Mareo a motsoako o thata(1)

Ho khothaletsa kutloisiso ea litlaleho le lingoliloeng tsa tekheniki mabapi le alloy e thata, ho tiisa mantsoe, le ho hlalosa moelelo oa mantsoe a tekheniki lingolong, re mona ho ithuta mantsoe a hard alloy.

Tungsten Carbide

Tungsten carbide e bua ka metsoako ea sintered e nang le li-carbide tsa tšepe tse refractory le li-binders tsa tšepe. Har'a li-carbide tsa tšepe tse sebelisoang hona joale, tungsten carbide (WC), titanium carbide (TiC), le tantalum carbide (TaC) ke likarolo tse tloaelehileng haholo. Cobalt tšepe e sebelisoa haholo tlhahisong ea carbide e samente e le setlamo. Bakeng sa lisebelisoa tse khethehileng, li-binders tsa tšepe tse kang nickel (Ni) le tšepe (Fe) li ka sebelisoa hape.

Botenya

Density e bolela karo-karolelano ea boima-ho-bolumo ea thepa, eo hape e bitsoang matla a khoheli a khethehileng. Bophahamo ba eona bo boetse bo na le molumo oa li-pores ka thepa. Tungsten carbide (WC) e na le boima ba 15.7 g/cm³ ha cobalt (Co) e na le boima ba 8.9 g/cm³. Ka hona, ha lihlahisoa tsa cobalt (Co) li le tungsten-cobalt alloys (WC-Co) li fokotseha, boima ba kakaretso bo tla eketseha. Le hoja boima ba titanium carbide (TiC) bo le tlase ho ea tungsten carbide, ke 4.9 g/cm3 feela. Ka likarolo tse itseng tsa lik'hemik'hale tsa thepa, ho eketseha ha li-pores ka thepa ho fella ka ho fokotseha ha sekhahla.

Ho thatafala

Ho thatafala ho bolela bokhoni ba thepa ho hanyetsa deformation ea polasetiki.

Vickers hardness (HV) e sebelisoa haholo machabeng. Mokhoa ona oa ho lekanya boima o bolela boleng ba boima bo fumanoang ka ho sebelisa taemane ho phunyeletsa bokaholimo ba sampuli ho lekanya boholo ba ho indentation tlas'a boemo bo itseng ba mojaro. Rockwell hardness (HRA) ke mokhoa o mong o sebelisoang hangata oa ho lekanya boima. E sebelisa botebo ba ho kenella ha khoune e tloaelehileng ea taemane ho metha ho thatafala. Ka bobeli hardness ea Vickers le Rockwell hardness li ka sebelisoa bakeng sa tekanyo ea boima ba carbide e entsoeng ka samente, 'me tse peli li ka fetoloa hore e be tse ling.

Matla a kobehang

Matla a ho kobeha a boetse a tsejoa e le matla a ho robeha kapa matla a flexural. Li-alloys tse thata li eketsoa e le sefate se bonolo sa tšehetso holim'a li-pivots tse peli, ebe moroalo o sebelisoa ho ea bohareng ba li-pivots ka bobeli ho fihlela motsoako o thata o phatloha. Litekanyetso tse baloang ho tsoa ho foromo e tsoelipanang li sebelisoa bakeng sa mojaro o hlokahalang ho robeha, le sebaka sa sefapano sa sampuli. Ka li-alloys tsa tungsten-cobalt (WC-Co), matla a ho feto-fetoha a eketseha ka cobalt (Co) dikahare ho li-alloys tsa tungsten-cobalt, empa matla a ho feto-fetoha ha maemo a fihla holimo ha litaba tsa cobalt (Co) li fihla hoo e ka bang 15%. Matla a Flexural a lekanyetsoa ka ho lekanya litekanyo tse 'maloa. Boleng bona bo tla fapana ho ea ka geometry ea sampole, boemo ba bokaholimo (boreleli), khatello ea maikutlo ka hare, le mefokolo ea kahare ea thepa. Ka hona, matla a flexural ke tekanyo ea matla feela, 'me litekanyetso tsa matla a flexural li ke ke tsa sebelisoa e le motheo oa khetho ea thepa.

Porosity

Carbide e entsoeng ka samente e hlahisoa ka mokhoa oa phofo oa metallurgy ka ho tobetsa le ho sintering. Ka lebaka la mofuta oa mokhoa ona, ho ka sala palo ea porosity ka har'a sebopeho sa metallurgic ea sehlahisoa.

Ho fokotseha ha porosity ho ka ntlafatsa ka katleho ts'ebetso ea kakaretso ea sehlahisoa. Khatello sintering tshebetso ke mokhoa o atlehang oa ho fokotsa porosity.