo liya kuba likhubazekile.