Lintho tse Hloahloa

Ke lintho life tse thata haholo?

Thepa e thata haholo ke thepa e nang le boleng ba boima bo fetang 40 gigapascals (GPa) ha e lekantsoe ka tlhahlobo ea boima ba Vickers. Ke lintho tse tiileng tse ke keng tsa qojoa tse nang le sekhahla se phahameng sa elektronike le covalency e phahameng ea bond. Ka lebaka la thepa ea bona e ikhethang, lisebelisoa tsena li na le thahasello e kholo libakeng tse ngata tsa indasteri tse kenyeletsang, empa ha li felle feela, li-abrasives, lisebelisoa tsa polishing le ho itšeha, li-disk brakes, le liphahlo tse sa tsitsang le tse sireletsang.

Mokhoa oa ho fumana lisebelisoa tse ncha tsa superhard

Mothating oa pele, bafuputsi ba etsisa li-carbon bond tse khutšoane tsa daemane ka ho kopanya likarolo tse bobebe joalo ka boron, carbon, nitrogen le oxygen.

Mokhoa oa bobeli o kenyelletsa likarolo tsena tse bobebe (B, C, N, le O), empa hape o hlahisa litšepe tsa phetoho tse nang le li-elektronike tse phahameng tsa valence ho fana ka ho se lumellane ho phahameng. Ka tsela ena, litšepe tse nang le moduli e ngata haholo empa boima bo tlase li hokahanngoa le liathomo tse nyane tse etsang covalent ho hlahisa lisebelisoa tse thata haholo. Tungsten carbide ke ponahatso e amanang le indasteri ea mokhoa ona, leha e sa nkoe e le thata haholo. Ntle le moo, li-boride tse kopantsoeng le litšepe tsa phetoho li fetohile sebaka se ruileng sa lipatlisiso tse thata haholo 'me li lebisitse ho sibollotsoeng joalo ka.ReB2,OsB2, leWB4.

Tlhophiso ea lisebelisoa tse thata haholo

Lisebelisoa tse matla haholo li ka aroloa ka mekhahlelo e 'meli: metsoako ea kahare le metsoako ea kantle. Sehlopha sa ka hare se kenyelletsa daemane, cubic boron nitride (c-BN), carbon nitrides, le metsoako ea ternary e kang B-N-C, e nang le bothata ba tlhaho. Ka lehlakoreng le leng, lisebelisoa tsa kantle ke tse nang le bothata bo boholo le lisebelisoa tse ling tsa mochini tse khethiloeng ke microstructure ea tsona ho fapana le sebopeho. Mohlala oa thepa e tsoang kantle ho naha ke daemane ea nanocrystalline e tsejoang e le aggregated diamond nanorods.

Taemane ke ntho e thata ka ho fetisisa e tsejoang ho fihlela joale, e nang le boima ba Vickers ho tloha 70-150 GPa. Taemane e bonts'a lisebelisoa tse phahameng tsa mocheso le lisebelisoa tsa motlakase, 'me ho hlokometsoe haholo ho fumana lisebelisoa tse sebetsang tsa thepa ena. Thepa ea litaemane tsa tlhaho kapa carbonado e fapana haholo bakeng sa merero ea indasteri, ka hona litaemane tsa maiketsetso li ile tsa fetoha sepheo se seholo sa lipatlisiso.

Taemane ea maiketsetso

Tšimoloho ea khatello e phahameng ea litaemane ka 1953 Sweden le 1954 United States e ile ea khoneha ka nts'etsopele ea lisebelisoa le mekhoa e mecha, e ile ea e-ba mohato oa bohlokoa ka ho fetisisa oa ho kopanya thepa ea maiketsetso e thata haholo. Tšimoloho e bontšitse ka ho hlaka bokhoni ba likopo tsa khatello e phahameng bakeng sa merero ea indasteri le ho susumetsa thahasello e ntseng e eketseha tšimong.

PDC cutter ke mofuta oa thepa e thata haholo e kopanyang daemane ea polycrystalline ka substrate ea tungsten carbide. Taemane ke sesebelisoa sa bohlokoa bakeng sa li-cutters tsa PDC. Hobane litaemane tsa tlhaho li thata ho theha 'me li nka nako e telele, li theko e boima haholo,' me li theko e boima bakeng sa kopo ea indasteri, tabeng ena, Synthetic diamond e phethile karolo e kholo indastering.

Haeba u thahasella lihlahisoa tsa tungsten carbide 'me u batla boitsebiso bo eketsehileng le lintlha tse ling, u ka RE THUTA ka mohala kapa ka poso ka ho le letšehali, kapa RE ROMELA MAIL botlaaseng ba leqephe.