Mokhoa oa ho khabisa Tungsten Carbide?

    Lihlahisoa tsa Tungsten Carbide li sebelisoa lits'ebetsong tse ngata, ho kenyelletsa lisebelisoa tsa ho seha, ho cheka, ho phunya, le lits'ebetso tse ling tse ngata. Cemented Carbide e fana ka khanyetso e phahameng ea ho roala le ho lelefatsa bophelo ba lisebelisoa tsena tse fapaneng tsa ho roala le ho itšeha. Hobane karolo ea eona e ka sehloohong ke tungsten, e leng mohloli o sa tloaelehang le o ke keng oa tsosolosoa, theko ea carbide e entsoeng ka samente e batla e phahame. Ho feta moo, carbide e entsoeng ka samente e na le boima bo batlang bo le holimo, 'me matla a eona a ho kobeha a tlase haholo ho feta a litšepe tse ling, joalo ka tšepe. Ka mabaka ana a mabeli, carbide e entsoeng ka samente e tlameha ho hokahanngoa le litšepe tse ling ka litsela tse fapaneng, tse kang ka likhokahano tse entsoeng ka likhoele, li-clamping le welding. Sengoliloeng sena se bua ka mokhoa oa ho tiisa tungsten carbide holim'a litšepe tse ling.

1. Tungsten carbide ke eng?

    Tungsten carbide (WC), eo hape e bitsoang carbide e entsoeng ka samente, ke thepa e kopantsoeng e entsoeng ka mokhoa o bitsoang powder metallurgy. Phofo ea WC e kopantsoe le tšepe e kopanyang, hangata cobalt kapa nickel, e kopantsoeng ka har'a sesebelisoa sa preform, ebe e chesoa ka sebōping. Lentsoe "samente" le bolela likaroloana tsa tungsten carbide tse hapuoeng ka har'a thepa ea tšepe ea tšepe le "samente" hammoho, ho theha maqhama a metallurgical pakeng tsa likaroloana tsa tungsten carbide le binder (WC-Co), ts'ebetsong ea sintering. Indasteri ea carbide e entsoeng ka samente hangata e bua ka thepa ena e le "carbide", leha mantsoe a tungsten carbide le carbide e entsoeng ka samente a sebelisoa ka mokhoa o fapaneng.  Carbide e bonts'a matla a phahameng a hatellang, e hanela ho kheloha, 'me e boloka boleng ba eona ba ho thatafala mochesong o phahameng, thepa ea 'mele e bohlokoa haholo lits'ebetsong tsa ho seha tšepe. 

2 . Lintlha tse peli ho netefatsa katleho ea ho khabisa tungsten carbide

A. Ho laola likhatello tse bakoang ke ho atolosoa ha phapang

B. Likhakanyo tsa ho fokotsa thepa ea motsoali le ho kolobisoa ha carbide ka alloy ea braze

    Nakong ea ho futhumatsa le ho pholile, tšepe ea motheo ea motsoali e tla atoloha 'me e fokotsehe ka tekanyo e phahameng ho feta carbide.  Tungsten carbide e na le sekhahla sa katoloso ea mocheso e ka bang 1/3 ho isa ho 1/2 ea tšepe.  Ha kopano ea brazed e pholile, khatello e setseng e ka 'na ea haha ​​​​ka har'a carbide.  Ho pholile butle-butle ha carbide ho khothalletsoa ho qoba khatello ea maikutlo le ho phatloha ho ka khonehang. Ho tima ha ho kgothaletswe kaha ho ka baka mapetsong a carbides ka lebaka la ho honyela ka potlako ha tšepe ea motheo ea motsoali.

3. Mokhoa oa ho khetha motsoako oa braze

    Tungsten carbide e thata ho koloba. Li-alloys tsa silevera tse nang le litlatsetso tse nyane tsa Nickel (Ni) hangata li sebelisetsoa ho tiisa li-carbides ho tšepe. Ehlile, carbide le tšepe li tlameha ho hloeka e le hore motsoako oa tšepe o qhibilihisitsoeng o ka kolobisa libaka tsa ho nyalana ka botlalo. Ho sila holim'a carbide ho etsa sebaka se hloekileng bakeng sa brazing hoa hlokahala. Ho sila ho boetse ho na le monyetla oa ho batalatsa topography ea carbide, e ka thusang ka ho kolobisa alloy le ho khomarela. Likarolo tsa tšepe, ka mokhoa o tšoanang, li tla hloka ho hloekisoa ho tlosa mafura, oli, litšila kapa litšila tse ling tse setseng.  

    · Li-alloys tsa braze tsa silevera tse fumanehang khoebong tse nang le litlatsetso tse nyane tsa nickel (Ni) le Manganese (Mn) li tla koloba habonolo libaka tsa carbide tse entsoeng ka samente. Li-alloys tsena tsa braze hangata li bonts'a ho kolobisa hantle ha tungsten carbides.  Ho khothaletsoa ho khetha tšepe ea brazing e nang le mocheso o tlase ka ho fetesisa oa brazing ho fokotsa likhatello tse setseng ka har'a lenonyeletso.  

Bakeng sa appliLi-cations tse kenyelletsang ho chesoa ha li-carbide tse kholo, hangata ho sebelisoa sandwich braze alloy.  Haeba li-carbide tse nyane (1/2 inch2) li ke ke tsa sebelisoa, motsoako oa sandwich o molemo ho thibela ho phatloha le warpage ea carbide. Li-trimetals tsena li apesitsoe ka setlapa sa braze se kopantsoeng ka mahlakoreng a mabeli a mantlha a koporo.  

    ·Le hoja boholo ba lipuisano li bile teng ka brazing ea tungsten carbide (WC), re ka be re fositse haeba re sa bue ka polycrystalline diamond kapa PCD. Thempereichara ea brazing bakeng sa PCD hangata e bolokiloe ka tlase ho 1382 ° F (750 ° C) ho qoba ho senyeha ha daemane.  Hangata, baetsi ba maqheka a PCD ho 'mele ea tšepe ba tla sebelisa tšepe e nang le mocheso o tlaase, e phahameng ea silevera, e kang BAg-24 braze alloy.  Baetsi ba bang ba sebelisa alloy ea braze ntle le nickel kapa manganese, joalo ka BAg-5 kapa BAg-7 braze alloy, e nang le mocheso o tlase oa ho qhibiliha le thepa e fokolang ea ho koloba ea carbide le tšepe.

    Ho sebelisoa ha brazing flux ho thibela oxidation ea libaka tse tla kopanngoa nakong ea ho futhumatsa ha kopano.  Flux phofo e sebelisoa le li-alloys tse tloaelehileng tsa silevera.  Phofo e ntšo ea phofshoana e atisa ho khothaletsoa ke baetsi ba braze le flux kaha e na le tlatsetso ea boron 'me e sebetsa hantle ho feta mocheso o phahameng.

    Ho na le li-alloys tse 'maloa tsa brazing tse sebelisetsoang carbide. Ea khale ke BAG-3, 50% silevera e nang le Cadmium.  Sena ke sehlahisoa se setle haholo, empa se na le Cadmium. Hangata e sebelisoang ke BAG-7, 56% silevera e nang le Tin, hobane e koloba habonolo; leha ho le joalo, ke motsoako o fokolang haholo oa brazing, 'me ho hlōleha ha manonyeletso ho tloaelehile ka motsoako ona. Alloy e matla ka ho fetisisa e seng Cadmium ke BAG-22, silevera ea 49% e nang le manganese, empa e batla e le gummy ha e phalla. BAG-24, 50% Silver, ha e na cadmium 'me ke ho sekisetsa.  E phalla hantle empa e batla e fokola ka 40% ho feta BAG-3 le BAG-22.

    Re rata haholo Black Flux, leha ba bangata ba atleha ka katleho ka White Flux. Maemong ana ka bobeli, ho hlakile hore ke mocheso o phahameng oa mocheso. Ho phaella moo, re fumana hore Black Flux e hloekisitsoeng e fana ka phallo e ntle le manonyeletso a matla ho feta Black Flux e tloaelehileng.  

    Sebaka sa ho qetela moo liphoso li atileng ke moralo o kopaneng. Hangata li-welders tse koetlisitsoeng li batla ho kopanya likarolo ebe li tsamaisa sefaha. Ha li chesa, li batla ho kopanya likarolo ebe li kopanya motsoako oa brazing ka har'a motsoako.   

    Ha brazing carbide, hangata ho sebetsa haholo ho feta ho phalla mahlakoreng le tlase ea notch, ebe o kenya likotoana tsa terata ea alloy tlas'a carbide.  Sohle seo u se etsang ke mocheso ho fihlela carbide e lula sebakeng.   

    Tekanyetso e lokela ho ba hore carbide e phatloha kapa tšepe e phunyeha pele lenonyeletso le hlōleha.